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(中鐵第一勘察設(shè)計(jì)院集團(tuán)有限公司, 西安 710043)
摘要: 為了研究大跨鋼?混凝土組合梁斜拉橋在施工過程中主梁與主塔的內(nèi)力及位移變化規(guī)律,以江西藥都大橋?yàn)槔?,采?ANSYS 軟件建立三維精細(xì)化有限元模型,對此鋼?混凝土組合梁斜拉橋進(jìn)行了施工過程數(shù)值分析。 計(jì)算結(jié)果表明:在主橋最大單懸臂狀態(tài)、合龍和橋面鋪裝后,主梁與主塔的應(yīng)力、變形均滿足相關(guān)規(guī)范要求。 考慮斜拉索自重影響,通過 Ernst 公式對斜拉索的彈性模量進(jìn)行修正,分析了幾何非線性對結(jié)構(gòu)內(nèi)力和變形的影響。 分析結(jié)果表明:隨著斜拉索長度的不斷變長,垂度效應(yīng)越來越明顯,尤其跨中斜拉索之間的主梁彎矩受到的影響較大,施工到橋合龍階段,相對考慮垂度效應(yīng),不考慮垂度效應(yīng)時(shí),塔根部主梁彎矩減小 1?? 6%;結(jié)構(gòu)大位移及 P?δ 效應(yīng)對主梁跨中撓度影響不超過 4%。
關(guān)鍵詞: 大跨鋼?混凝土組合梁斜拉橋; 施工過程; 懸臂拼裝; 垂度效應(yīng); 大位移效應(yīng); 荷載?位移效應(yīng)
中圖分類號:TU398,U443 文獻(xiàn)標(biāo)志碼:A 文章編號:1002?848X(2022)12?0121?06
[引用本文] 田引安. 大跨鋼?混凝土組合梁斜拉橋施工階段受力性能分析[ J]. 建筑結(jié)構(gòu),2022,52(12):121?126.TIAN Yin′ an. Mechanical performance analysis of long?span steel?concrete composite beam cable?stayed bridge duringconstruction[J]. Building Structure,2022,52(12):121?126.
DOI:10?? 19701 / j.jzjg.YG220639
Mechanical performance analysis of long?span steel?concrete composite beam cable?stayedbridge during construction
TIAN Yin′an
(China Railway First Survey and Design Institute Group Co., Ltd., Xi′an 710043, China)
Abstract: In order to study the internal force and displacement variation law of main girder and main tower of long?span steel?concrete composite beam cable?stayed bridge during construction, taking Jiangxi Yaodu Bridge as an example, the three?dimensional refined finite element model was established by ANSYS software, and the construction process of the steel?concrete composite beam cable?stayed bridge was numerically analyzed. The calculation results show that after the maximum single cantilever state, closure and deck pavement of the main bridge, the stress and deformation of the main beam and the main tower meet the requirements of the relevant specifications. Considering the influence of self?weight of stay cable, the elastic modulus of stay cable was corrected by Ernst formula, and the influence of geometric nonlinearity on internal force and deformation of structure was analyzed. The analysis results show that the sag effect becomes more and more obvious with the continuous increase of the length of the stay cable, especially the bending moment of the main beam between the mid?span stay cables is greatly affected. When the construction reaches the closure stage of the bridge, the bending moment of the main beam at the root of the tower decreases by 1?? 6% compared with that considering the sag effect and without considering the sag effect. The influence of structural large displacement and P?δ effect on the mid?spandeflection of the main beam is not more than 4%.
Keywords:steel?concrete composite beam cable?stayed bridge; construction process; cantilever erection; sag effect; largedisplacement effect; load?displacement effect
∗山區(qū)淺灘跨江大跨度懸索橋關(guān)鍵技術(shù)研究(TFSH?HJ.B?KY?1903?039)。第一作者:田引安,學(xué)士,高級工程師,主要從事道路總體設(shè)計(jì)、路線及互通設(shè)計(jì)、道橋工程方向的研究,Email:88404303@qq.com。
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