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Optimal vector-valued intensity measure for seismic collapse assessment of structures

Earthquake Engineering and Engineering Vibration 2015年第1期14卷 37-54页

作者： Masood Yakhchalian Ahmad Nicknam Gholamreza Ghodrati Amiri School of Civil Engineering Iran University of Science & Technology Center of Excellence for Fundamental Studies in Structural Engineering School of Civil Engineering Iran University of Science & Technology

The present study is aimed to investigate the ability of different intensity measures （IMs）, including response spectral acceleration at the fundamental period of the structure, Sa（T1）, as a common scalar IM and twelve vector-valued IMs for seismic collapse assessment of structures. The vector-valued IMs consist of two components, with S（T1） as the first component and different parameters that are ratios of scalar IMs, as well as the spectral shape proxies εSa and N, as the second component. After investigating the properties of an optimal IM, a new vector-valued IM that includes the ratio of Sa（T1） to the displacement spectrum intensity （DSI） as the second component is proposed. The new IM is more efficient than other IMs for predicting the collapse capacity of structures. It is also sufficient with respect to magnitude, source-to-site distance, and scale factor for collapse capacity prediction of structures. To satisfy the predictability criterion, a ground motion prediction equation （GMPE） is determined for Sa（T1）/DSI by using the existing GMPEs. Furthermore, an empirical equation is proposed for obtaining the correlation between the components of the proposed IM. The results of this study show that using the new vector-valued IM leads to a more reliable seismic collapse assessment of structures.

关键词： intensity measure efficiency sufficiency displacement spectrum intensity collapse capacity fragility surface

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Endurance time history analysis of the seismic behavior and performance assessment of hydro-chemo-mechanical degradation-affected hydraulic tunnels with service time

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Underground Space 2024年第4期17卷 207-225页

作者： Benbo Sun Pengxiao Wang Gangqin Zhang Mingjiang Deng Weiying Liu Jia Xu School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China Xinjiang Ertix River Basin Development and Construction Management Bureau Urumqi 830000China

Subjected to the coupling action of multiple hazards in hydraulic engineering,hydraulic tunnels may be corroded and damaged to varying degrees during their service lives,which will decrease the seismic performance of these ***,the research and seismic design of significant hydraulic engineering projects focus on investigating the structural response based on the design material parameters,which may overestimate the seismic capacity of structures during their service *** this paper,research is performed to identify the effect of hydro-chemo-mechanical corrosion on the seismic performance of hydraulic tunnels with different burial depths.A plastic damage model of time-varying concrete degradation induced by the hydro-chemo-mechanical effect is first determined and implemented,and the endurance time acceleration records are generated in ***,a study of the endurance time relationship of hydro-chemomechanical corrosion-affected hydraulic tunnels,considering the fluid–structure-surrounding rock interaction systems throughout the service period,is undertaken to directly associate the structural response with the predefined evaluation ***,this research constructs 3D time-varying fragility surfaces considering the hydro-chemo-mechanical effect and seismic *** results show that the relative displacement of hydro-chemo-mechanical corrosion-affected hydraulic tunnels is larger than that of nonaffected hydraulic ***-chemo-mechanical effect-induced material deterioration will lead to an increase in the cumulative damage(crack)area and damage degree of hydraulic ***,the seismic fragility analysis shows that the longer the service time of hydro-chemo-mechanical corrosion-affected hydraulic tunnels,the more likely they are to ***,attention should be given to improving the aseismic capacity of hydro-chemo-mechanical corrosion-affected hydraulic tunnels in future seismic design and performance asses

关键词： Hydro-chemo-mechanical effect Time-varying Hydraulic tunnels fragility surface

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The analysis of the optimal scalar and vector intensity measurements for seismic performance assessment of deep-buried hydraulic arched tunnels

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Underground Space 2023年第2期9卷 218-233页

作者： Benbo Sun Gangqin Zhang Binghan Xue Lei Kou Liangming Hu Weiying Liu Yellow River Laboratory Zhengzhou UniversityZhengzhou 450001China School of Water Conservancy and Civil Engineering Zhengzhou UniversityZhengzhou 450001China

The selection of optimal intensity measures(IMs)has been recommended for generating the seismic demand models with different probabilities by researchers since the seismic IMs are closely associated with earthquake risks and structural ***,the seismic design code(mainly for aboveground structures)and dynamic analysis of underground structures conventionally employ the peak ground acceleration(PGA)as an optimal *** this paper,the research is to identify the optimal scalar and vector IMs in the fragility investigation of deep-buried hydraulic arched tunnels using the finite element method.A refinement process was performed to determine the optimal scalar IMs by comprehensively comparing their correlation,efficiency,practicality,proficiency,and sufficiency among the examined ***,the optimum vector IMs were also developed,followed by the three different scalar ***,the dif-ferences between the fragility curves of the tunnel produced using the optimal scalar and vector IM were *** generated vector fragility surface can be used to estimate the seismic fragility of identical hydraulic tunnels in an approximative manner.

关键词： Intensity measure Hydraulic tunnels Examine fragility curve fragility surface

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