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首页> 外文期刊>Magazine of Concrete Research >Size effect in shear strength of large beams- behaviour and finite element modelling
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Size effect in shear strength of large beams- behaviour and finite element modelling

机译：大梁抗剪强度的尺寸效应-行为与有限元建模

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This paper investigates the effects of the shear span:depth a/d ratio and effective depth d on the behaviour and shear strength of large reinforced concrete deep and shallow beams. A total of seven large- and medium-sized specimens were tested to failure under two-point symmetric top loading to determine their diagonal cracking and ultimate shear strengths. It was found that the beams' ultimate shear strength reduced sharply when the overall height increased from 500 to 1000 mm. The diagonal cracking strength was, however, not size dependent. The shear strength reduction is related to the a/d ratio: that is, at a critical a/d value, the size effect becomes very pronounced; beyond it, the size effect is not as apparent. After diagonal cracking has occurred, deep beams behave like a tied arch, with uncracked concrete as compression struts and main longitudinal reinforcement as tension ties, A finite element program 'WCOMD' was used to supplement the experimental investigation on size effect. Based on test results, finite element modelling (FEM) and a tied arch analogy, the myth of size effect is unravelled.
机译：本文研究了剪力跨距：深度a / d比和有效深度d对大型钢筋混凝土深，浅梁的性能和抗剪强度的影响。总共测试了七个大中型样品在两点对称顶部载荷下的破坏，以确定它们的对角线开裂和极限剪切强度。结果发现，当总高度从500 mm增加到1000 mm时，梁的极限抗剪强度急剧下降。然而，对角抗裂强度与尺寸无关。剪切强度的降低与a / d比有关：也就是说，在a / d临界值时，尺寸效应变得非常明显；除此之外，规模效应并不明显。对角线开裂后，深梁表现得像是一个拱形拱门，未开裂的混凝土作为压杆，主要的纵向钢筋作为拉力带。有限元程序“ WCOMD”用于补充尺寸效应的实验研究。根据测试结果，有限元建模（FEM）和类似的拱形关系，可以揭示尺寸效应的神话。

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