|Table of Contents|

Experimental study of mechanical characteristics of assembled concrete-filled steel tube brace(PDF)

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

Issue:
2025年05期
Page:
55-65
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study of mechanical characteristics of assembled concrete-filled steel tube brace
Author(s):
SHEN Peiwu1; 2;  OUYANG Dong3
(1. Wuhan Metro Group Co., Ltd., Wuhan 430070, Hubei, China; 2. School of Civil and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China; 3. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China)
Keywords:
assembled brace;  concrete-filled steel tube column;  flange joint;  uniaxial compression;  four-point bending
PACS:
TU375
DOI:
10.19815/j.jace.2024.02015
Abstract:
In order to study the mechanical characteristics of assembled concrete-filled steel tube brace, two groups of concrete-filled steel tube column specimens and three groups of flange joint specimens were designed. The uniaxial compression model test and numerical simulation of the column specimens and the four-point bending model test and numerical simulation of the joint specimens were carried out respectively. The economic index and carbon emission index were proposed to analyze the economic advantage and carbon emission advantage of assembled concrete-filled steel tube brace. The results show that tensile cracks appear in the end concrete and the steel tube at the end is buckled when the column specimen is destroyed. The transverse deformation of concrete is obviously inhibited by steel tube, and the increase of concrete thickness prolongates the compaction deformation stage and increases the residual strength. The damage areas are mainly concentrated on the tension side of stiffeners and the connected flange plates when joint specimens reach failure. The bottom bolts are subjected to great tensile stress in the deformation process of joint specimens, and reasonable design of joint type and loading position can effectively improve the bearing capacity of joint specimens. The numerical test result of each specimen is consistent with the model test result. On the basis of meeting design requirement, the combination form of “column specimen 1 and joint specimen 3 ”shows a lower operating cost, while the combination form of “column specimen 1 and joint specimen 2” shows a higher bearing capacity. Compared with assembled steel tube brace and cast-in-place steel-concrete brace, the economic advantage and carbon emission advantage of assembled concrete-filled steel tube brace become more obvious with the increase of usage count.

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Last Update: 2025-09-25