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Study on the Relationship between Pulse Characteristics of Ground Motion and Structural Damage

Author: BaiWenZuo
Tutor: DaiJunWu
School: China Seismological Bureau, Institute of Engineering Mechanics
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Response spectrum Pulse-dominant ground motion Quasi-static test Earthquake simulation test Hysteretic curve
CLC: P315
Type: Master's thesis
Year: 2005
Downloads: 119
Quote: 1
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Abstract


Based on recent analysis for the destructive near-fault ground motions, this paper gives a quantified definition for the pulse-dominant ground motion. By studying the changing rules of the normalized response spectrum for two types of the pulse combinations, i.e., the major pulse related predecessor and successor pulse combinations, it is found that the contribution of the predecessor and successor pulse combinations together with the major pulse is quite different to structural systems with different natural frequency. Theoretical study shows that different pulse combinations would affect the structural responses with apparent controllable pattern. Through a set of earthquake simulation tests on shaking table for a single story steel structure, above mentioned theoretical results are verified. It provides a good understanding about the damage potential of the major pulse segregated from the full-time-history of pulse-dominant ground motions.According to the comparison analysis for the force-displacement relationship obtained from stets of earthquake simulation tests for 3 RC single story structures and the quasi-static test for one RC single story structure (identical with the former 3 models), as well as the analyses for the natural frequency change of the 3 RC single story structures with the increase of the excitation levels, it is found that the accumulated hysteretic energy-dissipation capacity is critical for the structural safety even after serious damage. It also can be seen from these analyses that the damage pattern is almost completely identical for all 3 structure models regardless they are under excitation of the segregated major pulse only or its’ full time history mother ground motion. Whilst, the damage potential of pulse-dominant ground motion as well as its’ corresponding segregated major pulse is confirmed and verified in designed tests. In addition, test results showed that there is a trend of system strength increasing when the structure subjected to the pulse-dominant ground motions. These tests provide useful reference information for the future quasi-static tests or the nonlinear analysis for RC structures.Test results demonstrated that regardless of the tested structures are in the elastic or inelastic phase, the responses caused by the full-time-history ground motion are all almost completely the same as that of caused by the corresponding segregated major pulse excitation. In some cases, the responses caused by the segregated major pulse are even higher than those of full-time-history ground motions. This phenomenon tells us that, in certain conditions, the segregated major pulse can be used as thesubstitute of the full-time-history pulse-dominant ground motions in evaluation of the damage potential of structures. Obviously, it can be imagine that if this kind of substitute is reasonable, it will save much analysis effort especially in preliminary phase of design practice considering the structural nonlinear behavior, in earthquake simulation test on large shake table or even in large scale pseudo-dynamic test for structures with anticipated natural frequency.

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