After running CHECK, a list of errors and warnings may be displayed. The CHECK in the ACS-SASSI User Interface should produce similar output to prep however the error file now has headers that show which module the errors and warning are associated with. The AFWRITE instruction will first execute the CHECK instruction. Any module that does not pass CHECK will not have the associated module input written.

Error 1: Illegal Acceleration of Gravity

• The acceleration of gravity has a negative or zero value.
• Set the analysis options by selecting the Options / Analysis command.

Error 2: Illegal Node for Symmetry Plane/Line <i>

• The symmetry plane / line <i> has a node either with illegal number or the node was not defined.
• Redefine the node for the symmetry plane/line.

Error 3: Illegal Number of Nodes for Symmetry Plane/Line <i>

• The symmetry plane / line <i> has only one node.
• Redefine the nodes for the symmetry plane/line .

Error 4: Nodes from Symmetry Line <i> Are Equal

• The nodes from symmetry line <i> are the same or have the same coordinates.
• Redefine the nodes for the symmetry plane/line.

Error 5: Nodes from Symmetry Plane <i> Are Collinear

• The nodes from symmetry plane <i> are collinear.
• Redefine the nodes for the symmetry plane/line.

Error 6: Undefined Element <e>, Group <g>

• Your model has a gap in group <g>, element <e>.
• Define element <e> from group <g> or compress the elements by using the ECOMPR instruction.

Error 7: Element <e> from Group <g> Has Too Few Nodes

• Element <e> from group <g> from your model has too few nodes compared with the nodes number of the group type.
• Define all nodes or change the group type.

See also: GROUP instruction.

Error 8: Element <e>, Group <g> Has 0 Length

• This error occurs for two-node elements which nodes are the same or have the same coordinates.
• Check both node numbers, and the coordinates of both nodes.

Error 9: Nodes from Element <e>, Group <g> Are Collinear

• This error occurs for three-node or four-node elements in which the nodes are the same, have the same coordinates, or are collinear.
• Check all node numbers and the coordinates of all nodes for the specified element.

Error 10: Element <e>, Group <g> Has Improper Release Code

• This error occurs when a component of I end release code is set to 1 and the corresponding component of the J end release code is also set to 1.
• Check I and J end release codes and modify one of them with the KI or KJ instructions.

Error 11: Zero Area for Element <e>, Group <g>

• This error occurs for four-node elements when some of the nodes are collinear or the same.
• Check all four nodes an their coordinates.

Error 12: Warped Element <e>, Group <g>

This error occurs for four-node elements when not all four nodes are in the same plane. Check all four nodes and their coordinates.

Error 13: Material <m> Is not Defined

• One of the model's elements uses material <m> which is not defined.
• Check the elements for material / soil layer indices, check element type, or define material <m>.

Error 14: Elasticity Modulus from Material <m> Is Illegal

• The elasticity modulus from material <m> has a negative or zero value.
• Correct the elasticity modulus from the specified material.

Error 15: Poisson Coefficient from Material <m> Is Illegal

• The Poisson coefficient from material <m> has a negative or zero value.
• Correct the Poisson coefficient from the specified material.

Error 16: Specific Weight from Material <m> Is Illegal

• The specific weight from material <m> has a negative value.
• Correct the specific weight from the specified material.

Error 17: P-Wave Damping Ratio from Material <m> Is Illegal

• The P-wave damping ratio from material <m> has a negative value.
• Correct the P-wave damping ratio from the specified material.

Error 18: S-Wave Damping Ratio from Material <m> Is Illegal

• The S-wave damping ratio from material <m> has a negative value.
• Correct the S-wave damping ratio from the specified material.

Error 19: Soil Layer <l> Is not Defined

• One of the model's elements uses soil layer <l> which is not defined.
• Check the elements for material / soil layer indices, check element type, or define soil layer <l>

Error 20: Thickness from Soil Layer <l> Is Illegal

• The thickness from soil layer <l> has a negative or zero value.
• Correct the thickness from the specified soil layer.

Error 21: Specific Weight from Soil Layer <l> Is Illegal

• The specific weight from soil layer <l> has a negative value.
• Correct the specific weight from the specified soil layer.

