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| An improved arc-length method for searching pre-defined displacement in nonlinear analysis of structures |
| Revised:June 01, 2005 |
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| DOI：10.7511/jslx20074099 |
| KeyWord:nonlinear analysis,pre-defined displacement,improved arc-length method |
| SONG Zhen-sen SHE Zu-yan LUO Yong-feng |
| 1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China, 2. Department of Building Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: |
| Arc-length method is widely employed in nonlinear FEM analysis because it is efficient and robust for solving the nonlinear formulation,especially for the problem of Snap-through and Snap-back.But it is rather difficult to converge to a specified displacement level with this method.Based on the concept of generalized arc-length,an improved arc-length method is presented to converge to pre-defined displacement.The improved method can be used to search and determine the pre-defined displacement levels besides tracing the whole nonlinear equilibrium path of a structure.Numerical experiment shows that the new method is accurate,efficient and reliable. |
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