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Analytical model for flexural and shear strength of normal and high-strength concrete beams

机译：正常和高强度混凝土梁弯曲剪力强度的分析模型

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摘要

In the present paper, an analytical model is proposed to determine the flexural and shear strength of normal and high-strength reinforced concrete beams with longitudinal bars, in the presence of transverse stirrups. The model is based on evaluation of the resistance contribution due to beam and arch actions including interaction with stirrups. For the resistance contribution of the main bars in tension the residual bond adherence of steel bars, including the effect of stirrups and the crack spacing of R.C. beams, is considered. The compressive strength of the compressed arch is also verified by taking into account the biaxial state of stresses. The model was verified on the basis of experimental data available in the literature and it is able to include the following variables in the resistance provision: - geometrical percentage of steel bars; - depth-to-shear span ratio; resistance of materials; - crack spacing; - tensile stress in main bars; - residual bond resistance including the presence of stirrups;- size effects. Finally, some of the more recent analytical expressions able to predict shear and flexural resistance of concrete beams are mentioned and a comparison is made with experimental data.
机译：在本文中，提出了一种分析模型，用于确定横向箍筋的存在下具有纵向杆的正常和高强度钢筋混凝土梁的弯曲和剪切强度。该模型基于对梁和拱形动作引起的电阻贡献的评估，包括与搅拌器的相互作用。对于主杆张力的电阻贡献，钢筋的残余键粘附，包括搅拌的效果和r.c的裂纹间距。被认为是光束。通过考虑压力的偏心状态，还验证了压缩拱的压缩强度。该模型是根据文献中可用的实验数据验证的，并且能够在电阻提供以下变量： - 钢筋的几何百分比; - 深度剪切跨度率;材料的抵抗力; - 裂缝间距; - 主杆的拉伸应力; - 残留粘合性，包括搅拌的存在; - 尺寸效果。最后，列举了一些能够预测混凝土梁的剪切和抗弯曲电阻的一些更新的分析表达式，并用实验数据进行比较。

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