摘要
根据广州某工程项目中遇到的工程难题,提出了一种新型带腋撑型钢混凝土大跨度框架结构,通过非线性有限元分析,研究该新型结构的力学性能。结果表明:新型结构和常规的型钢混凝土框架结构相比,其设计控制截面由梁跨中和节点区的梁端、柱端转移了到梁、柱和腋撑的连接处;梁柱节点区和框架梁跨中处设计控制截面弯矩值大幅度降低;在竖向加载下,靠近中柱的梁腋撑连接处首先出现塑性铰,随后塑性铰出现在梁跨中处和靠近边柱的梁腋撑连接处,梁端及节点区受力性能良好,最终边柱腋撑连接处也出现塑性铰;在水平荷载下,远离水平加载点的边柱柱脚为最不利截面,该新型结构具有良好的受力性能、变形性能和较好的抗震性能。
According to the engineering problems encountered in a project in Guangzhou,a new type of long-span steel reinforced concrete frame structure with armpit bracing is proposed,and the mechanical properties of the new structure are studied by nonlinear finite element analysis.The results show that compared with the conventional steel reinforced concrete frame structure,the design control section of the new structure is transferred from the beam end and column end in the middle of the beam span to the joint of the beam,column and armpit brace,and the bending moment of the design control section in the beam-column joint area and in the middle of the frame beam span is greatly reduced.Under vertical loading,the plastic hinge first appears at the axillary brace connection of the beam near the middle column,and then the plastic hinge appears at the middle of the beam span and near the side column,and the stress performance of the beam end and joint area is good.Finally,the plastic hinge also appears at the axillary brace joint of the side column.Under the horizontal load,the foot of the side column far from the horizontal loading point is the most unfavorable section,and the new structure has good mechanical performance,deformation performance and good seismic performance.
作者
王泳康
黄炎生
马平川
蔡健
杨春
Wang Yongkang;Huang Yansheng;Ma Pingchuan;Cai Jian;Yang Chun(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510614,China)
出处
《科技通报》
2021年第10期95-100,共6页
Bulletin of Science and Technology
关键词
腋撑
型钢混凝土
大跨度
非线性有限元分析
armpit brace
steel reinforced concrete
long span
nonlinear finite element analysis
