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Seismic performance assessment of reinforced concrete buildings with precast concrete floor systems.

机译：带有预制混凝土楼板系统的钢筋混凝土建筑物的抗震性能评估。

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In the seismic design of reinforced concrete frames, plastic hinges are allocated to beams such that a ductile beam-sway mechanism will form in preference to other less ductile mechanisms in the event of a major earthquake. This is achieved by ensuring that the flexural strength of columns is greater than that corresponding to the maximum likely flexural strength of beam plastic hinges. Recent experimental studies in New Zealand have shown that elongation of ductile beam plastic hinges, and its interaction with nearby floor slab containing precast-prestressed floor units, increases the strength of beams much more than that specified in New Zealand and American Concrete standards. This level of strength enhancement has raised concern on the adequacy of the current design provisions. To further investigate this problem, a research project was initiated to examine the strength of beam plastic hinges in reinforced concrete frames containing precast-prestressed floor units. In this research, the strength of beam plastic hinges was assessed through experimental and analytical studies. A three-dimensional, one-storey, two-bay reinforced concrete moment resisting frame with prestressed floor units and cast-in-situ concrete topping was tested under quasi-static displacement-controlled cyclic loading. The experimental results provided insight into the mechanics associated with frame-floor interaction. Subsequently, improved design specifications were proposed based on the observed behaviour.To analytically predict the beam-floor interaction, a ductile reinforced concrete plastic hinge multi-spring element was developed and validated with experimental results from cantilever beam and frame sub-assembly tests reported in the literature. The comparisons have demonstrated the ability of the proposed plastic hinge element to predict the flexural, shear, axial, and most importantly, elongation response of ductile plastic hinges. The proposed plastic hinge element was implemented into an analytical model to simulate the behaviour of the frame-floor sub-assembly tested in this research. Specially arranged truss-like elements were used to model the linking slab (the region connecting the main beam to the first prestressed floor unit), where significant inelastic behaviour was expected to occur. The analytical model was found to be capable of predicting the non-linear hysteretic response and the main deformation mechanisms in the frame-floor sub-assembly test. The analytical frame-floor model developed in this study was used to examine the effect of different structural arrangements on the cyclic behaviour of frames containing prestressed floor units. These analyses indicated that slab reinforcement content, the number of bays in a frame and the position of frame in a building (i.e., perimeter or internal frame) can have a significant influence on the strength and elongation response of plastic hinges.
机译：在钢筋混凝土框架的抗震设计中，将塑料铰链分配给梁，这样在发生大地震时，将优先形成延性的梁摇摆机制，而不是其他延展性较小的机制。这是通过确保柱的抗弯强度大于对应于梁式塑料铰链的最大可能抗弯强度来实现的。新西兰最近的实验研究表明，延性梁塑料铰链的伸长及其与附近装有预制预应力地板单元的楼板的相互作用，使梁的强度大大超过了新西兰和美国混凝土标准中规定的强度。这种强度增强水平引起了人们对当前设计规定是否足够的关注。为了进一步研究这个问题，发起了一个研究项目，以检查包含预制预应力地板单元的钢筋混凝土框架中的梁式塑料铰链的强度。在这项研究中，通过实验和分析研究评估了梁式塑料铰链的强度。在准静态位移控制的循环荷载下，测试了带有预应力地板单元和现浇混凝土浇顶的三维，一层，两层钢筋混凝土抗弯框架。实验结果提供了与框架-地板相互作用相关的力学的见解。随后，根据观察到的性能提出了改进的设计规范。为分析性地预测梁与楼板之间的相互作用，开发了一种延性钢筋混凝土塑料铰链多弹簧元件，并根据悬臂梁和框架子组件测试报告的实验结果进行了验证。文献。比较已经证明了所提出的塑料铰链元件预测延展性塑料铰链的挠曲，剪切，轴向以及最重要的伸长响应的能力。拟议中的塑料铰链元件被实现为分析模型，以模拟在本研究中测试的框架地板子组件的行为。使用特殊布置的桁架状单元来建模连接板（将主梁连接到第一预应力楼板单元的区域），在该处预计会发生显着的非弹性行为。分析模型被发现能够预测非线性滞后响应以及框架地板组件测试中的主要变形机制。在这项研究中开发的分析框架地板模型用于检查不同结构布置对包含预应力地板单元的框架的循环行为的影响。这些分析表明，平板的钢筋含量，框架中的间隔数量以及框架在建筑物中的位置（即周边或内部框架）可能对塑料铰链的强度和伸长响应产生重大影响。

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    Peng Brian Hsuan-Hsien;

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  • 年度 2009
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