Error 22: P-Wave Velocity from Soil Layer <l> Is Illegal

• The P-wave velocity from soil layer <l> has a negative value.
• Correct the P-wave velocity from the specified soil layer.

Error 23: S-Wave Velocity from Soil Layer <l> Is Illegal

• The S-wave velocity from soil layer <l> has a negative value.
• Correct the S-wave velocity from the specified soil layer.

Error 24: P-Wave Damping Ratio from Soil Layer <l> Is Illegal

• The P-wave damping ratio from soil layer <l> has a negative value.
• Correct the P-wave damping ratio from the specified soil layer.

Error 25: S-Wave Damping Ratio from Soil Layer <l> Is Illegal

• The S-wave damping ratio from soil layer <l> has a negative value.
• Correct the S-wave damping ratio from the specified soil layer.

Error 26: Property <p> Is not Defined

• One of the model's BEAMS elements uses property <p> which is not defined.
• Check the elements for property indices or define property <p>.

Error 27: Axial Area from Property <p> Is Illegal

• The axial area from property <p> is less than or equal to 0.
• Correct the area from the specified property.

Error 28: Shear Area 2 from Property <p> Is Illegal

• The shear area 2 from property <p> has a negative value.
• Correct the shear area 2 from the specified property.

Error 29: Shear Area 3 from Property <p> Is Illegal

• The shear area 3 from property <p> has a negative value.
• Correct the shear area 3 from the specified property.

Error 30: Torsion Inertia Moment from Property <p> Is Illegal

• The torsion inertia moment from property <p> has a negative or zero value.
• Correct the torsion inertia moment from the specified property.

Error 31: Flexural Inertia Moment 2 from Property <p> Is Illegal

• The flexural inertia moment 2 from property <p> has a negative value.
• Correct the flexural inertia moment 2 from the specified property.

Error 32: Flexural Inertia Moment 3 from Property <p> Is Illegal

• The flexural inertia moment 3 from property <p> has a negative value.
• Correct the flexural inertia moment 3 from the specified property.

Error 33: Spring Property <p> Is not Defined

• One of the model's SPRING elements uses spring property <p> which is not defined.
• Check the elements for property indices or define spring property <p>. (instruction SC)

Error 34: Spring Constant X from Spring Property <p> Is Illegal

• The spring constant x from spring property <p> has a negative value.
• Correct spring constant x from the specified spring property .

Error 35: Spring Constant Y from Spring Property <p> Is Illegal

• The spring constant y from spring property <p> has a negative value.
• Correct spring constant y from the specified spring property .

Error 36: Spring Constant Z from Spring Property <p> Is Illegal

• The spring constant z from spring property <p> has a negative value.
• Correct spring constant z from the specified spring property .

Error 37: Spring Constant XX from Spring Property <p> Is Illegal

• The spring constant xx from spring property <p> has a negative value.
• Correct spring constant xx from the specified spring property .

Error 38: Spring Constant YY from Spring Property <p> Is Illegal

• The spring constant yy from spring property <p> has a negative value.
• Correct spring constant yy from the specified spring property.

Error 39: Spring Constant ZZ from Spring Property <p> Is Illegal

• The spring constant zz from spring property <p> has a negative value.
• Correct spring constant zz from the specified spring property.

Error 40: Mass out of Defined Nodes Range

• Check found masses that exceed the defined nodes range.
• Define more nodes or delete the masses. (instructions MTDEL and MRDEL)

Error 41: Node <n> Is Not Defined - Group <g> Element <e>

• Element <e> from group <g> uses node <n> which is not defined.
• Check the element for node errors or define node <n>.

Error 42: No Nodes Defined

• Your model has no nodes.
• This is a fatal error. Check has stopped after this message. You cannot check a model without nodes.

Error 43: No Groups Defined

• Your model has no groups.
• This is a fatal error. Check has stopped after this message. You cannot check a model without groups.

Error 44: Frequency Set <s> Is Not Defined

• The frequency set specified in the analysis options is not defined.
• Check the analysis options or define the frequency set.

