盖挖逆作地铁车站明暗双牛腿结构抗剪性能研究

张林; 吴云

doi:10.3973/j.issn.2096-4498.2020.09.006

隧道建设 >

2020 , Vol. 40 >Issue 9: 1285 - 1291

DOI: https://doi.org/10.3973/j.issn.2096-4498.2020.09.006

研究与探索

盖挖逆作地铁车站明暗双牛腿结构抗剪性能研究

张林 ,
吴云

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（1. 中铁二十局集团第四工程有限公司，山东青岛 266061； 2. 内蒙古科技大学土木工程学院，内蒙古包头 014010）

张林（1972—），男，陕西汉中人，1991年毕业于石家庄铁道学院，工业与民用建筑专业，本科，高级工程师，现主要从事土建工程施工与管理工作。E-mail: zxbjtu@126.com。

网络出版日期: 2020-10-10

基金资助

内蒙古自然科学基金项目（2017MS(LH)0523）

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Investigation into Shearing Capacity of VisibleConcealed Twincorbel Used in a Metro Station Excavated by CutandCover TopDown Method

ZHANG Lin ,
WU Yun

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(1. No.4 Engineering Corporation Limited of CR20G, Qingdao 266061, Shandong, China; 2. School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China)

Online published: 2020-10-10

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摘要

为解决内蒙古自治区呼和浩特市盖挖逆作地铁车站钢管混凝土柱与后浇钢筋混凝土梁明暗双牛腿节点的设计难题，针对盖挖逆作地铁车站，提出一种新型的明暗双牛腿式钢管混凝土梁节点形式。通过ABAQUS模拟分析和模型试验验证，对不同设计参数条件下结构的抗剪性能进行研究。分析结果表明： 1)环形牛腿肋板与钢管壁之间的有效焊缝长度为影响牛腿结构抗剪承载力的主要参数，通过调节有效焊缝长度，可以明显改善牛腿结构的力学性能； 2）为确保剪力的有效传递，上环板穿心量宜取值为钢管柱直径的8%； 3）在实际工程中，梁柱节点处剪力较大时，可采用明暗双牛腿，其具有较高的承载力，力学性能好，具有较广泛的工程应用前景。

关键词： 地铁车站; 盖挖逆作法; 明暗双牛腿; ABAQUS; 抗剪承载力

本文引用格式

张林 , 吴云 . 盖挖逆作地铁车站明暗双牛腿结构抗剪性能研究[J]. 隧道建设, 2020 , 40(9) : 1285 -1291 . DOI: 10.3973/j.issn.2096-4498.2020.09.006

Abstract

The design of joints of concretefilled steel tubular (CFST) columnreinforced concrete (RC) beam with visibleconcealed twincorbel in the metro station excavated by cutandcover topdown method in Hohhot, Inner Mongolia is of great significance. As a result, a new type of CFST joint with visibleconcealed twincorbel is put forward, which is analyzed by simulation software ABAQUS and model test. Meanwhile, analysis is made on the key design parameters of the joint. The results show that: (1) The effective weld length between the annular corbel rib plate and the steel pipe wall is the main parameter affecting the shear resistance of the node, and by adjusting which the mechanical properties of the joint can be significantly improved. (2) In order to ensure the effective transfer of shear force, 8% of the diameter of steel tube column should be taken as the appropriate value. (3) When the shear force at the beam column joint is large, the visibleconcealed twincorbel can be used, which has high bearing capacity and excellent mechanical properties as well as a wide range of engineering application prospects.

Key words： metro station; cutandcover topdown excavation method; visibleconcealed twincorbel; ABAQUS; shearing capacity

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