![]() ![]() After setting desired values, click on the OK button to apply limits.Note that the unit for compression limit is kip which is 1000 pound-force. Select the Compression Limit check box to specify compression limit in selected frame members and specify the value in adjacent edit box.Note that the unit for tension limit is kip which is 1000 pound-force. Select the Tension Limit check box to specify tension limit in selected frame members and specify the value in adjacent edit box.The Frame Assignment-Tension/Compression Limits dialog box will be displayed refer to Figure-21. After selecting the frame members, click on the Tension/Compression Limits tool from the Frame cascading menu of the Assign menu.The procedure to assign tension/compression limits is given next. These options are used primarily to model tension-only cables and braces or compression only beams. Further, response-spectrum loads cannot be converted to nonlinear cases.The tension and compression limits are the maximum allowed tension and compression stresses on the selected frame members. Please note that response-spectrum analysis only applies to linear systems. For design, you can select the created nonlinear combination as design load combinations.Add the nonlinear case(s) to a user-defined combination with a scale factor of 1.0.In order to simulate with detail the joints, you can modify the property modifiers of the elements close to the joint only. Model the wall with shell elements roughly. Select the case(s) through Define > Convert Combos to Nonlinear Cases johnbridge231 (Civil/Environmental) 25 Aug 13 05:17. ![]() See below on how to convert any load case or combination to nonlinear.Īny load case or combination may be converted to a nonlinear analysis as follows: Compression same thing, you can choose positive or negative, just make. This is necessary since tension-only assignment is a nonlinear feature. For beams we consider tension as positive and compression negative while for. Define and Run a nonlinear static or nonlinear time-history analysis.Specify the tension limit (usually a limit higher than expected maximum tension capacity) and a compression limit of zero (or negative) through Assign > Frame/Line > Tension/Compression Limits.Select the elements to be specified as tension-only.Tension-only elements can be modeled using all versions of ETABS. ![]()
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