本文選題：斜拉橋　切入點(diǎn)：火致拉索破斷　出處：《公路工程》2017年04期

【摘要】：通過試驗(yàn)確定拉索著火后的溫度場(chǎng)變化,建立了一座斜拉橋模型,采用單根或多根鋼絞線逐漸破斷的方式進(jìn)行結(jié)構(gòu)非線性動(dòng)力分析,研究拉索著火破斷后的結(jié)構(gòu)安全性。引入動(dòng)力放大系數(shù)(DAF)和需求能力比(DCR)分析主梁、主塔以及拉索的動(dòng)力響應(yīng),研究了不同斷索路徑下的橋梁極限承載情況,計(jì)算了相鄰拉索不同著火時(shí)間破斷時(shí)橋梁結(jié)構(gòu)動(dòng)力響應(yīng),得出外索著火破斷比內(nèi)索著火破斷更危險(xiǎn),整根拉索一次破斷的模式不適合模擬斜拉橋拉索著火破斷的情形。
[Abstract]:The temperature field of cable after ignition is determined by experiments, and a model of cable-stayed bridge is established. The nonlinear dynamic analysis of the structure is carried out by means of breaking of one or more steel strands gradually. In this paper, the structural safety of cable after breaking fire is studied. The dynamic response of main beam, main tower and cable is analyzed by introducing dynamic magnification factor (DAF) and demand capacity ratio (DCR), and the ultimate load bearing condition of bridge under different cable broken paths is studied. The dynamic response of bridge structure with different ignition time of adjacent cables is calculated. It is concluded that the fire breakage of external cables is more dangerous than that of internal cables, and the mode of single break of whole cable is not suitable for simulating the situation of cable fire breaking in cable-stayed bridges.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;
【分類號(hào)】：U448.27

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本文編號(hào)：1678707