（1 邵阳学院城乡建设学院， 邵阳 422000；　2 湖南大学土木工程学院， 长沙 410082；3 贵州大学空间结构研究中心， 贵阳 550003）

［摘要］首先采用梁壳混合模型对方钢-混凝土组合空腹梁的变形和内力分布特征展开了研究，然后分析了跨高比、网格数和剪力键断面尺寸对结构静力响应的变化规律。结果表明：上、下肋局部弯矩均由边节间向中间节间递减，且在跨中节间，局部弯矩均使肋的下侧纤维受拉；除支座附近外，上肋中间节间的轴力均为压力，而下肋中间节间的轴力均为拉力，且向跨中逐步增大。剪力键在肋轴力差的作用下主要表现为平面“错动”，其内力从支座到跨中逐步减小；随着跨高比和网格间距的增大，结构挠度和内力均不断增大，而随着剪力键断面尺寸的加大，挠度和内力则有所减少。

［关键词］组合空腹梁； 梁-壳混合模型； 静力性能； 响应规律

中图分类号：TU398文献标识码：A文章编号：1002-848X(2018)24-0079-06

Static behavior and response regularity of square steel-concrete composite open-web beam

Yang Qizhu1,2, Ma Kejian3, Jiang Lan2, He Longxi1

(1 College of Urban Construction, Shaoyang University, Shaoyang 422000, China; 2 College of Civil Engineering, Hunan University, Changsha 410082, China；3 Space Structures Research Center, Guizhou University, Guiyang 550003, China)

Abstract:Firstly, the deformation and internal force distribution features of square steel-concrete composite open-web beam were studied by using the beam-shell mixed model. Then the variation regularity of span-to-height ratio, mesh number and section size of shear bond on the static response of the structure were analyzed.The results show that the local bending moments of the upper and lower ribs decrease from the side joints to the middle joints, and the lower rib fibers are pulled by the local bending moments in the mid-span joints. Except parts near the support, the axial force between the upper rib and the middle rib is pressure, while the axial force between the lower rib and the middle rib is tension which gradually increases toward the middle of the span. Under the action of the difference of rib axial forces, the internal force of shear bond decreases gradually from bearing to mid-span. With the increase of span-to-height ratio and mesh spacing, the structural deflection and internal force increase continuously, while the deflection and internal force decrease with the increase of section size of shear bond.

Keywords:composite open-web beam; beam-shell mixed model; static behavior; response regularity

*国家科技支撑计划子课题（2011BAJ09B01-01），邵阳学院博士专项项目（17ZX01）。

作者简介：杨期柱，博士，讲师， Email: yangqizhu@hnu.edu.cn。