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Seismic Performance of Structures with Multi-Plastic Hinge subjected to an extreme earthquake ground motion

极端地震作用下多塑铰结构的抗震性能

基本信息

批准号：
09450175
负责人：
KAWASHIMA Kazuhiko
金额：
$ 3.01万
依托单位：
TOKYO INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450175/
关键词：
ductility design seismic response seismic design plastic hinge hysteresis seismic isolation nonlinear analysis energy dissipation エネルギー呼吸

项目摘要

In the current seismic design procedure for structures with multi-plastic hinge, only a dominant plastic hinge is considered and secondary plastic hinges were disregarded because the interaction of nonlinear behavior between the dominant plastic hinge and secondary plastic hinges has not yet be clarified from the point of system nonlinear response.The yield strength ratio between dominant plastic hinge and secondary plastic hinge is one of sensitive parameters in the nonlinear interaction between the dominant plastic hinge and secondary plastic hinges. Therefore for two plastic hinge structures such as an isolator-column of bridge system and a bridge-column-pile foundation system, the dependence of the yield strength ratio on the hysteretic energy dissipation is clarified from a series of nonlinear dynamic response analysis.In order to clarify the mechanism to form the secondary plastic hinges after a dominant plastic hinge was formed, the push over analysis for a bridge-column-pile foundation system as well as a framed bridge was conducted. The loading path effect on deformation of structural elements and the multi-plastic process .was evaluated.This research project also conducted an analysis to predict exact nonlinear responses for structures with multi-plastic hinge. A multi-span continuous bridge supported by flexible elastomeric bearings was analyzed for such purpose that deformation of elastomeric bearings contributes to deck displacement, it was identified that the system ductility factor instead of the column ductility factor should be used to evaluate the force reduction factor.From the analysis, it became clear that the effect of multi-plastic hinge for system nonlinear response must be considered in the next generation codes of seismic design.

在现行的多塑性铰结构抗震设计方法中，由于从非线性响应的角度尚未阐明主导塑性铰与次塑性铰之间的相互作用，因此只考虑主导塑性铰，而忽略次塑性铰，主导塑性铰与次塑性铰之间的屈服强度比是结构非线性响应的敏感参数之一。主导塑性铰和次塑性铰之间的非线性相互作用。因此，针对桥梁隔震柱体系和桥梁柱桩基础体系这两种塑性铰结构，通过一系列非线性动力响应分析，阐明了屈服强度比对滞回耗能的依赖关系，为阐明主导塑性铰形成后次塑性铰形成的机理，对桥梁-柱-桩基础体系和框架桥进行了推覆分析。分析了加载路径对结构构件变形的影响及多重塑性过程，并对多重塑性铰结构的非线性响应进行了精确预测。针对弹性支座的变形对桥面板位移的影响，对一座多跨连续梁桥进行了分析，认为弹性支座的内力折减系数应采用体系延性系数而不是柱延性系数。表明在下一代抗震设计规范中必须考虑多塑性铰对体系非线性反应的影响。