桁架设计一般方法和误区探讨

重点分析了桁架的设计过程中容易被工程师忽略的支座设计，通过三种建模方式的比较，阐述了不同支座约束对桁架结构内力计算的影响，算例说明了实际工程的支座变形以及柱顶位移会对桁架结构造成杆件承载力小于实际内力的情况，还给出了滑动支座的节点详图，以指导工程实践。

Inquiry on general truss design methods and mistakes

This paper mainly analyzes bracket design which is easily neglected in truss design,describes the impacts of different bracket limitations on truss internal force calculation by comparing three kinds of modeling,the calculation demonstrates that actual engineering bracket deformation and roof column displacement will makes rod piece bearing capacity less than the actual internal force on the truss structures.Furthermore,it also shows movable bracket joint drawing,with a view to guide engineering practice.