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首页> 美国政府科技报告 >Concrete Mechanics. Part A. Theory and Experiments on the Mechanical Behaviour of Cracks in Plain and Reinforced Concrete Subjected to Shear Loading
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Concrete Mechanics. Part A. Theory and Experiments on the Mechanical Behaviour of Cracks in Plain and Reinforced Concrete Subjected to Shear Loading

机译：具体力学。 a部分剪切载荷下普通钢筋混凝土裂缝力学行为的理论与实验

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As result of the increasing difficulties in structural design associated with the increase in scale and complexity of new structures and their loading conditions in recent years, added impetus has been given to the development of numerical calculation techniques. Above all, the nonlinear finite element methods, which are still being refined, may become powerful tools in future design. These methods, however, can only show to full advantage if the material characteristics to be inserted are adequately known. One of the characteristics affected by lack of information concerns the mechanism of transmission of forces across cracks whose faces are subjected to shear displacements. This mechanism is achieved by interaction of several components: axial and transverse stiffness (dowel action) of the reinforcement and direct transfer of forces between the rough concrete crack faces, generally denoted by the term 'aggregate interlock'. Experimental research and the derivation of a theoretical model gave insight into this phenomenon. Tests were carried out on precracked shear specimens. Variables in the tests were: the type of reinforcement (embedded reinforcing bars, external restraint bars), the concrete strength, the type of the concrete (sand gravel concrete, lightweight concrete), the grading of the concrete (continuous, discontinuous), the scale of the concrete, and the initial crack width. Measurements have been carried out for determining the shear force, the crack displacements and, for the specimens with external reinforcement, the force in the restraining bars.

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