Error 45: Mode 1 and Mode 2 Are Both Deselected

• The mode 1 and mode 2 options for the SITE module are both deselected.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 46: No Top Layers

• The top layers list for the SITE module is empty.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 47: Illegal Number of Layers for Halfspace Simulation

• The number of layers for halfspace simulation must either be zero or lie between 4 and 20.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 48: Illegal Frequency Step

• The frequency step has a negative value.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 49: Illegal Time Step of Control Motion

• The time step has a negative value.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 50: Illegal Number of Values for Fourier Transform

• The number of values for Fourier Transform has a negative value.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 51: All Wave Fields Are Deselected

• All wave field options are deselected.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 52: Illegal Incident Angle of Wave <w>

• The incident angle of wave <w> is not in the range (0,360) degrees.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 53: Illegal Value for Frequency <i>

• The value for frequency <i> of ratio curve is less than or equal to zero.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 54: Illegal Value for Wave <w> Ratio at Frequency <i>

• The value for the wave ratio at frequency <i> is less than or equal to zero or is greater than 1.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 55: Illegal Sum of Wave Ratios at Frequency <i>

• The sum of the wave ratios for selected wave types at frequency <i> is not 1.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 56: Illegal Last Layer Number in Near Field Zone

• The last layer number has a negative value.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 57: Illegal Radius of Central Zone

• The radius of the central zone has a zero or negative value.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 58: Illegal Coherence Parameter

• The coherence parameter must be greater than or equal to 0.1.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 59: Illegal Mean Soil Shear Wave Velocity

The mean soil shear wave velocity is less than or equal to zero. Set the analysis parameters by selecting the Options / Analysis command.

Error 60: Illegal Number of Mesh Points / Embedment Level

• The number of mesh points is negative or zero.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 61: No Forces Defined

• Your model has no forces or moments for the FORCE module.
• Define a set of forces or moments using the F or MM instructions.

Error 62: Node for Force / Moment <i> is not defined

• Your model has a force / moment on an undefined node.
• Define the node using the N instruction or delete the force / moment using the FDEL or MMDEL instructions.

Error 63: Illegal Coordinate Transformation Angle

• The coordinate transformation angle is not in the range (0,360) degrees.
• Set the analysis parameters by selecting the Options / Analysis command.

Error 64: No Nodal Output Request

• There are no node lists for output defined.
• Add some node lists by selecting the Options / Analysis command.

Error 65: Illegal Nodal Output Request: <n>

• One of the defined node lists for output requests contains the illegal node number <n>, explicitly or contained in a range.
• Correct the node list by selecting the Options / Analysis command.

Error 66: Nodal Output Request Defined More Than Once: <n>

• The defined node lists for output requests contain the node number <n> more than once, explicitly or contained in a range.
• Correct the node lists by selecting the Options / Analysis command.

Error 67: Illegal Output Time History Step

• The output time history step has a negative value.
• Correct output time history step by selecting the Options / Analysis command.

Error 68: Illegal Total Duration To Be Plotted

• The total duration to be plotted has a negative value.
• Correct total duration to be plotted by selecting the Options / Analysis command.

Error 69: Illegal First Frequency for RS Analysis

• The first frequency for RS analysis has a negative value.
• Correct first frequency for RS analysis by selecting the Options / Analysis command.

Error 70: Illegal Last Frequency for RS Analysis

• The last frequency for RS analysis has a negative value.
• Correct last frequency for RS analysis by selecting the Options / Analysis command.

Error 71: Illegal Number of Frequency Steps For RS Analysis

• The number of frequency steps for RS analysis has a negative value.
• Correct number of frequency steps for RS analysis by selecting the Options / Analysis command.

Error 72: Illegal Damping Ratio For RS Analysis

• One of the damping ratios from the damping ratio list has a value that is not between 0 and 1.
• Correct damping ratio for RS analysis by selecting the Options / Analysis command.

Error 73: Acceleration Time History File Does Not Exist

• The acceleration time history file does not exist or is misspelled.
• Correct the acceleration time history file by selecting the Options / Analysis command.

