开口截面钢-混凝土组合梁纯扭力学性能  

Mechanical Performance of Open Cross-Section Steel-Concrete Composite Beams Under Pure Torsion

作　　者：丁发兴[1,2] 束舒东 张经科 何畅 DING Fa-xing;SHU Shu-dong;ZHANG Jing-ke;HE Chang(School of Civil Engineering,Central South University,Changsha 410075,China;Engineering Technology Research Center for Prefabricated Construction Industrialization of Hunan Province,Changsha 410075,China;Hunan Airport Management Group Co.Ltd.,Changsha 410141,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南省装配式建筑工程技术研究中心,湖南长沙410075 [3]湖南省机场管理集团有限公司,湖南长沙410141

出　　处：《东北大学学报（自然科学版）》2024年第10期1485-1493,共9页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51978664).

摘　　要：为揭示开口截面钢-混凝土组合梁抗扭工作机理,提出适用于工程实际的抗扭承载力计算方法,建立了工字钢-混凝土组合梁精细有限元分析模型,探究了纯扭作用下混凝土板截面尺寸、混凝土强度、钢梁截面尺寸、钢梁强度、配筋率、宽跨比等参数对组合梁抗扭力学性能的影响.基于组合作用和叠加原理,提出了考虑混凝土板和钢梁腹板与翼缘抗扭贡献的开口截面钢-混凝土组合梁抗扭承载力计算公式.结果表明:组合梁抗扭承载力主要由混凝土板承担,混凝土板抗扭承载力组合作用系数为1.1,与实验结果吻合较好,能较好预测组合梁抗扭承载力.To reveal the torsional working mechanism of open cross‑section steel‑concrete composite beams,a calculation method for torsional bearing capacity applicable to engineering practice is proposed.A fine finite element analysis model of I‑beam‑concrete composite beams is established,and the influence of parameters such as concrete slab section size,concrete strength,steel beam section size,steel beam strength,reinforcement ratio,and width to span ratio on the torsional mechanical performance of composite beams under pure torsion is explored.Based on the principle of combination and superposition,a formula for calculating the torsional bearing capacity of open cross-section steel‑concrete composite beams considering the contribution of concrete slab and steel beam web and flange to torsional resistance is proposed.The results show that the torsional bearing capacity of the composite beam is mainly borne by the concrete slab,and the torsional combination coefficient of the concrete slab is 1.1,which is in good agreement with the experimental results and can predict the torsional bearing capacity of the composite beam well.

关 键 词：钢-混凝土组合梁 有限元分析 抗扭承载力 最大剪应力 组合效应 

分 类 号：TU375.1[建筑科学—结构工程]