|Table of Contents|

Shear lag effect of U-shaped girder of rail transit considering load types and structural parameters(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2024年2期
Page:
57-67
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Shear lag effect of U-shaped girder of rail transit considering load types and structural parameters
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)
Keywords:
bridge engineering;  U-shaped girder;  shear lag;  load type;  structural parameter;  effective width
PACS:
U441
DOI:
10.19721/j.cnki.1671-8879.2024.02.006
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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Last Update: 2024-03-01