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本文通过两批模型试验和若干工程实践 ,重点阐明了对高层建筑有明显经济效益的混合配筋预应力混凝土框架扁梁楼盖承受极限荷载时的破坏特征和受力裂缝分布状态。该结构在短期试验的极限荷载下不产生塑性铰。试验结果还表明了采用无粘结筋极限应力增量 Δσp 的改进经验公式 ,其计算值较接近于实测值。双向框架扁梁楼盖结构中 ,板助的内力和配筋不同于普通结构 ,其长向跨度的内力和配筋反而大于短向跨度的内力和配筋
In this paper, through two batches of model tests and several engineering practices, the damage characteristics and the distribution of stress cracks for a hybrid reinforced prestressed concrete frame flat girder floor covering a high-rise building when subjected to ultimate loads are highlighted. This structure does not produce a plastic hinge under the limit load of the short-term test. The test results also show an improved empirical formula using the limit stress increment Δσp of unbonded tendons. The calculated value is closer to the measured value. In the two-way frame flat beam floor structure, the internal force and reinforcement of the plate assist are different from the ordinary structure, and the internal force and reinforcement of the long span are larger than the internal forces and reinforcement of the short span.