【摘要】：為了預(yù)測獨塔寬幅斜拉橋長周期地震響應(yīng),以便進(jìn)行更合理的抗震設(shè)計和評估,采用Open SEES軟件建立了某獨塔寬幅斜拉橋的非線性有限元模型,基于傅里葉變換分析了長周期地震動頻譜特性,對比研究了橋梁在遠(yuǎn)場諧和型地震波、近斷層脈沖型地震波、普通地震波以及與設(shè)計反應(yīng)譜匹配的人工地震波作用下的動力響應(yīng),并基于能力/需求法對該橋的抗震性能進(jìn)行了評估。研究表明:長周期地震動對周期為2~4s的獨塔寬幅斜拉橋的地震響應(yīng)具有明顯的放大作用,遠(yuǎn)場諧和型地震波作用下的內(nèi)力響應(yīng)為普通地震波的2倍以上,位移響應(yīng)為普通地震波的18倍以上;主塔塔底截面抗震性能是全橋抗震性能的關(guān)鍵環(huán)節(jié),長周期地震動會使塔底截面產(chǎn)生顯著的塑性變形,導(dǎo)致主塔和主梁產(chǎn)生大位移,并引發(fā)支座破壞;背景工程的橫橋向抗震性能比縱橋向更低,且長周期地震動對橫橋向抗震性能的影響更明顯。
[Abstract]:In order to predict the long-period seismic response of a cable-stayed bridge with single tower and width, a nonlinear finite element model of a cable-stayed bridge with a single tower is established by using Open SEES software in order to carry out more reasonable seismic design and evaluation. Based on Fourier transform, the spectral characteristics of long-period ground motion are analyzed, and the harmonic seismic waves in the far field and the impulsive seismic waves near the fault are compared and studied. The seismic response of the bridge under the action of ordinary seismic waves and artificial seismic waves corresponding to the design response spectrum is evaluated based on the capability / demand method. The results show that the long-period ground motion can amplify the seismic response of the single-tower cable-stayed bridge with a period of 2 ~ 4s, and the internal force response under the action of the far-field harmonic seismic wave is more than 2 times of that of the ordinary seismic wave. The displacement response is more than 18 times of the normal seismic wave. The seismic behavior of the bottom section of the main tower is the key link of the seismic performance of the whole bridge. The long-period ground motion will cause significant plastic deformation of the bottom section of the tower, lead to large displacement of the main tower and main beam, and lead to the failure of the support. The seismic behavior of the transverse bridge is lower than that of the longitudinal bridge, and the effect of long-period ground motion on the seismic performance of the transverse bridge is more obvious than that of the longitudinal bridge.
【作者單位】： 重慶交通大學(xué)土木工程學(xué)院;重慶交通大學(xué)山區(qū)橋梁與隧道工程國家重點實驗室培育基地;
【基金】：重慶市基礎(chǔ)與前沿研究計劃項目(cstc2015jcyj A30014) 國家自然科學(xué)基金資助項目(51408089)
【分類號】：U442.55;U448.27

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