軟土及近場主余震地震動作用下RC框架結(jié)構(gòu)反應(yīng)特征研究
[Abstract]:Historic seismic data show that about 89% of strong earthquakes will occur in a short period of time after strong aftershocks. Aftershocks and main earthquake ground motions constitute the main aftershocks. After the main shock action, strong aftershocks often cause additional damage to the structure, further deepen the damage, make the structure and components tend to be unsafe, and then cause seismic damage. The potential damage potential of soft ground motions to structures is different from that of hard ground motions. The damage of near-field impulsive ground motions to structures is often greater than that of non-impulsive ground motions because they contain impulsive signals. The main contents and conclusions are as follows: (1) The accuracy of Van Nuys Building's Open Sees finite element model is validated by comparing the numerical simulation results with the measured data of sensors. The response characteristics of the frame structure under the action of the main aftershock sequence in soft soil (the peak displacement, the maximum interlayer displacement angle and the maximum residual interlayer displacement angle) are analyzed and compared. The results show that the additional damage of the structure caused by the aftershock in soft soil is much greater than that caused by the general aftershock. When the earthquake intensity is large, the response of the soft soil structure is more intense. The difference of earthquake intensity input order will lead to different degrees of structural damage. The energy dissipation of the members under the inverse sequence of the main aftershock sequence is generally greater than that under the positive sequence of the earthquake. (3) The main aftershock near the field of the frame structure is studied. The response characteristics under the action of the sequence are studied. The near-field main and aftershock sequences are constructed by random combination, and the influence of near-field ground motion polarity (realized by rotating ground motion) on the structure is studied. It is more severe. The occurrence of aftershocks and the increase of intensity will change the corresponding angle of the structure when the maximum response occurs. And the results are different when the structural response is measured by different response indices. (4) The vulnerability of the frame structure under soft soil and near-field main aftershocks is studied, and the vulnerability corresponding to the general site and far-field ground motions is also studied. The results show that soft soil aftershocks and near-field aftershocks can significantly increase the damage transcendence probability of structures, while the vulnerability curves of structures under the main and far-field aftershocks have little difference before and after the main aftershocks.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU375.4
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