Analysis of Ductility in Partially Prestressed Concrete Flexural Members
Analysis of Ductility in Partially Prestressed Concrete Flexural Members
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DOI：
10.15554/pcij.05011986.64.87
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发表时间：
1986-05
期刊：
影响因子：
1.1
通讯作者：
A. Naaman;Muhamed H. Harajii;J. Wight
中科院分区：
文献类型：
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作者：
A. Naaman;Muhamed H. Harajii;J. Wight
D是材料、截面、结构元件或结构系统在倒塌之前承受非弹性变形而没有实质性阻力损失的能力的量度。这是建筑物的一个重要安全特性，尤其是那些建在地震带的建筑物。延性在超静定结构中起着重要的作用，它允许超应力从一个临界截面重新分布到另一个临界截面，从而延迟局部破坏。混凝土结构极限状态设计的原理是基于这样的假设：在不断增加的荷载下，有足够的延性，以允许形成塑性铰和可接受的倒塌机制。结构延展性通常与结构中使用的组成材料的延展性相关。然而，结构和材料的延展性可能会显示出不同的趋势。例如，一个过度钢筋混凝土构件将显示出很小的延性，即使用低强度延性混凝土制成;另一方面，一个构件用高强度脆性混凝土制成，如果钢筋比率保持在较低的值，可能会显示出足够的延性。大量的研究都涉及到钢筋混凝土结构的延性问题，只有少数研究是针对预应力混凝土的。部分预应力的使用越来越多（其中钢筋组合
D is a measure of the ability of a material, section, structural element, or structural system to sustain inelastic deformation prior to collapse, without substantial loss in resistance. It is a paramount safety characteristic of structures, especially those built in seismic zones. Ductility plays a significant role in statically indeterminate structures by allowing redistribution of overstresses from one critical section to another thus delaying local failure. The philosophy of limit state design in concrete structures is based on the assumption that sufficient ductility is available under increasing loads to allow formation of plastic hinges and an acceptable collapse mechanism. Structural ductility is often correlated with the ductility of the constituent materials used in the structure. However, structural and material ductilities may show different trends. For instance, an over-reinforced concrete member will show little ductility even if made with a Iow strength ductile concrete; on the other hand, a member made with high strength brittle concrete may show sufficient ductility if the reinforcement ratio is kept at low values. Numerous investigations have dealt with ductility in reinforced concrete structures'45 and a few have been devoted to prestressed concrete. The increasing utilization of partial prestressing (where a combination of reinforcing