摘要
目的研究端部不等高的钢-混凝土组合梁的整体力学特性,为变截面钢-混凝土的研究提供参考.方法制作两组1∶15的缩比例的端部不等高的钢-混组合梁并对其进行试验研究;分别对两个试件采用跨中单点加载与两点对称加载两种加载模式,测试参数为极限荷载、挠度、滑移以及截面应变等.结果单点加载的极限承载力和跨中最大位移为669.51 kN和26.45 mm,两点对称加载的极限承载力和跨中最大位移为924.94 kN和15.35 mm.两点对称加载的破坏模式主要为剪切破坏,单点加载的破坏模式为剪切、弯曲与局部承压并存.结论平截面假定适用于端部不等高的钢-混凝土组合梁的截面应力分析.与传统等截面钢-混凝土组合梁相比,端部变高度的钢-混凝土组合梁具有更大的抗弯刚度和抗剪承载能力.
The overall mechanical properties of steel-concrete composite beams with variable height at end are studied,which would provided some reference for the research of variable section steel-concrete.Two groups of steel-concrete composite beams with 1∶15 ratio and variable height at end are fabricated and tested.The single point loading was adopted for one specimen and the two point symmetrical for another,and the ultimate load,deflection,slip and section strain,etc as the mainly parameters were discussed.The results show that the bearing capacity and maximum displacement of mid-span of the specimen with single point loading are 669.51 kN and 26.45 mm,while the other of specimen with two-point symmetrical loading is 924.94 kN and 15.35 mm respectively.The failure mode of the specimen with the two-point symmetrical loading is mainly shear failure,while the other of specimen with single point loading is the coexistence of shear,bending and local bearing.The plane section assumption is applicable to the section stress analysis of steel-concrete composite beams with unequal ends.Compared with the traditional steel-concrete composite beams with uniform section,the steel-concrete composite beams with variable height at the end have greater bending rigidity and shear capacity at end.
作者
孙建鹏
刘银涛
孙文武
黄文锋
SUN Jianpeng;LIU Yintao;SUN Wenwu;HUANG Wenfeng(School of Civil Engineering,Xi′an University of Architecture and Technology,Xi′an,China,710055;School of Civil Engineering,Hefei University of Technology,Hefei,China,230009)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
CSCD
北大核心
2020年第2期202-211,共10页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51408453)
陕西省自然科学基础研究计划基金项目(2016JQ5075)
高等学校博士学科点专项科研基金项目(20136120120022)
陕西省教育厅科研计划项目(17JK0463)。
关键词
钢-混凝土梁
变截面
平截面假定
挠度
极限荷载
steel-concrete beam
variable section
flat section assumption
deflection
ultimate load
