摘要
为研究带抗剪键叠合板的力学性能,基于试验和有限元模拟方法,通过对比抗剪键数量不同的叠合板荷载-挠度曲线,分析了设置抗剪键的必要性。通过对比带抗剪键叠合板与现浇板的受力过程,分析了叠合板的受力特点。提取了抗剪键剪力,分析了抗剪键破坏过程及剪力分布规律,并建立了剪力简化计算式。结果表明:抗剪键能明显提高叠合板的刚度和承载力;与现浇板相比,叠合板板底混凝土开裂和钢筋屈服时,板底混凝土第一主应力分布规律明显不同,而板底钢筋应力和位移分布规律相近;叠合板内各抗剪键剪力随荷载增加,先呈线性增加,后突然下降,抗剪键剪力值越靠近支座越大。最后,提出了抗剪键的布置方法。
In order to study the mechanical properties of laminated slab with shear keys,the necessity of setting shear keys was analyzed based on the experiment and finite element simulation method by comparing the load-deflection curves of the laminated slabs with different number of shear keys.The stress characteristics of the laminated slabs were analyzed by comparing the loading process of the laminated slab with shear keys and the cast-in-place slab.The damage process and the shear force distribution law of the shear keys were analyzed respectively by extracting the shear force of the shear keys,and the simplified calculation equation for the shear force was established.The results show that the shear keys can significantly improve the stiffness and the bearing capacity of the laminated slab.Compared with the cast-in-place slab,when the concrete at the bottom of the laminated slab is cracked and the steel bar is yielded,a significant difference exists in the distribution law of the first principal stress of the concrete at the bottom of the slab,while a similarity occurs in the stress distribution law of the steel bars and the displacement distribution law at the bottom of the slab.With the increase in the load,the shear force of each shear key in the laminated slab increases linearly and then drops suddenly.The shear force of the shear key is bigger as the shear key gets closer to the bearing.At last,the layout method of shear keys is put forward.
作者
李明
王浩然
赵唯坚
LI Ming;WANG Hao-ran;ZHAO Wei-jian(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2019年第5期1509-1520,共12页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金面上项目(51278312)
辽宁省科学技术计划项目(201805500288)
沈阳市科技支撑计划项目(18-013-0-29)
关键词
土木工程
叠合板
抗剪键
力学性能
分布规律
civil engineering
laminated slab
shear key
mechanical properties
distribution law
