DYNAMIC RESPONSE OF DAM-RESERVOIR SYSTEMS: REVIEW AND A SEMI-ANALYTICAL PROPOSAL

Abstract

THIS PAPER PRESENTS A REVIEW OF CURRENT TECHNIQUES EMPLOYED FOR DYNAMIC ANALYSIS OF CONCRETE GRAVITY DAMS UNDER SEISMIC ACTION. TRADITIONAL PROCEDURES APPLIED IN DESIGN BUREAUS, SUCH AS THE PSEUDO-STATIC METHOD, OFTEN NEGLECT STRUCTURAL DYNAMIC PROPERTIES, AS WELL AS GROUND AMPLIFICATION EFFECTS. A PRACTICAL ALTERNATIVE ARISES WITH THE PSEUDO-DYNAMIC METHOD, WHICH CONSIDERS A SIMPLIFIED SPECTRUM RESPONSE IN THE FUNDAMENTAL MODE. THE AUTHORS PROPOSE A SELF-CONTAINED DEVELOPMENT AND DETAILED EXAMPLES OF THIS LATTER METHOD, INCLUDING A COMPARISON WITH FINITE ELEMENT MODELS USING TRANSIENT RESPONSE OF FLUID-STRUCTURE SYSTEMS. IT IS VERIFIED THAT APPLICATION OF THE TRADITIONAL PROCEDURE SHOULD BE DONE CAREFULLY AND LIMITED TO EXTREMELY RIGID DAMS. ON THE OTHER HAND, THE PROPOSED DEVELOPMENT IS STRAIGHTFORWARD AND IN AGREEMENT WITH FINITE ELEMENT RESULTS FOR GENERAL CASES WHERE DAM FLEXIBILITY PLAYS AN IMPORTANT ROLE.