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Source model of the great Wenchuan earthquake 8.0 for synthesis of strong ground motion

Tumu Gongcheng Xuebao/China Civil engineering Journal 2013年第SUPPL.1期46卷 139-145页

作者： Liu, Haiming Tao, Xiaxin State Key Laboratory of Bridge Engineering Structural Dynamics China Merchants Chongqing Communication Research and Design Institute Co. Ltd. Chongqing 400067 China Harbin Institute of Technology Harbin 150090 China

A finite fault based hybrid source model of the great Wenchuan earthquake with magnitude 8.0 is built in this paper. The global parameters are mainly determined from the regional seismo-tectonics, structure of the crust, seismicity and a set of semi-experiential calibration laws. The local parameters consist of two groups. One is on asperity, the other one is on k square distribution. Both of them are generated from the truncated Normal distribution with mean and standard deviation values estimated by a set of calibration laws. 30 source models are presented finally.

关键词： Calibration

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Seismic responses of a continuous rigid-framed bridge subjected to multi-support evolutionary random excitations

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Tumu Gongcheng Xuebao/China Civil engineering Journal 2013年第SUPPL.2期46卷 249-254页

作者： Song, Gang Wang, Feilan State Key Laboratory of Bridge Structural Dynamics China Merchants Chongqing Communications Research and Design Institute Co. Ltd. Chongqing 400067 China Chongqing Real Estate College Chongqing 401331 China

Seismic behavior of a long-span continuous rigid-framed bridge under multi-support earthquake excitations was studied, with traveling wave effects of ground motion considered. The earthquake excitations were regarded as non-uniformly modulated evolutionary random processes and Priestley's mathematical model was adopted. Priestley's model takes into account the non-stationary characteristics not only of the excitation intensity, but also of the excitation frequency components. The relevant computation of long-span structures subjected to non-uniformly modulated evolutionary random excitations was solved by using pseudo excitation method, which is an accurate and very efficient way for stochastic vibration analysis of structures. Seismic waves were assumed to spread along the longitudinal bridge, and different seismic apparent wave velocity was investigated. Seismic responses of the bridge under the longitudinal, transverse and vertical ground motion inputs were simulated respectively. Simulation results show that it's necessary to consider the spatially varying effects of ground motions in the seismic analysis of long-span continuous rigid-framed bridges. If the spatially varying effects of ground motions are neglected, in some cases it may lead to unsafe seismic design.

关键词： Seismic response

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Synthesis of strong ground motions at two rock stations during the great Wenchuan earthquake

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Tumu Gongcheng Xuebao/China Civil engineering Journal 2013年第SUPPL.1期46卷 123-126页

作者： Tao, Xiaxin Liu, Haiming Wang, Liyuan Jiang, Wei Harbin Institute of Technology Harbin 150090 China Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China State Key Laboratory of Bridge Engineering Structural Dynamics China Merchants Chongqing Communication Research and Design Institute Co. Ltd. Chongqing 400067 China

In order to deal with the ground motion effect on two dam sites in the great Wenchuan earthquake with magnitude 8.0, motions at two nearby observation stations where strong motion were recorded in the shock are synthesized from 30 finite fault based hybrid source models and inversed regional parameters of source spectrum and motion attenuation. The synthesized acceleration time histories and peak values are compared with the recordings, and the result shows that the motions synthesized are larger than those recorded by 25%~37%. The further study on the object and strategy of the regional parameter inversion is suggested.

关键词： Earthquake effects

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An efficient stochastic optimal control algorithm for vehicle suspensions

An efficient stochastic optimal control algorithm for vehicl...

