摘要
在美国材料试验协会标准ASTM C1550圆板试验方法基础上,提出一种改进的基于裂缝宽度量测技术的纤维混凝土(FRC)材料静定圆板试验方法。该试验方法采用易于现场制作和试验的小尺寸圆板,并运用加载过程中板的径向滑移和转动角度量测技术,通过合理假定和数学推导得到板底中心裂缝宽度值,获得更多板在裂后阶段大变形下有关裂缝开展的实测数据,从而有效地评定纤维混凝土材料的弯曲韧性、延性等材料性能。同时应用有限元方法,分析试验圆板的裂缝开展特点及破坏形态,对比试验研究结果,验证该试验方法为获得裂缝宽度值所做的合理假定,为建立FRC静定圆板的理论计算方法提供依据。
Based on standard test method ASTM C1550 for fibre reinforced concrete （FRC）, a modified round panel test method for the material performance of FRC by measuring crack opening width is presented. Small-size panels that can be easily fabricated and tested in situ were applied, and more testing data of crack opening at the center of panel bottom even under large deflection in post-cracking stage was obtained by measuring both rotation angle and radial sliding displacement. It has been proved that this modified test method can evaluate the flexural toughness and ductility of FRC composite effectively. As a validation of the test observations, the finite element analysis was performed to clarify the crack propagations and failure mode of FRC round panel, which proves the reasonable assumption for attaining to crack mouth opening displacement and also helps establish a theoretical method to predict the structural response of round determinate panel.
出处
《华中科技大学学报（城市科学版）》
CAS
2008年第3期90-94,共5页
Journal of Huazhong University of Science and Technology
基金
国家自然科学基金(50708084)
武汉市青年科技晨光计划项目(20035002016-30)
关键词
纤维混凝土
试验方法
圆板
裂缝宽度
韧性
FRC
test method
round panel
crack mouth opening displacement （CMOD）
toughness
