本文選題：斜拉橋　切入點(diǎn)：公路鐵路兩用橋　出處：《橋梁建設(shè)》2014年05期 　論文類型：期刊論文

【摘要】：為研究非線性因素對超大跨度公鐵兩用斜拉橋主要構(gòu)件變形和受力的影響程度,采用5種分析狀態(tài),對一座跨度超過千米的公鐵兩用鋼桁梁斜拉橋進(jìn)行成橋狀態(tài)下的活載非線性計(jì)算分析。建立全橋平面桿系模型,計(jì)算各控制量在最不利活載作用下的極值及非線性影響系數(shù)。結(jié)果表明:對超大跨度公鐵兩用斜拉橋而言,斜拉索的垂度效應(yīng)仍然是幾何非線性影響的主要因素,梁-柱效應(yīng)和大位移效應(yīng)相對較弱;目前橋梁設(shè)計(jì)的通常方法是考慮修正斜拉索彈性模量進(jìn)行線性計(jì)算,并在此基礎(chǔ)上活載考慮10%的非線性放大系數(shù),該方法現(xiàn)實(shí)、合理而且稍偏安全。
[Abstract]:In order to study the influence of nonlinear factors on the deformation and stress of the main components of large-span cable-stayed bridge, five kinds of analytical states are adopted. In this paper, a steel truss girder cable-stayed bridge with a span of more than one kilometer is calculated and analyzed under the condition of completion of the bridge, and the plane bar system model of the whole bridge is established. The maximum value and nonlinear influence coefficient of each control quantity under the most unfavorable live load are calculated. The results show that the sag effect of the stay cable is still the main factor of geometric nonlinearity for the large-span double-purpose railway cable-stayed bridge. The beam-column effect and the large displacement effect are relatively weak. At present, the usual method for bridge design is to calculate the elastic modulus of the cable with a modified linear method, and on the basis of this, the nonlinear magnification factor of 10% is considered under live load. Reasonable and slightly safe.
【作者單位】： 中鐵大橋勘測設(shè)計(jì)院集團(tuán)有限公司;
【分類號】：U448.27

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本文編號：1613573