对拉钢筋对管幕预筑结构偏压构件受力性能影响研究

宋玉香; 郑永翔; 张艳青; 许伯宁; 刘勇

doi:10.3973/j.issn.2096-4498.2024.06.005

隧道建设 >

2024 , Vol. 44 >Issue 6: 1174 - 1183

DOI: https://doi.org/10.3973/j.issn.2096-4498.2024.06.005

研究与探索

对拉钢筋对管幕预筑结构偏压构件受力性能影响研究

宋玉香 ,
郑永翔 ,
张艳青 ,
许伯宁 ,
刘勇

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（石家庄铁道大学土木工程学院，河北石家庄 050043）

第一作者简介：〖ＨＴ６ＳＳ〗宋玉香（1970—），女，河南焦作人，2015年毕业于西南交通大学,土木工程专业，博士,教授,现主要从事隧道衬砌安全度检算与围岩稳定性等教学与科研工作。E-mail: songyuxiang36262@163.com。

网络出版日期: 2024-07-12

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Effects of Transverse Reinforcement on Mechanical Performance of Eccentric Compression Members in Pipe Roof Prefabricated Structures

SONG Yuxiang ,
ZHENG Yongxiang ,
ZHANG Yanqing ,
XU Boning ,
LIU Yong

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(School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China)

Online published: 2024-07-12

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摘要

为研究对拉钢筋的直径及布设位置对管幕预筑结构偏压性能的影响，设计3根设置对拉钢筋和3根不设置对拉钢筋的管幕预筑结构构件，并进行3种不同偏心距的室内加载试验，重点考察构件的破坏形态、荷载－挠度关系和极限承载力；建立与试验对应的数值模型，通过计算结果和试验结果的对比验证模型的可靠性，并得到构件极限承载力随对拉钢筋直径及布设位置的变化规律。研究表明： 1)在管幕预筑结构偏压构件中设置对拉钢筋连接件能有效提高钢管幕的受力参与程度，增强钢板与混凝土的组合作用，从而提高构件的承载能力和变形能力。2)构件的极限承载力随对拉钢筋直径的增大而增大。3)对拉钢筋的布置位置对结构的强度及刚度影响较小，在小偏心受压条件下布置在构件变截面最大跨度、大偏心受压条件下布置在构件变截面与平截面交接处时，构件的极限承载力相对更佳。

关键词： 管幕预筑结构; 连接件; 对拉钢筋; 偏压构件; 数值模拟; 承载力

本文引用格式

宋玉香 , 郑永翔 , 张艳青 , 许伯宁 , 刘勇 . 对拉钢筋对管幕预筑结构偏压构件受力性能影响研究[J]. 隧道建设, 2024 , 44(6) : 1174 -1183 . DOI: 10.3973/j.issn.2096-4498.2024.06.005

Abstract

Three pipe roof-prefabricated structural members with varying configurations of transverse reinforcement bars are designed to conduct laboratory loading tests under three levels of eccentricity. The investigation focuses on the failure modes, load-deflection relationships, and ultimate bearing capacities of these members. Subsequently, finite element models that replicate the tests are developed to validate the reliability of these models by comparing the computational results with the experimental outcomes. This comparison elucidates the influence of the diameter and placement of the transverse reinforcement on the ultimate bearing capacity. The findings reveal: (1) Transverse reinforcement connectors, when arranged in eccentric compression members of pipe roof prefabricated structures, significantly enhance the stress distribution within the steel pipe curtain and improve the integration of steel plates with concrete, thereby augmenting both the load-bearing and deformation capacities of the members. (2) The ultimate bearing capacity of the structure escalates with an increase in the diameter of the transverse reinforcement. (3) Although the placement of the transverse reinforcement has a minimal impact on the strength and stiffness of the structure, the optimal bearing capacity is achieved when the reinforcement is positioned at the largest span of the variable section under conditions of minor eccentric compression and at the junction between the variable and flat sections under conditions of significant eccentric compression.

Key words： pipe roof prefabricated structure; connector; transverse reinforcement; eccentric compression members; numerical simulation; bearing capacity

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