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Engineering characteristics of near-fault vertical ground motions and their effect on the seismic response of bridges

Li Xinle (ÀîÐÂÀÖ)¹, Dou Huijuan (ñ¼»Û¾ê)¹ and Zhu Xi (Öì •„)²

1. College of Architecture and Civil Engineering, Dalian Nationalities University, Dalian 116600, China
2. College of Architecture and Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
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Abstract: A wide variety of near-fault strong ground motion records were collected from various tectonic environments worldwide and were used to study the peak value ratio and response spectrum ratio of the vertical to horizontal component of ground motion, focusing on the effect of earthquake magnitude, site conditions, pulse duration, and statistical component. The results show that both the peak value ratio and response spectrum ratio are larger than the 2/3 value prescribed in existing seismic codes, and the relationship between the vertical and horizontal ground motions is comparatively intricate. In addition, the effect of the near-fault ground motions on bridge performance is analyzed, considering both the material nonlinear characteristics and the P~¦¤ effect.

Keywords: near-fault vertical ground motion; peak value ratio; spectrum ratio; bridge; seismic response