深圳大运交通枢纽变截面倒梯形梁抗弯性能研究  

Research on Flexural Performance of Variable-Section Inverted Trapezoidal Steel Beams in Shenzhen Dayun Transportation Hub

作　　者：陈志华[1] 李文杰[1] 刘红波[1,3] 高修建 井司南 刘文锐 CHEN Zhihua;LI Wenjie;LIU Hongbo;GAO Xiujian;JING Sinan;LIU Wenrui(School of Civil Engineering,Tianjin University,Tianjin 300072,China;China Railway Design Corporation,Tianjin 300308,China;School of Civil Engineering,Hebei University of Engineering,Handan 056038,China)

机构地区：[1]天津大学建筑工程学院,天津300072 [2]中国铁路设计集团有限公司,天津300308 [3]河北工程大学土木工程学院,河北邯郸056038

出　　处：《工业建筑》2023年第9期88-94,共7页Industrial Construction

基　　金：河北省科技计划项目(2020HBQZYC013)。

摘　　要：为研究变截面倒梯形梁的抗弯力学性能,设计缩尺试件并开展四点静力加载试验,通过与数值模拟结果的对比分析,揭示了变截面倒梯形梁在横向荷载作用下的应力分布规律。结果表明:变截面倒梯形钢梁缩尺试件抗弯承载能力达到770 kN,面内抗弯承载性能优异,试件没有出现失稳问题;数值模拟结果与试验结果的变形特征相同,应力分布一致,两者计算所得抗弯承载力误差为3.9%,初始刚度误差为12.4%;与实际工程最不利荷载工况相比,变截面倒梯形钢梁承载力安全系数为12.4,设计荷载下试件挠度为4.14 mm,且处于弹性受力状态,满足挠度和工程安全性要求。In order to study the flexural performance of variable-section inverted trapezoidal steel beams,the scaled specimens were designed,and four-point static loading tests were carried out,which were compared and analyzed with numerical simulations to reveal the stress distribution law of variable-section inverted trapezoidal beams under vertical loading.The results showed that the flexural capacity of the scaled specimen reached 770 kN,and the in-plane flexural performance was excellent,and there was no instability problem in the test.The numerical model exhibited the same deformation characteristics and the same stress distribution as the test results,and the error in the flexural capacity was 3.9%,and the error in the initial stiffness was 12.4%.Compared with the most unfavorable loading condition of the actual project,the safety coefficient of the bearing capacity of the variable cross-section inverted trapezoidal steel beam was 12.4.The deflection of the member under the design load is 4.14 mm,and it is in elastic stress state,which meets the deflection and engineering safety requirements.

关 键 词：变截面 倒梯形 抗弯性能 数值模拟 缩尺试验 

分 类 号：TU31[建筑科学—结构工程]