One way and two way slab action (Force flow) I L
One way and two way slab action（Force flow)
SLAB TYPE OYO DES.MOMENT ON STRIPS LOAD AND RESISTANCE CENTROIDS VARIES WITH LOCATION (a)ONE-WAY ISIMPLE SUPPORTS) 发PAM Fig.6-1 当 %, LOAD X 3uPP0R「 4.. M..wy A rough 午来 EDGE LGAD CONSIANT approximation Ib)2-WAY (CORNERS ALLOWED TO CURL UP) STRIP 泸W ALONG of flat slab behavior EDCE LOAD VARIES (cl 2-WAY (CORNERS HELD DOWN) STRIP 么PUN +NCG生WD-NEAR CORNER5 飞 EDGE LOAD VARIES (d)2-WAY (SLAB AND WALL CONTINUOUS) -ALONG EDG色 EDGE LOAD VARIES
Fig. 6-1 A rough approximation of flat slab behavior
Fig.6-2 Very stiff beams acted as wall support (a) (b) 2-WAY SLAB ONE-WAY SLAB CENTER STRIP CENTER STRIP ANY STRIP VERY S STIFF HERY STIFF
Fig.6-2 Very stiff beams acted as wall support
To withstand punch shear at the top of the column,certain measures should be taken: (1) Thickening slab with capital of the column; (2)Strengthening flat slab with web bar; (3)Strengthening by cross beam over the column; (4) Waffle panel filled in
To withstand punch shear at the top of the column, certain measures should be taken: (1) Thickening slab with capital of the column; (2) Strengthening flat slab with web bar; (3) Strengthening by cross beam over the column; (4) Waffle panel filled in
(a)FLAT SLAB ON COLUMN: 1.AS LOAD IS:TRANSMITTED TO COLUMN,THE PUNCHING SHEAR RESISTANCE AREA DECREASES AND FAILURE CAN OCCUR 2REENFORCING BARS OVER THE COLUMNS CAN HELP Fig.6-8 3.PRESTRESSING CABLES DRAPED OVER THE COLUMNS WILL CARRY MUCH OF THE LOAD DIRECTLY TO COLUMNS Details of punching shear (b)LOCAL THICKENING OF SLAB MATERIAL HELPS D0 P PANEL CAPITOL 45 (c)BEAMS OVER COLUMNS (d)WAFFLE PANEL FILLED IN
Fig. 6-8 Details of punching shear