【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。更多还原

【Abstract】 Steel-concrete composite girder is consisted of concrete slab and steel girder through shear connectors.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 humidity,elastic modulus of steel,load and stiffness of shear connector on structural responses of steel-concrete 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 deflection and stress of steel-concrete composite beam are studied.更多还原