A General Seismic Design Method of Bridge Structures with the Object of Functional Assurance

本研究旨在发展桥梁结构的通用抗震设计方法，以保证桥梁结构的抗震性能。1)钢结构抗震设计和抗震分析的现状和研究课题。根据日本SOC关于抗震设计的第一和第二建议，概述了钢结构抗震设计的现状。土木工程师。2)输入地震动的估计和地震荷载的逼近采用一组具有相同加速度反应谱的模拟地震动来评估结构弹塑性地震反应的波动。3)钢桥墩对设置隔震器的钢桥墩的抗震性能进行了试验研究。提出了管型钢桥墩的滞回模型，并通过试验验证了该模型的正确性。在此基础上，应用基于Pushover分析的等效单自由度体系的地震弹塑性反应分析，建立了极限抗震设计方法的验算程序。

The present study is aimed at a developing general seismic design method of bridge structures with the object of assurance. For this purpose, various proposals for improvement on the functional preservation of bridge structures are shown, based on analytical and experimental results.1) Present state and research subjects of seismic design and seismic analysis of steel structuresPresent state of earthquake-resistant design of steel structures is outlined on the basis of first and second suggestions on the earthquake-resistant design of Japan Soc. of Civil Engineers. And important research subjects are summarized.2) Estimation of input earthquake motion and approach of the seismic loadThe fluctuation of the elasto-plastic seismic response of the structure is evaluated by applying a set of imitated earthquake ground motions with the equal acceleration response spectra. Discussion related to hysteresis models of the structure is also presented.3) Steel bridge piersInvestigations on the seismic performance of steel bridge piers with the seismic isolator are carried out. Also, the hysteretic model for pipe-section steel bridge piers is proposed, and its validity is examined by the experimental results. Furthermore, a procedure for the check of ultimate eathquake-resistance design method is developed by applying the seismic elasto-plastic response analysis of a equivalent SDOF system based on the pushover analysis.