近斷層地震動(dòng)作用下鋼筋混凝土橋墩易損性評(píng)價(jià)
[Abstract]:Compared with far field ground motion, near-fault ground motion has obvious velocity pulse band and strong vertical ground motion, which results in serious earthquake damage of bridge structure. In order to reasonably evaluate the seismic vulnerability of typical reinforced concrete pier used in near-fault seismic action, this paper takes the reinforced concrete pier of a common highway in China as the research object, based on the OpenSees seismic analysis software. Considering the uncertainty of material strength, 13 models of reinforced concrete pier are established by Latin hypercube sampling. Random and 13 near-fault seismic records with obvious velocity pulses selected from the PEER seismic database are combined to form a sample of "ground motion and bridge pier". Firstly, the damage parameters such as displacement ductility coefficient, curvature ductility coefficient and displacement angle are determined under the condition of intact, basic intact, slight damage, moderate damage and serious damage. Then eight far-field ground motions are selected to carry out nonlinear time-history analysis of bridge piers, and the pier responses under small, moderate and large earthquakes are calculated, respectively, and compared with the results of near-fault ground earthquake. The results show that the pier damage caused by near-fault earthquake is obviously greater than that of far-field ground motion, and the incremental dynamic analysis of 13 analysis samples under the combined action of horizontal and vertical ground motion is carried out. The peak value of vertical ground motion and the peak value of horizontal ground motion increase according to the equal proportion. The ductility coefficient of pier top displacement, the ductility coefficient of low controlled section curvature of pier and the vulnerable curve of displacement angle are established. It is compared with the vulnerability curve under the action of far-field ground motion. The results show that the reinforced concrete pier used in near-fault seismic action presents a more severe seismic response than that under the action of far-field ground motion. The main contents of this paper are as follows: (1) the damage parameters of the selected model under different damage states are determined, and the horizontal displacement of the pier top is selected in this paper. The curvature and displacement angle of the control section at the bottom of the pier are used to describe the damage parameters of the pier under the action of ground motion, such as intact, basic intact, slight damage, moderate failure and collapse. The values of the above three damage parameters in different failure states are determined by static elastic-plastic nappe analysis and correlation statistical results. (2) the damage parameters of reinforced concrete pier under the action of near-fault earthquake and far field ground motion are compared; According to the characteristics of incremental dynamic analysis method, the peak values of selected near-fault ground motion records and far-field ground motion records are adjusted respectively. The parameter changes of reinforced concrete pier under the seismic fortification standards of small earthquake (0.1g), moderate earthquake (0.2g) and large earthquake (0.4g) are compared and verified. The conclusion of comparative analysis is given. (3) based on the concept of theoretical vulnerability analysis, the vulnerability curve of reinforced concrete pier for near-fault seismic action is established. The vulnerability curves of the above three damage parameters used in near-fault seismic action are given, and the vulnerability of reinforced concrete pier is evaluated. In order to better explain the results, the vulnerability curves under the action of far-field ground motion are also compared and verified.
【學(xué)位授予單位】:石家莊鐵道大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:U442.55;U448.34
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