Author(s)

K. Sonoda, H. Kobayashi & M. Matsuura

Abstract

Impact fracture analysis of reinforced concrete rock sheds K. Sonoda, H. Kobayashi & M. Matsuura Department of Civil Engineering, Osaka City University, Osaka 558, Japan ABSTRACT Numerical analyses of impact fracture problems of reinforced concrete rock sheds are carried out using Rigid Body Spring Model (RBSM) within a frame theory. The rock sheds considered here are of a type of portal frame whose roof is covered with sand cushion. A number of numerical simulations are executed under various loading conditions such as weights of rock-mass, rock fall-heights, collisions angles of rock-fall and so on. Two types of failure mode are observed, one is bending failure mode and the other is shear failure mode due to diagonal cracks of concrete. From the numerical results obtained, the difference between the statical and the impact (dynamical) characteristics of the rock sheds are discussed. INTRODUCTION Main loads for design of rock sheds are rock-fall loads in

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