|Table of Contents|

Study on seismic behavior of monolithic precast concrete frame U-shaped beam-column joints(PDF)

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

Issue:
2025年06期
Page:
22-34
Research Field:
建筑结构
Publishing date:

Info

Title:
Study on seismic behavior of monolithic precast concrete frame U-shaped beam-column joints
Author(s):
JIANG Shengxue1;  XU Junlin1;  TANG Mingsheng2;  RUAN Zixing2;  GU Qian2
(1. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China; 2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, Hubei, China)
Keywords:
U-shaped beam-column joint;  non-contact lap splice;  seismic behavior;  quasi-static test;  numerical simulation
PACS:
TU375.4
DOI:
10.19815/j.jace.2024.05039
Abstract:
To reduce the congestion problem of beam-column joints with hooked beam bottom longitudinal rebars, a monolithic precast concrete frame U-shaped beam-column joint(UBCJ)was proposed. The bottom longitudinal rebars and waist rebars of U-shaped beam did not protrude from the beam end, and they were connected to additional rebars and additional waist rebars set up in the U-shaped groove through non-contact lap splice to replace the bottom longitudinal rebars and waist rebars directly inserted into the core area of the joint for load transfer. To investigate the seismic behavior of the UBCJs, quasi-static tests were conducted on two full-scale beam-column joint specimens, including one UBCJ specimen and one cast-in-place comparison joint specimen. A refined finite element model of the new joint was also developed in ABAQUS, and its accuracy was verified by compared with the experimental results. The results show that all specimens failed due to the “beam hinge” mechanism. The seismic behavior of the UBCJ specimen is not weaker than that of the cast-in-place comparison joint specimen. The non-contact lap splice load transfer is feasible. For the cast-in-place comparison joint specimen, the stress in the bottom of beam is carried by the bottom longitudinal rebars, while in the UBCJ specimen, the stress is carried by the additional rebars. Under the condition of guaranteeing the bonding performance of rebars and concrete, changing the non-contact lap splice length of the additional rebars and the strength grade of the post-poured concrete has no significant impact on the bearing capacity of the UBCJs, and increasing the diameter of the additional rebars can effectively improve the bearing capacity of the UBCJs.

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Last Update: 2025-11-25