【摘要】：為合理模擬地震時相鄰橋梁間發(fā)生的碰撞響應(yīng),提出適用于橋梁多維碰撞響應(yīng)分析的三維Kelvin接觸-摩擦撞擊模型,即將Kelvin-Voigt模型和庫倫摩擦模型相結(jié)合,通過一個摩擦元件來模擬發(fā)生縱向碰撞后,接觸點間的橫向和豎向的相對摩擦作用,以真實地模擬結(jié)構(gòu)接觸位置的三維撞擊行為。進而將該三維撞擊模型引入所建立的結(jié)構(gòu)精細化模擬分析平臺FENAP中,與纖維梁柱單元模型良好結(jié)合,實現(xiàn)對橋梁的多維碰撞響應(yīng)分析。通過對一鋼筋混凝土連續(xù)梁橋在雙向地震作用下的碰撞響應(yīng)分析,結(jié)果表明:所提出的三維撞擊模型能夠模擬鄰梁間的縱向和橫向碰撞響應(yīng);縱向碰撞對剛度較大的橋梁影響較大,會增大墩底剪力和墩頂位移,加劇橋墩的塑性發(fā)展;橫向碰撞對橋梁的碰撞響應(yīng)影響較大,不可忽略。
[Abstract]:In order to reasonably simulate the collision response between adjacent bridges during earthquake, a three-dimensional Kelvin contact friction model suitable for bridge multidimensional impact response analysis is proposed, which combines Kelvin-Voigt model with Coulomb friction model. A friction element is used to simulate the transverse and vertical relative friction between the contact points after longitudinal collision, so as to simulate the three-dimensional impact behavior of the contact position of the structure. Furthermore, the 3D impact model is introduced into the structural fine simulation and analysis platform FENAP, which is well combined with the fiber Liang Zhu element model to realize the multi-dimensional impact response analysis of the bridge. Through the analysis of the impact response of a reinforced concrete continuous beam bridge under the action of bidirectional earthquake, the results show that the 3D impact model can simulate the longitudinal and transverse impact responses of adjacent beams. Longitudinal impact on the stiffness of the larger bridge will increase the pier bottom shear force and pier top displacement, increase the plastic development of the pier, transverse impact on the bridge impact response, can not be ignored.
【作者單位】： 天津大學(xué)濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室;鐵道第三勘察設(shè)計院集團有限公司;
【基金】：國家重點基礎(chǔ)研究發(fā)展“973”計劃項目(2011CB013603) 國家自然科學(xué)基金(91315301)
【分類號】：U442.55
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本文編號：2171082