摘要
超高韧性水泥基材料(UHTCC)在结构加固改造中具有巨大潜力,运用断裂力学方法研究了UHTCC加固混凝土梁的开裂行为,其中混凝土以及UHTCC的开裂采用虚拟裂缝模型模拟。通过引入裂缝扩展准则以及裂缝口张开位移的协调条件,建立整体控制方程;通过叠加原理计算得到裂缝尖端净应力强度因子,最后得到荷载-裂缝口张开位移曲线。断裂力学方法计算结果与试验结果吻合良好,为UHTCC加固混凝土梁的设计提供了一种有效的计算手段。
Due to the potential advantages of ultra-high toughness cementitious composite （UHTCC） in structure strengthening and retrofitting, a fracture-mechanics based model is presented. We thus want to analyze the fracture behavior of UHTCC-strengthened concrete beams using the proposed method. The cracking of concrete and UHTCC are both modeled by fictitious crack model. The global equations are built on the basis of the crack extension criterion and the compatibility condition of the crack opening displacement. The K-superposition method is applied to calculate the net crack tip stress intensity factor. By comparing with experimental results, it is shown that the proposed model can accurately capture the overall structural behavior.
出处
《水利水电科技进展》
CSCD
北大核心
2014年第1期53-56,共4页
Advances in Science and Technology of Water Resources
