仇一颗，刘霞，林云（湖南大学土木工程学院，长沙 410082）

［摘要］深受弯构件的拉压杆模型已经得到了广泛的认可。为研究混凝土深梁设计中采用的压杆拉杆模型，进行了简支深梁集中荷载下的模型静载试验。试验设计依据为《混凝土结构设计规范》（GB 50010—2010）中深梁的相关规定及美国《混凝土结构建筑规范》（ACI318M05）中压杆-拉杆模型设计的相关规定，试验参数为剪跨比、配筋方式等。试验结果表明，深梁混凝土抗压强度软化系数β与剪跨比和分布钢筋配筋率有关；水平分布筋对于承载力的贡献大于竖向分布钢筋。根据试验结果比较，中国规范对于小剪跨比（λ≤1）深梁的设计有较大的安全储备，美国规范深梁设计中所采用的压杆-拉杆模型较为经济合理。

［关键词］钢筋混凝土简支深梁； 压杆-拉杆模型； 模型试验； 极限承载力

中图分类号：TU398-7文献标识码：A文章编号：1002-848X(2012)01-0091-06

Experimental study on simply supported reinforced concrete deep beams of strut-and-tie models 

Qiu Yike, Liu Xia, Lin Yun(College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract:Strut-and-tie models are widely used in buildings for deep beams. In order to study strut-and-tie models, simply supported deep beams were tested under vertical symmetrical concentrated loads．The theoretical basis is Chinese Code for design of concrete structures(GB 50010—2010) and American code ACI318M-05．The main experimental parameters were beam span to depth ratio, steel reinforcement, and so on．The test results show that the compressive strength softening coefficient β of concrete deep beam was depended on shear span ratio and distributed steel, and horizontal steel has more role than vertical steel. Based on the tests and analysis, the comparison between the formulas given in code GB 50010—2010 and those of code ACI318M-05 as well as experiment data given by simulation analysis were presented. It is also found that λ≤1 in Chinese code is more safety, and strut-and-tie model in American code is more economic and rational.

Keywords:simply supported deep RC beams; Strut-and-Tie models; models tests; ultimate bearing capacity

*国家自然科学基金（50908082），湖南省科技厅项目（2009ZK3111）。

作者简介：仇一颗，副教授，博士研究生，Email：qiuyikebeite@yahoo.com.cn。

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