發(fā)布時(shí)間：2019-06-11 01:05

【摘要】：為研究斜拉橋上鋪設(shè)的大型輸水管道發(fā)生水錘效應(yīng)時(shí)橋梁結(jié)構(gòu)的動力響應(yīng),以某獨(dú)塔斜拉橋?yàn)楣こ瘫尘?根據(jù)水錘效應(yīng)的基本理論和作用方式,將管道對橋梁的動力效應(yīng)簡化為一隨時(shí)間變化的動力荷載。通過分別建立管道水錘計(jì)算模型和橋梁動力計(jì)算模型,得到水錘效應(yīng)發(fā)生時(shí)閥門位置順橋向沖擊力隨時(shí)間的變化情況,再將此沖擊力作為動力荷載施加到橋梁模型上。計(jì)算結(jié)果表明:水錘沖擊力隨時(shí)間呈周期性變化,閥門短時(shí)間關(guān)閉時(shí)將產(chǎn)生較大的沖擊荷載;漂浮體系獨(dú)塔斜拉橋各構(gòu)件在水錘沖擊作用下的動力響應(yīng)以順橋向方向?yàn)橹?同時(shí)伴隨有豎向的位移與應(yīng)力。主梁上的應(yīng)力變化可忽略不計(jì),橋塔及斜拉索中應(yīng)力變化分別可達(dá)0.7MPa和1.5MPa左右。單側(cè)布置的管道還會產(chǎn)生偏心作用,使結(jié)構(gòu)的動力響應(yīng)呈現(xiàn)非對稱性。
[Abstract]:In order to study the dynamic response of the bridge structure when the large water transmission pipeline laid on the cable-stayed bridge has the water hammer effect, taking a single tower cable-stayed bridge as the engineering background, according to the basic theory and action mode of the water hammer effect, The dynamic effect of pipeline on bridge is simplified to a dynamic load changing with time. By establishing the pipeline water hammer calculation model and the bridge dynamic calculation model respectively, the change of the valve position along the bridge with time is obtained when the water hammer effect occurs, and then the impact force is applied to the bridge model as the dynamic load. The calculation results show that the impact force of the water hammer varies periodically with time, and the valve will produce a large impact load when the valve is closed for a short time. The dynamic response of each component of floating system single tower cable-stayed bridge under the impact of water hammer is mainly along the bridge, accompanied by vertical displacement and stress. The stress variation on the main beam can be ignored, and the stress variation in the bridge tower and cable-stayed cable can reach about 0.7MPa and 1.5MPa, respectively. The unilateral pipeline also produces eccentricity, which makes the dynamic response of the structure asymmetrical.
【作者單位】： 同濟(jì)大學(xué);
【分類號】：U448.27

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