Research on the Influence of Pre-camber on Vehicle Dynamic Characteristics of Long-span Cable-stayed Bridge
SU Chengguang1, GAO Tianci2, ZHANG Min1, WEI Zhouchun1, LIU Chao1
1.China Railway First Survey and Design Institute Group Co. Ltd, Xi'an, Shaanxi 710043, China； 2.MOE Key Laboratory of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
Abstract：Research purposes：The actual alignment of the long-span cable bridges can easily deviate from the theoretical design alignment, which is a difficult critical issue that may affect the safety and smoothness of the train operation. Proper pre-camber is one of the effective approaches to this problem. In this paper, a three-dimensional vehicle-track-bridge coupling dynamic model is established to analyze the vehicle dynamic response of a 330 m long bridge with main span under four alignment of the most unfavorable load superposition with pre-camber, and the influence of different pre-camber schemes on vehicle dynamic response of long-span cable-stayed bridge is investigated.Research conclusions： (1) The safety index and comfort index of train passing through the long-span bridge meet the standard requirements under different pre-cambers, and there are many safety redundancy. (2) Setting pre-camber can effectively reduce the vertical acceleration of vehicle and improve passenger comfort. (3) The most unfavorable position for the smoothness of the long-span bridge is at tower and the middle of main span. It is necessary to strengthen the construction quality control and pay attention to the observation and maintenance during the operation to ensure the operation safety and riding passenger comfort. (4) The research result can provide a reference for the design, construction and maintenance of the long-span cable-stayed bridge.
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