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2012 IEEE International Conference on Computer Science and Automation engineering, CSAE 2012

作者： Song, G. Lin, J.H. Zhang, Y.H. Kennedy, D. Williams, F.W. State Key Laboratory of Bridge Structural Dynamics China Merchants Chongqing Communications Research and Design Institute Co. Ltd. Chongqing China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian China Cardiff School of Engineering Cardiff University United Kingdom

ISBN: (纸本)9781467300865

A highly efficient and accurate stochastic optimal control algorithm is proposed for active vehicle suspension systems. It uses the pseudo-excitation method for random vibration and the precise integration method (PIM) for the solution of the Riccati equations. Unlike conventional time-domain based methods, the present method computes the power spectral density (PSD) of each vehicle response directly from the road surface elevation PSD. Therefore root mean squares of the vehicle responses, including the frequency-weighted acceleration ones required by the ISO standard 2631-1(1997), can be obtained conveniently and accurately. The PIM used is proved to be numerically stable and highly precise, even if all eigenvalues of the corresponding Hamiltonian matrices are very close to the imaginary axis. Finally, numerical examples verify the effectiveness of the proposed method. © 2012 IEEE.

关键词： Stochastic systems

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Finite Element Model Updating Based on Field Quasi-static Generalized Influence Line and Its bridge engineering Application

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Procedia engineering 2012年 31卷 348-353页

作者： Jingbo Liao Guangwu Tang Libo Meng Huigeng Liu Youjin Zhang State Key Laboratory of Bridge Engineering Structural Dynamics Chongqing Communications Research & Design Institute Chongqing and 400067 China

Finite element model updating is the important foundation of structural damage detection, condition assessment for engineering structure. A new method for finite element model updating based on the quasi-static generalized influence line (QSGIL) residual objection is presented to update the finite element model in order to improve the quality of finite element algorithm. The experimental study shows that the method can efficiently update the finite element model.

关键词： Finite element model updating Quasi-static generalized influence line (QSGIL) Field test

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Analysis on 3D surface crack transient propagation process

Analysis on 3D surface crack transient propagation process

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2nd International Conference on Civil engineering and Building Materials, CEBM 2012

作者： Guo, Lingli Wong, Robina H.C. Liu, Liqiang Yin, Peng State Key Laboratory of Earthquake Dynamics Institute of Geology China Earthquake Administration Beijing China Department of Civil and Structural Engineering Hong Kong Polytechnic University Hong Kong Hong Kong

ISBN: (纸本)9780415643429

Surface faults, which extend from ground surface to a finite depth, are one of the common tectonic structures found on the earth surface. The mechanism of cracking from surface fault front differs significantly from cracking from the idealized 2-D fault model, which assumes fault extending infinitely into the earth crust. The crack emanating from pre-existing 3-D surface fault is still not fully understood. This paper summarizes our latest endeavor in simulating crack growth from a pre-existing 3-D surface fault. There is a stable period existed between the fully propagation and coalescence and sample failure, and the duration time is several tens milliseconds. The coalescence of the bridge area occurs at the last stage and is a rapid process. The crack initiation is discontinued or linear, but multi points initiate and combine each other random. © 2013 Taylor & Francis Group, London.

关键词： Surface defects

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Coherency between ground motions synthesized for analysis input of a large span structure

Coherency between ground motions synthesized for analysis in...

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8th World Conference on Earthquake Resistant engineering Structures, ERES 2011

作者： Tao, X. Liu, H. Lu, J. Sun, X. Wang, H. Institute of Engineering Mechanics China Earthquake Administration China School of Civil Engineering Harbin Institute of Technology China State Key Laboratory of Bridge Structural Dynamics Chongqing Communication Research and Design Institute China

ISBN: (纸本)9781845645489

In order to fit the requirement of non-consistent input for seismic analysis of a large span structure with multi-supports, coherency of a synthesized ground motion field is validated in this paper. The result shows that the correlation between motions close to each other on rock site is strong, the mean values of coherencies are from 0.7 to 0.8, and the maximum is up to 1.0. The coherency decreases with the distance between the motion points. Correlation between low frequency motions close to each other on soil site is very strong, the mean of coherencies is larger than 0.8. The correlation of low frequency motions decreases also with the distance. The correlation between high frequency motions (>5Hz) is weak, the coherencies corresponding to various distances are all less than 0.5, and the mean is mostly less than 0.25. The result is consistent with the conclusion from the statistics of the observed data on some dense arrays like SMART-1 during the past earthquakes. © 2011 WIT Press.

