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国际标准刊号:ISSN 2096-6717
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基于位移的钢筋混凝土框架结构整体等效阻尼比模型
闫路路1,2, 冯治斌1,2, 贡金鑫1,2
1.大连理工大学 土木工程学院;2.海岸和近海工程国家重点实验室, 辽宁 大连 116024
摘要:
现有针对钢筋混凝土框架结构的等效阻尼比公式大多使用简化的单自由度滞回模型等效推导得出,难以充分反映结构的整体非线性滞回特征。按现行抗震规范设计了66个不同层数和跨度的规则钢筋混凝土框架结构,并对其进行单向推覆分析,选出其中主要通过梁铰变形耗能的51个结构进行往复推覆分析,基于等能量耗散原则建立了适用的整体等效阻尼比模型,分析表明,基于该等效阻尼比的结构位移需求预测值总体偏低。为此,进一步通过动力时程分析对其进行修正,采用修正后的整体等效阻尼比模型进行拟静力非线性分析,所得结果与时程分析得到的平均最大位移基本一致,说明该模型具有较好的适用性,可以更好地反映结构整体耗能特性。
关键词:  钢筋混凝土  框架结构  抗震设计  推覆分析  整体等效阻尼比
DOI:10.11835/j.issn.2096-6717.2019.098
分类号:TU375.4
基金项目:国家自然科学基金(51478077、51678104)
Development of equivalent damping ratio model of reinforced concrete framed structures for displacement based seismic design
Yan Lulu1,2, Feng Zhibin1,2, Gong Jinxin1,2
1.School of Civil Engineering;2.State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, Liaoning, P. R. China
Abstract:
Most equivalent damping ratio (EDR) models available to date for RC framed system are generally difficult to describe the structural hysteretic characteristic effectively since they are derived on the bases of equivalent single degree of freedom system. In this paper, 66 RC framed structures with various parameters and configurations are established based on the current seismic design code and monotonic pushover analyses are implemented. Then, 51 structures that have ductility deformation mechanism are selected to perform cyclic pushover analyses for establishing a global EDR model based on the principle of equating energy dissipation. Considering that this EDR model may underestimate the displacements demand, nonlinear dynamic analyses (NDA) are implemented and this EDR model is modified. It is found that the results obtained by nonlinear static analysis using the proposed modified EDR are consistent with those obtained by NDA. The proposed EDR model is of wide applicability and can reflect the global energy dissipation characteristics of RC framed structures.
Key words:  reinforced concrete  framed structure  seismic design  pushover analysis  equivalent damping ratio
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