钢筋陶粒混凝土和普通混凝土断裂参数K_(IC)和CTOD_(IC)的试验分析  

EXPERIMENTAL STUDY AND THEORETICAL ANALYSIS OF FRACTURE PARAMETERS K_(IC) AND CTOD_(IC) OF CERAMSITE REINFORCED CONCRETE AND ORDINARY REINFORCED CONCRETE

作　　者：曹祖同[1] 秦怀泉[1] 陈云霞[1] 姚石良 

机构地区：[1]天津大学土木工程系

出　　处：《天津大学学报》1991年第3期104-113,共10页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目

摘　　要：通过对加筋及无筋陶粒混凝土和普通混凝土带大、小缺口的三点弯曲梁进行试验和有限元分析,对其断裂性能进行研究,分析得到配筋大小、混凝土品种和强度、切口深度对混凝土断裂韧度K_(IC)及临界裂缝尖端张开位移CTOD_(IC)的影响。提出了断裂韧度K_(IC)与混凝土抗拉强度、切口深度的计算公式。试验和分析证实。裂缝开始失稳扩展时,CTOD_(IC)值的变化范围很小,有可能成为控制混凝土失稳断裂的材料参数。Based on the experiment and finite element analysis of reinforced and plain concrete three-point bending beams with various notch depths, the investigation on fracture behavior is conducted. The effect of steel ratio, kinds of concrete, and notch depth on concrete toughnees K_(IC) as well as on crack tip opening displacement is analyzed. Then the calculation formula, reflecting the relationship between the fracture toughness K_(IC) (ceramsite reinforced concrete and ordinary concrete) and tensile strength, notch depth, is presented. On account of the fact that the variation extent of the value of critical crack tip opening displacement CTOD_(IC) is very small, while the cracks begin to propagate unsteadily. It is possible that CTOD_(IC)may be taken as a material parameter for controlling the unstable fracture of concrete.

关 键 词：钢筋混凝土 混凝土 陶粒 断裂性能 

分 类 号：TU375.01[建筑科学—结构工程]