Abstract
The cable-stayed bridge with diamond-shaped pylons is one of the most popular bridges because of its obvious advantages such as aesthetical appearance and smaller foundation. However, the diamond-shaped pylons have both inward and outward inclinations, which may result in complicated seismic behavior when subjected to lateral earthquake excitations. To end this, the finite element model of a cable-stayed bridge with diamond concrete pylon is developed firstly. Four limit states and corresponding damage index are defined for each critical section. Finally, the lateral seismic fragility of the components and system of CSB was carried out. Based on the result of probabilistic estimation of lateral seismic responses, the order of the damage probability in all four damage states for each component of bridge is given. The fragility curves of bridge system on the lower bound and upper bound are studied. Moreover, the system fragility of the entire bridge is compared with that of each component.
Highlights
Cable-stayed bridge is featured by its appealing aesthetics, large spanning capacity, and excellent economic performance, which has been widely constructed around the world in the last several decades [1, 2]. e pylon is the most important component of the CSB system [3]
Previous studies on lateral seismic response of CSBs are mostly based on nonlinear time-history analysis or shaking table tests subjected to certain earthquakes
Since the computational effort of the probabilistic seismic demand analysis method is less than the frequency statistics analysis method, the probabilistic seismic demand models based on the incremental dynamic analysis (IDA) method are adopted to develop the analytical fragility curves of the case study cable-stayed bridge in this study. e analysis procedures of this method are as follows: (1) Step 1
Summary
Cable-stayed bridge is featured by its appealing aesthetics, large spanning capacity, and excellent economic performance, which has been widely constructed around the world in the last several decades [1, 2]. e pylon is the most important component of the CSB system [3]. Shaking table tests were conducted to study the seismic response and potential failure mode of pylons of the bridge full-model under transverse earthquake excitation. Wang et al [19] assessed the transverse seismic failure mechanism and ductile properties of typical inverted Y-shape RC pylons for long-span cable-stayed bridges using quasistatic model tests and numerical analyses. Wang et al [20, 21] conducted a/20-scale full bridge model from a typical medium-span cable-stayed bridge to study the potential plastic region and possible failure mode of the concrete H-shaped pylon subjected to the transverse excitations. Previous studies on lateral seismic response of CSBs are mostly based on nonlinear time-history analysis or shaking table tests subjected to certain earthquakes.
Sign-in/Register to view highlights & summary 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 callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
