|Table of Contents|

Axial compressive behavior of circular tubed steel reinforced concrete column-RC beam joint(PDF)

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

Issue:
2025年03期
Page:
65-78
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Axial compressive behavior of circular tubed steel reinforced concrete column-RC beam joint
Author(s):
NIE Shao-feng1;  LIU Ye-qing1;  CUI Jian-jun2;  WEN Bo3;  JIANG Xin1;  RAN Bo1
(1. School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. School of Land Engineering, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Beijing Huayu Engineering Co. Ltd., China Coal Technology and Engineering Group, Xi'an 710061, Shaanxi, China)
Keywords:
bridge engineering;  circular tubed steel reinforced concrete column;  axial compressive behavior;  finite element analysis;  joint of RC ring beam;  joint of steel tube with opening holes
PACS:
U443.22
DOI:
10.19721/j.cnki.1671-8879.2025.03.006
Abstract:
Experimental studies were conducted on the axial compressive behaviors of circular tubed steel reinforced concrete column-reinforced concrete(RC)beam joints of steel tube with opening holes and RC ring beam, respectively, and the compression failure characteristics, maximum bearing capacities, and load-displacement curves of specimens were obtained. Numerical analysis was carried out on axial compressive behaviors of specimens through ABAQUS, and the experimental results were compared to finite element analysis(FEA)results. On the basis of verifying the correctness of the finite element model, the influences of steel content, diameter-to-thickness ratio of steel tube, hole margin ratio and opening hole ratio of joint of steel tube with opening holes, as well as rebar ratio and width of joint of RC ring beam on the axial compressive behaviors of joints were analyzed in detail. The research results show that the shear failure or buckling failure occurs on the column of specimen, and the joint region is intact. The RC ring beam and joint of steel tube with opening holes have great compressive behavior. Joint regions are protected and constrained. The stiffnesses, maximum loads, and load-axial displacement curves obtained from experiment and FEA are basically consistent. The difference in the ultimate bearing capacity between FEA and experiment is within 5%, indicating the finite element model has high calculation accuracy and suitability for parametric analysis. The maximum load and ductility of specimen improve with the increase in the steel content and the decrease in the diameter-to-thickness ratio of steel tube. The steel content is proposed between 4%-10%. As the width of RC ring beam increases, the maximum load of specimen remains nearly constant, while its ductility improves to a certain extent. When the width of RC ring beam is larger than that of RC beam, the joint core region has good behavior. When the hole margin ratio of joint of steel tube with opening holes specimen alters, the maximum load of specimen does not show significant change. However, as the hole margin ratio increases from 11.1% to 15.0%, the post bearing capacity of specimen improves notably. Therefore, the hole margin ratio should be greater than 15.0%. As the opening hole ratio decreases, the maximum load and ductility of specimen both slightly improve. Additionally, to prevent the failure at the steel tube, the opening hole ratio should be less than 50%.5 tabs, 16 figs, 30 refs.

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Last Update: 2025-05-30