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Development of Design response spectra Based on Various Attenuation Relationships at Specific Location

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Journal of Civil Engineering and Architecture 2013年第12期7卷 1501-1506页

作者： Hapsa Husen Taksiah Abdul Majid Fadzli Mohamed Nazri Mohd Rashwan Arshad Ade Faisal Sift Khadijah Che Osmi Civil Engineering Department Faculty of Engineering Universiti Pertahanan Nasional Malaysia Kuala Lumpur 57000Malaysia School of Civil Engineering Universiti Sains Malaysia Pulau Pinang 14300 Malaysia

Peninsular Malaysia is located and lies in a low seismic region. Although Malaysia is not located in the active fault seismic area, it is closed to the Sumatran active seismic zones. Tall building are fIequently felt the tremor generated fTom Sumatran subduction and fault zones especially in the west cost of Peninsular Malaysia such as Johor Bahru, Kuala Lumpur and Penang. Existing design response spectra was developed based on attenuation relationship for each subduction and fault zone. In this study, the design response spectra were developed based on various attenuation relationships for selected location in Kuala Lumpur area, namely, Mutiara Damansara, Bandar Petaling Jaya and Bandar Puteri Puchong. The development of design response spectra based on various attenuation relationships is more reliable in selecting the appropriate attenuation relationship for the study area. Seven attenuations have been chosen and results show that Megawati et al. are the most appropriate attenuation relation for fault zone, where the predicted PGA （peak ground acceleration） is 0.0187 g which is the proposed PGA value for this study area. This study also found that most of soil in the study area can be categorized into SD （stiff soil） according to site classification in the NEHRP 2000 Provision/UBC 97. Bandar petaling Jaya was found to be highest AF （amplification factor） of 3.74 for stiff soil and Mutiara Damansara with AF of 2.67 for very dense soil or soft rock. The proposed design response spectra for each location were developed based on UBC 1997 （Uniform Building Code 1997）. The peak RSA （response spectrum acceleration） of 0.30 g for soil type SD for Bandar Petaling Jaya is the maximum level of acceleration on the soil surface with a period range of 0.10 to 0.52 seconds. All these values can be used for the seismic safety evaluation of existing structures and as a guideline in designing new structures to resist future earthquake, within the study area.

关键词： Attenuation relationship PGA (peak ground acceleration) response spectrum acceleration response spectra Sumatra subduction zone Sumatra fault zone.

Strength reduction factors for seismic analyses of buildings exposed to near-fault ground motions

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Earthquake Engineering and Engineering Vibration 2011年第2期10卷 195-209页

作者： Qu Honglue Zhang Jianjing J.X. Zhao School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China Institute of Geological ＆ Nuclear Sciences PO Box 30-368 Lower Hutt New Zealand

To estimate the near-fault inelastic response spectra, the accuracy of six existing strength reduction factors （R） proposed by different investigators were evaluated by using a suite of near-fault earthquake records with directivity-induced pulses. In the evaluation, the force-deformation relationship is modelled by elastic-perfectly plastic, bilinear and stiffness degrading models, and two site conditions, rock and soil, are considered. The R-value ratio （ratio of the R value obtained from the existing R-expressions （or the R-p-T relationships） to that from inelastic analyses） is used as a measurement parameter. Results show that the R-expressions proposed by Ordaz ＆ Perez-Rocha are the most suitable for near-fault ground motions, followed by the Newmark ＆ Hall and the Berrill et al. relationships. Based on an analysis using the near-fault ground motion dataset, new expressions of R that consider the effects of site conditions are presented and verified.

关键词： strength reduction factors near-fault ground motion response spectra force-deformation relationship

A neural network based methodology to predict site-specific spectral acceleration values

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 459-472页

作者： Kamatchi P Rajasankar J Ramana GV Nagpal AK CSIR-Structural Engineering Research Centre CSIR Campus Dept. Civil. Eng. IIT Delhi New Delhi 110 016 India

A general neural network based methodology that has the potential to replace the computationally-intensive site-specific seismic analysis of structures is proposed in this paper. The basic framework of the methodology consists of a feed forward back propagation neural network algorithm with one hidden layer to represent the seismic potential of a region and soil amplification effects. The methodology is implemented and verified with parameters corresponding to Delhi city in India. For this purpose, strong ground motions are generated at bedrock level for a chosen site in Delhi due to earthquakes considered to originate from the central seismic gap of the Himalayan belt using necessary geological as well as geotechnical data. Surface level ground motions and corresponding site-specific response spectra are obtained by using a one-dimensional equivalent linear wave propagation model. spectral acceleration values are considered as a target parameter to verify the performance of the methodology. Numerical studies carried out to validate the proposed methodology show that the errors in predicted spectral acceleration values are within acceptable limits for design purposes. The methodology is general in the sense that it can be applied to other seismically vulnerable regions and also can be updated by including more parameters depending on the state-of-the-art in the subject.

