FRP快速抗屈曲加固轴压钢构件方法的试验研究  

EXPERIMENTAL STUDY ON FRP FAST ANTI-BUCKLING STRENGTHENING TECHNIQUE FOR AXIAL COMPRESSIVE STEEL MEMBERS

作　　者：沙吾列提.拜开依 冯鹏[1] 叶列平[1] 张龑华[1] 

机构地区：[1]清华大学土木工程系,北京100084 [2]新疆大学建筑工程学院,乌鲁木齐830008

出　　处：《工程力学》2012年第6期105-113,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(50978149);长江学者和创新团队发展计划项目(IRT00736);国家重点基础研究发展计划项目(2012CB026200)

摘　　要：该文提出了采用纤维增强复合材料(FRP)快速加固钢构件的概念和方法,通过3个试件的初步试验验证了这种加固方法的有效性,再对14根试件的轴心受压试验,研究了2种长细比、2种约束形式(FRP套管内填砂浆和竹篾包裹外缠FRP)、2种填充物(砂浆和竹篾)以及不同的杆端连接(端部平板承压和单边螺栓连接)对钢构件受压性能和加固效果的影响,通过计算结果与试验结果的对比,分析了加固效果。研究表明:采用该文建议的FRP快速加固轴压钢构件方法,可有效地避免构件出现整体屈曲破坏,改变了试件的最终破坏模式,显著提高构件承载力。试验中加固后承载力最高提高为原钢构件的2.86倍,且趋于延性破坏。以上结果表明,该文建议的加固方法是一种有效的快速加固方法。The technique of FRP （fibre reinforced polymer） fast strengthening steel members is presented in concept and operation. The effectiveness of the technique is proven through the preliminary experiments of three specimens. Then, another 14 specimens have been tested under axial compressive loading, through which the compressive behaviour and strengthening effects are investigated with different configuration parameters, including two slenderness ratios, two confinement configurations （pultruded FRP profile and hand lay-up fibber sheets）, two filled materials （mortar and bamboo splits） and the end connections （confined end-plate connection and single sideband pinned end conditions）. The strengthening effects are analyzed by the comparison of both theoretical and test results, which shows that the overall buckling failure of steel members can be prevented by FRP strengthening, and the ultimate loading capacity and deformation capacity of steel members are enhanced obviously. The highest loading capacity of a strengthening member is 2.86 times of a non-strengthened one. Ductile failure tends to happen for the strengthened member. All these concluded that the technique of FRP fast strengthening steel members is feasible and effective.

关 键 词：FRP纤维增强复合材料 抗屈曲加固 极限承载力:破坏模式 输电钢塔 

分 类 号：TU391[建筑科学—结构工程] TB332[一般工业技术—材料科学与工程]