LRS FRP加固既有人防剪力墙的抗冲击试验研究  

Experimental study on the impact resistance of LRS FRP strengthened shear walls in the existing civil air defense engineering

作　　者：陈文龙 张君博 梁海志 王阳明 张纪刚[1] CHEN Wenlong;ZHANG Junbo;LIANG Haizhi;WANG Yangming;ZHANG Jigang(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Qingdao National Defense Mobilization Office,Qingdao 266071,China;Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]青岛市国防动员办公室,山东青岛266071 [3]广州地铁设计研究院股份有限公司,广州510010

出　　处：《振动与冲击》2024年第18期208-219,共12页Journal of Vibration and Shock

基　　金：国家自然科学基金联合基金(U2106221)。

摘　　要：大应变FRP(large rupture strain FRP)材料较传统FRP具有更大的断裂应变,为探究大应变FRP加固既有人防工程剪力墙的抗冲击性能,分别采用聚对苯二甲酸乙二醇酯FRP(polyethylene terephthalate FRP,PET FRP)和聚萘二甲酸乙二醇酯FRP(polyethylene naphthalene FRP,PEN FRP)加固人防工程剪力墙并开展冲击试验,与未加固的人防工程剪力墙试验与数值结果进行对比分析。结果表明:基于数值模拟所得到的破坏形态与试验现象吻合良好,均为典型的受弯破坏;相较于未加固墙,FRP能大幅提升人防工程剪力墙的极限承载力和抗弯刚度,显著降低跨中挠度;PEN FRP加固较PET FRP加固能提供更好的抗变形能力,进而减轻墙体冲击损伤,但PET FRP较PEN FRP应变范围更广,可提供更好的延性;此外,FRP加固均能显著提升剪力墙的耗能能力,其中PET FRP加固墙的耗能能力要优于PEN FRP加固墙。The shear walls in the existing civil air defense engineering were strengthened by the large rupture strain fiber reinforced polymer(LRS FRP)due to its excellent fracture strain performance.The impact resistance of the strengthened walls was investigated through the impact tests.PET FRP(polyethylene terephthalate FRP)and PEN FRP(polyethylene naphthalate FRP)were adopted,and the experimental results were compared with the experimental and numerical results of the original shear walls.The obtained results indicate that the failure mode acquired by the numerical simulation is in considerable agreement with the test phenomena,which both are the bending failure modes.FRP can significantly improve the ultimate bearing resistance and bending stiffness of the shear walls,and the mid-span’s deflection response can be highly decreased.The PEN FRP reinforcement can provide much better anti-deformation capacity than that of PET FRP,reinforcement,thus reducing the impact damage of the shear walls.However,due to the better ductility of the PET FRP reinforcement,it has a wider application compared with the PEN FRP reinforcement.Furthermore,the energy dissipation capacity of the shear wall can be significantly improved by the FRP reinforcement,specifically,the efficiency of the PET FRP reinforcement is superior to that of PEN FRP reinforcement.

关 键 词：大应变FRP 人防工程 冲击试验 挠度分析 应变分析 能量耗散 

分 类 号：TU354[建筑科学—结构工程]