型钢-混凝土组合梁桥面连续抗裂性能  

Crack Resistance of Continuous Slab in Section Steel-Concrete Composite Beam Bridge

作　　者：陈松 陈真 郭骞 冯博雅 孙路平 刘晓洲[1] CHEN Song;CHEN Zhen;GUO Qian;FENG Bo-ya;SUN Lu-ping;LIU Xiao-zhou(College of Civil Engineering and Architecture, Dalian University, Dalian 116622, China;Liaoning Provincial Communications Planning & Design Institute Co., Ltd., Shenyang 110111, China)

机构地区：[1]大连大学建筑工程学院,大连116622 [2]辽宁省交通规划设计院有限责任公司,沈阳110111

出　　处：《科学技术与工程》2021年第25期10909-10916,共8页Science Technology and Engineering

基　　金：辽宁省交通科技项目(201801);辽宁省博士科研启动基金(2020-BS-298)。

摘　　要：为了掌握常规设计方法下型钢-混凝土组合梁桥面连续的开裂特征和破坏模式,从而优化结构设计,对此类结构开展足尺模型试验和有限元分析。试验结果表明:常规设计方法下桥面连续构造抗裂性能差,在较低荷载下便会出现开裂;裂缝分布集中在桥面连续区域1.2 m范围内,裂缝数量少;试件破坏模式是剪力钉被剪断随后连接板钢筋屈服。基于试验结果,建立有限元模型进行进一步分析,分析结果表明:与不考虑滑移的梁相比,考虑滑移的组合梁的开裂荷载将提高,极限荷载取决于剪力连接件抗剪强度;栓钉间距、连接板厚度的增加能提高桥面连续的开裂荷载和极限承载力,栓钉直径对桥面连续的开裂荷载影响不大,但对其承载力影响较大;连接板底部与钢梁做无粘接处理可以大幅提高桥面连续开裂荷载。In order to grasp the cracking characteristic and failure mode of section steel-concrete composite beam bridge for optimization design,experiment and finite analysis were made for this structure's full scale model.The results show that the crack resistance of continuous slab is bad,it will crack when the load is small.The crack distribute on the continuous slab within 1.2 m and its amount is small.The failure mode is the shear connector breaks and the reinforce of continuous yield.Based on test result,a finite element model was made for further analysis,the results of analysis show that compared with the beam without considering slip,the cracking load of composite beam of considering slip will increase and the ultimate load depends on the shear strength of the shear connector.The increase of stud spacing and the thickness of connecting plate can improve the continuous cracking load and ultimate bearing capacity of bridge deck,the diameter of stud has little effect on the continuous cracking load of bridge deck but has great effect on its bearing capacity.The continuous cracking load of bridge deck can be greatly improved by bonding the bottom of connecting plate with steel beam without bonding treatment.

关 键 词：型钢-混凝土组合梁桥 桥面连续 抗裂性能 结构试验 有限元 

分 类 号：U411[交通运输工程—道路与铁道工程]