Critical Response of 2DOF Elastic–Plastic Building Structures under Double Impulse as Substitute of Near-Fault Ground Motion

Frontiers in Built Environment

Taniguchi, Ryo¹  Takewaki, Izuru¹  Kojima, Kotaro¹ 

[1] Department of Architecture and Architectural Engineering, Graduate School of Engineering, Kyoto University, Japan

关键词: Earthquake Response;    Near-fault ground motion;    double impulse;    critical input;    Critical response;    Elastic-plastic response;    2DOF model;    resonance;    Upper bound;    convex model;   

DOI  :  10.3389/fbuil.2016.00002

学科分类：建筑学

来源: Frontiers

【 摘 要 】

The double impulse is introduced as a substitute of the fling-step near-fault ground motion and a critical elastic-plastic response of a 2DOF (two-degree-of-freedom) building structure under the ‘critical double impulse’ is evaluated. Since only the free-vibration appears under such double impulse, the energy balance approach plays an important and essential role in the derivation of the solution of a complicated elastic-plastic critical response. It is shown that the critical timing of the double impulse is characterized by the timing of the second impulse at the zero story shear force in the first story. This timing guarantees the maximum energy input by the second impulse which causes the maximum plastic deformation after the second impulse. Because the response of 2DOF elastic-plastic building structures is quite complicated due to the phase difference between two masses compared to SDOF models for which a closed-form critical response can be derived, the upper bound of the critical response is introduced by using the convex model.

【 授权许可】

CC BY