本文選題：鋼桁梁 + 懸索橋��； 參考：《湖南大學(xué)學(xué)報(bào)(自然科學(xué)版)》2017年03期

【摘要】：魚(yú)骨單主梁模型是分析大跨度鋼桁梁懸索橋抗風(fēng)性能的常用簡(jiǎn)化模型.針對(duì)由于懸索橋鋼桁梁斷面桿件眾多造成的其扭轉(zhuǎn)質(zhì)量慣性矩計(jì)算繁瑣、精度低的問(wèn)題,提出一種基于均勻附加扭轉(zhuǎn)質(zhì)量慣性矩前后結(jié)構(gòu)扭轉(zhuǎn)頻率的變化計(jì)算鋼桁梁扭轉(zhuǎn)質(zhì)量慣性矩的方法,并給出了該方法的理論說(shuō)明、適用條件等.以一鋼桁梁懸臂結(jié)構(gòu)為例進(jìn)行了數(shù)值仿真,結(jié)果表明:附加扭轉(zhuǎn)質(zhì)量慣性矩施加在全截面或上、下弦桿節(jié)點(diǎn),且鋼桁梁的長(zhǎng)細(xì)比L/D≥20時(shí),該方法計(jì)算的扭轉(zhuǎn)質(zhì)量慣性矩有較高的精度.采用該方法計(jì)算了多座鋼桁梁懸索橋的主梁扭轉(zhuǎn)質(zhì)量慣性矩,比較了全桁架模型和單主梁模型扭轉(zhuǎn)振動(dòng)頻率,驗(yàn)證了方法的有效性.
[Abstract]:The fishbone single beam model is a common simplified model for analyzing the wind resistance of long span steel truss suspension bridges. The calculation of torsional mass moment of inertia is tedious and the precision is low due to the numerous members of steel truss beam section of suspension bridge. A method of calculating torsional mass inertia moment of steel truss beam based on the variation of torsional frequency before and after uniform additional moment of inertia of torsional mass is presented. The theoretical explanation and applicable conditions of this method are given. Taking a steel truss cantilever structure as an example, the numerical simulation results show that the additional torsional mass moment of inertia is applied on the full section or upper section and lower chord joints, and the aspect ratio of the steel truss is L / D 鈮，

本文編號(hào)：1807627