本文選題：CFRP + 半橢圓表面裂紋��； 參考：《鋼結(jié)構(gòu)》2017年11期

【摘要】：采用"三維實(shí)體-彈簧-殼"有限元模型對承受拉彎組合荷載的CFRP加固鋼板表面裂紋應(yīng)力強(qiáng)度因子(SIF)進(jìn)行計(jì)算,并研究了拉彎應(yīng)力比、裂紋特征及粘貼層數(shù)等因素對加固效果的影響。研究結(jié)果表明:采用CFRP加固,可顯著降低鋼板半橢圓表面裂紋前緣的應(yīng)力強(qiáng)度因子;最大名義拉應(yīng)力相同的條件時(shí),CFRP的加固效果隨拉彎應(yīng)力比的增大而降低;裂紋特征對加固效果影響較大,對于裂紋面面積較大及形狀扁平的裂紋CFRP會取得更好的加固效果;增加CFRP層數(shù)能在一定程度上提升加固效果,但加固效果與其粘貼層數(shù)并不成正比,需考慮膠層傳遞荷載能力以免造成材料的浪費(fèi)。
[Abstract]:The finite element model of "three-dimensional solid spring shell" is used to calculate the stress intensity factor (sif) of surface crack of CFRP strengthened steel plate under combined tension and bending loads, and the ratio of tension and bending stress is studied. The effect of crack characteristics and the number of bonding layers on the reinforcement effect. The results show that CFRP can significantly reduce the stress intensity factor of the front edge of semi-elliptical surface crack of steel plate, and the reinforcement effect of CFRP decreases with the increase of tensile stress ratio when the maximum nominal tensile stress is the same. Crack characteristics have a great influence on the reinforcement effect, and better results can be obtained for cracked CFRP with large crack surface area and flat shape, and increasing the number of CFRP layers can enhance the reinforcement effect to a certain extent. However, the reinforcement effect is not directly proportional to the number of adhesive layers, so the transfer capacity of rubber layer should be considered to avoid the waste of materials.
【作者單位】： 中冶建筑研究總院有限公司國家鋼結(jié)構(gòu)工程技術(shù)研究中心;北京交通大學(xué)土木建筑工程學(xué)院;
【基金】：“十三五”國家重點(diǎn)研發(fā)計(jì)劃(2016YFC0701303) 國家自然科學(xué)基金(51578559)
【分類號】：TU391

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