多重体系转换对大跨无柱地下空间结构力学行为影响  

Influence of multiple system transformation on the mechanical behavior of long-span non-column underground spatial structure

作　　者：秦学锋 侯文崎[1] 林泓志 张涛 QIN Xuefeng;HOU Wenqi;LIN Hongzhi;ZHANG Tao(School of Civil Engineering,Central South University,Changsha 410075,China;General Contracting Company of China Construction No.5 Engineering Bureau,Changsha 410004,China;China Railway No.2 Engineering Group Co.,Ltd.,Chengdu 610031,China;The Investment Management Company of China Construction No.5 Engineering Division Co.Ltd.,Changsha 410004,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]中国建筑五局总承包公司,湖南长沙410004 [3]中铁二局集团有限公司,四川成都610031 [4]中建五局投资管理公司,湖南长沙410004

出　　处：《铁道科学与工程学报》2021年第10期2703-2714,共12页Journal of Railway Science and Engineering

基　　金：湖南省自然科学基金面上资助项目(2019JJ40385);中铁二局科技计划资助项目(ZTEJ-GXB(2019)085号)。

摘　　要：新建岗厦北综合交通枢纽为地下负3层大跨结构,中庭48 m×52 m范围为无柱区域,在全国尚属首例。该结构建造过程复杂,涉及多重体系转换。采用有限元仿真分析方法,模拟该结构体系转换过程,研究多重体系转换过程对结构力学行为的影响。研究结果表明:多重体系转换过程中,结构荷载主要通过层间结构柱传递,在相邻层间板和梁之间几乎没有再次传递分配;临时支撑卸载是最不利工况,相较于卸载前,负3层结构柱轴力增幅达90%,负1层钢梁和混凝土板受力状态变化也较为显著。不同临时支撑卸载方案对比结果表明,钢梁架设完成后即进行临时支撑卸载为合理时机,可使体系转换过程中结构受力状态变化平缓,且结构最终受力状态较原方案更为合理,尤其可显著降低中庭大跨无柱区域负1层混凝土板拉应力,降幅达14%。本文成果已应用于该工程,实际体系转换过程安全、可靠。The newly built Gangshabei comprehensive transportation hub is an underground three-floor large-span structure,and the 48 m×52 m atrium is a non-column area,which is the first case in China.The construction process of the structure is complicated and involves multiple system transformation.With the finite element simulation analysis method,the multiple system transformation process of the structure was simulated,and the influence of the system transformation process on the mechanical behavior of the structure was studied.Results show that in the process of multiple system transformation,the structural load is mainly transferred through the interlayer structural columns,and there is almost no re-transfer and distribution between adjacent interlayer slabs and beams;temporary support unloading is the most unfavorable condition,compared to the condition before unloading,the axial force of the structural columns at the minus three floor was increased by 90%,and the stress state of the steel girder and concrete slab at the minus one floor also was changed significantly.The comparison results of different temporary support unloading schemes show that it is a reasonable time to perform temporary support unloading after the erection of the steel girder completed,which can make the structural force state change smoothly during the system transformation process,and the final stress state of the structure is more reasonable than the original scheme.Especially,it can significantly reduce the tensile stress of the concrete slab at the minus one floor in the large-span non-column area of the atrium by up to 14%.The results have been applied to the Gangshabei comprehensive transportation hub project,and the actual system transformation process is safe and reliable.

关 键 词：大跨地下空间结构 体系转换 传力途径 临时支撑 力学行为 

分 类 号：TU9[建筑科学]