Determination Method on Initial Pretension of Cables in Steel Mega Frame and Prestressed Composite Bracing Structure  

作　　者：唐柏鉴 王飞 顾盛 

机构地区：[1]School of Architecture and Civil Engineering,Jiangsu University of Science and Technology

出　　处：《Journal of Donghua University(English Edition)》2013年第6期455-460,共6页东华大学学报（英文版）

基　　金：Project of Ministry of Housing and Urban-Rural Development of China(No.2012-K2-28)

摘　　要：Determining initial pretension values of pre-stressed cables is one of the key problems for a steel mega frame and pre-stressed composite bracing structure.Through the mechanical analysis of the composite bracing under vertical loading,the critical factors deciding the initial pretention value were found.According to these factors,a rule for the initial pretension value was put forward.The determination equations were acquired based on the principle of force equilibrium at nodes.The numerical results indicate that the internal force disequilibrium in composite bracings resulted from symmetrical load can be eliminated only in a symmetrical way,so that initial pretention values are decided only by vertical loads.The influencing coefficient leveling method,taking into account interactions between story and story,is accurate and feasible.Determining initial pretension values of pre-stressed cables is one of the key problems for a steel mega frame and pre-stressed composite bracing structure. Through the mechanical analysis of the composite bracing under vertical loading, the critical factors deciding the initial pretention value were found. According to these factors, a rule for the initial pretension value was put forward. The determination equations were acquired based on the principle of force equilibrium at nodes. The numerical results indicate that the internal force disequilibrium in composite bracings resulted from symmetrical load can be eliminated only in a symmetrical way, so that initial pretention values are decided only by vertical loads. The influencing coefficient leveling method, taking into account interactions between story and story, is accurate and feasible.

关 键 词：pre-stressed steel structure mega frame composite bracing initial presention ： influencin coefllcient levelinf method 

分 类 号：TU352.13[建筑科学—结构工程] TU394