【摘要】 为研究局部应用超高性能混凝土(ultra-high performance concrete, UHPC)的框架结构的抗震性能，以通用有限元软件MASC.MARC为平台，采用可考虑UHPC滞回本构的纤维梁单元，对1栋6层3×4跨UHPC-混凝土框架结构模型(简称“UHPC框架”)和1个钢筋混凝土框架对照模型(简称“RC框架”)进行非线性动力时程分析，研究结构在8度抗震设防烈度地震作用下的位移响应、最大层间位移角、塑性铰发展及材料应力应变等抗震性能。研究表明：UHPC框架表现出更好的变形性能，其x方向最大顶点位移比RC框架小约38%;在8度罕遇地震作用下，UHPC框架的最大层间位移角控制能力显著优于RC框架结构，其最大层间位移角比RC框架小约33%;UHPC框架塑性铰的分布数量明显小于RC框架，且多集中在梁端；UHPC的受拉能力可显著减小纵筋拉应变的发展，且UHPC框架的首层柱脚纵筋应变小于首层梁端的，使得UHPC框架更有利于满足“强柱弱梁”的抗震需求。更多还原

【Abstract】 To explore the seismic performance of frame structural system with local application of UHPC, this paper adopted the fiber beam element that can consider the hysteretic constitutive of UHPC and carried out the nonlinear dynamic time-history analysis of a 6-story UHPC-concrete frame structure model(hereinafter referred to as UHPC frame) and a reinforced concrete frame model(hereinafter referred to as RC frame) under earthquake of 8 seismic intensity by MASC.MARC software. Seismic behaviors in terms of displacement response, maximum inter-story drift ratio, plastic hinge development law and material response were comprehensively investigated and compared. The results show that UHPC frame exhibits better deformation performance, the maximum vertex displacement of UHPC frame is 38% smaller than that of RC frame. The control ability of the maximum inter-story drift ratio of UHPC frame is significantly better than that of RC frame structure even under the 8-degree rare earthquake. Specifically, the maximum inter-story drift ratio of UHPC frame is 33% smaller than that of RC frame.The number of plastic hinges in UHPC frame is significantly smaller than that in RC frame, and most of them are concentrated at the beam end. The tensile capacity of UHPC can significantly reduce the development of tensile strain of longitudinal reinforcement, and the response of longitudinal reinforcement at the column foot is smaller than that of the beam end, which is more conducive to meet the seismic demand of “strong column and weak beam”.更多还原