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给出了火灾下预应力混凝土多肋T型梁桥的火灾模型和有限元建模计算方法,分析了火灾下预应力混凝土多肋T型梁桥延火变形,揭示了其桥面平整度的变化规律。结果表明,整个延火过程中,受火梁体均由反拱状态逐渐下挠,对称边肋受火,桥面呈倒“U”型,对称中肋受火,桥面呈“V”型,4片梁肋均匀受火,桥面变形基本同步;所有梁肋受火,桥面平整度不受影响;中肋受火,桥面平整度随延火时间直线变化;余肋受火,桥面平整度大多呈曲线变化。
The fire model and finite element modeling method of prestressed concrete multi-ribbed T-beam bridge under fire are given. The deformation of prestressed concrete multi-ribbed T-beam bridge under fire is analyzed, and the flatness of the bridge deck is revealed The law of change. The results show that during the whole process of fire extension, the body of the fire beam is gradually deflected by the reverse arch, the symmetrical rib is exposed to fire, the deck is inverted “U”, the symmetrical rib is exposed to fire, the deck is “V ”Type, four beams evenly by the fire, deck deformation is basically synchronized; all beams by the fire, the bridge flatness is not affected; in the rib by the fire, the bridge flatness changes with the straight line time delay; Fire, bridge deck mostly curve changes.