INVESTIGATION OF PRE-AND POSTCRACKING SHEAR BEHAVIOR OF PRESTRESSED CONCRETE BEAMS USING INNOVATIVE MEASURING TECHNIQUES
INVESTIGATION OF PRE-AND POSTCRACKING SHEAR BEHAVIOR OF PRESTRESSED CONCRETE BEAMS USING INNOVATIVE MEASURING TECHNIQUES
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使用创新测量技术研究预应力混凝土梁的预裂和后裂剪切行为
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
S. Görtz
中科院分区：
文献类型：
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作者：
J. Hegger;A. Sherif;S. Görtz
目前，还没有统一的理论能够完全描述钢筋混凝土(RC)构件在剪切作用下的复杂性能，最近的研究结果往往相互矛盾。利用创新的测试技术，对混凝土梁开裂前后的抗剪性能进行了研究，对钢筋混凝土梁的抗剪机理有了深入的了解。用激光干涉法研究了预裂行为。结果表明，在可见裂纹形成之前，存在非线性应力分布，从而影响裂纹角。应用摄影测量方法研究了后裂纹的行为。利用测得的裂纹边缘位移分量来估算剪切摩擦通过裂纹传递的剪切力。结果表明，对于低配筋率或高配筋率的梁，剪力摩擦传递给裂缝的剪力可以忽略不计。
At present, no unified theory exists that is capable of fully describing the complex behavior of reinforced concrete (RC) elements subjected to shear, with recent research results tending to contradict each other. Using innovative measuring techniques, the pre-and postcracking shear behavior of concrete beams was studied giving insight to the shear resistance mechanism of RC beams. Laser interferometry was used to study the precracking behavior. It is shown that nonlinear stress distributions occur before the formation of visible cracks, thereby influencing the cracking angle. Photogrammetry was applied to study postcracking behavior. The measured displacement components of the crack edges were used to estimate the shear transferred across the cracks by shear friction. It is shown in this paper that for beams with low or high shear reinforcement ratios, the amount of shear force transferred across cracks by shear friction is negligible.