摘要
传统组合梁在采用连续梁体系时中间支座附近承受负弯矩会使上层砼板过早开裂,工字钢下翼缘因此承受较大压力易引起局部失稳。弥补此缺陷的措施是在负弯矩区钢梁下翼缘增设砼板,通过剪力件与钢梁连接,其作用是使钢梁下翼缘"固结"于砼板内,增强钢梁的局部抗稳定能力,即双层砼板组合梁。本文将双层砼板组合梁节段假定为Goodman弹性夹层,利用Abaqus6.5建立双层砼板组合梁空间模型,采用滑移单元slide-plane模拟剪力连接件,重点研究下部剪力件的变化对上层砼板应力的影响,得出了下部剪力度的经济值约为1.0。
In traditional continuous steel-concrete composite beam the crack in the concrete that suffers negative bending moment grows easily and the bottom steel flange may appear ＂local bucking＇or＂overall bucking＇and its bearing capacity weakens greatly.To solve this problem,concrete slab should be added on the lower steel girder to strengthen stablity,and shear stud is used in the composite beam.In this paper,the interface slip between concrete and steel as well as the deflection of the double composite beam was analyzed by using Goodman elastic sandwich.A 3-DFEAmodel was set up by Abaqus6.5 to analyze upper concrete slab stress influence by lowr shear degree.Analysis shows that the economic value of lower shear degree is 1.0.
出处
《科技通报》
北大核心
2011年第4期561-565,600,共6页
Bulletin of Science and Technology
关键词
双层砼板
组合梁
剪力度
界面滑移
有限元
double concrete slab
composite beam
shear degree
inerface slip
theoretical method
finite element model
