A Fracture toughness criterion for concrete
A Fracture toughness criterion for concrete
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DOI：
10.1016/0013-7944(85)90009-8
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发表时间：
1985
影响因子：
5.4
通讯作者：
Y. Jenq;Surendra P. Shah
中科院分区：
文献类型：
--
作者：
Y. Jenq;Surendra P. Shah
许多人试图通过测试缺口梁试件来计算混凝土的I型断裂韧性。根据最大荷载的测量值和初始缺口长度，并使用LEFM开发的公式计算K I c时，其值与梁的尺寸有关。这种尺寸和几何依赖性可以归因于缓慢的裂纹扩展和非线性，由于几何联锁效应。提出了一种与尺寸无关的断裂韧性参数的计算方法。根据所提出的方法，从总位移中提取非弹性位移，并通过考虑裂纹闭合压力来考虑裂纹的缓慢扩展，从而计算kci值。使用这个常数K I c准则，荷载与裂缝开口位移和荷载与挠度曲线被准确地预测了40个不同尺寸的梁，为本研究以及其他研究人员所报道的。
Many have attempted to calculate the fracture toughness of concrete in Mode I by testing notched beam specimens. It has been observed that when K I c is calculated from the measured values of the maximum load, the initial notch length and using the formulas developed from LEFM, its value is dependent on the dimensions of the beam. This size and geometry dependency can be attributed to slow crack growth and nonlinearity due to geometrical interlock effects. A method is suggested to calculate a size independent fracture toughness parameter. To calculate the value of K I c according to the proposed method, inelastic displacements are extracted from the total displacements and the slow crack growth is included by incorporating crack closing-pressure. Using this constant K I c criterion, the load vs crack mouth opening displacement and load vs deflection curves were accurately predicted for 40 beams of different sizes tested for this investigation as well as those reported by other investigators.