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Performance-based methodology for assessing seismic vulnerability and capacity of buildings

Earthquake Engineering and Engineering Vibration 2010年第2期9卷 157-165页

作者： Lin Shibin1, Xie Lili1, 2,Gong Maosheng1,2 and Li Ming1,3 1.Institute of Engineering Mechanics,China Earthquake Administration, Harbin 150080, China 2.School of Civil Engineering,Harbin Institute of Technology,Harbin 150090, China 3.School of Civil Engineering,Shenyang Jianzhu University,Shenyang 11016, China Institute of Engineering Mechanics China Earthquake Administration Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China School of Civil Engineering Shenyang Jianzhu University Shenyang China

This paper presents a performance-based methodology for the assessment of seismic vulnerability and capacity of buildings. The vulnerability assessment methodology is based on the HAZUS methodology and the improved capacity- demand-diagram method. The spectral displacement (Sd) of performance points on a capacity curve is used to estimate the damage level of a building. The relationship between Sd and peak ground acceleration (PGA) is established, and then a new vulnerability function is expressed in terms of PGA. Furthermore, the expected value of the seismic capacity index (SCev) is provided to estimate the seismic capacity of buildings based on the probability distribution of damage levels and the corresponding seismic capacity index. The results indicate that the proposed vulnerability methodology is able to assess seismic damage of a large number of building stock directly and quickly following an earthquake. The SCev provides an effective index to measure the seismic capacity of buildings and illustrate the relationship between the seismic capacity of buildings and seismic action. The estimated result is compared with damage surveys of the cities of Dujiangyan and Jiangyou in the M8.0 Wenchuan earthquake, revealing that the methodology is acceptable for seismic risk assessment and decision making. The primary reasons for discrepancies between the estimated results and the damage surveys are discussed.

关键词： performance-based vulnerability building damage seismic capacity software HAZUS

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Investigation of Effects of capacity Spectrum Method on Performance Evaluation of Multi-Story Buildings According to the IRAQI seismic Code Requirements

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Open Journal of Civil Engineering 2016年第3期6卷 420-441页

作者： Al-Nuaimi Amer Mohamed Sobaih Akl Adel Department of Civil Engineering University of Baghdad Baghdad Egypt Department of Structural Engineering Cairo University Cairo Egypt

The aim of this study is to assess the performance objectives defined in the Iraqi seismic Code (ISC) in order to make a realistic evaluation related to Performance-Based seismic Design (PBSD) of multi-story reinforced concrete buildings and also to compare and evaluate structural response demands obtained from nonlinear static analysis procedures according to two versions of the capacity spectrum method (CSM) which are recommended in ATC 40 and ATC 55. Two groups of three-dimensional RC buildings with different heights, designed according to Iraqi Building Code Requirements for Reinforced Concrete (IBC), are investigated. Pushover analyses are carried out to determine the nonlinear behavior of the buildings under three different seismic hazard levels, for two Iraqi seismic zones, of earthquake loads. In order to determine performance levels of the buildings, maximum inter-story drift demands and plasticizing sequence are determined and compared with the related limits using the CSM recommended in ATC 40 and ATC 55. From the results of this research, it can be concluded that RC buildings designed according to the Iraqi codes sufficiently provide the performance objectives stipulated in the ISC. Comparing structural response quantities obtained from the two versions of CSM, effects on performance evaluations of the buildings are investigated comparatively, as well.

关键词： Pushover Analysis capacity Spectrum Method seismic capacity Iraq PBSD RC Buildings

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Study on vulnerability matrices of masonry buildings of mainland of China

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 251-259页

作者： Sun Baitao Zhang Guixin Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration Harbin 150080China

The degree and distribution of damage to buildings subjected to earthquakes is a concern of the Chinese Government and the *** damage data indicates that seismic capacities of different types of building structures in various regions throughout mainland of China are ***,the seismic capacities of the same type of structure in different regions may *** contributions of this research are summarized as follows：1）Vulnerability matrices and earthquake damage matrices of masonry structures in mainland of China were chosen as research *** aim was to analyze the differences in seismic capacities of sample matrices and to present general rules for categorizing seismic resistance.2）Curves relating the percentage of damaged masonry structures with different seismic resistances subjected to seismic demand in different regions of seismic intensity（VI to X）have been developed.3）A method has been proposed to build vulnerability matrices of masonry *** damage ratio for masonry structures under high-intensity events such as the Ms 6.1 Panzhihua earthquake in Sichuan province on 30 August2008,was calculated to verify the applicability of this *** research offers a significant theoretical basis for predicting seismic damage and direct loss assessment of groups of buildings,as well as for earthquake disaster insurance.

