本文選題：簡支梁橋　切入點：移動荷載　出處：《振動工程學(xué)報》2014年02期

【摘要】：對簡支梁在移動荷載(單個移動力、等間距移動荷載列及列車荷載)下的振動進行了分析,得到了以橋梁自由振動方式表達的響應(yīng)理論解。通過振動響應(yīng)分析,得出了任一模態(tài)下簡支梁共振及兩類消振效應(yīng)的發(fā)生條件,并闡明了它們的發(fā)生機理。第一類消振只與單個荷載的移動速度有關(guān),第二類消振發(fā)生在兩個荷載之間,并與它們的間距相關(guān)。當(dāng)共振與消振條件同時滿足時,共振將受到抑制,出現(xiàn)共振消失現(xiàn)象。用數(shù)值分析計算了一座19.1m簡支梁橋在高速列車通過時的動力響應(yīng),并從單個輪對所引起的橋梁位移時程出發(fā)進一步說明了共振與消振機理和此時橋梁的響應(yīng)特點,對解析結(jié)果進行了驗證。
[Abstract]:The vibration of simply supported beam under moving load (single moving force, moving load sequence of equal distance and train load) is analyzed, and the theoretical solution of the response expressed in the form of free vibration of bridge is obtained. The occurrence conditions of simply supported beam resonance and two kinds of damping effects in any mode are obtained, and the mechanism of their occurrence is explained. The first type of vibration suppression is only related to the moving speed of a single load, and the second type of vibration suppression occurs between two loads. The resonance will be restrained and the resonance will disappear when the resonance and vibration suppression conditions are satisfied. The dynamic response of a 19.1m simply supported beam bridge is calculated by numerical analysis. The mechanism of resonance and vibration attenuation and the response characteristics of the bridge are further explained from the displacement time history of the bridge caused by single wheelset, and the analytical results are verified.
【作者單位】： 北京交通大學(xué)土木建筑工程學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃973項目(2013CB036203) 中央高�；究蒲袠I(yè)務(wù)費專項資金資助項目(C12JB00250)
【分類號】：U441.3

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本文編號：1700194