TY - JOUR
PY - 2020//
TI - Dynamic effect of tie-bar failure on through tied arch bridge
JO - Journal of performance of constructed facilities
A1 - Fan, Bing-hui
A1 - Wang, Su-guo
A1 - Chen, Bao-chun
SP - e04020089
EP - e04020089
VL - 34
IS - 5
N2 - Tie bars on through tied arch bridges are often in poor condition and may serve as an external cause of a tie-bar failure accident; nevertheless, bridge structural robustness contributes greatly in resisting progressive collapse, and poor robustness tends to be the essential internal cause of possible accident. To study the dynamic effect of tie-bar failure of a through tied arch bridge and to reveal the mechanism of how structural robustness reduces dynamic effects, a finite-element model of a typical rigid-frame through tied arch bridge is developed based on the most adverse tie-bar breaking time, a transient-unloading method with equivalent load is adopted to analyze the dynamic response of tie-bar failure, and the results under different working conditions are compared. Furthermore, parameter analysis of the arch-to-pier stiffness ratio is conducted for the dynamic-amplification effect. The results indicate that both the pier and the arch rib have significant dynamic-amplification effects with respect to tie-bar breakage, and the remaining tie bars are the most vulnerable elements of the bridge; thus, they should be considered the most important elements when conducting tie-bar failure analysis; the most adverse breaking time adopted in cable breakage analysis can be taken as 0.01 T; a greater arch-to-pier stiffness ratio is beneficial to reduce the dynamic response brought on by tie-bar breakage; therefore, a rigid-frame through tied arch bridge should be designed with a large pier thrust stiffness, while a simply supported tied arch bridge should not be used in future through arch bridges, and existing ones should be retrofitted as soon as possible. Language: en
LA - en
SN - 0887-3828
UR - http://dx.doi.org/10.1061/(ASCE)CF.1943-5509.0001492
ID - ref1
ER -