Dynamic Response and Robustness Evaluation of Cable-Supported Arch Bridges Subjected to Cable Breaking

Guotao Shao,Yue Xu,Hui Jin,Ruinian Jiang,Salvatore Caddemi

doi:10.1155/2021/6689630

Guotao Shao, Yue Xu + Show 3 more

Open Access

https://doi.org/10.1155/2021/6689630

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Abstract

Cable-supported arch bridges have had many cable break accidents, which led to dramatic deck damage and even progressive collapse. To investigate the dynamic response and robustness of cable-supported arch bridges subjected to cable breaking, numerical simulation methods were developed, compared, and analyzed, and an effective and accurate simulation method was presented. Then, the cable fracture of a prototype bridge was simulated, and the dynamic response of the cable system, deck, and arch rib was illustrated. Finally, the robustness evaluation indexes of the cable system, deck, and arch rib were constructed, and their robustness was evaluated. The results show that the dynamic response of the adjacent cables is proportional to the length of the broken cable, while the dynamic response of the deck is inversely proportional to the length of the broken cable. The dynamic amplification factor of the cable tension and deck displacement is within 2.0, while that of the arch rib bending moment exceeds 2.0. The break of a single cable will not trigger progressive collapse. When subjected to cable breaking, the deck system has the least robustness. The proposed cable break simulation procedure and the robustness evaluation method are applicable to both existing and new cable-supported bridges.

Highlights

Cables are the key components of cable-supported arch bridges
For long-span cable-supported arch bridges, the failure of a single cable may trigger progressive fracture of adjacent cables and damage to the deck and arch ribs. erefore, it is necessary to evaluate the robustness of cable-supported arch bridges subjected to cable breaking. is section discusses the robustness evaluation of the cable system, deck, and arch rib subjected to a single cable break
Cable breaking is common damage in cable-supported arch bridges as a result of aging and erosion caused by the harsh environment

Summary

Introduction

Cables are the key components of cable-supported arch bridges. Due to corrosion, abrasion, and fatigue, many cable fracture accidents of cable-supported arch bridges happened in the past few years. In the research of cable breaking of cable-stayed bridges, both Mozos [4, 5] and Zhou and Chen [6] concluded that an equivalent static analysis with a DAF of 2.0 cannot capture the extreme values of both moment and stress and should not be used in the response analysis of cable breakage events. E study of robustness evaluation of cable-supported bridges subjected to cable breaking has been very limited. Domaneschi et al [15, 21] used the applied element method in the study of disproportionate collapse of cable-stayed bridges and found that the structural redundancy was a strategic measure for avoiding disproportionate collapse and improving robustness. E main aim of this paper is to investigate the dynamic response and robustness of cable-supported arch bridges subjected to cable breaking.

System and Modeling

Cast-in-place

Cable Break Simulation Method

Dynamic Response Results

Robustness Evaluation

Conclusions