检索结果-南通市图书馆

pulses in ground motions identified through surface partial matching and their impact on seismic rocking consequence

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2024年第1期23卷 35-50页

作者： Tang Yuchuan Wang Jiankang Wu Gang School of Civil Engineering Southeast UniversityKey Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of EducationNanjing 211102China National and Local Joint Engineering Research Center for Intelligent Construction and Maintenance Nanjing 211102China

In seismology and earthquake engineering,it is fundamental to identify and characterize the pulse-like features in pulse-type ground *** capture the pulses that dominate structural responses,this study establishes congruence and shift relationships between response spectrum surfaces.A similarity search between spectrum surfaces,supplemented with a similarity search in time series,has been applied to characterize the pulse-like features in pulse-type ground *** identified pulses are tested in predicting the rocking consequences of slender rectangular blocks under the original ground ***,the prediction is promising for the majority of the ground motions where the dominant pulse is correctly identified.

关键词： velocity pulse ground motion surface similarity rocking overturning

Analysis of faulting destruction and water supply pipeline damage from the first mainshock of the February 6,2023 Türkiye earthquake doublet

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2024年第1期37卷 78-90页

作者： Xiaoqing Fan Libao Zhang Juke Wang Yefei Ren Aiwen Liu Institute of Geophysics China Earthquake AdministrationBeijing 100081China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

In 2023,two consecutive earthquakes exceeding a magnitude of 7 occurred in Türkiye,causing severe casualties and economic *** damage to critical urban infrastructure and building structures,including highways,railroads,and water supply pipelines,was particularly severe in areas where these structures intersected the seismogenic *** infrastructure projects that traverse active faults are susceptible to the influence of fault movement,pulse velocity,and ground *** this study,we used a unique approach to analyze the acceleration records obtained from the seismic station array(9 strong ground motion stations)located along the East Anatolian Fault(the seismogenic fault of the MW7.8 mainshock of the 2023 Türkiye earthquake doublet).The acceleration records were filtered and integrated to obtain the velocity and displacement time *** used the results of an on-site investigation,jointly conducted by China Earthquake Administration and Türkiye’s AFAD,to analyze the distribution of PGA,PGV,and PGD recorded by the strong motion array of the East Anatolian *** found that the maximum horizontal PGA in this earthquake was 3.0 g,and the maximum co-seismic surface displacement caused by the East Anatolian Fault rupture was 6.50 *** the fault rupture propagated southwest,the velocity pulse caused by the directional effect of the rupture increased gradually,with the maximum PGA reaching 162.3 cm/*** also discussed the seismic safety of critical infrastructure projects traversing active faults,using two case studies of water supply pipelines in Türkiye that were damaged by *** used a three-dimensional finite element model of the PE(polyethylene)water pipeline at the Islahiye State Hospital and fault displacement observations obtained through on-site investigation to analyze pipeline failure *** further investigated the effect of the fault-crossing angle on seismic safety of a pipeline,based on our analysis and the failure p

关键词： Türkiye earthquake fault displacement near-fault ground motion velocity pulse water supply pipeline

Characteristics of near-fault ground motion containing velocity pulses

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2006年第6期19卷 677-686页

作者：韦韬赵凤新张郁山 Institute of Geophysics China Earthquake AdministrationBeijing 100081 China Guilin Institute of Technology Guilin 541004 China Institute of Geophysics China Earthquake AdministrationBeijing 100081 China

There are many reports about the research on near-fault velocity pulses, which focus on the generation of velocity pulse and simplify the velocity pulse so as to be used in the seismic design of structure, However few researches have put emphasis on the characteristics of near-fault ground motions containing velocity pulses, especially the characteristics relevant with the design response spectrum prescribed by the code. Through collection of a large number of near-fault records containing velocity pulses, the response spectra and the characteristic periods of records containing no pulses are compared with those of records containing pulses. Response spectra of near-fault records are compared with standard spectra given by code; furthermore, the response spectra and the characteristic periods of each earthquake are compared with that given by code. The result shows that at long periods （longer than 1.5 s）, the response spectrum of pulse-containing records is bigger than the response spectrum of no-pulse-containing records; when the characteristic period of near-fault records is calculated, the method that does not fix frequency is more reasonable because the T1 and T2 have a lagging tendency; regardless of the site Ⅰ and site Ⅱ, the characteristic period of pulse-containing records is over twice bigger than the characteristic period given by the code,

关键词： near-fault velocity pulse ground motion response spectrum characteristic period

Relative energy zero ratio-based approach for identifying pulse-like ground motions

