The parameters in the study included the fire duration time , the axial load level , the section type and the strengthen method . the ultimate lateral strength , flexural stiffness , dissipated energy and ductility of the columns were compared and analyzed . ( 2 ) based on the stress - strain relations for steel and concrete after high temperature and the temperature field in the structural member , fiber - based model was developed to calculate the hysteretic moment ( m ) versus curvature ( ) relations and the lateral load ( p ) versus lateral displacement ( ? ) ( 2 )在確定高溫后鋼材和混凝土在往復(fù)荷載作用下的應(yīng)力-應(yīng)變關(guān)系以及構(gòu)件截面溫度場的基礎(chǔ)上,考慮力-溫度-時(shí)間作用路徑,建立了火災(zāi)后鋼管混凝土壓彎構(gòu)件滯回性能的理論分析模型,對火災(zāi)后鋼管混凝土構(gòu)件的彎矩-曲率( m - ) 、荷載-變形( p - )滯回關(guān)系曲線進(jìn)行了分析,計(jì)算結(jié)果與實(shí)驗(yàn)結(jié)果總體上吻合較好。