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中文摘要：
对9块12．6m×1．5m后张无黏结预应力混凝土三跨连续板在火灾后性能进行了检测。试验首先按照IS0834标准曲线升温，到一定时间后采用自然冷却方式进行降温，并维持2．0kN／m^2的使用荷载不变。得出了板的变形及支反力、预应力变化情况，从而得出了灾后内力重分布的规律。裂缝基本没有新的发展，其宽度有所减小。为今后无黏结预应力混凝土结构的灾后行为研究提供依据。
英文摘要：
The fire behaviors of 9 unbonded prestressed concrete continuous slabs with three spans of 12.6 m length and 1.5 m width were detected,alter exposed to ISO834 standardized heating regime and 2.0 kN/m2 load.From the test results,the regularities of deformations,reactions and prestresses are presented.Regulations of internal force redistribution are given.Distributions of cracks of spans after fire have no increasing, and the cracks widths decrease.Conclusions of this study provide a basis for further research to explore fire behaviors of prestressed concrete structures with unbonded tendon.
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