An Investigation of Concrete Constitutive Law Considered Property Deviation and Multi-phase Characters Bases on Micro- structureModel

• Main Authors: Shieh-Lung Yeh, 葉協隆
• Other Authors: Ching-Lung Liao
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/34245851879629775921

碩士 === 國立臺灣科技大學 === 營建工程技術學系 === 81 === This study mainly probes into the effect of contact physical property distribution in the stress-strain behavior of concrete materials which are simulated by particle frbric structure . In general micro-structure mechanics researches , either discrete element method or uniform-strain method (continuum method) although can initially estimate granular material behavior by the mathematic models. But all of these researches are based on the condition that the physical property of contact is homogeneous and unique . In practice , when pouring concrete it is hard to control the quality to make it uniform , and micro- cracks often occur between aggregate and mortar after the concrete are poured. Therefore during the simulation, it is impossible that the contact property only have unique bond strength , cohesion strength or contact stiffness . They should have a scatting range . Base on this reason, this study assumes the contact properties are the random variables of normal distribution , and randomly distributes on various contact directions. By changing the coefficient of variation of contact parameters to research the effect of contact property deviation deviation in the stress-strain relationships of concrete materials. The research result shows that the distribution of cohesion between particles will result in the compression stiffness earlierly softing, and increasing the peak strain. The bond strength and normal contact stiffness between particles will reduce the tension strength 、tension stiffness and also make the volume dilatation of concrete occure earlierly .