發(fā)布時(shí)間：2018-02-27 17:44

  本文關(guān)鍵詞： 橋梁工程 固有振動(dòng) 試驗(yàn) 有限元法 多索-梁結(jié)構(gòu) 斜拉索 簡(jiǎn)化公式　出處：《工程力學(xué)》2017年01期 　論文類型：期刊論文

【摘要】：進(jìn)行了單索-梁結(jié)構(gòu)和二索-梁結(jié)構(gòu)模型固有振動(dòng)試驗(yàn),采用斜拉橋整體動(dòng)力分析有限元方法建立了索梁結(jié)構(gòu)有限元模型,與試驗(yàn)結(jié)果進(jìn)行的比較驗(yàn)證了所建有限元模型的正確性。通過對(duì)單索-梁結(jié)構(gòu)至四索-梁結(jié)構(gòu)的固有振動(dòng)特性的有限元分析表明,斜拉索的存在和數(shù)量對(duì)索梁結(jié)構(gòu)的面內(nèi)固有頻率影響較大,對(duì)面外固有頻率影響很小;斜拉索的增加使索梁結(jié)構(gòu)面內(nèi)振動(dòng)頻率增大的主要原因是斜拉索對(duì)主梁起到豎向支承的作用。將斜拉索豎向支承作用簡(jiǎn)化為彈性支撐,考慮斜拉索水平分力對(duì)主梁軸力的影響,推導(dǎo)得到了多索-梁結(jié)構(gòu)面內(nèi)固有振動(dòng)的頻率方程和振型函數(shù),與有限元計(jì)算結(jié)果進(jìn)行的對(duì)比說明了所得簡(jiǎn)化公式的正確性和適用性。
[Abstract]:The natural vibration tests of single cable-beam structure and two-cable-beam structure are carried out, and the finite element model of cable-beam structure is established by using the finite element method of overall dynamic analysis of cable-stayed bridge. The comparison with the experimental results verifies the correctness of the proposed finite element model. The finite element analysis of the natural vibration characteristics of the single cable beam structure to the four cable beam structure shows that, The existence and quantity of cable have great influence on the in-plane natural frequency of cable-beam structure, but have little effect on the external natural frequency of cable-beam structure. The main reason for the increase of in-plane vibration frequency of cable-beam structure is that the cable-stayed cable plays a vertical supporting role on the main beam. The vertical support of the cable-stayed cable is simplified as elastic support, and the influence of the horizontal component force of the stay cable on the axial force of the main beam is considered. The frequency equation and mode function of in-plane natural vibration of multi-cable beam structure are derived and compared with the results of finite element calculation. The correctness and applicability of the simplified formula are illustrated.
【作者單位】： 福州大學(xué)土木工程學(xué)院;福州大學(xué)至誠學(xué)院;
【基金】：教育部“新世紀(jì)優(yōu)秀人才支持計(jì)劃”項(xiàng)目(NCET-13-0737)
【分類號(hào)】：U441.3

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