钢-混凝土组合梁收缩徐变效应的随机分析  

Stochastic analysis of shrinkage and creep effect of steel-concrete composite beam

作　　者：赵刚云[1,2] 向天宇[2] 徐腾飞[2] 占玉林[2] 

机构地区：[1]四川交通职业技术学院,成都611130 [2]西南交通大学桥梁工程系,成都610031

出　　处：《计算力学学报》2014年第1期67-71,共5页Chinese Journal of Computational Mechanics

基　　金：中央高校基本科研业务费专项(SWJTU09CX012);高等学校博士学科点专项科研基金(20090184120033;20110184120010)资助项目

摘　　要：钢-混凝土组合梁是由混凝土板和钢梁通过剪力键连接而成的组合结构。由于混凝土的收缩徐变,将引起结构内力和应力重分布。混凝土收缩徐变具有离散性大的特点,进而导致结构长期响应表现出随机性。本文综合考虑徐变模型、收缩模型、混凝土抗压强度、混凝土弹性模量、环境湿度、钢材弹性模量、荷载以及剪力键刚度的随机性对钢-混凝土组合梁结构响应的影响。利用拉丁超立方抽样技术和基于响应面方法的蒙特卡洛抽样,研究了钢-混凝土组合梁挠度和应力时变效应的概率问题。Steel-concrete composite girder is consisted of concrete slab and steel girder through shear con- nectors. Owing to shrinkage and creep of concrete, redistribution of structural internal force and stress should be caused. It is widely accepted that shrinkage and creep of concrete possess large randomness, which may induce the stochastic long-term structural responses. The influences of stochastic variation of creep and shrinkage model, compressive strength of concrete, elastic modulus of concrete, ambient humid- ity,elastic modulus of steel,load and stiffness of shear connector on structural responses of steel-con- crete composite beam are concerned in the present study. With Latin Hypercube Sampling and Monte Carlo sampling combining with Response Surface Method,the time-variant probabilistic responses of de- flection and stress of steel-concrete composite beam are studied.

关 键 词：钢-混凝土组合梁 收缩徐变 概率分析 拉丁超立方抽样 响应面法 

分 类 号：O324[理学—一般力学与力学基础]