Error 74: Illegal First Record Number

• The first record number for the acceleration time history file has a negative value or is greater than the number of records in the file.
• Correct the first record number by selecting the Options / Analysis command.

Error 75: Illegal Last Record Number

• The last record number for the acceleration time history file has a negative value.
• Correct the last record number by selecting the Options / Analysis command.

Error 76: First Record Number Larger Than Last Record Number

• The first record number for the acceleration time history file is larger than the last record number.
• Correct the record numbers by selecting the Options / Analysis command.

Error 77: Multiplication Factor and Maximum Value Of Time History Are Both Zero

• The multiplication factor and maximum value used to scale the acceleration time history file are both zero.
• Correct the multiplication factor or maximum value by selecting the Options / Analysis command.

Error 78: Multiplication Factor and Maximum Value Of Time History Are Both Non-Zero

• The multiplication factor and maximum value used to scale the acceleration time history file are both non-zero.
• Correct the multiplication factor or maximum value by selecting the Options / Analysis command.

Error 79: No Element Output Request

• There are no element lists for output defined.
• Add some element lists by selecting the Options / Analysis command.

Error 80: Illegal Group For Output Request: <g>

• One of the defined element lists for output requests are set to the illegal group number <g>.
• Correct the element list by selecting the Options / Analysis command.

Error 81: Illegal Element Output Request: <e>, Group <g>

• One of the defined element lists for output requests set to group number <g> contains the illegal element number <e>,explicitly or contained in a range.
• Correct the element list by selecting the Options / Analysis command.

Error 82: Element Output Request Defined More Than Once: <e>, Group <g>

• The defined element lists for output requests contain the element number <e> of group <g> more than once, explicitly or contained in a range.
• Correct the element lists by selecting the Options / Analysis command.

Error 83: Matrix Property <p> Is not Defined

• One of the model's GENERAL elements uses matrix property <p> which is not defined.
• Check the elements for property indices or define matrix property <p>. (see instructions MXR, MXI, and MXM)

Error 84: No RS Input Files Specified

• All three spectrum input files for ACS SASSI EQUAKE module are left blank.
• Set at least one spectrum input file by selecting the Options / Analysis command.

Error 85: RS Input File <i> Does Not Exist

• The spectrum input file <i> for ACS SASSI EQUAKE module does not exist.
• Set the spectrum input file <i> by selecting the Options / Analysis command.

Error 86: Invalid RS Output File <i>

• The spectrum output file <i> for ACS SASSI EQUAKE module is left blank.
• Set the spectrum output file <i> by selecting the Options / Analysis command.

Error 87: Invalid Acceleration Output File <i>

• The acceleration output file <i> for ACS SASSI EQUAKE module is left blank.
• Set the acceleration output file <i> by selecting the Options / Analysis command.

Error 88: Invalid Acceleration Input File <i>

• The acceleration input file <i> for ACS SASSI EQUAKE module is left blank.
• Set the acceleration output file <i> or deselect the acceleration input option by selecting the Options / Analysis command.

Error 89: Number of Frequencies Does Not Match RS Input File <i>

• The number of records from the spectrum input file <i> for ACS SASSI EQUAKE module is not equal to the number of frequencies.
• Change the number of frequencies or change the spectrum input file <i> by selecting the Options / Analysis command.

Error 90: Illegal Initial Random Number

• The initial random number for ACS SASSI EQUAKE module is less or equal to zero.
• Correct the initial random number by selecting the Options / Analysis command.

Error 91: Illegal Number of Frequencies

• The number of frequencies for ACS SASSI EQUAKE module is less or equal to zero.
• Correct the number of frequencies by selecting the Options / Analysis command.

Error 92: Illegal Duration

• The total duration for ACS SASSI EQUAKE module is less or equal to zero.
• Correct the total duration by selecting the Options / Analysis command.

Error 93: No Correlation Factors Defined

• The correlation factors for ACS SASSI EQUAKE module are not defined.
• Define the correlation factors or deselect the correlation option by selecting the Options / Analysis command.

Error 94: Illegal Correlation Factor

• One of the correlation factors for ACS SASSI EQUAKE module is greater than 1.
• Correct the correlation factor by selecting the Options / Analysis command.

