8-9. Sensitivity of model to the number of micro columns ................................ 170

8-10. Experimental and calculated stress-strain curves for unconfined control
 cy lin d ers ................................ ............ ........................................ 17 1

8-11. Restraint of micro columns by CFRP grid strand.............................................172

8-12. Geometry of micro column restrained by the CFRP grid.............. ............... 173

8-13. Lateral stiffness of CFRP grid ring....................... .. ... ...............174

8-14. Stress-strain curves for grid diameter of 5.25 in .................................................176

8-15. Stress-strain curves for grid diameter of 5.5 in. ............. ........................ ......... 177

8-16. Stress-strain curves for different amounts of CFRP grid ......................................177