This study examines the role of inelastic shear deformations in attenuating response of structural walls subjected to seismic excitation. Particular emphasis is placed on required shear strength having regard to damage potential, usable ductilities, and strength erosion. First the load-deformation relations for reinforced concrete structural walls failing in shear are discussed and simplified modelling of these relations introduced. Previous analytic studies using this simplified modelling and artificial earthquake simulation are then reviewed. This present study uses similar procedures to those previously employed, but with real earthquake accelerograms, and a modelling refined to account for strength erosion. It is demonstrated through simple concepts correlated by time history analyses that existing code provisions may be unnecessarily conservative in many applications.
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AbstractA pluck and decay, structural damping test was conducted on a 1/3 scale steel riser section in air, in an attempt to quantify the damping coefficients of single pipe and multi-pipe riser systems, and to understand the damping mechanisms involved. The test rig consisted of a vertically cantilevered pipe, fixed at the base and with provisions to add inner pipes to turn into concentric multi-pipe configurations. The results of this test program are probably the first large scale damping data applicable to steel riser systems.
The design and detailing of earthquake resistant reinforced concrete shear walls of limited ductility designed by a modified strength design method are discussed. Suitable methods for the evaluation of actions and the determination of internal actions are advanced, having regard to energy dissipation and the consequences of heavy damage or of collapse. Discussion is not restricted to uniform walls, but is extended to walls with openings, for which a suggested classification and treatment is presented, thus allowing for suitable design techniques for walls transitional between uniform walls and frames to be determined. Applications of the proposals are illustrated in an Appendix.
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