Abstract
This paper presents a new adaptive pushover procedure to account for the effect of higher modes in order to accurately estimate the seismic response of bridges. The effect of higher modes is considered by introducing a minimum value for the total effective modal mass. The proposed method employs enough number of modes to ensure that the defined total effective modal mass participates in all increments of the pushover loading. An adaptive demand curve is also developed for assessment of the seismic demand. The efficiency and robustness of the proposed method are demonstrated by conducting a parametric study. The analysis includes 18 four-span integral bridges with various heights of piers. The inelastic response history analysis is employed as reference solution in this study. Numerical results indicate excellent accuracy of the proposed method in assessment of the seismic response. For most bridges investigated in this study, the difference between the estimated response of the proposed method and the inelastic response history analysis is less than 25% for displacements and 10% for internal forces. This indicates a very good accuracy compared to available pushover procedures in the literature. The proposed method is therefore recommended to be applied to the seismic performance evaluation of integral bridges for engineering applications.
Highlights
Over the past two decades, there has been an increasing attention to Nonlinear Static Procedures (NSPs) for the seismic assessment and evaluation of bridges
The main contribution of this paper is to present a refined multimode adaptive capacity spectrum approach in order to enhance the accuracy and reliability of NSPs in the seismic assessment of bridges
An efficient nonlinear static procedure for the seismic assessment of integral bridges has been presented in this paper
Summary
Over the past two decades, there has been an increasing attention to Nonlinear Static Procedures (NSPs) for the seismic assessment and evaluation of bridges. In these methods, a pushover analysis is carried out to estimate the inelastic capacity of the structure as well as its response to different levels of the seismic demand. The NSPs have the simplicity of the linear static methods and the accuracy of the nonlinear dynamic analyses They have become standard tools for the analysis of bridges in many seismic codes and guidelines such as EC8-2 [1] and Caltrans [2]. The application of NSPs should be modified and adjusted for bridges
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
