Study on selection of earthquake input and adjustment method in girder bridge seismic response analysis
Time-history analysis method has become the most popular seismic analysis method of bridge structure, however, selection of the input seismic motion is a key factor affecting the reliability of time-history analysis results. Combining the basic principle of structure dynamic amplification coefficient and the energy principle of seismic wave, response spectrum model fitting is summarized as to the rules and regulations of structural natural vibration period ranging from 0.1 s to Tg, which is surrounded by interval response spectrum curve as the basis of the natural seismic wave of comparative parameters. This paper puts forward five adjusting methods of natural seismic records based on the above mentioned two intervals. In addition, numerical analysis of a typical multi-span bridge is carried out to investigate response statistics of bridge pier bottom moment, base shear and pier top displacement. Numerical analysis results prove that the double parameters selection method of seismic record and adjusting criterion are reasonable and effective.
1.State Key Laboratory for Seismic Control and Structural Safety (Cultivation base), Guangzhou University, Guangzhou 510405, China;
2. Guangxi Transportation Research Institute, Nanning 530007, China；
3. Guangxi Key Laboratory of Disaster Prevention and Structural Safety, Nanning 530007, China
Abstract：Time-history analysis method has become the most popular seismic analysis method of bridge structure, however, selection of the input seismic motion is a key factor affecting the reliability of time-history analysis results. Combining the basic principle of structure dynamic amplification coefficient and the energy principle of seismic wave, response spectrum model fitting is summarized as to the rules and regulations of structural natural vibration period ranging from 0.1 s to Tg, which is surrounded by interval response spectrum curve as the basis of the natural seismic wave of comparative parameters. This paper puts forward five adjusting methods of natural seismic records based on the above mentioned two intervals. In addition, numerical analysis of a typical multi-span bridge is carried out to investigate response statistics of bridge pier bottom moment, base shear and pier top displacement. Numerical analysis results prove that the double parameters selection method of seismic record and adjusting criterion are reasonable and effective.
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