超长预应力混凝土结构收缩徐变敏感性分析  

Sensitivity Analysis of Creep and Shinkage in Super-long Prestressed Concrete(PC) Structure

作　　者：顾炜[1] 熊学玉[1,2] 黄鼎业[1,2] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《建筑材料学报》2008年第5期535-540,共6页Journal of Building Materials

基　　金：上海市建设技术发展基金资助项目(B05043);上海现代建筑设计(集团)有限公司资助项目(20061B006)

摘　　要：将徐变系数、收缩应变、抗压强度、预应力和环境相对湿度等混凝土材料时随特性作为随机因素,采用拉丁超立方抽样随机模拟法进行了超长预应力混凝土结构的概率分析.以一超长预应力混凝土框架结构为例,考察了10 645 d内季节性温差作用下该结构变异与混凝土材料时随特性之间的相关性.结果表明:随着时间的增长,该结构变异范围增大;预应力和混凝土抗压强度是一层端柱柱顶侧移和二层楼板第一主应力的主要影响因素,收缩模型不确定性对二层楼板第一主应力的影响也较强.Based on Latin hyper sampling stochastic simulation, a probabilistic analysis was performed for super-long PC structure. Concrete material＇s time-dependent property, such as creep coefficient, shrinkage strain, compressive strength, prestressing force and relative humidity are modeled as random variables. Taking an super-long PC frame structure under 10 645 d （about 30 years） seasonal temperature load as example, the correlation between structural variation and concrete material＇s time-dependent property were studied. The results show： the variation range of structure increases with time. Prestressing force and concrete compressive strength are major factors for column displacement of first floor and first principal stress of second floor plate. The shrinkage model uncertainty is also important for first principal stress of second floor plate.

关 键 词：敏感性 预应力混凝土 收缩 徐变 温度 

分 类 号：TU528.571[建筑科学—建筑技术科学]