Hybrid post-tensioned precast concrete walls for use in seismic regions
Hybrid post-tensioned precast concrete walls for use in seismic regions
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DOI：
10.15554/pcij.09012002.36.59
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发表时间：
2002-09-01
期刊：
影响因子：
1.1
通讯作者：
Kurama, YC
中科院分区：
文献类型：
--
作者：
Kurama, YC
最近的研究表明，后张预制混凝土抗侧向荷载墙不模仿整体现浇钢筋混凝土墙的行为，具有理想的抗震特性，例如自定心能力和承受非线性侧向位移而几乎没有损坏的能力。这些墙在地震荷载下的最大缺点是由于能量耗散小而导致横向位移增加。本文研究了一种“混合”预制墙系统，除了后张预应力钢之外，该系统还使用低碳钢加固来提高抗弯强度和非弹性能量耗散。进行了分析参数研究，以比较一系列具有不同数量的低碳钢和后张钢的原型墙的预期抗震性能。墙体的非线性动态时程分析表明，使用低碳钢加固可以大大减少地震荷载下墙体的横向位移，特别是对于高地震和振动周期较短的地区的墙体。这些分析的结果用于提出在地震区使用混合后张预制墙的初步设计意义。
Recent research has shown that post-tensioned precast concrete lateral load resisting walls that do not emulate the behavior of monolithic cast-in-place reinforced concrete walls have desirable seismic characteristics such as a self-centering capability and an ability to undergo nonlinear lateral displacements with little damage. The biggest disadvantage of these walls under earthquake loading is an increase in the lateral displacements as a result of small energy dissipation. This paper investigates a "hybrid" precast wall system that uses mild steel reinforcement in addition to the post-tensioning steel for flexural strength and inelastic energy dissipation. An analytical parametric study is conducted to compare the expected seismic behavior of a series of prototype walls with different amounts of mild steel and post-tensioning steel. Nonlinear dynamic time history analyses of the walls indicate that the use of mild steel reinforcement results in a considerable reduction in the lateral displacements of the walls under earthquake loading, particularly for walls in regions of high seismicity and with shorter periods of vibration. The results of these analyses are used to present preliminary design implications for the use of hybrid post-tensioned precast walls in seismic regions.