present a new analysis method in this paper, which employs lattice type numerical modeling and has the two distinct features. One of them is the introduction of four different types lattice members for interaction of each constituents; mortar, coase aggregate,…
present a new analysis method in this paper, which employs lattice type numerical modeling and has the two distinct features. One of them is the introduction of four different types lattice members for interaction of each constituents; mortar, coase aggregate, steel and bond members, each of which is given a simple· constitutive model. The other is the realistic representation of the meso-scopic geometrical configuration of concrete, which can be realized by the image-based geometry modeling technique. Since the latter incorporate the accurate meso-scopic morphology with the former modeling scheme, the proposed method enables us to capture the craking (or localozation) behavior induced by the meso-scopic heterogeneity. Several numerical example suc- cesfully demonstrate the so-called compressive failure of concrete specimens under uniaxial loading and the dependency of the failure modes of reinforced concrete beams on height-span ratio. INTRODUCTION ties for the macro-scale ones, as can be anticipated Concrete, which is known as a quasi-brittle material, from Figure I. consists of several distinct materials and its failure In a macro-scopic model, concrete is commonly re- mechanisms are complex due to the local (or meso- garded as a homogeneous material and the governing scale) heterogeneity and localization behavior with equations are provided often within the framework of cracking.