河南科技大学学报（自然科学版）2025，Vol.46Issue(1)：58-67,10.DOI:10.15926/j.cnki.issn1672-6871.2025.01.008
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
摘要
Abstract
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Key words
long-span steel-concrete beam/negative moment region/crack opening/in-situ test/crack control/Czochralski superposition分类
交通工程引用本文复制引用
于英霞,郭洁,王艳明,李文杰..钢混叠合梁面板开裂因素及裂缝控制[J].河南科技大学学报（自然科学版）,2025,46(1):58-67,10.基金项目
国家自然科学基金项目(11502072) （11502072）
中交二公局有限公司重点科研项目(2022X-2-7) （2022X-2-7）
河南省科技厅产学研合作项目(2015HNCXY011) （2015HNCXY011）