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2020年第1期19卷 1-16页

作者： Liu Ping Li Ning Ma Hua Xie Lili Zhou Baofeng School of Civil Engineering/Key Laboratory of Coast Civil Structure Safety Ministry of Education(Tianjin University)Tianjin 300072China Ren’ai College Tianjin UniversityTianjin 301636China Key Laboratory of Earthquake Engineering Simulation and Seismic Resilience of China Earthquake Administration(Tianjin University) Tianjin 300350China Key Laboratory of Engineering and Structural Retrofi t Beijing University of TechnologyBeijing 100124China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China

pulse-like ground motions are capable of inflicting significant damage to structures. Efficient classification of pulse-like ground motion is of great importance when performing the seismic assessment in near-fault regions. In this study, a new method for identifying the velocity pulses is proposed, based on different trends of two parameters: the short-time energy and the short-time zero crossing rate of a ground motion record. A new pulse indicator, the relative energy zero ratio(REZR), is defined to qualitatively identify pulse-like features. The threshold for pulse-like ground motions is derived and compared with two other identification methods through statistical analysis. The proposed procedure not only shows good accuracy and efficiency when identifying pulse-like ground motions but also exhibits good performance for classifying records with high-frequency noise and discontinuous pulses. The REZR method does not require a waveform formula to express and fit the potential velocity pulses;it is a purely signal-based classification method. Finally, the proposed procedure is used to evaluate the contribution of pulse-like motions to the total input energy of a seismic record, which dramatically increases the seismic damage potential.

关键词： pulse-like ground motion velocity pulse relative energy zero-crossing ratio short-time input energy shorttime zero crossing rate

Effect of near-fault earthquakes with forward directivity on telecommunication towers

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2011年第2期10卷 211-218页

作者： M.Yahyai B.Rezayibana E.Mohammadrezapour Department of Civil Engineering K.N. Toosi University of Technology Islamic Azad University

In this paper, the effect of pulse-type motions caused by forward directivity that can release huge amounts of energy in a short time period is studied on a telecommunication tower. Since telecommunication towers have longer periods, they are not as affected by seismic forces. Nevertheless, near source earthquakes characterized by high velocity and velocity pulses can change the behavior of these structures. For this reason, a telecommunication tower located near active faults was selected in this study. Considering the probable earthquake magnitude at the site and the distance of the tower from adjacent faults, nine simulated pulses and three near-fault earthquake records with forward directivity are selected and applied to a 3D finite element model of the tower. The results of nonlinear dynamic analysis, i.e., displacements and damage in the tower, indicate that the maximum displacement and drift ratio of the tower under the pulses are obviously affected by the ratio of the structure period to pulse period. When this ratio is decreased and close to 1.0, the maximum displacement and drift ratio are sharply increased and cause large displacements in the tower.

关键词： near-fault earthquake velocity pulse nonlinear dynamic analysis drift ratio

Dynamic behavior and applicability of lead alloy absorber

在线全文

学校读者我要写书评

暂无评论

Acta Seismologica Sinica(English Edition) 2005年第1期18卷 89-98,125页

作者：李亚琦李小军刘锡荟 Institute of Geophysics China Earthquake Administration Earthquake Engineering Research Center China Earthquake Administration

The paper describes the damping effect of lead alloy absorber (LAA) by shake table test and finite element method of a kind of high-voltage electrical equipment, LW11-252/Q SF6 Circuit Breaker (LSCB). The strain reduction of the porcelain bushing of LSCB is defined as the damping effect of LAA in the paper based on the damage pattern of test equipment under earthquake. The test results show that LAA has reduced the acceleration response and strain response of the LSCB, at the same time, it does not increase the displacement response of the LSCB. There is a reduction of 30% in the strain of porcelain pipe. Moreover, the stronger the input ground motion is, the larger the reduction will be. The finite element method also indicates the damping effect of LAA, especially under ground motions with significant long period contents and ground motions with velocity pulse. Combined with the test results and calculation results, the paper gives the applicability of LAA finally.

关键词： lead alloy absorber long period velocity pulse

Identification of acceleration pulses in near-fault ground motion using the EMD method

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2005年第2期4卷 201-212页

作者：张郁山胡聿贤赵凤新梁建文杨彩红 Department of Civil Engineering Tianjin UniversityTianjin 300072China Ph.D.student Institute of Geophysics China Earthquake AdministrationBeijing 100081China Professor Department of Civil Engineering Tianjin UniversityTianjin 300072China Professor Department of Civil Engineering Tianjin UniversityTianjin 300072China GraduateStudent

In this paper, response spectral characteristics of one-, two-, and three-lobe sinusoidal acceleration pulses are investigated, and some of their basic properties are derived. Furthermore, the empirical mode decomposition （EMD） method is utilized as an adaptive filter to decompose the near-fault pulse-like ground motions, which were recorded during the September 20, 1999, Chi-Chi earthquake. These ground motions contain distinct velocity pulses, and were decomposed into high-frequency （HF） and low-frequency （LF） components, from which the corresponding HF acceleration pulse （if existing） and LF acceleration pulse could be easily identified and detected. Finally, the identified acceleration pulses are modeled by simplified sinusoidal approximations, whose dynamic behaviors are compared to those of the original acceleration pulses as well as to those of the original HF and LF acceleration components in the context of elastic response spectra. It was demonstrated that it is just the acceleration pulses contained in the near-fault pulse-like ground motion that fundamentally dominate the special impulsive dynamic behaviors of such motion in an engineering sense. The motion thus has a greater potential to cause severe damage than the far-field ground motions, i.e. they impose high base shear demands on engineering structures as well as placing very high deformation demands on long-period structures.

关键词： acceleration pulse velocity pulse near-fault pulse-like ground motion empirical mode decomposition(EMD) response spectrum