Verification of seismic performance of building using popular seismometers

对一层具有较大刚度和强度偏心的三尺度钢筋混凝土框架结构进行了动力试验。在筑波国立建筑研究所的大型振动台上，同时制作了两个截面尺寸和配筋细节相同的试件。一个是裸露的钢筋混凝土结构，而另一个是用聚酯纤维板加固的。未进行加固的柱在剪切作用下发生破坏，轴向承载能力丧失，根据试验结果对柱的破坏过程进行了追溯。另一方面，加固后的框架不仅对相同的输入运动反应稳定，损伤较小，而且在后续更高水平的输入运动中也能存活下来。建立了具有滞回劣化的非线性动力框架柱倒塌分析模型。安装了不同类型的地震仪来测量加速度计引起的层间漂移反应。提出了一种加速度积分滤波方法，并通过振动台试验进行了验证。在学校建筑中设置了密集的地震仪现场观测系统，以识别地震反应，包括土-结构相互作用对土壤非弹性行为的影响。采用带和不带SSI的详细框架模型分析了在中等地震下观测到的响应。在使用SSI进行分析的情况下，观察到更好的相关性。

Dynamic tests were conducted on a third scale reinforced concrete wall-frame structures with considerable stiffness and strength eccentricity in the first story. Two specimens with the same sectional dimensions and reinforcement details were constructed and tested simultaneously on the large shaking table at NIED, Tsukuba. One was a bare reinforced concrete structure, while the other was strengthened with polyester fiber sheet. The columns without strengthening failed in shear resulting in collapse associated with loss of the axial load carrying capacity, whose collapse process was traced on the basis of test results. On the other hand, the strengthened frame not only responded stably to the same input motion with minor damage but also survived still higher levels of succeeding input motions. The analytical model is presented to simulate the collapse of the columns for nonlinear dynamic frame analysis with hysteretic deterioration. Different types of seismometers were installed to measure story drift responses from accelerograms. A method of filtering for integration of acceleration was developed, which was verified from the shaking table test. Dense field observation system of seismographs has been set up in school buildings to identify the earthquake responses including the effect of soil-structure interaction with inelastic behaviour of soil. The observed response under a moderate earthquake was analysed by the detailed frame model with and without SSI. A better correlation is observed in case of the analysis with SSI.