【摘要】：大連北大友誼橋?yàn)橹骺?33m的簡支地錨式鋼桁架懸索橋,大橋運(yùn)營近30年,出現(xiàn)了橋面下?lián)稀蛩䞍A斜、索鞍偏位、橋面板破損和橋面振動等病害。為保證橋梁運(yùn)營安全,對該橋進(jìn)行了更換橋面系、張拉主纜及更換吊索等方面的維修加固。由于該橋維修加固方案具有較多的風(fēng)險(xiǎn)及不可控因素,為使加固后的結(jié)構(gòu)狀態(tài)滿足設(shè)計(jì)要求,利用MIDAS Civil軟件建立全橋有限元模型,分析結(jié)構(gòu)現(xiàn)狀,通過調(diào)整主纜松弛系數(shù)模擬結(jié)構(gòu)的實(shí)際狀態(tài);對橋面系拆除階段、主纜張拉階段、吊索與索夾更換階段、新橋面系鋪設(shè)階段進(jìn)行施工控制。結(jié)果表明,維修加固后的結(jié)構(gòu)線形與內(nèi)力符合預(yù)期目標(biāo),結(jié)構(gòu)整體受力性能得到提高,達(dá)到了設(shè)計(jì)要求。
[Abstract]:The bridge is a simply-supported ground-anchored steel-frame suspension bridge with the main span of 133m. The bridge operation is nearly 30 years. The bridge deck, the bridge tower, the cable saddle, the bridge deck, the bridge deck vibration and other diseases have appeared. In order to ensure the operation safety of the bridge, the bridge is replaced with the bridge deck system, the tension main cable and the replacement sling. Because the bridge maintenance and strengthening scheme has more risk and non-limiting factors, to meet the design requirements for the reinforced structural state, a full-bridge finite element model is established by using the MIDAS Civil software, and the current state of the structure is analyzed, and the actual state of the structure is simulated by adjusting the relaxation coefficient of the main cable; During the stage of the bridge deck removal, the tension stage of the main cable, the replacement stage of the sling and the cable clamp, the construction control is carried out during the laying stage of the new bridge deck system. The results show that the structural alignment and internal force after the maintenance and reinforcement meet the expected target, and the overall stress performance of the structure is improved and the design requirements are met.
【作者單位】： 大連理工現(xiàn)代工程檢測有限公司;大連理工大學(xué)土木工程學(xué)院;
【分類號】：U445.7
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本文編號：2439849