Abstract
Progressive collapse is a persistent spread and enlargement of initial local failure of structures characterized by inconsistency between the initial failure and its resulting extensive collapse. Although, great contributions have been made towards the progressive collapse of building structures, comparably small attention has been paid to bridge structures. In this study, the procedure of progressive collapse of bridges with concrete prestressed voided slab under earthquakes and effects of other parameters on propagation of collapse of regular, semiregular, and irregular bridges are investigated. At first, a bridge specimen, which its shake table test results were provided by previous researchers, was modeled and verified using the applied element method. Then, the progressive collapse of the box girder bridge was investigated. In the next step, progressive collapse process of the same bridge with posttensioned voided slab under earthquakes was studied using nonlinear time history analysis. Irregularities of the piers were analyzed parametrically. The results show that domino‐type progressive collapse happens in bridges with voided slab after the initial failure of the deck at the seating of bridge abutment. Also, it is concluded that, type of the deck, height of the piers, and ground slope have a great effect on the progressive collapse procedure of both regular and irregular bridges with voided slab deck.
Highlights
Since the World Trade Center towers attack (Incident New York, 2001), progressive collapse has been considered by many researchers [1]
Research studies conducted on progressive collapse of structures have usually focused on buildings under blast or abnormal loads, and only few studies have been conducted to investigate the vulnerability of bridges to progressive collapse induced by earthquakes, while bridge collapse usually results in huge casualties and financial losses [3]
After modeling the entire bridge with given details and materials, the results of nonlinear dynamic analysis by applied element method, were compared with previous research studies under first part of the record of an artificial ground motion (Figure 7) where the PGA is equal to 0.875 g and the duration is equal to 4 s
Summary
Since the World Trade Center towers attack (Incident New York, 2001), progressive collapse has been considered by many researchers [1]. Lau and Wibowo utilized AEM to model and analyze the bridge at the same scale by considering linear and nonlinear deck behaviors. E purpose is to investigate the progressive collapse procedure of regular, semiregular, and irregular bridges with concrete posttensioned voided slab deck under earthquakes. Modeling the process of progressive collapse such as the failure of elements, separation, collision of elements with each other, and elements falling on the ground is very difficult and nonfunctional in the finite element method. Analyzing this process is very simple and operational considering the solution
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