新型带肋中空薄壁方钢管混凝土的静力和滞回性能研究

项目名称： 新型带肋中空薄壁方钢管混凝土的静力和滞回性能研究

项目编号： No.51308124

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 王志滨

作者单位： 福州大学

项目金额： 25万元

中文摘要： 带肋薄壁方钢管混凝土柱由于用钢量少、节点简单等优点已受到学术界和工程界的广泛关注。但研究表明，带肋薄壁方钢管混凝土柱存在延性差、自重大和耐火性能较差等缺点。外钢管采用冷弯薄壁角钢焊接而成、在中空截面内置钢管被视为一种有效的方法,可提高该类构件的延性和耐火性能，同时还可有效的减小结构自重和焊缝数量。该类构件统称为"带肋中空冷弯薄壁方钢管混凝土柱"。但时至今日，尚未见和该类构件相关的研究报道。本项目拟采用试验方法和数值模拟法，对该类构件在单调和滞回荷载作用下的计算方法开展应用基础研究。基于试验研究、数值机理分析和参数分析，明晰内钢管对构件延性的影响规律；建立该类轴压、偏压构件承载力的简化计算方法；研究往复荷载作用对该类压弯构件的耗能能力、刚度和延性的影响规律；确定该类构件的实用恢复力模型。以上工作为该类新型构件在实际工程中的应用和相关规范的修订提供科学依据。

中文关键词： 加劲肋；复式薄壁钢管混凝土；中空夹层薄壁钢管混凝土；有限元；简化计算

英文摘要： Due to saving more steel and its simple joint, the square concrete-filled stiffened thin-walled steel tubular columns received extensive attention from academy and engineering. However, researches indicate that the square concrete-filled stiffened thin-walled steel tubular columns have many disadvantages such as bad ductility, big weight and bad fire resistance. An effective method, which can be used to improve the ductility and fire resistance, reduce the total weight of the structure and the number of welding seams, is to weld cold-formed thin-walled angle steels to be the outer steel tube and set the inner steel tube at the hollow section. This kind of specimens collectively called the hollow concrete-filled stiffened cold-formed thin-walled square steel tubular (HCFSCTSST) column. However, researches about the HCFSCTSST column have not yet been reported so far. Using experimental method and numerical simulation method, the calculating ways of the speciman under the static or dynamic load were investigated. Based on experimental study, numerical mechanism analysis and parameter analysis, the influence of inner steel tube on the ductility of the speciman is clarified and simplified calculation methods of the bearing capacity of the stub column and the beam-columns are presented. In addition, the effect of the

英文关键词： stiffener；concrete filled double thin-walled steel tube；concrete filled double-skin thin-walled steel tube；finite element mode；simplified models