雄安站半埋入式型钢混凝土柱脚设计及其受力性能研究  

Research on design and mechanical performance of semi-embedded steel reinforced concrete column foot of Xiong’an Railway Station

作　　者：宋志文 SONG Zhiwen(China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]中国铁路设计集团有限公司,天津300308

出　　处：《建筑结构》2021年第24期35-38,50,共5页Building Structure

基　　金：中国国家铁路集团有限公司系统性重大项目:京津冀地区重点客站关键技术研究(P2018G049)。

摘　　要：雄安站站房采用型钢混凝土柱,柱距、柱截面大。按照传统埋入式柱脚设计方法,型钢在承台中埋深过大,柱下承台厚度过大,基坑需要开挖大量的土方工程。针对以上设计难题,经过反复比较论证,采用一种新型的半埋入式柱脚,型钢埋入约1.35倍截面高度,采用双向设置靴梁的方式来解决柱脚弯矩传递给基础的问题,同时减小了承台厚度。通过有限元仿真分析及缩尺模型试验,研究了该半埋入式柱脚的受力性能。研究结果表明,该半埋入式柱脚在设计荷载作用下基本处于弹性工作阶段,抗弯承载力满足设计要求,且具有足够的安全储备。Xiong’an Railway Station building adopts steel reinforced concrete columns with large column spacing and column cross-section.According to traditional buried column foot design method,the section steel is buried too deep in the cap and the thickness of the cap under the column is too large,and the foundation pit needs to be excavated a lot of earthwork.In response to the above design problems,after repeated comparisons and demonstrations,a new type of semi-embedded column foot was used,with the section steel embedded about 1.35 times the section height,and the bidirectional setting of boot beams was used to solve the problem of the bending moment of the column foot being transmitted to the foundation.At the same time,the thickness of the column cap was reduced.Through finite element simulation analysis and scale model test,the mechanical performance of the semi-embedded column foot was studied.Research result shows that the semi-embedded column foot is basically in an elastic working stage under the design load,the flexural bearing capacity meets the design requirements,and has sufficient safety reserves.

关 键 词：雄安站 柱脚 靴梁 有限元仿真分析 缩尺模型试验 

分 类 号：TU392.1[建筑科学—结构工程]