Ranking the damage potential of input ground motions for typical railway beam bridge
HU Jinjun1, FAN Yuan2， LAI Qinghui1， XIE Lili1
1.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China;
2.Institute of Structural Engineering and Disaster Prevention, Tongji University, Shanghai 200092, China
Abstract：Research purposes：Selection of input ground motion is critical in seismic analysis of bridges. The concept of “the most unfavorable design ground motion” has been widely used in building structures. This paper extends this concept to the field of bridges to study the sequence of structural responses of bridges under ground motion excitation. In this paper, different ways of measuring input ground motion and the damage index are introduced. The OpenSees finite element analysis is used to input a large number of ground motion records into the pier model. The relationship between amplitude and single parameter is studied by means of strip method. The relationship between amplitude and multi-parameter is studied by introducing color mapping theory.
Research conclusions：(1) When the lower amplitude ground motion occurs, the results are obtained. The correlation between the seismic response and the response spectrum of the first period is the best when applied to the structure; (2) with the increase of the amplitude, the period of the structure increases, the correlation between the seismic response and the response spectrum of the longer period, as well as the velocity, displacement and duration parameters will gradually increase; (3) the displacement of the pier top was compared through the dynamic time history calculation. Comparing with this model, the records of the model under the peak ground motion are given. For structure similar to the model in this paper, the records can be used as the input design ground motion.
胡进军1,樊圆2,来庆辉1，谢礼立1. 典型铁路梁桥抗震设计地震动破坏势排序[J]. 振动与冲击, 2020, 39(11): 14-21.
HU Jinjun1, FAN Yuan2， LAI Qinghui1， XIE Lili1. Ranking the damage potential of input ground motions for typical railway beam bridge. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(11): 14-21.
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