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

本研究旨在发展一种以保证为目标的桥梁结构抗震设计通用方法。为此，根据分析和实验结果，提出了改进桥梁结构功能保护的各种建议。1)钢结构抗震设计与抗震分析的现状与研究课题。在日本Soc抗震设计第一、二项建议的基础上，概述了钢结构抗震设计的现状。土木工程师。并对重要的研究课题进行了总结。2)输入地震运动的估计和地震荷载的求解采用一组具有等加速度响应谱的模拟地震动来评估结构弹塑性地震反应的波动。并对结构的滞回模型进行了讨论。3)钢桥墩。对带隔震器的钢桥墩抗震性能进行了研究。建立了钢管截面钢桥墩滞回模型，并通过试验验证了模型的有效性。在此基础上，应用基于推覆分析的等效单自由度体系的地震弹塑性响应分析，建立了极限抗震设计方法的校核程序。

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.