关键词： Coherency Ground motion Multi-support Non-consistent input Synthesis

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Seismic Performance of Continuous Girder bridges Using Cable-sliding Friction Aseismic Bearing

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Procedia engineering 2011年 14卷 914-921页

作者： Zhenghua Wei Wancheng Yuan Pak-chiu Cheung Xinjian Cao Zhaojun Rong State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University China Department of Civil & Structural Engineering Hong Kong Polytechnic University China Jiangsu Wanbao Bridge Component Co. Ltd. China

This paper reports on the study of the performance of a new seismic control device named as cable-sliding friction aseismic bearing (CSFAB), which combines a conventional aseismic bearing with restrainer cables to dissipate earthquake energy and at the same time to control the displacement of girder to an acceptable value. A twodimensional long-span continuous girder bridge model was developed and analyzed in the study. Considering the influence of different site conditions, the model was subjected to three historic ground motion records applied to different (A,B,C,D) site conditions specified in the USGS site classification. Compared with conventional aseismic bearing, the effectiveness of the CSFAB in controlling the girder displacement and limiting the shear force and bending moment demands on the bridge piers was assessed. Furthermore, study considering different fixed pier heights was conducted and the results showed that with the decrease of height or increase in stiffness of piers, CSFAB was to be more effective.

关键词： cable-sliding friction aseismic bearing continuous girder bridge seismic isolation hysteresis curve restoring force model

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Multi-damage detection based on quasi-static generalized influence line theory 12

Multi-damage detection based on quasi-static generalized inf...

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12th International Conference on Inspection, Appraisal, Repairs and Maintenance of Structures

作者： Guangwu, Tang Jingbo, Liao State Key Laboratory of Bridge Engineering Structural Dynamics Chongqing Communications Research and Design Institute China

ISBN: (纸本)9789810851996

In the past few years, it is an important and challenging task to accurately detect the position and size of damage, especially, the multi-damage detection. In the present paper, a novel approach determining the locating of multi-damage using quasi-static generalized influence line theory (QGIL). The experimental studies demonstrate that the abrupt changes in the location sensitivity indices of quasi-static generalized influence line are just at the corresponding damage zones and hence the approach can be used to locate multiple-damage positions. These features indicate that the damage diagnosing method has significant engineering application value and a promising future.

关键词： Damage detection

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Experimental research and fem analysis of steel corbel in pylon cable anchor zone of cable-stayed bridge

Experimental research and fem analysis of steel corbel in py...

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2010 International Conference of Logistics engineering and Management: Logistics for Sustained Economic Development - Infrastructure, Information, Integration, ICLEM 2010

作者： Bai, Guangliang Tang, Guangwu Gou, Hongye Key Laboratory of Structural Engineering Chongqing Jiaotong University Chongqing 400074 China State Key Laboratory of Bridge Structural Dynamics China Merchants Chongqing Communications Research and Design Institute Co. Ltd. Chongqing 400067 China Southwest Jiaotong University Chengdu 610031 China

ISBN: (纸本)9780784411391

The steel-anchor beam and steel corbel composite structure is the new type structure in the anchor zone on pylon of cable-stayed bridge. The steel corbel has an important supporting effect on the entire system. In order to investigate the structural behaviors of this type of structure, a full scale model test and 3D FEM analysis were conducted. From the experimental study, it could be found that the bearing load requirements for steel corbel in the structure can be satisfied. The stress is bigger at the welds of the steel corbel, and the stress is less in the far area from the welds. The analysis results show that the stiffened plates can effectively reduce the stress concentration of the steel corbel and the calculating results coincide with the experimental results. Moreover, the capacity of resisting design load and eccentric load is higher. It can be concluded that this new structure is advantageous in mechanical behaviors, and should be more widely studied and applied. © 2010 ASCE.

关键词： Finite element method

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