|Table of Contents|

Research on Internal Force of Crossbeam in Curved Steel-concrete Composite Twin I-girder Bridge(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
63-73
Research Field:
结构工程
Publishing date:

Info

Title:
Research on Internal Force of Crossbeam in Curved Steel-concrete Composite Twin I-girder Bridge
Author(s):
YAN Xin-kai1;  LIU Yong-jian1; 2;  XING Zi-han1;  FENG Bo-wen1;  CHEN Xiao1
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Research Center of Highway Large Structure Engineering on Safety of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
curved steel composite twin I-girder bridge;  crossbeam;  Vlasov's thin-wall structure theory;  numerical simulation
PACS:
TU311
DOI:
10.19815/j.jace.2022.02067
Abstract:
In order to study the influence of the longitudinal warpage deformation of the main beam web on the internal force of the crossbeam, on the basis of the existing crossbeam frame model, the distribution laws of physical parameters such as warpage deformation and structural torsion angle of a simply supported curved steel-concrete composite twin-I girder bridge under concentrated load were obtained through the Vlasov's thin-wall structure theory. The deformation coordination relationship between the main beam web and the crossbeam was used to analyze the longitudinal deformation of the crossbeam. The internal force composition of the crossbeam and the normal stress distribution law of the section were obtained and verified by the finite element analysis. The results show that the positive stress distribution law of the crossbeam based on Vlasov's thin-wall structure theory is basically consistent with the law obtained from finite element calculation. The crossbeam positive stresses near the loading point are dominated by the “vertical bending effect”, and the “web deformation inconsistency effect” of the crossbeam near the bearing section is greater than that of the crossbeam near the loading point section. The warpage deformations of the web on both sides of the loading point section are in opposite directions, which leads to the opposite distribution of the crossbeam positive stress. The distribution law of stress generated by the crossbeam vertical bending deformation is similar to that of the main beam bending moment, and distribution law of the stress generated by the longitudinal bending deformation is similar to that of the torsion rate.

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Last Update: 2022-09-30