[1]占玉林,李嘉鑫,张秉鹤,等.考虑荷载类型及结构参数的轨道交通U形梁剪力滞效应[J].长安大学学报(自然科学版),2024,44(2):57-67.[doi:10.19721/j.cnki.1671-8879.2024.02.006]
　ZHAN Yu-lin,LI Jia-xin,ZHANG Bing-he,et al.Shear lag effect of U-shaped girder of rail transit considering load types and structural parameters[J].Journal of Chang’an University (Natural Science Edition),2024,44(2):57-67.[doi:10.19721/j.cnki.1671-8879.2024.02.006]
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考虑荷载类型及结构参数的轨道交通U形梁剪力滞效应()
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长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

卷:
第44卷
期数:
2024年2期
页码:
57-67
栏目:
桥梁与隧道工程
出版日期:
2024-03-01

文章信息/Info

Title:
Shear lag effect of U-shaped girder of rail transit considering load types and structural parameters
文章编号:
1671-8879(2024)02-0057-11
作者:
占玉林1; 2; 李嘉鑫1; 张秉鹤3; 张 程1; 邵俊虎1; 4
(1. 西南交通大学 土木工程学院,四川 成都 610031; 2. 西南交通大学 土木工程材料研究所,四川 成都 610031; 3. 青岛市地铁八号线有限公司,山东 青岛 266001; 4. 成都大学 建筑与土木工程学院,四川 成都 610106)
Author(s):
ZHAN Yu-lin1; 2;  LI Jia-xin1;  ZHANG Bing-he3;  ZHANG Cheng1;  SHAO Jun-hu1; 4
(1. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 2. Institute of Civil Engineering Materials, Southwest Jiaotong University, Chengdu 610031, Sichuan, China; 3. Qingdao Metro Line 8 Co. Ltd., Qingdao 266001, Shandong, China; 4. School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, Sichuan, China)
关键词:
桥梁工程;  U形梁;  剪力滞;  荷载类型;  结构参数;  有效宽度
Keywords:
bridge engineering;  U-shaped girder;  shear lag;  load type;  structural parameter;  effective width
分类号:
U441
DOI:
10.19721/j.cnki.1671-8879.2024.02.006
文献标志码:
A
摘要:
针对U形梁属于开口构件,其剪力滞效应不能直接套用成熟的闭口箱梁剪力滞效应的计算方法,研究了轨道交通U形简支梁的剪力滞效应。以青岛某地铁为背景,分别建立空间实体有限元模型和平面杆系模型。研究了3种不同类型荷载作用下U形梁剪力滞效应的纵横向分布规律; 分析了4种结构参数变化下U形梁的剪力滞系数变化情况; 计算了U形梁的有效宽度并与中国现行规范比较。研究结果表明:列车荷载是影响U形梁剪力滞系数纵向分布的主要因素,列车车轮作用位置处剪力滞效应明显; 在一期恒载和二期恒载分别作用下均呈现出简支梁跨中区段剪力滞效应较小,支座区段剪力滞效应明显的规律。在剪力滞效应的横向分布中,3种荷载分别作用下U形梁道床板处的剪力滞效应均较腹板位置处明显。影响U形梁剪力滞效应增大的主要结构因素是梁高和底板宽度,其中梁高的影响显著,增加底板厚度能有效降低U形梁的剪力滞系数,而改变腹板厚度对剪力滞系数的影响甚微。目前中国规范为考虑桥梁剪力滞效应而采用的箱梁有效宽度计算不适用轨道交通U形梁,在考虑荷载类型和结构参数影响的基础上,建立的U形梁有效宽度修正计算公式与有限元模拟结果吻合良好。研究成果可为实际工程中U形梁的应力计算与钢筋配置提供参考。
Abstract:
Aimed at U-shaped girder belongs to open structure, its shear lag effect can not be directlyapplied to the mature calculation method of closed box girder shear lag effect, the shear lag effect of simply-supported U-shaped girder of rail transit was studied. Based on the backgroundof a subway in Qingdao, the finite element model of space entity and the plane bar model wereestablished respectively. The longitudinal and transverse distribution of shear lag effect ofU-shaped girder under three different load types were studied. The variation of shear lagcoefficient of U-shaped girder with four kinds of structural parameters were analyzed. Theeffective width of U-shaped girder were calculated and compared with the current domesticspecifications. The results show that train load is the mainfactor affecting the longitudinal distribution of shear lag coefficient of U-shaped beam, and theshear lag effect is obvious at the position of train wheels. Under the action of the first phase andthe second phase of the dead load, the shear lag effect of the simply supported girder is small inthe middle section and obvious in the support section. In the transverse distribution of shear lageffect, the shear lag effect at the bed plate of U-shaped girder is more obvious than that at theposition of web plate under the action of three kinds of loads respectively. The main structuralfactors influencing the increase of shear lag effect of U-shaped girder are beam height and floorwidth, among which the influence of beam height is significant. Increasing the thickness of the bottom plate can effectively reduce the shear lag coefficient of theU-shaped girder, but changing the web thickness has little effect. Bycomparison and analysis, the current specifications for calculating the effective width of boxgirder are not suitable for calculating the effective width of U-shaped girder in rail transit. The effective width correction formulas of U-shaped girder is established on the basis ofconsidering the influence of load type and structural parameters, and it is in good agreement withthe finite element simulation results. The results can provide reference for stresscalculation and reinforcement configuration of U-shaped girder in practical engineering.3 tabs, 13 figs, 25 refs.

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备注/Memo

备注/Memo:
收稿日期:2023-10-13
基金项目:国家自然科学基金项目(52278220,51878564); 四川省科技计划项目(2021JDTD0012);
青岛市市政工程设计研究院有限责任公司科研项目(M8-ZX-2018-029)
作者简介:占玉林(1978-),男,湖北罗田人,教授,博士研究生导师,E-mail:yulinzhan@swjtu.edu.cn。
更新日期/Last Update: 2024-03-01