交错钢桁架体系的腹杆布置及其截面形式研究

混合桁架是钢结构交错桁架体系常用的桁架形式，用于工程实践时，应采用适宜的腹杆布置形式及经济合理的截面形式。本文主要研究了以下几个方面的问题：因建筑需要而设置的空腹节间处于桁架内不同位置时，桁架杆件在竖向荷载作用下的内力变化；常用对称式混合桁架的腹杆布置形式对桁架内力及总用钢量的影响；桁架腹杆采用T型钢、矩形钢管、圆钢管、角钢时桁架的总用钢量比较。比较结果表明：空腹节间不应设置在桁架端部；常用混合桁架腹杆采用“之”形布置时用钢量最省；桁架腹杆选用T型钢和角钢较为经济合理。

Research of arrangements of web members and feasible styles for truss members of the staggered truss system

The pratt truss with diagonals omitted for passageways is the most efficient type of truss to be used in the staggered truss(system).To be economical for mass production,the trusses throughout the building should be identical in form and type of members,designed so that jigs can accommodate the slight differences in member dimensions.This paper analyzes the varieties of the load bearing behavior of the truss from the different location of the vierendeel panel and the different arrangements of web members,and it illustrates that the vierendeel panel can't be placed at the end of the truss.It also give the feasible styles for web members of the staggered truss system.