Error 95: No Dynamic Soil Properties Assigned

• No dynamic soil properties were assigned to sublayers for ACS SASSI SOIL module.
• Set the dynamic soil properties by selecting the Options / Analysis command.

Error 96: Too Many Dynamic Soil Properties

• The sublayers for ACS SASSI SOIL module use more than 15 dynamic soil properties.
• Change the dynamic soil properties by selecting the Options / Analysis command.

Error 97: Dynamic property <p> has no shear modulus curve

• The dynamic soil property <p> has no data defining the shear modulus - shear strain curve.
• Define the shear modulus - shear strain curve for the dynamic soil property by selecting the Options / Analysis command.

Error 98: Dynamic property <p> has illegal shear modulus values

• One of the shear modulus values defining the dynamic soil property <p> is less than zero or greater than 1.
• Correct the shear modulus for the dynamic soil property by selecting the Options / Analysis command.

Error 99: Dynamic property <p> has no damping curve

• The dynamic soil property <p> has no data defining the damping ratio - shear strain curve.
• Define the damping ratio - shear strain curve for the dynamic soil property by selecting the Options / Analysis command.

Error 100: Number of Acceleration Values Is Illegal

• The number of acceleration values for ACS SASSI SOIL module is less than or equal to zero.
• Correct the number of acceleration values by selecting the Options / Analysis command.

Error 101: Cut-Off Frequency Is Illegal

• The cut-off frequency for ACS SASSI SOIL module is less than zero.
• Correct the cut-off frequency by selecting the Options / Analysis command.

Error 102: Illegal Reading Format

• The reading format for ACS SASSI SOIL module is illegal.
• Correct the reading format by selecting the Options / Analysis command.

Error 103: Illegal Number of Header Lines

• The number of header lines for ACS SASSI SOIL module is less than zero.
• Correct the number of header lines by selecting the Options / Analysis command.

Error 104: Illegal Control Layer Number

• The control layer number for ACS SASSI SOIL module is illegal.
• Correct the control layer number by selecting the Options / Analysis command.

Error 105: Illegal Number of Iterations

• The number of iterations for ACS SASSI SOIL module is less than zero.
• Correct the number of iterations by selecting the Options / Analysis command.

Error 106: Illegal Strain Ratio

• The strain ratio for ACS SASSI SOIL module is not between 0 and 1.
• Correct the strain ratio by selecting the Options / Analysis command.

Error 107: No Damping Ratios Defined

• There are no defined damping ratios for ACS SASSI SOIL.
• Define the damping ratios by selecting the Options / Analysis command.

Error 108: Illegal Multiplier for Acceleration of Gravity

• The multiplier for the acceleration of gravity for ACS SASSI SOIL module is less than or equal to 0.
• Correct the multiplier for the acceleration of gravity by selecting the Options / Analysis command.

Error 109: Illegal Second Layer Number for Layer <i>

• The second layer number for layer <i> for ACS SASSI SOIL module is illegal.
• Correct the second layer number by selecting the Options / Analysis command.

Error 110: Illegal Frequency Step for Layer <i>

• The frequency step for layer <i> for ACS SASSI SOIL module is less than or equal to zero.
• Correct the frequency step by selecting the Options / Analysis command.

Error 111: Illegal Number of Smoothings for Layer <i>

• The number of times the spectrum is to be smoothed for layer <i> for ACS SASSI SOIL module is less than zero.
• Correct the number of smoothings by selecting the Options / Analysis command.

Error 112: Illegal Number of Values to Be Saved for Layer <i>

• The number of values to be saved for layer <i> for ACS SASSI SOIL module is less than zero.
• Correct the number of values to be saved by selecting the Options / Analysis command.

Error 113: Illegal Apparent Velocity for Line D

• The apparent velocity for line D is less than or equal to zero.
• Correct the apparent velocity for line D by selecting the Options / Analysis command.

Error 114: Illegal Directional Coherence Factor

• The directional coherence factor is less than zero.
• Correct the directional coherence factor by selecting the Options / Analysis command.

