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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Experimental testing of concrete beams with different levels of prestressing
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Experimental testing of concrete beams with different levels of prestressing

机译：不同水平预应力混凝土梁的试验测试

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The behaviour of actual prestressed concrete beams under static load up to failure has been experimentally investigated. The experimental testing includes five types of precast concrete beams with different ratios of prestressed and classical reinforcements (only prestressed reinforcement, dominant prestressed reinforcement and classical reinforcement, equal prestressed and classical reinforcements, dominant classical reinforcement and prestressed reinforcement, and only classical reinforcement) i.e. with different levels of prestressing force. Twenty-three beams were tested. The total amount of reinforcement in each beam was selected to provide approximately equal ultimate bending bearing capacity. The deflections, concrete stresses, stresses in classical and prestressed reinforcements and concrete cracks were monitored until the beams collapsed. It was concluded that by increasing the level of prestressing, the serviceability limit state of the beams was improved. The optimal level of prestressing should be selected based on the relevant criteria for each individual structure.
机译：已经通过实验研究了实际的预应力混凝土梁在静载荷作用下直至破坏的性能。实验测试包括五种类型的预制混凝土梁，它们具有不同比例的预应力和经典钢筋（仅预应力钢筋，支配预应力钢筋和经典钢筋，均等的预应力和经典钢筋，支配经典钢筋和预应力钢筋以及仅经典钢筋），即不同水平的预应力。测试了二十三个光束。选择每个梁中的钢筋总量以提供近似相等的极限弯曲承载力。监测挠度，混凝土应力，经典和预应力钢筋中的应力以及混凝土裂缝，直到梁坍塌为止。结论是，通过增加预应力水平，改善了梁的使用寿命极限状态。应根据每个单独结构的相关标准选择最佳的预应力水平。

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