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首页> 外文期刊>Engineering Fracture Mechanics >Determination of the crack initiation stress, elastic modulus and ultimate crack length in TPBT concrete beams based on shear deformation theory
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Determination of the crack initiation stress, elastic modulus and ultimate crack length in TPBT concrete beams based on shear deformation theory

机译：基于剪切变形理论的TPBT混凝土梁裂纹启动应力，弹性模量和极限裂缝长度的测定

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摘要

Shear deformation theory was adopted in this research to analyse the crack initiation stress occurred in the three-point bending test (TPBT) on concrete beams. For TPBT concrete beams with different spans, the influence of shear force on the maximum stress and mid-span deflection was analysed. The relationship of the crack initiation stress, the modulus of rupture and splitting tensile strength was also studied. It was found that the crack initiation stress was about 90 percent of the modulus of rupture provided by the ASTM, British and European codes, and it was 1.125 times of the splitting tensile strength. Experimental study on notched concrete beams was also undertaken to validate the analytical results. For notched concrete beams in TPBT, calculations of elastic modulus and ultimate crack length are presented.
机译：采用剪切变形理论在本研究中采用，分析混凝土梁上三点弯曲试验（TPBT）中发生的裂纹启动应力。 对于具有不同跨度的TPBT混凝土梁，分析了剪切力对最大应力和中跨偏转的影响。 还研究了裂纹启动应力，破裂模量和分裂拉伸强度的关系。 发现裂纹启动应力约为ASTM，英国和欧洲代码的破裂模量的90％，并且它是分裂拉伸强度的1.125倍。 还进行了对缺口混凝土梁的实验研究，以验证分析结果。 对于TPBT中的缺口混凝土梁，提出了弹性模量和极限裂缝长度的计算。

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