摘要
大跨度建筑通过采用空腹桁架结构,可以降低框架梁弯矩幅值、减小构件截面尺寸、增加结构净空高度,为实现较小截面尺寸构件建造大跨度建筑的可能提供理论依据。文章结合工程实例,采用sap2000对空腹桁架的不同方案进行静力分析,并与普通框架结构进行对比,通过分析空腹桁架不同方案的静力性能,确定合理的腹杆布置方法,分析腹杆与框架梁的内力和变形随两者线刚度比的变化情况,研究腹杆与框架梁的线刚度比对空腹桁架静力性能的影响。结果表明:当空腹桁架两端各设置一根腹杆时,腹杆的刚心应位于距支座0.2L处;当空腹桁架两端各设置两根腹杆时,每端腹杆的对称中心应分别位于框架梁的0.2L和0.8L处,且对称中心距两侧腹杆的刚心为0.08L;为提高空腹桁架结构的静力性能,腹杆与框架梁的刚度比应控制在1.6~3.8;腹杆主要承受弯矩和剪力,承受的轴力较小。
Large-span buildings adopt an open-web truss structure to reduce the bending moment amplitude of frame beams,reduce the section size of members,and increase the structural headroom.It provides a theoretical basis for the realization of the possibility of building large-span buildings with small section size.This article combines engineering examples,uses sap2000 to perform static analysis on different schemes of open-web trusses,and compares them with ordinary frame structures.By analyzing the static performance of different schemes of open-web trusses,a reasonable method for arranging web members is determined.One of the schemes is based on the analysis of the change in the internal force and deformation of the web member and the frame beam with the linear stiffness ratio of the two,and the influence of the line stiffness ratio of the web member and the frame beam on the static performance of the open web truss was explored.The results show that when one web bar is set at each end of the open web truss,the rigid center of the web bar should be located 0.2L away from the support.When two web bars are set at each end of the open web truss,the symmetrical center of the web bar at each end They should be located at 0.2L and 0.8L of the frame beam,respectively,and the center of symmetry is 0.08L from the rigid center of the web members on both sides.In order to improve the static performance of the open web truss structure,the stiffness ratio of the web beam to the frame beam should be controlled at 1.6~3.8.The web rod mainly bears bending moment and shear force,and the axial force it bears is small.
作者
边广生
郝夏晖
BIAN Guangsheng;HAO Xiahui(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China)
出处
《山东建筑大学学报》
2020年第3期21-27,共7页
Journal of Shandong Jianzhu University
关键词
大跨度
空腹桁架
静力性能
弯矩幅值
long span
open-web truss
static performance
bending moment amplitude
