MAQSUD E. NAZAR (1) and S. N. SINHA (2)
(1) Research Scholar, Civil Engg. Department, Indian Institute of Technology, Delhi, New Delhi-110016, India
(2)Professor, Civil Engg. Department, Indian Institute of Technology, Delhi, New Delhi-110016, India
An experimental investigation was carried to evaluate the behaviour of interlocking grouted stabiIlised mud-flyash brick masonry under uniaxial cyclic compressive loading. Five cases of loading at 0°, 22.5°, 45°, 67.5° and 90° to the bed joints were considered. The brick units and masonry system developed by Prof. S N Sinha was used in the present investigation. Eighteen specimens of size 500mm x 100mm x 700mm and twenty seven specimens of size 500mm x 100mm x 500mm were tested. The loops of stress-strain hysterisis obtained from cyclic loading tests were used to determine the energy dissipation characteristics of interlocking grouted stabilised mud-flyash brick masonry. The variation of envelope strain, common point strain and stability point strain with plastic strain had been plotted. A general expression was proposed for the relations between energy dissipation ratio versus envelope strain and energy dissipation ratio versus residual strains. These relations indicate that the deterioration of masonry strength starts at about 0.35 to 0.76 times peak stress depending upon the load case.