基于荷载⁃位移滞回曲线的建筑双梁⁃柱节点抗震性能分析

doi:1013229/j.cnki.jdxbgxb.20220233

摘要/Abstract

摘要：

为准确获取地震发生时建筑结构的变化特征，提高建筑抗震安全性，分析了建筑双梁-柱节点抗震性能。将地震破坏过程分为混凝土初裂、梁柱箍筋屈服、节点承载力达到最大限度、核心区域破坏4个阶段，设定建筑破坏标准，明确梁-柱节点的破坏形式；凭借混凝土强度、水平箍筋、梁端等因素对节点抗震性能产生的影响，设置加载过程中节点基本假设，分别计算双梁自身形变位移、柱变形导致的位移以及核心区变形位移，将3种位移相加，得到整体位移，构建荷载-位移模型。在实验分析中，利用荷载-位移滞回曲线研究节点退化刚度，实验结果表明，刚度随位移的增加逐渐下降；通过最大荷载特征值与延性系数，证明双梁-柱节点抗震性能高于单梁-柱节点；节点下核心区的抗震性能最弱，容易引起建筑形变，但通过增强混凝土强度可有效提高抗震性能。

关键词: 荷载?位移滞回曲线, 双梁?柱节点, 抗震性能, 核心区, 延性系数

Abstract:

The seismic performance of building double-beam-column joints is analyzed， in order to accurately obtain the changing characteristics of the building structure when earthquake occurs， and improve the seismic safety of the building. The seismic failure process is divided into four stages： initial concrete cracking， yield of beam column stirrups， maximum node bearing capacity， and core area failure. The building damage standard is set， and the damage form of beam-column joints is clarified； the seismic performance of joints is affected by factors such as concrete strength， horizontal stirrups， and beam ends. The basic assumptions of the nodes in the loading process are set， and the deformation displacement of the double beam itself， the displacement caused by the column deformation， and the deformation displacement of the core area are calculated separately， and the three displacements are added to obtain the overall displacement. In the experimental analysis， the load-displacement hysteresis curve is used to study the joint degradation stiffness. The experimental results show that the stiffness gradually decreases with the increase of the displacement； through the maximum load characteristic value and the ductility coefficient， it is proved that the seismic performance of the double beam-column joint is higher than that of the single beam-Column node； the seismic performance of the core area under the node is the weakest， which is easy to cause building deformation， but the seismic performance can be effectively improved by strengthening the concrete strength.

Key words: load displacement hysteretic curve, double beam column joint, seismic performance, core area, ductility coefficient

中图分类号:

TU391

邸振勇,杨新辉,林霄. 基于荷载⁃位移滞回曲线的建筑双梁⁃柱节点抗震性能分析[J]. 吉林大学学报(工学版), 2023, 53(7): 2061-2066.

Zhen-yong DI,Xin-hui YANG,Xiao LIN. Seismic performance analysis of building double beam column joints based on load displacement hysteretic curve[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(7): 2061-2066.

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试件部位	参数设置
上梁截面翼缘	250×25 mm
上梁截面腹板	150×20 mm
下梁截面翼缘	220×25 mm
下梁截面腹板	130×20 mm
圆钢管柱截面	380×20 mm

试件编号	最大荷载/kN			延性系数平均值
试件编号	屈服点	极限点	破坏点	延性系数平均值
双梁?柱节点1	45.2	55.7	47.9	3.52
双梁?柱节点2	44.8	62.1	48.4	3.52
单梁?柱节点1	33.1	44.2	22.5	2.18
单梁?柱节点2	34.9	41.3	21.7	2.18

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