某新型梁柱节点的装配式钢筋混凝土框架结构基于性能的抗震设计研究

Performance-based Seismic Design of Fabricated Reinforced-Concrete-Frame Structures with New Beam-Column Joints

在一种新型无黏结预应力装配式混凝土梁柱框架节点抗震性能试验基础之上,使用基于位移的抗震设计方法对新型框架节点的无黏结预应力装配式钢筋混凝土框架结构进行整体抗震设计研究。首先使用有限元软件sap2000进行预应力三维结构设计并建立相应的有限元模型,同时建立该梁柱节点的梁恢复力模型,进而实现自定义塑性铰本构关系研究该装配式框架结构。使用pushover分析去表征结构的抗震性能,对比研究不同目标位移下的相应性能水平要求。通过施加Y方向均匀分布荷载对结构进行弹塑性推覆分析,对结构的层间位移角、破坏机制进行分析讨论。结果表明:按照“功能良好”“生命安全”“防止倒塌”三水平的设计均达到预期结果,各层层间位移角和薄弱层的性能均能满足规范的相应要求。并选用三条地震波对结构进行弹塑性动力时程分析,表明基于该新型梁柱节点的装配式结构在基于位移的抗震设计中可以较好满足相关抗震性能水平要求。

In this study,we used a displacement-based seismic design method to test the seismic performance of a new type of unbonded prestressed prefabricated concrete beam-column frame joint and to investigate the overall seismic design of an unbonded prestressed prefabricated reinforced-concrete-frame structure with new beam-column joints.First,we used sap2000 finite element software to design a prestressed three-dimensional structure and establish a corresponding finite element model.In addition,we established a model of the beam restoring force of the beam-column joint to determine its constitutive relation to the self-defined plastic hinge.We then performed a pushover analysis to characterize the seismic performance of the structure and compared it with the corresponding performance level requirements under different target displacements.Based on the results of the elastic-plastic pushover analysis of the structure with uniform load in the Y direction,we analyze and discuss the story drift ratio and failure mechanism of the structure.The results show that according to a design featuring“good function,”“life safety,”and“prevention of collapse,”the expected results are achieved and the story drift ratio and weak-story performance can meet the corresponding code requirements.Three seismic waves are selected to analyze the elastic-plastic dynamic time history of the structure,the results of which indicate that the structure fabricated using the new beam-column joint can meet the relevant requirements regarding seismic performance in the displacement-based seismic design.