广州新客站主站房逆作法施工及预应力混凝土张拉全过程模拟分析

广州新客站主站房结构体系复杂,下部为铁路桥梁结构,中间为大跨度预应力混凝土框架结构,屋顶为大跨度预应力钢结构屋盖。为满足工期要求,采用逆作法施工方案,即先施工屋顶钢结构,然后再施工下部轨道梁、落客平台及高架层结构,此方案最终为钢结构安装、V构梁和21 m高架候车层等重要节点工程节约工期45～60 d。为了考察逆作法施工和后期预应力混凝土张拉对屋顶预应力钢结构的影响,建立整体模型,按照实际逆作法施工顺序进行了施工模拟计算,并与一次加载模型结果进行对比,为屋顶预应力钢结构拉索张拉方案的制定提供了可靠理论依据,为工程顺利施工提供参考。

SIMULATION ANALYSIS OF THE REVERSED CONSTRCTION AND PRESTRESSING OF THE MAIN BUILDING OF GUANGZHOU NEW RAILWAY STATION

The main building of Guangzhou Railway Station was built with complex structural system,its lower part structure is railway bridge,and the middle part structure is large-span prestressed concrete frame structure,and the roof is large-span prestressed steel structure.To meet the schedule requirements,reversed constrution was applied.The steel roof structures were constructed first,and then the rail beams,drop-off platform and overhead floor.This program finally saved 45 to 60 d for installation of the steel structure,V beam structure and 21 meter floor.In order to investigate the impact on the roof prestressed steel structure of the reversed construction and prestressing of the concrect,the integral model was built,and construction simulation was conducted,and the results were compared with those of one time loading simulation.A reliable theoretical basis was provided a for making the prestressing program for prestressed steel and prestressed concrete,which provided a reference for smooth construction of the project.