An Experimental And Analytical Study OnStrength And Deformation Capacity Of AnchorSystem Of Metal Liners Under Impact Loading

Abstract

The ultimate strength and deformation capacity of anchor system of metal liners covering concrete surface subjected to cyclic impact loading are studied experimentally and analytically. The metal liners having anchor bolts and ribs are designed to protect sleeve part of sabo dams, water-course floor, and debris barriers from scouring and impact loading of rocks. A design method, independent of impact cyclic loading patterns, is suggested considering the energy absorption capacity of the metal liners. INTRODUCTION Because of the avalanche of gravels and rocks in debris flow, the collision of rocks on the sleeve part, debris barriers, and water-course floor of sabo dams, the concrete surface is subject to erosion, destruction and abrasion damages[1.2]. One method of protecting the concrete surface that has been tested recently is by attaching lining material such as metal liners. However, the strength and deformation characteristics of structures with metal liners under impact loading have not been clarified yet. and therefore, the design method of such structures is still unestablished. In this research, static tests for several types of metal liners are done. This is followed by dynamic tests in order to clarify the characteristics of the failure load,deformation behavior and energy absorption capacity of the anchor system. Transactions on the Built Environment vol 8, © 1994 WIT Press, www.witpress.com, ISSN 1743-3509 176 Structures under Shock and Impact Then, the impact force in the metal liner obtained from the tests is compared with the results of numerical analysis using DYNA3D. Finally, a design method of the anchor of the metal liner, based on the energy absorption capacity, is suggested. STATIC TESTS Profile of Metal Liners and Test Specimens: Three shapes of the metal liners arc used in the static tests as shown in Fig. 1. These shapes are : ( a,) flat plate liner (Flat-Type), (b) liner with cruciform rib (Rib-Type), and (c) a liner with a leg rib (Leg-Type). Two kinds of material are used: abrasion resisting chrome iron and mangan iron. The anchor system for the Flat-Type and Rib-Type is four anchor bolts made of reinforcement bars, and that for the Legtype is two anchor bolts attached to the lower part of the leg. The dimensions of the plate of the liner in all three types are 40cmx40cmx5cm. (a) Flat-Type (b) Rib-Type Figure 1: Profile of Metal Liners g r~ / incl / I al iner f~ ~i •lid layer