余瑜^1,2，  谷军³
    （1 重庆大学土木工程学院，重庆400045；2 山地城镇建设与新技术教育部重点实验室（重庆大学），重庆400045；3 重庆市建设工程质量监督总站，重庆400018）

[摘要] 收集了13个梁柱节点在低周反复荷载作用下梁、柱、节点变形引起的梁外端挠度占总挠度的比例变化情况及其中4个试件的梁端荷载一节点剪切变形滞回曲线，从中得出影响节点剪切变形的几个主要因素：轴压比、剪压比、节点配箍特征值、循环次数。在对试验所得的梁端荷载．剪切变形滞回曲线的特征、走向、趋势进行分析的基础上，提出了节点剪切变形模型。该模型考虑了混凝土强度、轴压比、剪压比、节点配箍特征值、循环次数五个影响因素。经验证梁端荷载．位移滞回规律模拟程序可较好地模拟节点的受力规律及抗震性能。
[关键词] 梁柱节点；剪切变形；滞回曲线
中图分类号：TU312    文献标识码：A  文章编号：1002-848X(2011) S2-0162-06

Shear deformation model of concrete frame joint subjected to low cyclic reversal load
Yu Yu^1,2, Gu Jun³
(1 School of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 Key Laboratory of New Technology for Construction of Cities in Mountain Area( Chongcpng University), Ministry of Education, Chongqing 400045, China; 3 Chongqing Construction Project Quality Supervision Station, Chongqing 400018, China)

Abstract: Beam-end displacements proportion of 13 beam-column subassemblies changes that were caused by the beam deformation, column deformation, joint deformation and 4 beam-ends load shear deformation hysteresis loops were collected. According to the test results, the factors of effecting shear deformation, such as axial compression ratio, shear compression ratio, stirrup characteristic value and cycle number were proposed. Based the characters, trends, change rules of the load-shear deformation hysteresis loop in the test, the joint'8 shear deformation model under low cyclic reversal load was proposed. In the model, axial compression ratio, shear compression ratio, stirrup characteristic value and cycle number were considered. It is proved that the simulation program of hysteretic characteristics of beam-column subassemblies have the capacity of simulating successfully the joint's seismic behaviour.
Keywords: concrete frame joint; shear deformation; hysteresis loop