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Earthquake Engineering and Engineering Vibration 2023年第4期22卷 965-977页

作者： Zhang Panpan Zhang Lei Zhang Zhen School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

The performance of clay-pile-pier system under earthquake shaking was comprehensively examined via three-dimensional finite element analyses,in which the complex stress-strain relationships of a clay and piled pier system were depicted by a hyperbolic-hysteretic and an equivalent elastoplastic model,respectively.One hundred twenty ground motions with varying peak accelerations were considered,along with the variations in bridge superstructure mass and pile flexural rigidity.Comprehensive comparison studies suggested that peak pile-cap acceleration and peak pile-cap velocity are the optimal ground motion intensity measures for seismic responses of the pier and the pile,respectively.Furthermore,based on two optimal ground motion intensity measures and using curvature ductility to quantify different damage states,seismic fragility analyses were performed.The pier generally had no evident damage except when the bridge girder mass was equal to 960 t,which seemed to be comparatively insensitive to the varying pile flexural rigidity.In comparison,the pile was found to be more vulnerable to seismic damage and its failure probabilities tended to clearly reduce with the increment of pile flexural rigidity,while the influence of the bridge girder mass was relatively minor.

关键词： clay-pile-pier system seismic fragility analysis ground motion intensity measures damage probability

Influence of self-similar stresses on scenario earthquake construction:An example along the Tanlu Fault

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Science China Earth Sciences 2024年第5期67卷 1687-1697页

作者： Feng HU Huajian YAO Houyun YU Zeyu LU Jieyi HOU Song LUO Zhigang SHAO Xiaofei CHEN School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China Mengcheng Geophysical National Field Scientific Observatory Hefei 230026China Department of Earth and Space Science Southern University of Science and TechnologyShenzhen 518055China Institute of Earthquake Prediction China Earthquake AdministrationBeijing 100036China

As a famous deep and large fault in eastern China,the Tanlu Fault passes through Anhui,Jiangsu,and Shandong and into northeastern China.It is important to improve the understanding of seismic hazard assessments in areas near faults.We start a scenario earthquake simulation in the M7.5 earthquake potential area of the Xinyi-Sihong segment of the Tanlu Fault.The fault rupture length and width are constrained according to the scaling law of large intraplate earthquakes,the background normal stress is depth dependent,and the initial shear stresses are determined using trial and error by matching the earthquake magnitude.Considering the 120 km rupture length of the M7.5 earthquake,we compare the horizontal uniform stress model and self-similar stress perturbation model.Our findings reveal that the seismic source time function of the horizontal uniform stress model is similar to that of the Haskell model and that of the self-similar stress perturbation model is more similar to that of a real earthquake case.We compare the dynamic rupture simulation and ground motion results under four different stress conditions and find that the shorter the characteristic length of the self-similar function is,the rougher the initial stress.For the M7.5earthquake with an epicenter in the vicinity of Suqian,the Xinyi-Tancheng segment,which is located in the IX-intensity zone north of the epicenter,vibrates more strongly on the northern side than on the southern side due to the influence of the lowvelocity zone and the peak slip rate.The response spectra analysis at stations in the study area is useful for improving the earthquake resistance capability.

关键词： Scenario earthquakes Self-similar stress Tanlu Fault Dynamic rupture ground motion

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

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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 motions.To 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 motions.The identified pulses are tested in predicting the rocking consequences of slender rectangular blocks under the original ground motions.Generally,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

ground motion improvements in SPEAR3

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Chinese Physics C 2016年第9期40卷 164-170页

作者： James A.Safranek Yiton T.Yan Domenico Dell’Orco Georg Gassner Nikita Sunilkumar SLAC National Accelerator Laboratory Stanford University Northwestern University Kellogg School of Management

SPEAR3 is a third-generation synchrotron light source storage ring, about 234 meters in circumference.To meet the beam stability requirement, our goal is to ultimately achieve an orbit variation（relative to the photon beam lines） of less than 10% of the beam size, which is about 1 micron in the vertical plane. Hydrostatic leveling system（HLS） measurements show that the height of the SPEAR3 tunnel floor can vary by tens of microns daily without thermal insulation improvements. We present an analysis of the HLS data that shows that adding thermal insulation to the concrete walls of the storage ring tunnel dramatically decreased diurnal tunnel floor motion.

关键词： accelerator synchrotron radiation optics heat ground motion

Characteristics of near-fault ground motion containing velocity pulses

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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

Effect of seismic super-shear rupture on the directivity of ground motion acceleration

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Earthquake Engineering and Engineering Vibration 2013年第4期12卷 519-527页

作者： Hu Jinjun Xie Lili Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration School of Civil Engineering and Architecture Harbin Institute of Technology

The effect of seismic super-shear rupture on the directivity of ground motions using simulated accelerations of a vertical strike-slip fault model is the topic of this study. The discrete wave number/finite element method was adopted to calculate the ground motion in the horizontal layered half space. An analysis of peak ground acceleration （PGA） indicates that similar to the sub-shear situation, directivity also exists in the super-shear situation. However, there are some differences as tbllows：（1） The PGA of the fault-normal component decreases with super-shear velocity, and the areas that were significantly affected by directivity in the PGA field changed from a cone-shaped region in the forward direction in a sub-shear situation to a limited near-fault region in a super-shear situation. （2） The PGA of the fault-parallel and vertical component is not as sensitive as the fault-normal component to the increasing super-shear velocity. （3） The PGA of the fault-normal component is not always greater than the fault-parallel component when the rupture velocity exceeds the shear wave velocity.

