【摘要】 基于虚裂纹模型概念的断裂能G_F是一个能较真实反映混凝上断裂特性的材料参数。本文除用RILEL规定的100mm×100mm×800mm三点弯曲梁进行了G_F测试外,还分别进行了100mm×100mm×600mm和100mm×100mm×400mm短跨度三点弯曲梁的C_F测试,全部试验在自行设计、加工的刚性加载架上进行,测得800mm标准梁C_F=137.0N/m,另两种短梁G_F分别为131.6N/m和128.6N/m。从而表明,跨度对G_F并无明显影响。本文还介绍了G_F测试原理和刚性加载架的设计原则,并对测试结果进行了讨论和分析。更多还原

【Abstract】 Fracture energy G_F based on the concrete of FCM（Fictitious Crack Model）is a material property parameter that can well reflect the fracture behaviour of concrate.This paper presents the test results for three-point bending beams of 100mm×100mm×800mm,the size being stipulated by RILEM.To explore the effect of span.a G_F test is also performed for beams of 100mm×100mm×600mm and 100mm×100mm×400mm.For each specimen 12 beams are used.They are all tested on the rigidity machine designed by the authors themselves.When the lengths of specimens are 800mm 600mm and 400mm,the values of G_F are 137.0N/m,131.6N/m and 128.6N/m,respectively.The test results show that the effect of span is not obvious.In addition,this paper alsogi ves the results of K_1c and G_Ic for each specimen.更多还原