自复位结构延性需求谱研究

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振动与冲击 ›› 2018, Vol. 37 ›› Issue (18) : 73-77.

论文

自复位结构延性需求谱研究

杨博雅，吕西林

作者信息 +

Ductility demand spectra for self-centering systems

YANG Boya,L Xilin

Author information +

文章历史 +

摘要

自复位结构的滞回曲线为旗帜型，具有延性好、损伤小等特点。对旗帜型滞回模型建立单自由度体系，进行弹塑性时程分析，获得了等强度延性需求谱。与代表现浇结构的双线性弹塑性滞回模型进行对比，表明延性需求更大，设计时要通过合理的措施保证更高的延性。研究了整体设计参数，如强度折减系数、抬起后刚度和滞回耗能能力对自复位结构的延性需求影响，说明了旗帜型滞回模型的非线性反应谱特征。对模型进行参数分析，说明了抬起后刚度系数α和耗能系数β对旗帜型滞回模型的影响。结果表明，在一定程度上增加α或增加β，可以减小自复位结构的延性需求。

Abstract

Self-centering structures can undergo large deformation with minor residual displacement under the strong earthquake excitations, exhibiting flag-shaped hysteretic behaviors.The dynamic elastic-plastic analysis of the systems of bilinear elastic (EP) model and self-centering (SC) model was conducted to acquire the ductility demand factor μ for different seismic modification factor R.It is shown that self-centering systems develop greater ductility demands than cast-in-place RC systems when the lateral strength and post-yielding stiffness keep the same.When the post-uplifting stiffness and hysteretic energy dissipation capacity of the self-centering systems are increased, the ductility demands decrease obviously.

导出引用

杨博雅，吕西林. 自复位结构延性需求谱研究[J]. 振动与冲击, 2018, 37(18): 73-77

YANG Boya,L Xilin . Ductility demand spectra for self-centering systems[J]. Journal of Vibration and Shock, 2018, 37(18): 73-77

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