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运用有限元方法在不同跨度、不同布索方式和不同预应力索数量的工况下,对高温下预应力钢梁进行力学特征分析,得出以上3种因素及火灾时间对钢梁极限荷载的影响规律:跨度越大,极限荷载值越小,极限荷载随着跨度的增加而降低;与直线索预应力钢梁相比,曲线索预应力钢梁的承载能力更大;随着预应力索数量的增加,极限荷载值逐渐增大,增加预应力索数量可以增强预应力钢梁的承载能力;受火时间越长,所能承受的极限荷载值越小,结构越容易破坏,失去承载能力的速度也越快.研究成果可为预应力钢结构抗火设计与应用提供参考.
The finite element method is used to analyze the mechanical characteristics of prestressed steel beams under high temperature under the conditions of different span, different cloths and different prestressed cables. It is concluded that the above three factors and the influence of fire time on the ultimate load of steel beams The influence law: The larger the span, the smaller the limit load value, the lower the ultimate load decreases with the span; Compared with the straight cable prestressed steel beam, the curved cable prestressed steel beam carrying capacity is greater; With the prestressed cable As the number of prestressed steel beams increases, the ultimate load increases gradually. Increasing the number of prestressed cables can increase the carrying capacity of prestressed steel beams. The longer the fire time, the smaller the ultimate load can bear, and the easier the structure is to destroy and lose the carrying capacity The faster the speed.The research results can provide reference for fire-resistant design and application of prestressed steel structure.