發(fā)布時間：2018-07-12 18:48

  本文選題：簡支梁 + 鋼-混組合梁�。� 參考：《橋梁建設》2017年03期

【摘要】：為研究鋼-混組合箱梁受火時的撓度變化、破壞模式和耐火時間,以某鋼-混組合簡支箱梁為背景,采用ANSYS軟件建立有限元模型,計算不同受火工況和火災場景下梁跨中截面的溫度場,分析梁的撓變規(guī)律和破壞模式,研究其耐火極限。結果表明:鋼箱底板受火時,梁的跨中撓度呈線性增加趨勢;腹板受火時,撓度很快進入大幅增長階段;鋼箱底板受火時,梁隨受火時間逐漸下?lián)隙茐?腹板受火時,梁發(fā)生翹曲,受火側腹板屈曲,兩側和一側腹板受火時,梁分別發(fā)生對稱變形和單側翹曲;同一火災場景下,腹板受火時梁的耐火時間比鋼箱底板受火時大幅減小;受火位置相同時,HC火災下梁的耐火時間比ISO834火災下的耐火時間明顯縮短;在設定的延火時間內,External和Design火災下梁未破壞。
[Abstract]:In order to study the deflection, failure mode and fireproof time of steel-mixed composite box girder under fire, the finite element model was established by ANSYS software. The temperature field of the middle cross section of the beam under different fire conditions and fire scenes is calculated, the deflection law and failure mode of the beam are analyzed, and the fire resistance limit is studied. The results show that the mid-span deflection of the beam increases linearly when the bottom plate of the box is under fire; when the web plate is under fire, the deflection rapidly enters the stage of large increase; when the bottom plate of the box is under fire, the beam is destroyed with the time of the fire, and when the web is under fire, the beam is destroyed with the time of the fire, and when the web is under fire, When the two sides and one side of the web are burned, the symmetrical deformation and one side warpage occur respectively, and the fire resistance time of the web fire is much smaller than that of the bottom plate of the steel box in the same fire scene, and when the two sides and one side of the web are subjected to fire, the beam has symmetrical deformation and one side warping, respectively. The fire resistance time of beam under HC fire is shorter than that under ISO 834 fire when the fire position is the same, and the beam is not destroyed in the fire of external and Design fires.
【作者單位】： 長安大學公路學院;浙江工業(yè)大學建筑工程學院;浙江工業(yè)大學工程設計集團有限公司市政工程設計研究院;
【基金】：國家自然科學基金項目(51308056) 中央高校基本科研業(yè)務專項資金項目(310821172003) 國家留學基金資助項目(201406565013)~~
【分類號】：U441
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本文編號：2118142