|Table of Contents|

Seismic performance analysis of prefabricated beam-column joints based on slot connections(PDF)

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

Issue:
2025年02期
Page:
16-26
Research Field:
建筑结构
Publishing date:

Info

Title:
Seismic performance analysis of prefabricated beam-column joints based on slot connections
Author(s):
ZHANG Min1; 2;  JIN Zhichao2;  CHEN Yihu3;  JIANG Hongmin4;  LU Dan5
Keywords:
slot connection;  prefabricated beam-column joint;  seismic performance;  experimental research
PACS:
TU375
DOI:
10.19815/j.jace.2023.08061
Abstract:
In order to simplify joint construction and prevent concrete pouring from being affected by excessive steel reinforcement in the joint area, a beam-column joint with slot connection was proposed. By conducting low cycle repeated loading tests, a cast-in-place joint was compared with two slot connection joints to study the seismic performance indicators such as hysteresis curve, skeleton curve, stiffness degradation, and energy dissipation capacity of each joint specimen. Based on the experiment, finite element analysis was conducted on each specimen using ABAQUS software, and parameter expansion analysis was performed on the thickness of the upper end plate of slot. The results show that the bearing capacity of the joint connected by C30 concrete pouring is close to that of the cast-in-place joint, but due to stress concentration on the upper end plate of the joint, arching occurs, causing damage to the concrete around the joint and increasing the slip between the steel bars and the concrete. Ultimately, this leads to significant shrinkage of the hysteresis curve, and the stiffness, energy dissipation, and other indicators are not as good as those of the cast-in-place joint. Due to the high compressive strength of the grouting material and the grouting material is in a triaxial compression state inside the slot, the ultimate compressive strength of the slot connection joint using high-strength grouting material will be significantly enhanced with the increase of confining pressure. The destructive effect on the grouting material caused by the deformation of the upper end plate of the slot is reduced, ensuring the coordinated work between the steel bars and grouting material. Its hysteresis curve is relatively full, and its stiffness and energy dissipation are also improved. Its seismic performance is comparable to that of cast-in-place joints, which can meet the needs of practical engineering. The simulated skeleton curve and the failure characteristics of the specimen are in good agreement with the experimental results. The thickness of the upper end plate of the slot can affect the initial stiffness and bearing capacity of the specimen.

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Last Update: 2025-03-20