Evaluation of Earthquake Response of Reinforced Concrete Weak Model Structures

自1983年开始对钢筋混凝土建筑模型结构的地震反应进行了观测。构造了两种1/3比例的建筑结构：强梁-弱柱和弱梁-强柱。设计基础剪力降至日本实际剪力的50%左右，使结构即使在中震情况下也能承受破坏。分析了造成结构破坏的两次地震的反应记录。通过观察和分析，约束了钢筋的屈服和屈服机制的形成。用自由振动试验研究结构与地基土的相对刚度，用静力横向荷载试验估算结构与地基土的相对刚度。据报道，建筑物的反应可以通过a)静侧向强度和屈服机制，b)由于刚度退化引起的频率特性的变化，c)地面运动的频率特性和d)地基土的特性来估计。

Observation of earthquake response of reinforced concrete building model structures has geen carried out since 1983. Two types of 1/3 scaled buildings structures; strong beam-weak column and weak beam-strong column, were constructed. The design base shear was reduced to about 50% of the real practice in Japan so that the structures could take damage even in moderate earthquake. Records of response to two earthquakes, which caused damage to the structures, were analyzed in this project. Yielding of reinforcing bars and formation of yield mechanism were confined both by the observation and analysis. A free vibration test to investigate the deterioration of the stiffness and a static lateral loading test to estimate the relative stiffness between the structures and the ground soil were also caried out.It is reported here that building response can be estimated by the consideration of a) static lateral strength and yield mechanism, b) change of frequency characteristics due to stiffness deterioration, c) frequency characteristics of ground motion and d) characteristics of ground soil.