摘要
根据所使用的混凝土本构模型,采用分段拟合的方式,导出了单调荷载作用下混凝土的受拉损伤指标;提出了混凝土梁在单调荷载作用下的弯曲损伤指标β,推导得到了它的解析表达式,通过单轴拉伸实验对受拉损伤指标以及弯曲损伤指标β的合理性进行了验证,得到了混凝土梁弯曲损伤指标随应变的变化规律.结果表明混凝土梁在峰值以前的损伤是不可忽略的,邻近峰值时,其抗弯刚度降低29.12%,在梁丧失承载力时损伤为0.79.
A tensile damage index was obtained based on subsection curve fitting the concrete model, which is varied with strain under monotonic loading. The analytic expression of beam- bending damage index β was obtained. The rationality of the tensile and bending damage indexs were proved appropriate by the uniaxial tension tests of concrete, and the rule of bending dam- age index altered with strain was obtained. The results show that the damage of beam can not be ignored before load get at the peak point,and when gets the point, the stiffness of beam takes 29.12% off,the damage is only 0. 79 at the beam losing its bearing capacity.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2009年第2期159-163,共5页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(50478077)
关键词
混凝土
单调荷载
损伤指标
concrete
monotonic loading
damage indexp
