装配式HPFRC耗能墙抗震性能试验研究

EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF ASSEMBLED HPFRC ENERGY-DISSIPATION WALL

  • 摘要: 高性能纤维增强混凝土材料(High performance fibre reinforced concrete, 简称HPFRC)能够表现出受拉应变-硬化和多裂缝开展性能,可以作为一种理想的耗能材料来制作可更换耗能构件。使用HPFRC材料设计制作5个1∶3比例的耗能墙,对其进行水平低周往复加载试验,研究分析了耗能墙的破坏特征、承载力、变形性能、刚度退化和耗能能力,并运用Park双参数模型对耗能墙进行了全过程损伤评估,最后将各项抗震性能指标按优劣分为A、B、C三类,结果显示耗能墙WP90F表现出的综合性能最佳。基于OpenSees平台,建立能够反映试件WP90F在循环荷载下滞回性能的数值模型并验证了适用性。结果表明:高宽比对耗能墙体初始刚度和水平承载力的影响最显著,竖向配筋率对水平承载力影响较为显著,但对初始刚度影响不显著。带竖缝HPFRC耗能墙具备成为可恢复功能结构体系中有效耗能元件的条件。

     

    Abstract: High-performance fibre reinforced concrete (HPFRC) can exhibit tensile strain-hardening and multi-crack development properties, and can be used as an ideal energy-consuming material to make replaceable energy-dissipation components. Five 1∶3 scale energy-dissipation walls were designed and constructed using HPFRC materials, and subjected to horizontal low-cycle reciprocating loading tests. The study analyzed the failure characteristics, load-bearing capacity, deformation performance, stiffness degradation, and energy dissipation capability of the walls. The Park two-parameter model was applied to assess the damage throughout the process, and finally, the seismic performance indicators were categorized into three classes (A, B, C) based on the quality. The results showed that the WP90F energy-dissipation wall exhibited the best overall performance. Based on the OpenSees platform, a numerical model was established to reflect the hysteretic behavior of specimen WP90F under cyclic loading, and its applicability was verified. The results indicate that the aspect ratio has the most significant impact on the initial stiffness and horizontal load-bearing capacity of the energy-dissipation walls. The longitudinal reinforcement ratio significantly affects the horizontal load-bearing capacity, but its influence on the initial stiffness is not as pronounced. The HPFRC energy-dissipation wall with vertical seams has the potential to be effective energy-dissipation elements in the earthquake resilient systems.

     

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