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Mechanical model of shear bearing capacity of concrete at construction joint

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Document pages: 12 pages

Abstract: This study investigates the reliability and limitations of the normative equation used to determine the shear friction strength of concrete interface with construction joints. This was achieved by examining the normative equations (ACI 318-14, AASHTO and FIB 2010) and comparing the results predicted by the equations with the experimental data of 207 push away specimens (133 rough construction joints and 74 smooth construction joints). The comprehensive mechanical model of the overall interface derived from the upper limit theorem of concrete plasticity is also modified to estimate the shear friction strength of the construction joint. The upper limit of shear friction strength is determined by the crushing failure limit of concrete under the action of tension and compression bars along the interface to avoid overestimating sher transfer capacity of transverse reinforcement with a high clamping force. Code equations are highly conservative and dispersive in predicting the shear friction strength of rough construction joints and yield large scattering in the data for the ratios between the measured and predicted shear friction strengths. The predictions obtained using the proposed model agreed well with test results, indicating correlating trends with the test results for evaluating the effects of various parameters on the shear friction strength of rough construction joints. According to the proposed model, the values of cohesion and coefficient of friction for concrete could be determined as 0.11 and 0.64, respectively, for smooth construction joints and 0.27 and 0.95, respectively, for rough construction joints, where is the compressive strength of concrete.

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