关键词： neural network response spectra local soil conditions amplification factor

Investigation on directional effects of Vrancea subcrustal earthquakes

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Earthquake Engineering and Engineering Vibration 2015年第3期14卷 399-410页

作者： Florin Pavel Radu Vacareanu Mircea Radulian Carmen Cioflan Seismic Risk Assessment Center Technical University of Civil Engineering Bucharest National Institute for Earth Physics (INFP)

This paper evaluates possible directional effects from strong ground motions recorded during the last four significant subcrustal earthquakes produced in the Vrancea seismic zone（Romania） in August 1986（Mw=7.1）,May 1990（Mw=6.9 and 6.4） and October 2004（Mw=6.0）.Several measures of the horizontal component of the ground motion given in the literature（Boore et al.,2006;Boore,2010） are computed and are related to the geometric mean of the as-recorded horizontal *** method is applied in order to quantify the influence of the earthquake magnitude and of the soil class on some strong ground motion parameters（*** intensity,PGV/PGA,or mean period TM）.The study of the directional effects is performed using the distribution of IJMAand of the rotation angle corresponding to a measure of the horizontal component of the ground motion（RotD 100） and the results reveal a visible directional pattern for IJMA,while in the case of RotD100 the directional patterns are less visible.

关键词： response spectra horizontal ground motion directio

Dominant pulse simulation of near fault ground motions

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Earthquake Engineering and Engineering Vibration 2013年第2期12卷 267-278页

作者： S.R. Hoseini Vaez M.K. Sharbatdar G. Ghodrati Amiri H. Naderpour A. Kheyroddin Department of Civil Engineering Faculty of EngineeringUniversity of Qom Faculty of Civil Engineering Semnan University Center of Excellence for Fundamental Studies in Structural Engineering School of Civil EngineeringIran University of Science and Technology

In this study, a new mathematical model is developed composed of two parts, including harmonic and polynomial expressions for simulating the dominant velocity pulse of near fault ground motions. Based on a proposed velocity function, the corresponding expressions for the ground acceleration and displacement time histories are also derived. The proposed model is then fitted using some selected pulse-like near fault ground motions in the Next Generation Attenuation （NGA） project library. The new model is not only simple in form but also simulates the long-period portion of actual velocity near fault records with a high level of precision. It is shown that the proposed model-based elastic response spectra are compatible with the near fault records in the neighborhood of the prevailing frequency of the pulse. The results indicate that the proposed model adequately simulates the components of the time histories. Finally, the energy of the proposed pulse was compared with the energy of the actual record to confirm the compatibility.

关键词： dominant pulse near fault ground motions forward directivity response spectra simulation

Seismic ground amplification induced by box-shaped tunnels

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Earthquake Engineering and Engineering Vibration 2022年第3期21卷 697-714页

作者： Damoon Feizi Jafar Asgari Marnani Hamid Alielahi Mehdi Panji Department of Civil Engineering Faculty of Civil and Earth Resources EngineeringCentral Tehran BranchIslamic Azad UniversityTehranIran Department of Civil Engineering Zanjan BranchIslamic Azad UniversityZanjanIran

The growing use of underground structures,specifically to facilitate urban transportation,highlights the need to scrutinize the effects of such spaces on the seismic ground response as well as the surrounding *** this regard,the seismic ground amplification variations in the vicinity of single and twin box-shaped tunnels subjected to SV waves have been investigated by the finite difference *** evaluate the effects,generalizable dimensionless diagrams based on the results of parametric numerical analysis considering factors such as variations in the tunnels′depth,the distances between the tunnels,tunnel lining flexibility,and input wave frequency,have been *** addition,to assess the effects of underground box-shaped tunnels on the response spectrum of the ground surface,seven selected accelerograms have been matched based on a specific design spectrum for the stiff soil condition of Eurocode 8(CEN,2006).The results underline the significant amplification effect of the box-shaped tunnels on the ground motions,specifically in the case of horizontal twin tunnels,which should be given more attention in current seismic design practices for surface structures.

