|Table of Contents|

Mechanism analysis of force transfer at joint of asymmetric V-shaped steel pylon and concrete base of cable-stayed bridge(PDF)

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

Issue:
2025年01期
Page:
148-156
Research Field:
桥隧结构
Publishing date:

Info

Title:
Mechanism analysis of force transfer at joint of asymmetric V-shaped steel pylon and concrete base of cable-stayed bridge
Author(s):
XIAO Yipeng;  ZHOU Chaoyang;  HE Chang;  CHEN Shijie;  LIU Yijiang
(School of Civil Engineering, Central South University, Changsha 410075, Hunan, China)
Keywords:
cable-stayed bridge;  steel-concrete joint;  finite element analysis;  interfacial stress;  force transfer mechanism
PACS:
U443
DOI:
10.19815/j.jace.2023.04133
Abstract:
In order to alleviate the stiffness steep change from the pylon column to the base, a local structural optimization method of setting U-shaped stiffeners in the box section at the steel pylon bottom was proposed and the finite element model was established. The stress of the concrete cap, base, steel anchor box and steel pylon bottom area were calculated. On the basis, the stress at the connection between the pylon bottom and bearing plate and the influence of the weld defects in the box were analyzed. The interfacial stress between the bearing plate and the concrete base was studied, and the contribution of each component to the internal force transfer of the joint was discussed. The results show that setting U-shaped stiffeners in the bottom box of the steel pylon can effectively reduce the peak stress. Under the typical most unfavorable load combination, the stresses of each part of the steel-concrete joint do not exceed the limit. Under the condition of minimum axial force and maximum bending moment, the weld between the column bottom panel, the rib plate and the bearing plate is almost under pressure and can meet the weld strength requirements. When there are quality defects in the welding inside the column bottom box, the stress in the nearby panel and bearing plate increases, but part of the pressure can still be transmitted at the connection between the rib plate and the bearing plate. There is no detachment risk between the bearing plate and the concrete base under two load conditions. The vertical pressure at the pylon bottom is mainly transmitted to the concrete directly by the bearing plate, while the shear force is mostly transmitted through the anchor box.

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Last Update: 2025-01-20