拉弯组合荷载下CFRP加固钢板表面裂纹应力强度因子分析

发布时间：2018-06-08 02:22

本文选题：CFRP + 半椭圆表面裂纹　；参考：《钢结构》2017年11期

【摘要】：采用"三维实体-弹簧-壳"有限元模型对承受拉弯组合荷载的CFRP加固钢板表面裂纹应力强度因子(SIF)进行计算,并研究了拉弯应力比、裂纹特征及粘贴层数等因素对加固效果的影响。研究结果表明:采用CFRP加固,可显著降低钢板半椭圆表面裂纹前缘的应力强度因子;最大名义拉应力相同的条件时,CFRP的加固效果随拉弯应力比的增大而降低;裂纹特征对加固效果影响较大,对于裂纹面面积较大及形状扁平的裂纹CFRP会取得更好的加固效果;增加CFRP层数能在一定程度上提升加固效果,但加固效果与其粘贴层数并不成正比,需考虑胶层传递荷载能力以免造成材料的浪费。
[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.
【作者单位】：中冶建筑研究总院有限公司国家钢结构工程技术研究中心;北京交通大学土木建筑工程学院;
【基金】：“十三五”国家重点研发计划(2016YFC0701303) 国家自然科学基金(51578559)
【分类号】：TU391

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