一种预测深受弯构件受剪承载力的协调方法

Consistent method to predict shear capacity of deep flexural members

首先对《混凝土结构设计规范》(GB50010—2002)深受弯构件的抗剪设计进行了探讨,指出了其主要不足之处。改进的拉-压杆模型的提出有效地克服了上述问题,其不仅使预应力及非预应力深受弯构件的抗剪设计得到了协调,同时将压杆劈裂破坏、压杆或节点区压溃和拉杆屈服受弯破坏三种主要破坏模式统一了起来。引用文献中39根预应力和71根非预应力深受弯构件的试验数据对改进的拉压杆模型进行了验证,表明其预测结果协调、精确、连续而又偏于安全。

Discussions are firstly carried out about shear design provisions for deep flexural members of Code for design of concrete structures（GB50010-2002）, and some problems are brought forward, which can be overcome by modified strut-and-tie model （MSTM）. The MSTM not only makes the shear design of both prestressed and reinforced deep flexural concrete members consistent, but also unifies three primary modes of failure, that is, diagonal splitting of struts, crushing of struts or nodal zones and yielding of ties. A comparison of 110 beams, of which 39 beams are prestressed flexaral members and the others are reinforced members, shows that the predictions are unified, accurate, consistent and conservative.