钢混叠合梁面板开裂因素及裂缝控制  

Cracking Factors and Crack Control of Steel-concrete Composite Beam Panels

作　　者：于英霞[1] 郭洁 王艳明 李文杰[1] YU Yingxia;GUO Jie;WANG Yanming;LI Wenjie(School of Civil Engineering and Architecture,Henan University of Science and Technology,Luoyang 471023,China;CCCC-SHEC Forth Engineering Co.Ltd.,Luoyang 471013,China)

机构地区：[1]河南科技大学土木建筑学院,河南洛阳471023 [2]中交二公局第四工程有限公司,河南洛阳471013

出　　处：《河南科技大学学报(自然科学版)》2025年第1期58-67,M0005,M0006,共12页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(11502072);中交二公局有限公司重点科研项目(2022X-2-7);河南省科技厅产学研合作项目(2015HNCXY011)。

摘　　要：钢混叠合梁跨径大,负弯矩区附近面板易出现裂缝,明确开裂影响因素并确定有效的裂缝控制措施,对大跨径钢混桥发展具有重大意义。基于混凝土开裂机理和80 m跨钢混梁精细化模型,分析各影响因素在不同施工荷载下裂缝开展情况。结合原位试验确定裂缝控制效果较好的施工方法并应用。结果表明:混凝土强度、钢筋应力对裂缝开展的影响呈线性减小,且0.5%~1.5%的钢纤维掺量能够提高混凝土抗裂性能。配筋率适当增大可抑制裂缝开展,当超过2.0%时效果不再显著。在负温差及汽车超载60%时,裂缝宽度增加49%。采用提拉叠合技术+优化施工顺序后,面板压应力储备增加6.32 MPa,且受拉区域收敛。次边跨的监测值证明了在该控制措施的作用下桥面板能够更好地抵抗裂缝开展。Steel-concrete composite beams have a large span,and the panels near the negative bending moment area are prone to cracking.Identifying the factors that influence cracking and determining effective crack control measures are of great significance for the development of long-span steel-concrete bridges.Based on the concrete cracking mechanism and the refined model of the 80 m span steel-concrete beam,the crack development of various influencing factors under different construction loads was analyzed.Combined with the in-situ test,the construction method with better crack control effect was determined and applied.The results indicate that the impact of concrete strength and steel reinforcement stress on crack propagation decreases linearly,and a steel fiber content ranging from 0.5%~1.5%can enhance the crack resistance of concrete.An appropriate increase in the reinforcement ratio can inhibit crack development,but when it exceeds 2.0%,the effect becomes less significant.Under negative temperature differences,when the vehicle is overloaded by 60%,the crack width increases by 49%.After the lifting and pulling superposition technology and the optimized construction sequence were adopted,the compressive stress reserve of the panel increased by 6.32 MPa,and the tensile region converged.The monitoring values of the secondary side span demonstrate that the bridge deck is better able to resist crack development under this control measure.

关 键 词：大跨径钢混梁 负弯矩区 裂缝宽度 原位试验 裂缝控制 提拉叠合 

分 类 号：U441[建筑科学—桥梁与隧道工程]