INELASTIC RESPONSE AND EFFECTIVE DESIGN OF ASYMMETRIC BUILDINGS UNDER STRONG EARTHQUAKE LOADING DUAN XIAO NIAN A THESIS SUBMITTED TO THE UNIVERSITY OF LONDON FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING, UNIVERSITY COLLEGE LONDON, GOWER STREET, LONDON WC1E 6BT, U.K. OCTOBER 1991