（东南大学混凝土及预应力混凝土结构教育部重点实验室，南京 210096）
［摘要］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。
［关键词］深受弯构件；受剪承载力；改进拉-压杆模型
Consistent method to predict shear capacity of deep flexural members
Wang Guolin，Meng Shaoping，Huang Shiping(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast Uni., Nanjing 210096,China)
Abstract: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 flexural members and the others are reinforced members, shows that the predictions are unified, accurate, consistent and conservative.
Keywords:deep flexural member; shear capacity; modified strut-and-tie model
作者简介：王国林，博士研究生，Email:felixwseu@163.com。
参考文献
［1］GB50010—2002混凝土结构设计规范［S］. 北京：中国建筑工业出版社，2002
［2］ALSHEGEIR A, RAMIREZ J A. Strut-tie approach of pretentioned deep beam［J］. ACI Structural Journal,1992, 89(3)：296-304
［3］TENG S, KONG F K, POH S P. Shear strength of reinforced and prestressed concrete deep beams. Part II: The supporting evidence［J］. Proceedings of the Institution of Civil Engineers, Structures and Buildings, 1998, 128(2)：124-143
［4］TAN-K H, LU H L, TENG S. Size effect in large prestressed concrete deep beams［J］. ACI Structural Journal,1999, 96(6)：937-946
［5］TAN-K H, TONG K. Shear behaviour and analysis of partially prestressed I-girders［J］. The Structural Engineer,1999, 77(23-24)：28-34
［6］ASCE-ACI-committee 445 on Shear and Torsion. Recent approaches on shear design of structural concrete［J］. Journal of Structural Engineering, 1998, 124(12)：1375-1417
［7］TAN K H, KONG F K, TENG S, et al.High strength concrete deep beams with effective span and shear span and shear span variations［J］.ACI Structure Journal,1995, 92(S37)：395-405
［8］TAN K H, TONG K, TANG C Y. Direct strut-and-tie model for prestressed deep beam［J］. Journal of Structural Engineering, 2001, 127(9)：1076-1084
［9］TANG C Y, TAN K H. Interactive mechanical model for shear strength of deep-beams［J］. Journal of Structural Engineering, 2004, 130(10)：1534-1544
［10］王国林，孟少平，张运涛，等. 基于改进拉压杆模型的预应力混凝土深受弯构件受剪承载力预测［J］. 东南大学学报（自然科学版）,2007, 37 (5)：898-903
［11］Building-Code Requirements for Structural Concrete (ACI318—05) and Commentary(ACI 318R—05)［S］. Farmington(MI)：American Concrete Institute, 2005
［12］中国建筑科学研究院. 混凝土结构设计［M］. 北京：中国建筑工业出版社，2002
［13］SMITH K N, VANTSIOTIS A S. Shear strength of deep beams［J］. ACI Journal,1982, 79(22)：201-213