本文選題：鐵路橋 + 正交異性鋼橋面板��； 參考：《橋梁建設(shè)》2017年03期

【摘要】：為研究U肋內(nèi)隔板及其參數(shù)對(duì)正交異性鋼橋面板疲勞性能的影響,以某鋼桁梁柔性拱鐵路橋?yàn)楸尘?針對(duì)其鋼橋面板制作2個(gè)足尺模型(試件1無(wú)內(nèi)隔板,試件2設(shè)置內(nèi)隔板)進(jìn)行疲勞試驗(yàn),研究疲勞裂紋的產(chǎn)生情況,采用ANSYS軟件建立有限元模型,分析產(chǎn)生裂紋處縱肋腹板的應(yīng)力分布情況,應(yīng)用斷裂力學(xué)方法評(píng)估鋼橋面板的疲勞壽命,并分析內(nèi)隔板參數(shù)對(duì)鋼橋面板應(yīng)力的影響。結(jié)果表明:縱肋腹板與橫梁帽孔交匯處易發(fā)生疲勞裂紋,2個(gè)試件均在此處出現(xiàn)疲勞裂紋;設(shè)置縱肋內(nèi)隔板能改善縱肋腹板與橫梁帽孔交匯處的應(yīng)力集中現(xiàn)象,有效提高縱肋腹板和橫梁帽孔處的疲勞強(qiáng)度;內(nèi)隔板厚度對(duì)鋼橋面板的應(yīng)力影響不大,適當(dāng)增加內(nèi)隔板高度差可減小縱肋腹板處主應(yīng)力。
[Abstract]:In order to study the influence of U-rib inner partition and its parameters on fatigue performance of orthotropic steel bridge panel, two full-scale models (specimen 1 without inner partition) were made for the steel deck slab of a steel truss flexible arch railway bridge. Specimen 2) fatigue test was carried out to study the occurrence of fatigue cracks. The finite element model was established by ANSYS software, and the stress distribution of longitudinal rib web was analyzed. The fatigue life of steel bridge slab was evaluated by fracture mechanics method, and the influence of internal partition parameters on the stress of steel bridge slab was analyzed. The results show that fatigue cracks occur easily at the intersection of longitudinal rib web and cap hole of beam, and fatigue cracks occur in the two specimens, and the stress concentration phenomenon at the junction of longitudinal rib web and cap hole of beam can be improved by setting longitudinal rib internal partition. The fatigue strength of the longitudinal rib web and the cap hole of the beam is improved effectively, the thickness of the inner partition has little effect on the stress of the steel bridge panel, and the main stress at the longitudinal rib web can be reduced by increasing the height difference of the internal partition.
【作者單位】： 同濟(jì)大學(xué)土木工程學(xué)院;長(zhǎng)春市規(guī)劃局;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51578407) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)項(xiàng)目(2013CB036303)~~
【分類(lèi)號(hào)】：U441.4
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本文編號(hào)：1946443