索网结构抗火实用设计方法  

Practical fire-resistant design of cable net structure

作　　者：李国强[1] 周焕廷[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《空间结构》2007年第4期43-50,共8页Spatial Structures

基　　金：国家杰出青年科学基金资助项目(50225825)

摘　　要：进行了大空间索网结构在火灾下三维非线性有限元分析,通过对影响索网结构临界温度的各因素进行敏感性分析,确定了影响临界温度的主要因素为荷载比和预应力比.根据对工程中常见的三种平面形状的鞍形索网的临界温度参数分析,得到了鞍形索网结构临界温度与荷载比及预应力比关系的实用表格.对于确定索网结构荷载比所需的最大荷载给出了解析表达式,为索网结构抗火设计提供了简便实用的方法.3-D nonlinear FEM analysis had been conducted for the cable-net structure at high temperature. Parameter sensitive analysis found the main factors influencing cable net＇s critical temperature are load ratio and prestress ratio. Through parameter analysis for three ordinary kinds of cable net ＇s critical temperature, practical designed table between critical temperature, load ratio and prestress ratio had been obtained. The analytic expression of saddle cable net＇s maximum loads had been conducted. The work here provided a kind of simplified method to estimate cable net＇s critical temperature.

关 键 词：鞍形索网 抗火 临界温度 实用方法 

分 类 号：TU351[建筑科学—结构工程]