【摘要】 对于高速铁路大跨度钢筋混凝土拱桥,混凝土收缩与徐变引起的时变变形对轨道平顺性会产生不利影响,进而影响到列车行车的舒适性和安全性。对于大跨度混凝土桥梁,混凝土收缩与徐变的随机性会导致结构长期变形表现出离散性,因而建议采用随机分析方法获得长期变形的概率结果。该文介绍GL2000收缩徐变模型,确定长期效应分析中主要随机变量及其参数取值。采用拉丁超立方抽样技术和基于响应面的蒙特卡洛抽样技术,对高速铁路大跨度钢筋混凝土拱桥时变变形进行随机分析。同时,利用敏感性分析技术研究不同随机变量对结构长期变形的贡献。更多还原

【Abstract】 For the long-span high-speed railway reinforced concrete arch bridges,the time-variant deflections caused by creep and shrinkage of the concrete negatively influence the quality of track smoothness,causing decrease of safety and comfort for train running.For long-span concrete bridges,long-term deflections may be scattered due to uncertainties in creep and shrinkage of the concrete.Therefore,stochastic analysis should be performed.In this paper,GL2000 model about creep and shrinkage of concrete is introduced.Important stochastic variables for long-term analysis are presented,and their statistical parameters are determined.With Latin hypercube sampling technique and Monte Carlo sampling combined with the response surface method,stochastic analysis of the time-variant deflections of long-span reinforced concrete arch bridges for high-speed railways is performed.Contributions of the random variables to structural long-term response are investigated through sensitivity analysis.更多还原