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Study on Intensity Measures for Velocity Pulse-like Earthquake Ground Motions

Author: ChenKaiLiang
Tutor: ZhouJing
School: Xiangtan University
Course: Structural Engineering
Keywords: Characterization parameters of ground motion intensity Speed ??pulse -type Correlation Validity Deviation Stability
CLC: P315.9
Type: Master's thesis
Year: 2010
Downloads: 18
Quote: 0
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Abstract


About earthquake ground motion intensity characterization parameter (IM) of single scalar to vector characterization from ordinary ground vibration record development to speed pulse-type ground vibration records, analysis objects from single-freedom (SDOF) system development to multi-freedom (MDOF) systems. Foreign strong velocity pulse earthquake ground motion records to carry out the characterization parameters of few domestic little studied. This article is based on the SDOF system and shear MDOF system power process analysis, carried out speed pulse-type earthquake ground motion intensity characterization parameters. The main contents and conclusions are as follows: 1. Study speed pulse-type earthquake ground motion IM with SDOF system of nonlinear deformation demand correlation and analysis of the effectiveness of the IM. 72 speed pulse-type earthquake records based SDOF system power analysis, research, constant ductility level (μ) and under the conditions of constant strength reduction factor (R), the pulse-type ground motion IM maximum nonlinear deformation correlation coefficient changes in law; linear regression and deviation analysis to study the effectiveness of the acceleration response spectrum (Sa (T1)) and peak ground motion velocity (PGV) as a pulse-type ground motion IM. The results show that the pulse-type ground motion IM has a strong dependence on the system cycle pulse type ductility level and strength reduction factor have a great influence and discrete, Sa (T1) and PGV is relatively better ground motion IM. 2. Study speed pulse-type earthquake ground motion IM and shear top MDOF system nonlinear deformation demand correlation and analysis of the effectiveness of the IM. 20 speed pulse-type ground motion records, the MDOF system based nonlinear dynamic time history analysis to study the variation of the correlation coefficient of the largest the nonlinear top floor displacement of the IM and MDOF system under the condition of μ constant speed pulse-type ground motions; by linear regression and away from the poor, the validity of the analysis speed pulse-type earthquake ground motion IM. The results show that: the structure basic cycle and ductility of level and discrete are larger; PGV as IM, correlation coefficient greater deviation is small, and the deviation of the performance of a more stable, better speed pulse-type ground motion IM. The SDOF system 3. Research zooming speed pulse-type ground motion intensity level caused by deviation of the nonlinear displacement reaction. 30 speed pulse-type earthquake records through the SDOF the system power analysis speed pulse-type ground motions were scaled to different target spectral acceleration (Sa), peak acceleration (PGA), peak velocity (PGV), peak displacement ( PGD) level of single degree of freedom by the system of non-linear displacement response bias with the system from vibration cycle and strength reduction factor changes the law; displacement response bias trend determined by log-linear regression of the data scatter, and compare different ground exercise intensity the characterization parameters under displacement deviation stability. The results show that: the displacement deviation of ground motion scaling factor the base order vibration period of the system and the strength of the system has a certain dependence reasonable selection of the scaling factor and characterization of ground motion intensity parameters can effectively reduce the deviation of the estimate structural seismic displacement response.

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CLC: > Astronomy,Earth Sciences > Geophysics > Earth ( rock circles ) physics ( geophysics ) > Seismology > Engineering seismology
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