CAJ | 학술논문

针对方钢管混凝土柱加固后的抗震性能进行了6根柱的低周反复荷载破坏试验，研究了外套钢套法和外包钢套法两种加固方法以及钢套壁厚、施焊和加固高度对加固效果的影响，分析了相应的加固机理。通过对试件的滞回曲线、骨架曲线、延性、耗能能力、承载力及刚度退化系数等参数的分析可知：钢套法合理加固保证了混凝土柱“强剪弱弯”抗震延性设计目标，其破坏形态均表现为压弯破坏；外套钢套法加固提高柱的承载力作用有限，但极大提高了混凝土柱的延性性能，使其抗震性能明显提高；外包钢套法加固显著提高了混凝土柱的承载力、刚度，使其延性性能有所改善，抗震性能显著提高。
침대방강관혼응토주가고후적항진성능진행료6근주적저주반복하재파배시험，연구료외투강투법화외포강투법량충가고방법이급강투벽후、시한화가고고도대가고효과적영향，분석료상응적가고궤리。통과대시건적체회곡선、골가곡선、연성、모능능력、승재력급강도퇴화계수등삼수적분석가지：강투법합리가고보증료혼응토주“강전약만”항진연성설계목표，기파배형태균표현위압만파배；외투강투법가고제고주적승재력작용유한，단겁대제고료혼응토주적연성성능，사기항진성능명현제고；외포강투법가고현저제고료혼응토주적승재력、강도，사기연성성능유소개선，항진성능현저제고。
In order to study the seismic behavior of concrete-filled square steel tubular ( CFSST ) column after reinforcement, a destruction test was carried out on six specimens under lateral cyclic loading. The influences of steel jacket and enveloped steel methods, wall thickness of the enveloped steel and welding and strengthening height on the reinforcement effect were studied, and their rein-forcement mechanism was analyzed. From the test data, the hysteretic loops, skeleton curves, duc-tility, dissipative ability, ultimate strength and stiffness degradation etc. , a conclusion was drawn:the CFSST column strengthened by the steel sleeve method meets the strong shear weak bending re-quirements in seismic design, and the failure modes of all columns are compression bending failure. The steel jacket method has notable influence on the ductility and the seismic performance of col-umns, but leads to limited increment to the ultimate strength. The enveloped steel method has sig-nificant improvements on the strength, the stiffness and all aspects of seismic performance of col-umns.