轨道交通先张法预制U型梁静载试验方法与性能研究  

Static Load Test Method and Performance of Rail Transit Pre-tensioned Precast U-shaped Beam

作　　者：王晓磊 WANG Xiaolei(Guangdong Construction Engineering Company Limited of China Railway Third Group,Guangzhou,Guangdong 510630,China)

机构地区：[1]中铁三局集团广东建设工程有限公司,广东广州510630

出　　处：《水利与建筑工程学报》2022年第3期162-168,共7页Journal of Water Resources and Architectural Engineering

基　　金：重庆市基础研究与前沿探索项目(cstc2018jcyjA2535)。

摘　　要：目前我国轨道交通行业尚无关于预制U型梁的相关试验规程。对成批预制的先张法U型梁,需按照一定抽样频率进行静载试验,测试U型梁的力学性能,进行受力性能的评定。提出了一种可适用于多种跨径的预制U型梁静载试验方法。该方法采用反力架进行荷载加载,提出加载弯矩与设计最大弯矩相等、支点剪力与设计最大剪力近似相等的同时加载原则。然后以深圳市城市轨道交通6号线工程先张法预制U型梁为例,进行了试验方案设计,通过合理布置加载点,在保证跨中弯矩加载效率均为1.0的前提下,同时确保支点剪力加载效率在0.81~0.95。为避免道床板横向弯曲受损,加载弯矩超过1.0倍的设计荷载值后,保持道床板加载力不变,继续增加的荷载值通过腹板顶部千斤顶加载。分析试验结果表明该先张法U型梁的试验方法经济合理,为今后先张法预制U型梁的静载试验检测推广使用提供借鉴。Relevant test standards were not proposed for prefabricated U-shaped beams in the rail transit field at present.For batch prefabricated U-shaped beams,the static load test should be carried out at a certain sampling frequency to test and evaluate the mechanical properties.A new static test method is proposed which can be applied to multi span precast U-shaped beam.Reaction frame loading was used and a loading principle was recommended of which the loading bending moment is equal to the maximum design bending moment and the loading shear is approximately equal to the maximum design shear at the same time.The prefabricated U-shaped beam of Shenzhen urban rail transit line 6project was taken as an example,the test scheme is designed,which can ensure the load efficiency of 1.0 and the shear load efficiency of 0.81~0.95.In order to avoid premature lateral damage of the bed plate,the increased load is loaded through the top jack of the web after the loading moment exceeding 1 times the design value,and the load force of the bed plate is maintained.The test results show that the test method of pre-tension U-shaped beam is economical and reasonable,which can provide valuable references for static load test of prefabricated U-shaped beam in the future.

关 键 词：轨道交通 预制U型梁 静载试验 力学性能 试验方法 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]