沉井顶板钢混梁板组合结构抗弯性能试验研究  

Experimental Study on Flexural Performance of Caisson Roof Steel-Concrete Beam-Slab Composite Structure

作　　者：杜惺倩 夏才初 陈孝湘[3] 金天垚 Du Xingqian;Xia Caichu;Chen Xiaoxiang;Jin Tianyao(College of civil Engineering,Shaoxing University,Shaoxing,Zhejiang 312000,P.R China;College of Civil Engineering,Tongji University,Shanghai 200092,P.R China;POWERCHINA Fujian Electric Power Engineering Co.Ltd.,Fuzhou 350003,P.R.China)

机构地区：[1]绍兴文理学院土木工程学院,浙江绍兴312000 [2]同济大学土木工程学院,上海200092 [3]中国电建集团福建省电力勘察设计院有限公司,福州35003

出　　处：《地下空间与工程学报》2022年第3期883-890,900,共9页Chinese Journal of Underground Space and Engineering

摘　　要：依据沉井工程实际,设计并制作了两种地下沉井顶板钢混梁板组合结构的模型试件,根据钢骨架与混凝土板之间是否设置抗剪连接件,将两个模型试件分为梁板点焊连接的无抗剪模型以及梁板整体浇筑的有抗剪模型。通过对两个试件进行三点弯单轴静力加载试验,得到组合结构的抗弯承载力,并绘制出其跨中荷载-挠度曲线和荷载-应变曲线,分析二者破坏特征。通过对比试验可知:设置抗剪连接件可有效提高结构的整体性以及抗弯承载能力,并推迟混凝土板裂缝的开裂时间,减缓裂缝发展趋势;通过降低截面高度能提高组合结构的整体稳定性,并增加工作空间利用率。According to the practice of vertical shaft engineering, two types of composite structural model specimens of steel beam and slab are designed and made. According to whether shear connectors are set between steel skeleton and concrete slab, the two specimens are divided into two types: the shear model without spot welding of beam and slab, and the shear model with intesgral casting of beam and slab. Through the uniaxial static loading test at three-point bending, the flexural capacity of the structure was obtained, and the load-deflection curve and load-strain curve of the mid-span were plotted to analyze the failure characteristics. Through the comparative test, it can be seen that the installation of shear connectors can effectively improve the integrity of the structure and the flexural bearing capacity, delay the cracking time of concrete slabs and slow down the development of cracks. Reducing the height of the section can improve the stability of the structure and increase the utilization rate of the working space.

关 键 词：沉井顶板 钢混梁板组合结构 抗弯性能 试验研究 

分 类 号：TU398[建筑科学—结构工程]