既有钢-混凝土混合排架平面与空间计算结果的比较分析  

Comparision and Analysis between Planar and Spacial Caculating Results for Existing Steel-Concrete Mixed Bent Structure

作　　者：林建京[1] 

机构地区：[1]福建省建筑科学研究院,350025

出　　处：《福建建筑》2010年第6期46-47,38,共3页Fujian Architecture & Construction

摘　　要：对于由钢斜梁与钢筋混凝土柱组成的混合排架结构,在新建工程的结构设计时一般按平面结构体系进行横向与纵向的计算分析。在既有建筑的可靠性鉴定中,若按平面计算模型分析的排架柱承载能力略偏低时,是否可以考虑纵向连系梁对排架柱的约束作用,进而尽可能地降低实际的加固工作量,本文对此问题进行探讨。有限元计算结果表明,采用空间计算分析时,纵向连系梁的支点位于山墙处,由于一般工程的纵向平面尺寸较大,连系梁在排架平面内的线刚度较排架柱线刚度小得多,无法有效约束排架柱的变形,在竖向荷载、风荷载以及局部荷载等各种工况组合作用下,排架柱按平面模型计算的结果与按空间模型计算的结果基本一致,即对于该类型结构,在既有建筑可靠性鉴定以及排架柱的加固设计时,一般仍按平面结构体系进行结构横向与纵向的计算分析。For steel-concrete mixed bent structure composed of sloped steel beam and reinforced concrete column,planar structure assumption is often applied for the design of newly-built buildings and the calculation is often carried out in transverse and longitudinal direction independently.For reliability appraiser of existing buildings,the question that how to consider the constraining effect of the longitudinal connecting beam for the bent column if the carrying capacity of bent column is not enough deserves discussing as it can reduce the actual strengthening amount of existing buildings.Based on spacial model,the finite element analytical results shows that,the calculation results of spacial model are nearly consistent with the results of planar model,namely,for the reliability appraiser of this kind of structure,the planar model assumption can be tenable and the analysis can also be carried out in the transverse and longitudinal direction independently.It is because the supporting point of the longitudinal connecting beams is on the frontispiece wall and the longitudinal length of general project is rather long,as a result,the line stiffness of the connecting beam is much smaller than that of the bent column and this phenomena leads to the fact that the distortion of bent column could not be constrained effectively.

关 键 词：钢-混凝土混合排架 既有建筑 平面计算模型 空间计算模型 

分 类 号：TU311.4[建筑科学—结构工程]