摘要
为研究混凝土收缩徐变对长期荷载作用下钢-混组合梁界面剪力和相对滑移的影响,提出一个简单实用的有限元分析方法。在假定荷载-滑移为线性以及钢梁与混凝土层之间无掀起的前提下,基于混凝土收缩徐变分析的初应变法,建立部分剪力连接钢-混凝土组合梁长期性能分析的有限元模型,其中界面行为通过建立混凝土板与钢梁之间对应节点的主从关系及特殊单元予以模拟。对比集中荷载作用下简支梁的计算结果与已有文献,验证所提方法的有效性。在此基础上研究收缩徐变对钢-混组合梁界面剪力和相对滑移的影响。结果表明,收缩徐变共同作用使得简支钢-混组合梁的界面滑移随着时间有较大程度地增加,但单独的收缩效应反而使界面滑移减小,尽管变化量可忽略不计;同时,由于界面剪力与滑移的正相关性,收缩徐变效应也使得端部界面剪力随时间增大,呈现出前期增长很快而后期增长缓慢的特点。
In order to study the effect of concrete shrinkage and creep on the interfacial shear and relative slip of steel-concrete composite beams under long-term loading,a simple and practical finite element method is proposed.On the premise that the load-slip is linear and there is no lift between the steel beam and the concrete layer,a finite element model for the long-term performance analysis of a partially shear coupled steel-concrete composite beam is established based on the initial strain method of concrete shrinkage and creep analysis.The interface behavior is simulated by establishing the master-slave relationship and special elements of the corresponding joints between the concrete slab and the steel beam.By comparing the calculation results of simply supported beams under concentrated loads with the existing literatures,the effectiveness of the proposed method is verified.Based on this,the influence of shrinkage and creep on the interfacial shear and relative slip of steel-concrete composite beams is studied.The results show that the interaction of shrinkage and creep makes the interface slip of the simply supported steel-composite beam increase with time to a large extent,but the single shrinkage effect makes the interface slip decrease,although the change is negligible.At the same time,due to the positive correlation between interfacial shear and slip,the shrinkage and creep effect also makes the interfacial shear at the end increase with time,showing a rapid growth in the early stage and a slow growth in the late stage.
作者
王文锋
谭建平
曹明辉
WANG Wenfeng;TAN Jianping;CAO Minghui(Poly Changda Engineering Co.,Ltd.,Guangzhou 511400,China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;Agricultural Service Center of Dongqu Sub-District Office,Zhongshan 528403,China)
出处
《森林工程》
北大核心
2024年第3期197-203,共7页
Forest Engineering
基金
国家自然科学基金资助项目(52078058)。
关键词
钢-混凝土组合梁
收缩徐变
界面行为
剪力连接件
有限元分析
Steel-concrete composite beams
shrinkage and creep
interface behavior
shear connector
finite element analysis
