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An Investigation on the Pushover Analysis Based Methods for Compensating the P-Delta Effects

Parsa Heydarpour 1, Pedro F. Silva 1, and Rigoberto Burgueño 2
1. Department of Civil and Environmental Engineering The George Washington University Washington, DC, USA
2. Department of Civil and Environmental Engineering Michigan State University East Lansing, MI, USA
Abstract—Nonlinear Static Analysis (NSA) is currently considered as one of the most commonly used methods to estimate capacity of structural components. It is relatively simple and computationally inexpensive to generate the force-displacement graph using pushover analysis, and unlike nonlinear dynamic analysis the obtained results can easily be interpreted. NSA has been the basis for multiple methods for designing columns with consideration of P-Delta effects. A precise solution for stability problem under dynamic loading requires consideration of the randomness of ground motions and material uncertainties. Static procedures such as NSA ignores the fact that characteristics of the ground motions such as intensity, frequency content, and duration varies from one earthquake record to the other. On the other hand, most engineering firms are reluctant to perform complex nonlinear time-history analysis due to its high computational cost and other inherent complexities. Among different methods which redesign columns for P-Delta effects using pushover analysis two methods which use same energy under force-displacement diagram and same effective stiffness at target ductility have been studied here. Caltrans SDC target ductility for single column bents supported on fixed foundation is considered as the design target. The main objective of this research is to identify the applicability regions of these two methods for designing RC bridge columns in order to compensate for P-Delta effects.
 
Index Terms—Pushover analysis, P-Delta effects, RC bridge column design, Nonlinear Static Analysis, Incremental Dynamic Analysis

Cite: Parsa Heydarpour, Pedro F. Silva, and Rigoberto Burgueño, "An Investigation on the Pushover Analysis Based Methods for Compensating the P-Delta Effects," International Journal of Structural and Civil Engineering Research, Vol. 7, No. 1, pp. 34-39, February 2018. doi: 10.18178/ijscer.7.1.34-39
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