火灾后预应力双T板的加固设计

针对遭遇火灾损伤的预应力双T板,运用有限元软件Abaqus进行顺序热-力耦合分析,得到预应力双T板的温度场云图、载荷-位移曲线,以及构件破坏时钢绞线和混凝土的应力云图.对混凝土双T板构件受损程度进行判定,确认其具有加固价值.基于该双T板的受弯承载力、挠度和破坏性质分析,提出体外预应力钢绞线结合增大受压区截面的加固方案,...

Reinforcement design of pre stressed double T slab after fire

As to the pre stressed double T slab damaged by fire, the sequential thermo mechanical coupling analysis is carried out by finite element software Abaqus, and the temperature field contour, the load displacement curve, and the stress contour of steel strand and concrete in case of component failure are obtained. The damage of the concrete double T slab is determined, which shows that the double T slab is valuable to be reinforced. Based on the analysis of the bending capacity, deflection and failure properties of the double T slab, the reinforcement scheme of external pre stressed steel strand combined with section increasing at compression zone is proposed. The corresponding checking on the optimization scheme shows that the reinforcement scheme can meet the requirements. This method can provide reference for the reinforcement of pre stressed double T slab after high temperature.