摘要
为提升装配式RC框架结构的可恢复性能,提出了一种带有可控塑性铰的自复位装配式RC梁柱节点(PJ-CPH),其中可控塑性铰是由机械铰、摩擦耗能装置和碟簧自复位装置组合而成。将碟簧自复位装置简化为非线性弹簧元件,摩擦耗能装置简化为蜗簧元件和阻尼元件串联,给出了PJ-CPH的力学模型,建立了PJ-CPH的恢复力模型。采用ABAQUS软件对5个不同设计参数的PJ-CPH在低周往复荷载作用下的滞回性能进行模拟,结果表明:PJ-CPH的滞回曲线呈现“旗帜形”特征,提出的恢复力模型与有限元计算结果吻合良好,能够较好预测PJ-CPH的滞回特性;碟簧自复位装置提供的复位弯矩与摩擦耗能装置的启动弯矩平衡时,摩擦片残余弹性扭转变形无法完全自复位;在摩擦耗能装置启动弯矩不变的情况下,当复位率大于1.00时,提高复位率并不能减小梁端残余位移,反而会增加残余位移。
To improve the resilience performance of the prefabricated RC frame structure, a self-centering prefabricated reinforced concrete beam-column joint with a controlled plastic hinge(PJ-CPH) was proposed. A controllable plastic hinge is a novel connecting form composed of the mechanical hinge, the device of friction energy dissipation and the device of disc spring self-centering. The device of disc spring self-centering was simplified as a nonlinear spring element. The device of friction energy dissipation was simplified as a worm spring element and damping elements in series. A hysteretic model of the PJ-CPH was proposed. The ABAQUS finite element software was employed to simulate the hysteretic behavior of the PJ-CPH under low cyclic loading. Five solid numerical models of PJ-CPH were established. The calculation results of the hysteretic model were compared by simulating results. The results indicate that the PJ-CPH presents a flag-shaped hysteretic response. The proposed hysteretic model is in good agreement with the finite element calculation results. When the centering moment provided by the disc spring self-centering device is balanced with the activated moment of the friction energy dissipation device, the residual elastic torsional deformation of the friction plate cannot be eliminated. When the activated bending moment of the friction energy dissipation device is unchanged and the centering rate is greater than 1.00, the residual displacement is increased rather than reduced with the increasing centering rate.
作者
马立成
史庆轩
王秋维
王斌
MA Licheng;SHI Qingxuan;WANG Qiuwei;WANG Bin(State Key Laboratory of Green Building in Western China,Xi’an University of Architecture&Technology,710055 Xi’an,China;School of Civil Engineering,Xi’an University of Architecture&Technology,710055 Xi’an,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,710055 Xi’an,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第3期70-78,共9页
Journal of Building Structures
基金
国家自然科学基金项目(52178505,51878540)。