关键词： seismic amplification box-shaped tunnels response spectra numerical method parametric studies buried depth

Dynamic responses under the excitation of pulse sequences

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Earthquake Engineering and Engineering Vibration 2004年第2期3卷 157-169页

作者：戴君武 Mai Tong George C.Lee 齐霄斋白文婷 Institute of Engineering Mechanics China Earthquake Administration.Harbin 150080China Professor Multidisciplinary Center for Earthquake Engineering Research University at BuffaloBuffaloNY14261USA Senior Research Scientist Multidisciplinary Center for Earthquake Engineering Research University at BuffaloBuffaloNY14261USA Professor Institute of Engineering Mechanics China Earthquake Administration.Harbin 150080China Master student

This paper studies the dynamic responses of SDOF system under pulse-dominant *** purpose of the study is to prepare for scrutiny of some near-field pulse-dominantground motions and their potential to cause structural *** the single pulse dynamics,we consider the effect of pulse *** kind of excitation was particularly obvious in some of previous earthquakes such as Northridge (1994) and Chi-Chi (1995).Based on the duration, peak and rise and decay era of the main pulse as well as its relationship with the predecessor and successor pulses,we propose a classification for the pulse *** studies have been canied out for acceleration,velocity and displacement response spectra of the main pulse with either a predecessor or a successor *** analysis also includes general response behaviors in different fundamental period segments and special aspects of response at certain points (e.g.,the corresponding peak points).

关键词： pulse sequences near-field ground motions triangle pulse representation Chi-Chi earthquake response spectra

Attenuation characteristics of ground motions in northern China

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Earthquake Engineering and Engineering Vibration 2002年第2期1卷 161-166页

作者：黄玉龙赵兴权罗奇峰 Department of Civil and Structural Engineering.The Hong Kong Polytechnic University.Hung Hom.Kowloon Hong KongChina Institute of Geological & Nuclear Sciences P.O.Box 30 368GracefieldLower HuttNew Zealand Research Institute of Structural Engineering & Disaster Reduction.Tongji University.Siping Rd 1239.Shanghai 200092 China

Four recently developed attenuation models are calibrated by using a very limited amount of strong motion data recorded in *** research shows that the attenuation characteristics of the earthquake shaking in northern China are similar to those in the western *** supporting evidence includes Q factors,preliminary results of kappa values,stress drop, shear wave velocity profile in the shallow earth crust,areas enclosed by the isoseismals of Modified Mercalli Intensity *** these comparison,s of different attenuation models,it is recommended that the Crouse and McGuire spectral attenuation model could possibly be used for northern China.

关键词： strong ground motions response spectra attenuation model western US northern China

Determination of horizontal and vertical design spectra based on ground motion records at Lali tunnel, Iran

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Earthquake Science 2012年第4期25卷 315-322页

作者： F Moradpouri M Mojarab Faculty of Mining Petroleum & Geophysics Shahrood University of Technology School of Mining College of Engineering University of Tehran

Most acceleration diagrams show high levels of unpredictability, as a result, it is the best to avoid using diagrams of earthquake acceleration spect~＇a, even if the diagrams recorded at the site in question. In order to design earthquake resistant structures, we, instead, suggest constructing a design spectrum using a set of spectra that have common characteristics to the recorded acceleration diagrams at a particular site and smoothing the associated data. In this study, we conducted a time history analysis and determined a design spectrum for the region near the Lali tunnel in Southwestern Iran. We selected 13 specific ground motion records from the rock site to construct the design spectrum. To process the data, we first applied a base-line correction and then calculated the signal-to-noise ratio （]~SN） for each record. Next, we calculated the Fourier amplitude spectra of the acceleration pertaining to the signal window （1）, and the Fourier amplitude spectra of the associated noise （2）. After dividing each spectra by the square root of the selected window interval, they were divided by each other （1 divided by 2）, in order to obtain the ~SN ratio （filtering was also applied）. In addition, all data were normalized to the peak ground acceleration （PGA）. Next, the normalized vertical and horizontal responses and mean response spectrum （50%） and the mean plus-one standard deviation （84%） were calculated for all the selected ground motion records at 5% damping. Finally, the mean design spectrum and the mean plus-one standard deviation were plotted for the spectrums. The equation of the mean and the above-mean design spectrum at the Lali tunnel site are also provided, along with our observed conclusions.

关键词： Lali tunnel ground motion record response spectra design spectra signal processing