Study on the development of the energy dissipating device using PVA-HPFRCC

1.吸能装置的地震试验1.试验目的是研究PVA-HPFRCC加固墙体柱作为消能装置的结构性能。PVA-HPFRCC为聚乙烯醇(PVA)纤维增强混凝土，本研究所用PVA-HPFRSS的纤维体积分数为1.5%。试验的主要目的是研究在每个剪应力水平下的损伤容限、能量耗散和刚度控制。2试验概述6个装置元件进行了静力循环加载试验。装置净跨截面宽200 mm，深450 mm，跨距分别设置为900 mm、600 mm、450 mm。结合主筋的屈服强度和剪跨，设计了主筋的刚度和剪应力水平。3试验结果：(1)用PVA-HPFRCC代替混凝土后，延性和耗能性能均有所提高。此外，PVA-HPFRCC试件裂缝分布均匀，裂缝宽度小于常规钢筋混凝土试件。(2)结合主筋屈服强度和剪跨对试件的刚度和抗弯承载力进行控制。通过本次试验，PVA-HPFRCC加固墙体型柱可以作为耗能装置使用。地震反应分析通过静载试验建立了PVA-HPFRCC耗能装置的力-位移滞回模型，并对设置PVA-HPFRCC耗能装置的钢筋混凝土结构进行了地震反应分析。通过设置PVA-HPFRCC装置，减小了钢筋混凝土结构的地震反应。结果表明，PVA-HPFRCC耗能减震装置对钢筋混凝土结构的地震反应具有较好的控制效果。

1. Seismic test of the device for energy absorption1. 1 Object of the testA test was conducted to investigate the structural performance of the PVA-HPFRCC reinforced wall type columns, which was planned as energy dissipating device. PVA-HPFRCC is Polyvinyl Alcohol (PVA) fiber reinforced mortal, the fiber volume fraction of PVA-HPFRSS used in this research is 1.5%. Main objective of the test is to investigate the damage tolerance in each shear stress level, the energy dissipation, and the stiffness control.1. 2 Outline of the testThe statical cyclic loading test with six device elements was conducted. The cross section in clear span of the device was 200mm in width, 450 mm in depth, and its span were set at 900, 600, 450mm. The stiffness and the shear stress level were designed by combining the yield strength of main bar and the shear span.1. 3 Result of the test(1) The ductility and the energy dissipation were upgraded by using PVA-HPFRCC in place of concrete. Further, in PVA-HPFRCC specimen, the crack was distributed and the width of crack is smaller than conventional RC specimen.(2) The stiffness and flexural capacity were controlled by combining the yield strength of main bar and the shear span. It mean that the device using PVA-HPFRCC absorb the energy from little deflection angle.Though this test, the PVA-HPFRCC reinforced wall type columns can use as energy dissipating device.2. Seismic response analysisForce-displacement hysteresys of the energy dissipating device using PVA-HPFRCC was modeled by statical loading test, and the seismic response analysis about RC structure with the device was conducted. The seismic response of RC structure was decreased by inserting the device using PVA-HPFRCC. As the result, it can be said that the energy dissipating device using PVA-HPFRCC useful to control the seismic response of the RC structure.