FAILURE PROCESS MODELING OF CONCRETE SUBJECTED TO ELEVATED TEMPERATURE
The different coefficients of thermal expansion between aggregate and mortar matrix is one of major factors resulting in the initiation and propagation of thermal cracking in concrete as it subjected to temperature elevation. In this study, the thermal cracking in concrete is studied by the RFPA (Realistic Failure Process Analysis) code, which regards concrete as a three-phase composite consisting of mortar matrix, coarse aggregates and interfacial transition zone(ITZ), and Weibull distribution law is used to simulate the heterogeneity nature of three constituents. The simulated failure processes of three samples with different volume fraction of coarse aggregate (VFCA) indicate that failures easier occurred with the increase of VFCA. As temperature elevation, stresses concentrate around the interfaces due to mismatched thermal expansion between mortar matrix and coarse aggregates. Failures occur in the ITZ at first and subsequently propagating into mortar matrix. The coalescence of cracks finally results in the breakdown of the concrete. Simulations also reveal that cracks will penetrate through the coarse aggregates due to higher shear stress.
SHIBIN TANG CHUNAN TANG ZHENGZHAO LIANG LIANCHONG LI YAFANG ZHANG
School of Civil and Hydraulic Engineering Dalian University of Technology, Dalian 116024, China Faculty of Civil Engineering Guangzhou University, Guangzhou, 510006, China
国际会议
三亚
英文
221-224
2009-05-24（万方平台首次上网日期，不代表论文的发表时间）