【摘要】：為深入研究液化場地梁的約束對橋臺震害模式的影響,首先在對唐山地震中勝利橋震害調查的基礎上,采用有限元軟件UWLC對該橋震害進行數值模擬分析,并將數值模擬結果與實際震害結果進行對比驗證。研究結果表明:數值模擬結果與實際震害結果基本一致,說明采用UWLC軟件進行震害數值模擬分析是可行的。然后對有、無樁基條件下梁的約束力和液化層厚度對橋臺震害模式的影響分別進行數值模擬分析。研究結果表明:在地震作用下,橋梁發(fā)生落梁破壞后會導致橋臺的滑移破壞更為嚴重。與無樁基的重力式橋臺不同,樁基橋臺的震害模式均表現為前傾式破壞,這主要是因為樁基礎限制了橋臺底部的水平移動。梁的約束力對樁基橋臺震后殘余位移的影響程度要明顯小于無樁基橋臺。對于重力式橋臺,液化砂層對地震波的中高頻段有一定濾波作用,反映出液化層的減震作用;而對于樁基橋臺,由于樁-土-臺身的相互作用,液化砂層的減震效果不明顯。
[Abstract]:In order to deeply study the influence of the constraints of liquefied site beams on the seismic damage model of the bridge, firstly, based on the investigation of the earthquake damage of Shengli Bridge in Tangshan earthquake, the finite element software UWLC is used to simulate and analyze the seismic damage of the bridge. The numerical simulation results are compared with the actual earthquake damage results. The results show that the numerical simulation results are basically consistent with the actual earthquake damage results, which indicates that it is feasible to use UWLC software to carry out the numerical simulation analysis of earthquake damage. Then the effects of the binding force of the beam and the thickness of the liquefied layer on the seismic damage mode of the bridge deck are simulated and analyzed respectively under the condition of no pile foundation. The results show that under the action of earthquake, the sliding failure of the bridge platform will be more serious after the falling beam failure of the bridge occurs. Different from the gravity bridge without pile foundation, the earthquake damage mode of pile foundation bridge is forward tilting failure, which is mainly because the pile foundation limits the horizontal movement of the bottom of the bridge platform. The influence of the binding force of the beam on the residual displacement of the pile foundation bridge after earthquake is obviously smaller than that of the bridge without pile foundation. For gravity bridge, liquefied sand layer has a certain filtering effect on the middle and high frequency band of seismic wave, reflecting the damping effect of liquefied layer, while for pile foundation bridge, due to the interaction of pile, soil and platform, the damping effect of liquefied sand layer is not obvious.
【作者單位】： 大連交通大學土木與安全工程學院;沈陽市市政工程設計研究院;
【基金】：國家自然科學基金項目(51208073) 遼寧省“百千萬人才工程”人選項目擇優(yōu)資助(2014921061) 遼寧省高等學校優(yōu)秀人才支持計劃資助(LJQ2014049) 大連市高層次人才創(chuàng)新支持計劃項目(2015R073)
【分類號】：U442.55
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本文編號：2477839