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对2009年4月6日阿布鲁佐地震造成的破坏观察表明,填充墙和钢筋混凝土结构之间局部的相互作用会产生柔层机制和脆性破坏。目前的实例研究成果是基于对佩蒂诺地区地震破坏观察的基础上进行的。建立了以模拟设计程序为基础的分析模型,并采用时程分析验证了由观察破坏所凸现出的结构倒塌的原因。通过考虑地面运动的所有分量,对这种破坏机制进行了研究。注意了砖砌块填充墙的非线性性能,考虑了填充墙力学性能的两个参数的假定,给出了表现这些非结构构件典型特征的不确定性。用三支撑杆宏观模型对填充墙进行非线性模拟,以考虑钢筋混凝土框架和填充墙之间局部和整体的相互作用。地震波输入是所研究结构附近在主震期间记录的真实信号。在评估中,选用了不同的抗剪承载力模型。分析结果似乎非常近似地证实了破坏观察所发现的主要类似倒塌情景;柱子缺乏合适的细部设计使得填充墙和钢筋混凝土柱之间的局部相互作用和地面运动的强烈垂直分量是造成脆性破坏的主要原因。
Observation of the damage caused by the April Abruzzo earthquake on April 6, 2009 showed that the local interaction between the infill walls and the reinforced concrete structure resulted in soft layering and brittle failure. The current case study is based on observations of the earthquake damage in the Petino region. The analytical model based on the simulation design program was established. The time-history analysis was used to verify the cause of structural collapse caused by observation damage. This destruction mechanism has been studied by considering all the components of ground motion. Attention is paid to the non-linear behavior of brick-infill walls. The assumption of two parameters of mechanical properties of filled-in walls is taken into account and the uncertainty of representing the typical features of these non-structural members is given. The three-strut macroscopic model is used to simulate the infill wall nonlinearly to account for the local and global interactions between the RC frame and the infill wall. Seismic wave input is the true signal recorded during the main shock near the structure under study. In the assessment, different shear capacity models were chosen. The results of the analysis seem to confirm, to a very near approximation, the major similar collapse scenarios found by sabotage observation; the lack of proper detailing of the columns makes the local interaction between the infill walls and the reinforced concrete columns and the strong vertical component of the ground motion the major cause of brittle failure the reason.