摘要
为研究新型预应力外包波纹钢-混凝土组合梁的受弯性能,以预应力、抗剪连接件数量和混凝土翼缘板有效宽度为参数,进行4根试件的受弯试验,结果表明:波纹钢能较好地与混凝土协同工作,有效加强钢-混界面,避免纵向滑移破坏的发生,但是波纹钢轴向刚度较小,几乎没有抗弯贡献;预应力和混凝土翼缘板对组合梁的抗弯贡献较大;抗剪连接件数量不足时组合梁发生纵向水平剪切破坏。在试验基础上进行有限元模型模拟计算,发现新型组合梁能充分发挥各组成部分间的组合作用,提高试件的抗弯承载力与延性;相比于直钢板组合梁,波纹钢组合梁有较好的刚度和较高的承载能力;随着混凝土强度提高,承载力略有提升;下翼缘钢板厚度增加,承载力显著提高,对刚度影响不大;刚度、承载力随预应力度提高而提高,但是延性变差。最后,建立了新型预应力外包波纹钢-混凝土组合梁受弯承载力计算公式。
In order to study the flexural performance of a novel prestressed steel-encased concrete composite beam with corrugated steel webs,four bending tests were carried out taking prestressed tendons,the number of shear connectors and the width of concrete slab as parameters.Results show that corrugated steel can work well with concrete,effectively strengthen the steel-concrete interface to avoid the occurrence of longitudinal slip failure.However,its axial stiffness is small and contributes little to bending capacity.Prestress and the concrete flange plate have a greater contribution to the bending capacity of the composite beam,and the longitudinal horizontal shear failure occurs when the number of shear connectors is insufficient.On the basis of experimental study,the finite element model is established.Results show that the new composite beam can take full advantage of the combined functions of each component and improve the flexural capacity and ductility of the specimen.Compared with the straight steel composite beam,the corrugated steel composite beam has better rigidity and higher bearing capacity.With the increase of concrete strength,the bearing capacity increases slightly.With the increase of the thickness of the lower flange plate,the bearing capacity of the steel plate is significantly increased,which has little influence on the stiffness.Stiffness and bearing capacity increase with the increase of prestressing degree,but ductility decreases.Finally,a calculation formula of flexural capacity is derived.
作者
谢梦洁
邹昀
王城泉
钱慧超
曹岚
陈明
XIE Meng-jie;ZOU Yun;WANG Cheng-quan;QIAN Hui-chao;CAO Lan;CHEN Ming(School of Environment&Civil Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China;Shanghai Open Steel Structure Co.,Ltd.,Shanghai 200127,China)
出处
《工程力学》
EI
CSCD
北大核心
2021年第7期64-74,共11页
Engineering Mechanics
基金
2018年科技厅社会发展面上项目(BE2018625)
国家自然科学基金项目(51378240)
江苏省自然科学基金项目(BK20180623)。
关键词
新型外包钢-混凝土组合梁
抗弯试验
波纹钢
预应力
受弯承载力
novel steel-encased concrete composite beam
flexural experiment
corrugated steel
prestressed
bending capacity
