Download - Keystone

DESIGN MANUAL& KEYWALL OPERATING GUIDEEAASHTO LRFD METHODOLOGY LEVEL SURCHARGE - 250 PSF14) Connection StrengthThe last major item to check is the geogrid connection strength. KeyWall incorporates the laboratoryconnection test data for all Keystone unit types connected to different geogrid types. The followingchart is applicable for Compac II units and Mirafi 3XT geogrid in this example:2500Connection Force (plf)20001500100050000 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 5500Normal Force (plf)The equations for these connection curves are:Peak Connection = 915 plf + N Tan 45˚ up to N = 1074 plfN > 1074 = 1465 + NTan 26° < 2571 plf maxHeight Grid Depth N [ φ GEO / (RF cn-d x RF cn-cr )] x Tpeak = T cl Load5) 8.67' 3XT 1.33' 160 0.9 1.10 1.10 1075 800 3484) 6.67' 3XT 3.33' 400 0.9 1.10 1.10 1315 978 4963) 4.67' 3XT 5.33' 640 0.9 1.10 1.10 1555 1157 6812) 2.67' 3XT 7.33' 880 0.9 1.10 1.10 1795 1335 8661) 0.67' 3XT 9.33' 1120 0.9 1.10 1.10 2011 1496 863OK - Calculated loads are less than the maximum allowable for Peak connection criteria.(AASHTO LRFD method does not check serviceability as the default setting)E.9