【摘 要】
：
本文依托寒区高速铁路——哈大客运专线运粮河特大桥工程实例,利用大型有限元软件Midas/civil建立数值仿真模型,详细模拟了桥梁各施工阶段,根据后期变形最大的原则确定箱梁徐
【机 构】
：
湖南省建筑设计院有限公司,长沙410208哈尔滨工业大学,哈尔滨150001
论文部分内容阅读
本文依托寒区高速铁路——哈大客运专线运粮河特大桥工程实例,利用大型有限元软件Midas/civil建立数值仿真模型,详细模拟了桥梁各施工阶段,根据后期变形最大的原则确定箱梁徐变计算模式.然后根据各施工阶段及成桥后的实测数据,基于灵敏度分析对模型进行修正与优化,将修正模型用于模拟箱梁变形发展和预测长期变形上.仿真结果表明:梁体变形大致可以分为预应力钢筋张拉、徐变变形快速发展、二期恒荷载的施加及变形稳定发展4个阶段,二期恒载施加产生向下的挠度变形,一定程度减小了后期徐变上拱的发展.铺轨完成后梁体的残余变形量为8.2mm.
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