Building structural system to maintain structural functions during earthquakes and rapid recovery afterward

通过试验和数值分析，构建了高性能钢筋混凝土建筑结构体系，以保持结构的功能。最后，作为美日合作项目的一部分，在E-defense振动台上对一座实际规模的四层后张预应力混凝土建筑进行了测试。该结构对不同烈度的模拟地震均表现出优良的抗震性能。在振动过程中层间漂移最小，残余位移和裂缝几乎为零，从而实现了损伤控制系统。不幸的是，在2级地震中，由于柱和墙的基础有混凝土剥落，刚度急剧下降。然而，经证实，在柱和墙的基础上提供纤维增强混凝土可以防止刚度退化。

A high performance RC building structural system has been constructed in order to maintain structural functions based on experiments and numerical analyses. To conclude the works in the project, a real scale four story post-tensioned precast concrete building was tested on the E-defense shaking table as a part of the collaborative US-Japan project. The structure shows excellent performance for various intensity of simulated earthquakes. Interstory drifts were minimal during the shaking and residual displacements and cracks were almost zero to achieve a damage control system. Unfortunately, the stiffness decreased dramatically for a Level 2 earthquake since bases of columns and walls had spalling of cover concrete. However, it was confirmed that the stiffness degradation could have been prevented by supplying fiber reinforced concrete at bases of columns and walls.