摘要:为研究火灾下预应力混凝土多梁肋 T型结构翘由形态,建立了梁肋单侧火灾下预应力混凝
土多梁胁T型结构的火灾模型,给出了翘曲计算方法,采用 ANSYS分析了梁肋单侧火灾下预应
力泥凝土多梁肋T型结构翘曲規律。研究結果表明:边肋外側受火时,边肋在四分点的橫桥向凸
翘显著,沿纵桥向翘曲呈w型,桥面板呈单側翼蠓板翘曲或双侧翼缘板翘曲形态；边中肋间受火
时，梁肋横桥向翘曲呈V型,翘曲值大;中肋问受火时,梁肋横桥向呈倒w型.桥面板形成受
火区鼓包形态;所得结论可为预应力混凝土多梁胁 T型结构大灾后评估提供科学依据。
关键词:结构工程;预应力混凝土；多梁肋丁型结构；单侧火灾;翘曲;翼缘板
中图分类号：U443.35
文献标志码:A
Analysis of Buckling for Pre-stressed Concrete Multi-beam T-shaped
Structure Exposed to Unilateral Fire
ZHANG Gang', JIANG Chang-an?, LIU Yangt-3, WANG Cui-juan', HE Shuan-hail
(1. School of Highway, Chang'an University, Xi'an 710064,Shaanxi, China: 2. Shaanxi Provincial
Communication Construction Group, Xi'an 710075,Shaanxi, China；3. Guizhou Provincial
Transportation Department, Guiyang 550000, Guizhou, Chinai 4. School of Construction
Machinery, Chang'an University, Xi'an 710064，Shaanxi, China)
Abstract: In order to studv the shaDe of buckling for pre-stressed concrete multi-beam T-sh0cd
structure exposed to fire, the fire model for pre-stressed concrete multi-beam T-shaped structure
xposed to unilateral fire was proposed, and the buckling calculation method was put forward.
Moreover, the buckling law for pre-stressed concrete multi-beam T-shaped structure exposed to
unilateral fire of girder was analyzed by ANSYS. The study results indicate that when bias girder
is exposed to unilateral fire, transverse buckling of girder at quartile is obvious, it presents w-
shape along longitudinal bridge span, deck presents a shape of buckling for single flange plate or
double flange plates. Transverse buckling of girder presents v-shape when girder exposed to fire
between bias and middle girders, its buckling value is high. Transverse buckling of girder
presents a reversed w-shape when girder exposed to fire between middle girders, deck presents a
convex shape. The obtained conclusion can provide scientific r estimating the pre
stressed concrete multi-beam T-shaped structure after fire.
Key words：structure engineering；pre stressed concrete；multi-beam T-shaped structure；unilat-
eral fire；buckling；flange plate

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