关键词： ground motion directivity rupture velocity super-shear rupture peak ground acceleration

Influence of earthquake ground motion incoherency on multi-support structures

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Earthquake Engineering and Engineering Vibration 2002年第2期1卷 167-180页

作者：杨庆山 M.Saiid Saiidi 王航 Ahmad Itani School of Civil Engineering and Architecture Northern Jiaotong University.Beijing.100044.China. Department of Civil Engineering University of NevadaRenoNV89557USA Beijing General Municipal Engineering Design and Research Institute.China Department of Civil Engineering University of Nevada.RenoNV.89557USA

A linear response history analysis method is used to determine the influence of three factors:geometric incoherency,wave-passage,and local site characteristics on the response of lnulti-support structures subjected to differential ground motions.A one-span frame and a reduced model of a 24-span bridge,located in Las Vegas,Nevada are studied,in which the influence of each of the three factors and their combinations are analyzed.It is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response,which does not exist in structures subjected to uniform excitation.The total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation.

关键词： earthquake bridges ground motion incoherency wave passage local site characteristics multi-support structures

Measurement of six degree-of-freedom ground motion by using eight accelerometers

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Earthquake Engineering and Engineering Vibration 2005年第2期4卷 229-232页

作者：杨振宇沈毅刘志言 Department of Control Science and Engineering Harbin Institute of TechnologyHarbin 150001China Ph.D.Cadidate Department of Control Science and Engineering Harbin Institute of TechnologyHarbin 150001China Professor

A new integrated measuring system with eight force-balance accelerometers is proposed to obtain a direct measurement of six degree-of freedom （DOF） ground motions, including three rotational and three actual translational acceleration components without gyroscopes. In the proposed measuring system, the relationship between the output from eight force-balance accelerometer and the six DOF motion of the measuring system under an earthquake are described by differential equations. These equations are derived from the positions and directions of the eight force-balance accelerometers in the measuring system. The third-order Runge-Kutta algorithm is used to guarantee the accuracy of the numerical calculation. All the algorithms used to compute the six DOF components of the ground motion are implemented in a real-time in Digital Signal Processor （DSP）. The distortion of the measured results caused by position and direction errors of the accelerometers in the measuring system are reduced by multiplying a compensation coefficient C to the output and subtracting static zero drift from the measured results, respectively.

关键词： six degree-of-freedom ground motion force-balance accelerometer translational acceleration rotational acceleration

Acceleration　record　and　characteristics　of　ground　motion　at　an　epicentral　distance　of　200　km

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Acta Seismologica Sinica(English Edition) 1994年第3期7卷 501-505页

作者：田玉红王培德 Institute of Geophysics State Seismological Bureau Beijing China

Ａｃｃｅｌｅｒａｔｉｏｎｒｅｃｏｒｄａｎｄｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｇｒｏｕｎｄｍｏｔｉｏｎａｔａｎｅｐｉｃｅｎｔｒａｌｄｉｓｔａｎｃｅｏｆ２００ｋｍＹｕ－ＨｏｎｇＴＩＡＮ（田玉红）ａｎｄＰｅｉ－ＤｅＷＡＮＧ... 详细信息

Ａｃｃｅｌｅｒａｔｉｏｎｒｅｃｏｒｄａｎｄｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｇｒｏｕｎｄｍｏｔｉｏｎａｔａｎｅｐｉｃｅｎｔｒａｌｄｉｓｔａｎｃｅｏｆ２００ｋｍＹｕ－ＨｏｎｇＴＩＡＮ（田玉红）ａｎｄＰｅｉ－ＤｅＷＡＮＧ（王培德）（Ｉｎｓｔｉｔｕｔｅｏｆ...

关键词： ground motion Response Spectrum Epicentral Distance Acceleration Record Horizontal Peak Acceleration

Development of attenuation relation for the near fault ground motion from the characteristic earthquake

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Acta Seismologica Sinica(English Edition) 2007年第4期20卷 416-424页

作者：史保平刘博研张健 Graduate University of Chinese Academy of Sciences

A composite source model has been used to simulate a broadband strong ground motion with an associated fault rupture process. A scenario earthquake fault model has been used to generate 1 000 earthquake events with a magni- tude of MwS.0. The simulated results show that, for the characteristic event with a strike-slip faulting, the character- istics of near fault ground motion is strongly dependent on the rupture directivity. If the distance between the sites and fault was given, the ground motion in the forward direction （Site A） is much larger than that in the backward direction （Site C） and that close to the fault （Site B）. The SH waves radiated from the fault, which corresponds to the fault-normal component plays a key role in the ground motion amplification. Corresponding to the sites A, B, and C, the statistical analysis shows that the ratio of their aPG is 2.15：1.5：1 and their standard deviations are about 0.12, 0.11 and 0.13, respectively. If these results are applied in the current probabilistic seismic hazard analysis （PSHA）, then, for the lower annual frequency of exceedance of peak ground acceleration, the predicted aPG from the hazard curve could reduce by 30% or more compared with the current PSHA model used in the developing of seismic hazard map in the USA. Therefore, with a consideration of near fault ground motion caused by the rupture directivity, the re- gression model used in the development of the regional attenuation relation should be modified accordingly.

关键词： rupture directivity ground motion peak ground acceleration