长期荷载作用下钢-竹组合楼板的力学性能  

The Mechanical Properties of Steel-bamboo Composite Slab under Long-term Load

作　　者：周佳如 李玉顺[1] 王嘉琳 张家亮[1] 童科挺 ZHOU Jiaru;LI Yushun;WANG Jialin;ZHANG Jialiang;TONG Keting(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学土木与环境工程学院

出　　处：《森林工程》2020年第1期109-114,共6页Forest Engineering

基　　金：国家自然科学基金项目(51378265)

摘　　要：为构建人与自然和谐发展的理念,提出一种由冷弯薄壁型钢与竹胶板组成的环保型组合楼板,研究此种钢-竹组合楼板在长期荷载下的力学性能。采用有无紧固件为试验参数,制作试件并进行长期荷载试验,分析钢-竹组合楼板的挠度随时间的变化规律以及型钢与竹胶板的应变随时间的变化规律;同时对卸载后的钢-竹组合楼板进行二次抗弯试验,并和短期试件的抗弯试验比较。研究表明:长期荷载作用下,钢-竹组合楼板蠕变值不大,型钢与竹胶板的应变变化趋势一致,试件在长期荷载作用后承载力衰减约7%,说明钢-竹组合楼板能充分发挥两种材料的力学性能特点,具有良好的整体性能和承载能力;通过理论推导,推出钢-竹组合楼板的短期刚度计算公式,并提出长期刚度建议公式和挠度计算方法,其理论值与试验值吻合较好。According to the concept of harmonious development between human and nature, an environment-friendly composite slab of cold-formed thin-wall steel and bamboo plywood is proposed. In order to investigate its mechanical properties under long-term load, the specimens are produced and tested with fasteners or no fasteners as experimental parameters, analysis of the deflection development of steel-bamboo composite slabs with time and the strain development of steel and bamboo with time are obtained, moreover the second bending test of specimens after unloading is carried out to be compared with the bending test of short-term specimens. The results show that the creep of steel-bamboo composite slabs is small under long-term load, the strain development trend of steel and bamboo are consistent, the bearing capacity of composite slabs decay by about 7%, which prove steel-bamboo composite slabs can give available play to the mechanical properties of two kinds of materials, and have good overall performance and bearing capacity. Through theoretical derivation, the short-term stiffness formula of steel-bamboo composite slabs is deduced, and the proposed formulas of long-term stiffness and deflection are in good agreement with the experimental results.

关 键 词：钢-竹组合楼板 长期荷载试验 整体性能 蠕变 长期刚度 

分 类 号：TU398[建筑科学—结构工程] TU366