Error 115: No Multiple Excitation Data Defined

• The multiple excitation option is selected, but no data is defined.
• Define multiple excitation data or deselect the option by selecting the Options / Analysis command.

Error 116: Illegal First Node Number for Motion <i>

• The first node number for motion <i> is illegal.
• Correct the first node number by selecting the Options / Analysis command.

Error 117: Illegal Last Node Number for Motion <i>

• The last node number for motion <i> is illegal.
• Correct the last node number by selecting the Options / Analysis command.

Error 118: Illegal Spectral Amplification Ratio for Motion <i>

• One of the spectral amplification factors is not between 0 and 10.
• Correct the spectral amplification factor by selecting the Options / Analysis command.

Error 119: Spectral Amplification Ratios for Motion <i> Do Not Match Frequencies

• The number of spectral amplification ratios must be equal to the number of frequencies from the selected frequency set.
• Correct the spectral amplification ratios or the frequency set by selecting the Options / Analysis command.

Error 120: Frequency set <i> is Empty. Change the active frequency set in the SITE tab of the Analysis Options

• The Frequency set for relative displacement is empty the user can change the set by going to the site menu in analysis option
• The user can add frequencies to the set by using the FREQ command

Error 121: No Panels Specified

• The user attempted to use the panel module without defining any panels
• The user can use the P command to defined a panel

Error 122: Material <i> referenced in panel <k> does not exist

• A material in a panel definition does not exist.
• The user can change the panel to use a material that does exist by using the P command.
• The user can add a material that uses reference number <i> using the M command.

Error 123: Group <i> referenced in panel <k> does not exist

• A group in a panel definition does not exist.
• The user can change the panel to use a group that does exist by using the P command.
• The user can add a group that uses reference number <i> using the GROUP command.

Error 124: Node <i> is a fixed interaction node

• Node <i> is fully fixed and an interaction node.
• The user can change the interaction status of the node <i> using the INT command.
• The user can change the fixed status of the node <i> using the D command.

Warning 1: Gap Found at Node <n>

Check found a gap at node <n>. You can define node <n> with fixed DOF, or AFWRITE will generate it automatically (only in the analysis files, not in the model) with fixed DOF.

Warning 2: Distorted Element <e>, Group <g>, Face <f>

This message occurs for SHELL, PLANE, or LOVEWAVE elements with four or three nodes, when the smallest angle is too small in comparison with the greatest angle. All faces are checked for SOLID elements. This is not an error, but you can get bad results from the analysis program.

Warning 3: Warped Element <e>, Group <g>

This message occurs for four-nodes SHELL, PLANE, or LOVEWAVE elements when the four nodes are not quite on the same plane.

Warning 4: Unused Node <n>

Check found node <n> that is not used in any element (except K-nodes from BEAMS elements). You can set the node to fixed DOF, or AFWRITE will set the fixed DOF automatically in the analysis files, not in the model.

Warning 5: Translational Mass in Node <n> Is on Fixed DOF

You defined a translational mass that corresponds to the node <n>, which has fixed DOF. This is not an error, but the analysis program will not take that mass into account.

Warning 6: Rotational Mass in Node <n> Is on Fixed DOF

You defined a rotational mass that corresponds to the node <n>, which has fixed DOF. This is not an error, but the analysis program will not take that mass into account.

Warning 7: Group <g> Has no Elements

Check found group <g> with no elements. This is not an error, AFWRITE will skip this group when writing the analysis file.

Warning 8: Too Many Top Layers

The top layer list from module SITE has more than 100 soil layers. Only the first 100 are written.

Warning 9: Number of Values for Fourier Transform Is Not Power of 2

The number of values for Fourier transform must be a power of 2. ACS SASSI PREP writes the nearest power of 2 to the analysis files.

Warning 10: Force in Node <n> Is on Fixed DOF

You defined a force that corresponds to the node <n>, which has fixed DOF . This is not an error, but the analysis program will not take that force into account.

Warning 11: Moment in Node <n> Is on Fixed DOF

You defined a moment that corresponds to the node <n>, which has fixed DOF This is not an error, but the analysis program will not take that moment into account.