关键词： seismic capacity seismic intensity seismic resistances seismic damage matrix

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Effects of riverbed scour on seismic performance of high-rise pile cap foundation

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 533-543页

作者： Han Zhenfeng Ye Aijun Fan Lichu State Key Laboratory for Disaster Reduction of Civil Engineering Tongji University Shanghai 200092 China

To explore the seismic performance of a high-rise pile cap foundation with riverbed scour, a finite element model for foundations is introduced in the OpenSees finite element framework. In the model, a fiber element is used to simulate the pile shaft, a nonlinear p-y element is used to simulate the soil-pile interaction, and the p-factor method is used to reflect the group effects. A global and local scour model is proposed, in which two parameters, the scour depth of the same row of piles and the difference in the scour depth of the upstream pile and the downstream pile, are included to study the influence of scour on the foundation. Several elasto-plastic static pushover analyses are performed on this finite element model. The analysis results indicate that the seismic capacity （or supply） of the foundation is in the worst condition when the predicted deepest global scout depth is reached, and the capacity becomes larger when the local scour depth is below the predicted deepest global scout depth. Therefore, to evaluate the seismic capacity of a foundation, only the predicted deepest global scout depth should be considered. The method used in this paper can be also applied to foundations with other soil types.

关键词： riverbed scour high-rise pile cap pile group fiber element seismic capacity pushover p-y element

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Performance-based concept on seismic evaluation of existing bridges

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Earthquake Engineering and Engineering Vibration 2009年第1期8卷 127-135页

作者： Yu-Chi Sung Wen-I Liaoi W.Phillip Yen Department of Civil Engineering Taipei University of Technology Taipei 10608 Chinese Taipei Office of lnfrastructure R＆D Federal Highway Administration 6300 Georgetown Pike McLean VA 20121 USA

Conventional seismic evaluation of existing bridges explores the ability of a bridge to survive under significant earthquake excitations. This approach has several major drawbacks, such as only a single structural performance of near collapse is considered, and the simplified approach of adopting strength-based concept to indirectly estimate the nonlinear behavior of a structure lacks accuracy. As a result, performance-based concepts that include a wider variety of structural performance states of a given bridge excited by different levels of earthquake intensity is needed by the engineering community. This paper introduces an improved process for the seismic evaluation of existing bridges. The relationship between the overall structural performance and earthquakes with varying levels of peak ground acceleration （PGA） can successfully be linked. A universal perspective on the seismic evaluation of bridges over their entire life-cycle can be easily obtained to investigate multiple performance objectives. The accuracy of the proposed method, based on pushover analysis, is proven in a case study that compares the results from the proposed procedure with additional nonlinear time history analyses.

关键词： pushover analysis plastic hinge seismic capacity seismic demand performance-based concepts

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seismic damage of mountain tunnels during the 5.12 Wenchuan earthquake

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Journal of Mountain Science 2016年第11期13卷 1958-1972页

作者： YU Hai-tao CHEN Jun-tao YUAN Yong ZHAO Xu Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Technology Beijing 100124 China

A number of mountain tunnels suffered significant damage to various extent during the 2008 Wenchuan earthquake in *** ranging from small to heavy cracking was observed both at the portal and inside the tunnels,while some sections close to the faults completely collapsed.A summary of qualitative data collected from reports and papers is presented regarding the behavior of the 55 mountain tunnels near the epicenter during the *** on the seismic investigation and data collection of mountain tunnels,the tunnel damage is classified into six most common damage models involving cracking,spalling,shear failure,dislocation,pavement uplift and *** study and discussion are then carried out on the damage *** order to examine the influencing factors of the damage magnitude of the mountain tunnels,the correlations between epicentral distance,earthquake intensity,overburden depth,geological condition and damage levels are *** relationships between earthquake parameters and different damagemodels are developed and ***,suggestions are provided to improve the seismic resistance of mountain tunnels.

关键词： Wenchuan earthquake Mountain tunnels Damage model Influencing factors seismic capacity

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