人工消能塑性铰装配式钢筋混凝土框架结构抗震性能

Seismic performance of precast-reinforced concrete frames with artificial dissipative plastic hinges

针对装配式钢筋混凝土框架结构抗震性能不足的问题,本文提出了一种新型节点构造措施。人工消能塑性铰,即梁、柱构件在梁端采用机械铰及附加消能钢板连接的构造,通过附加消能钢板弯曲耗能,提高结构的抗震性能。本文以一个3层人工消能塑性铰结构为例,使用ABAQUS软件建立有限元模型,选用4条地震波对模型进行非线性动力时程分析,模拟结构在中震、大震下的响应。分析结果表明:采用人工消能塑性铰的框架结构在中、大震作用下,可使损伤主要集中在人工消能塑性铰部分,整体结构的层间位移角减小,屈服机制为完全梁铰模式或部分梁柱铰整体型,使基于人工消能塑性铰的框架结构具有良好的抗震性能。

Innovative joint construction methods have been introduced to overcome the shortcoming of precast-reinforced concrete frames.Meanwhile,artificial dissipative plastic hinges(ADPHs)have been presented to improve the seismic performance of structures by adding dissipative plates,which consume energy through plastic bending deformation.ADPHs are structures that adopt beam-column connections with a mechanical hinge and a pair of detachable replaceable dissipative steel plates at the beam ends.In this study,a three-story ADPH structure was taken as an example,and its response under moderate and intense earthquake conditions was simulated by establishing a finite element model using ABAQUS.Then,four seismic waves were selected to perform nonlinear dynamic time history analyses.Analysis results indicate that the frame structure with ADPH can control the damage at the ADPH to reduce the inner-story drift ratio of the entire structure.The damage mode of the ADPH frame structure is either a full beam-hinge mechanism or a partial beam-column hinge mechanism.Furthermore,the ADPH frame structure has excellent seismic-resisting performance.