预张拉CFRP加固简支梁的动力特性分析  

DYNAMIC ANALYSIS OF SIMPLY SUPPORTED BEAMS STRENGTHENED WITH PRETENSION CFRP SHEETS

作　　者：陈峰[1] 周叮[1] 刘朵[2,3] 张建东 

机构地区：[1]南京工业大学土木工程学院,南京211816 [2]河海大学土木与交通学院,南京210098 [3]苏交科集团股份有限公司,南京211112

出　　处：《玻璃钢／复合材料》2017年第5期5-10,10,共6页Fiber Reinforced Plastics/Composites

基　　金：973计划课题(2012CB026205);江苏省属高校自然科学研究重大项目(12KJA580002);江苏省交通厅重大专项(2014Y01)

摘　　要：采用弹性力学方法分析预张拉CFRP加固简支梁的动力特性,研究各参数对加固梁自由振动特性的影响。首先将简支梁和CFRP沿界面分开,基于二维弹性力学理论对梁进行动力学分析,利用弦理论对预张拉CFRP进行动力学分析,通过界面间应力和位移的连续条件得到频率方程,由行列式搜根法数值计算各阶固有频率,数值结果与有限元软件ANSYS进行了比较,显示出了很好的一致性。研究表明,CFRP的加固效果随层数和预拉力增加而增强。Glass fiber reinforced resin composite materials in service is vulnerable to external impacts, which will cause composite structure damage, and thus severly threaten the safety service life of composite. In this paper, the improvement of impact resistance of glass fiber reinforced resin composite materials through coating a layer of polyurea elastomer was investigated. Charpy impact test machine, and optical microscopy were carried out on the specimens of no coating, front coating and back coating, respectively. The results show that the elastic deformation and fracture failure of polyurea coating can dramatically increase impact energy consumption and improve the impact strength of specimens.With the same thickness of coating, the coating of polyurea elastomer of front coating speci- mens does not completely fracture and absorb impact energy mainly through the elastic deformation, playing a buffer role. Conversely, the back coating specimens can absorb more impact energy due to fracture failure of polyurea coating, which will lead to lowest impact damage and higher impact strength.

关 键 词：梁 CFRP 预张拉 加固 固有频率 

分 类 号：TB332[一般工业技术—材料科学与工程]