Laserfiche WebLink
P1.121 <br />NARRATION: <br />1-AN EXISTING 12" CONCRETE WALL WAS DISCOVERED DURING FIELD EXPLORATION <br />ALONG GRIDLINE 16, BETWEEN GRIDS G.3 AND F.3 IN WHICH A PROPOSED NEW <br />OPENING TO OCCUR <br />2-ORIGINAL CONSTRUCTION AS-BUILTS, PREPARED BY SVERDRUP BUILDING <br />CORPORATION AND DATED 1991, DO NOT SHOW THE CONCRETE WALL, AND THERE <br />WERE NO ADDITIONAL RETROFITS TO THIS BUILDING ON RECORD. <br />3-A SCAN OF THIS WALL SHOWED A DOUBLE LAYER OF #5 @ 12" O.C. IN EACH WAY <br />AND NO JAMB BARS. WALL STOPPED BELOW EXISTING BEAM, WITH NO STIFFNERS <br />NOR BEAM BRACING NOTED <br />4-FIELD INVESTIGATION DID NOT SHOW ANY SPECIAL DRAG CONNECTIONS NOR <br />DETAILING <br />5-WE LIMITED THE OPENING TO 2’-8” NOT TO EXCEED 10% OF TOTAL WALL LENGTH, <br />THEREFORE DOES NOT EXCEED THE THRESHOLD OF A SEISMIC RETROFIT PER IEBC <br />805.3 (SEE NEXT PAGE) <br />6-FOLLOWING CALCULATION SHOWS STEEL VERTICAL AND HORIZONTAL OPENING <br />REINFORCEMENTS WE ADDED <br />RAD <br />4/2/24 <br />23-12434OC PROBATION CENTER <br />FIRST FLOOR- GRIDLINES 16, F.3 TO G.3 <br />1700 E St Andrew Pl - 101118387, <br />20182190, 30146952 & 40138878 <br />6/5/2024