动载条件下钢筋混凝土深梁的支撑有效系数

Ammar N. Hanoon , M.S. Jaafar , Farzad Hejazi , F.N.A. Abd Aziz
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引用次数: 9

摘要

针对钢筋混凝土深梁在动荷载作用下的极限抗剪强度,提出了一种基于杆系模型(STM)的杆系有效系数。基于莫尔-库仑破坏准则推导了新的混凝土支撑有效系数。提出并研究了两种混凝土破坏模式:斜裂破坏和混凝土破碎破坏模式。在MATLABSIMULINK环境中对模型的修改进行了仿真。该模型对深梁的动抗剪性能具有较好的评价效果。考虑应变率变化,对钢筋混凝土深梁受弯配筋率、横向配筋率和剪跨深比对其抗剪性能的影响进行了参数化研究。利用文献试验结果验证了所提出的有效系数,对不同荷载条件下钢筋混凝土深梁抗剪强度的预测具有较好的准确性。
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Strut effectiveness factor for reinforced concrete deep beams under dynamic loading conditions

In a current study, a new strut effectiveness factor based on Strut-and-Tie Model (STM) is proposed to assess the ultimate shear strength of reinforced concrete (RC) deep beam subjected to dynamic loads. The derivation of the new effectiveness factor of concrete struts is based on Mohr–Coulomb criterion failure. Two types of concrete failure, diagonal splitting and concrete crushing failure modes, are proposed and examined. The modification of the proposed model is simulated in a MATLABSIMULINK environment. The proposed model exhibits efficiency in assessing dynamic shear resistance for deep beams. Moreover, a parametric study is then conducted to examine the effect of flexural reinforcement ratio, transverse reinforcement and shear-span to depth ratio on shear behavior of RC deep beams with consideration of the changes in strain rate. The proposed effectiveness factor is validated by utilizing the experimental results obtained from the literature and shows good accuracy for prediction the shear strength of reinforced concrete deep beams under different loading conditions.

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