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中文摘要：
采用楔入劈拉试样研究高强混凝土的双K断裂参数测试和计算方法。利用应变片测定试件的起裂荷载,计算得到试件精确的起裂断裂韧度。认为利用普通混凝土双线性软化曲线的经验参数,并基于虚拟裂缝扩展黏聚力强度理论间接计算得到的起裂断裂韧度值偏小,因此迫切需要进一步研究高强混凝土软化曲线的参数,以完善混凝土的双K断裂理论。
英文摘要：
The tests and methods of double-K fracture parameters for high strength concrete were studied by use of the splitting wedge samples.The initial load of the samples was determined by the strain gauges,and the exact initial fracture toughness was calculated.The initial fracture toughness indirectly calculated based on cohesive strength theory with virtual crack propagation whose empirical parameters employ bilinear softening curves of ordinary concrete was much smaller.Accordingly,it was urgent to further study parameters of softening curve for high strength concrete so as to improve the double-K fracture theory for concrete.
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