钢-混凝土连续组合梁桥负弯矩区抗裂设计  

Anti-cracking design for hogging moment regions of steel-concrete continuous composite beam bridges

作　　者：李聪 聂建国[3,4] 周心怡 刘学武 LI Cong;NIE Jianguo;ZHOU Xinyi;LIU Xuewu(Changsha Public Engineering Construction Center,Changsha 410000,China;Hunan Provincial Communications Planning,Survey&Design Institute Co.,Ltd,Changsha 410200,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of China Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]长沙市公共工程建设中心,湖南长沙410000 [2]湖南省交通规划勘察设计院有限公司,湖南长沙410200 [3]清华大学土木工程系,北京100084 [4]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《建筑结构学报》2022年第3期172-178,共7页Journal of Building Structures

基　　金：中国铁路总公司科技研究计划重大课题(K2018G018);国铁集团科技研究开发计划重点课题(N2018G069)。

摘　　要：为进一步验证抗拔不抗剪连接件对组合梁桥负弯矩区抗裂的效果,并研究采用该连接件时负弯矩截面的设计方法,利用考虑滑移效应的组合梁负弯矩区受力模型,推导了采用抗拔不抗剪连接时组合梁负弯矩截面承载力的计算模型,计算结果与有限元分析结果吻合良好。通过理论推导,进一步证明了抗拔不抗剪连接件对负弯矩截面承载力的折减不大,且能有效延缓桥面板开裂。基于所推导的公式,总结了钢-混凝土连续组合梁桥负弯矩截面的简化设计流程,以供工程设计实践参考。In order to verify the effects of uplift-restricted and slip-permitted(URSP)connection on anti-cracking of hogging moment regions and develop the design methods,the calculation model of bearing capacity in hogging moment section of composite beams with URSP connections was built up by using the stress model of composite beams with hogging moment region considering slip effect.The model was verified in good agreement with the finite element analysis results.It could be further verified that the reduction of bearing capacity in the hogging moment section is small,and the cracking of the bridge deck is effectively controlled.Based on the formula deduced in this paper,the simplified designing procedure of the hogging moment section using URSP connections was summarized for engineering reference.

关 键 词：钢-混凝土组合梁 连续梁 负弯矩区 抗裂 抗拔不抗剪连接 有限元分析 简化计算式 

分 类 号：TU398.904[建筑科学—结构工程]