【作者】 汤磊；

【导师】 郭正兴；

【作者基本信息】 东南大学 ， 土木工程建造与管理， 2016， 博士

【摘要】 随着建筑行业的转型升级,作为建筑业发展重要方向的建筑工业化逐渐成为行业关注与研究热点,装配式混凝土结构则是建筑工业化的重要内容。由于在我国中、高层建筑尤其是建设需求量极大的住宅建筑中大量采用剪力墙结构,因此,装配式混凝土剪力墙结构成为我国当前发展重点,并形成了多种代表性的装配式混凝土剪力墙结构技术体系。基于国外混合装配系统,为适应我国“等同现浇”理念,提出了新型“等同现浇”混合装配式混凝土剪力墙(Emulative hybrid shear wall system,以下简称EHSW),通过集成后张无粘结预应力技术、浆锚钢筋局部无粘结技术以及扣接封闭箍筋技术,以期解决既有的装配式混凝土剪力墙与现浇剪力墙相比存在的开裂较早、混凝土破坏相对集中等问题。为验证并探讨EHSW的抗震性能,本文针对性地开展了系列模型试验、有限元模拟及理论分析工作。论文的主要工作及成果如下：(1)对8片足尺EHSW模型和1片现浇对比模型开展了低周反复荷载加载试验,模型设计中考虑了预应力筋面积、预应力筋初始预应力、浆锚钢筋无粘结长度以及轴压比参数的变化,系统分析了模型的破坏形态、承载力、刚度、延性、耗能、残余变形等抗震性能指标,探讨了各设计参数对EHSW模型抗震性能的影响规律。(2)基于试验结果,采用有限元分析软件ABAQUS建立其有限元模型,并将分析结果与试验结果对比以验证有限元模型对试验结果的再现性。并基于有限元模型,通过参数分析,将试验未考虑的参数取值进行补充分析,进一步验证或扩展试验得到的各设计参数对EHSW抗震性能的影响规律。(3)基于既有受弯构件计算理论,探讨EHSW模型在开裂、屈服、极限等关键阶段或受力特征点的荷载与刚度计算方法。将初步计算结果与试验结果对比,根据参数影响规律的结论,采用数值拟合法,将对各强度、刚度理论解影响敏感的参数考虑进理论计算公式中,最终得出适用于EHSW、且与试验数据吻合良好的强度与刚度修正计算方法。(4)基于建立的EHSW模型强度与刚度修正计算方法,分析EHSW模型试验滞回曲线与骨架曲线的形状特点,提出EHSW四折线骨架曲线数学模型,并建立其恢复力数学模型。通过与试验曲线的对比,建立的四折线模型与恢复力模型可较好地反映EHSW在水平荷载作用下受力全过程的荷载-位移特性与滞回特性。通过上述试验研究与理论分析工作,对EHSW的抗震性能有了较为深入的了解,并得到了可行的设计计算方法,为EHSW后续进一步研究及工程应用奠定了数据与理论基础。更多还原

【Abstract】 Building industrialization, as the important development direction of building industry, has become the focus of attention of the industry along with the transformation and upgrading of building industry. The precast concrete structure is an important content in building industrialization. With regard to the abundant applications of shear wall structures in moderate- and high- rise building in our country, especially in the residential housing under heavy demand, precast concrete shear wall structure has been the developing emphasis and several typical precast concrete shear wall technologies have been put forward.In order to comply with the design concept of emulating, based on the hybrid system, Emulative hybrid shear wall system (EHSW) has been proposed. EHSW combines three technologies including post-tensioned unbonded prestressing, partially debond of grouted reinforcing bar, and overlapped closed stirrup to overcome the pivotal problems such as premature cracking and concrete damage concentration, which exist in present precast concrete shear walls in comparison with monolithic cast-in-place concrete shear wall. The model experiments, finite element analysis, and theoretical analysis are carried out to grasp the seismic performance of EHSW. The main work and conclusions are as follows:(1) Eight EHSW and one reference monolithic cast-in-place models of full scale are fabricated and tested under low-cyclic reversed lateral loading. The design parameters, such as area of unbonded prestressed tendons, initial prestressing stress in the tendons, debonded length of grouted reinforcing bar and axial loading ratio, are considered in the experiments. The failure pattern, strength, stiffness, ductility, energy dissipation and residual displacement are analyzed and the impact of design parameters on the seismic performance of EHSW models are obtained.(2) Finite element models reflecting the tested EHSW models are established and the analysis results are compared to the measured results to prove the accuracy of the finite element models. Parametric analysis based on established finite element model is conducted to supplement the experiment results.(3) Based on present calculation methodologies of flexural members, the force and displacement values at feature points, such as cracking point, yielding point, ultimate point and failure point, are determined. The calculated results are compared to the measured results and the calculation methods are modified by numerical fitting method according to the impact rule of design parameters.(4) With regard to the shape of measured hysteretic curves and skeleton curves, four-line model is proposed and restoring force mathematic model is established based on the modified strength and stiffness calculation methods. The four-line model and restoring force mathematic model have good accordance with the measured results.The seismic performance of EHSW is obtained and the relevant calculation method as well as hysteretic model are proposed based on the accomplished experiment and analysis work. The achievements establish data and theoretic basis for further research and engineering application of EHSW.更多还原