Tính tóan thép sàn

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Project Spreadsheets to BS 8110 & EC2 REINFORCED CONCRETE COUNCIL Client Advisory Group Made by Date Page Location 32nd floor corner panel F to G: 1 to 2 RMW 22Apr2009 130 2WAY SPANNING INSITU CONCRETE SLABS to BS 8110:1997 (Table 3.14) Checked Revision Job No Originated from RCC94.xls on CD © 1999 BCA for RCC chg R68 DIMENSIONS MATERIALS STATUS VALID DESIGN short span, lx m 8.10 fcu N/mm² 40 γc = 1.50 F G long span, ly m 12.00 fy N/mm² 460 γs = 1.05 Edge 1 1 Lx = 8.1 m h mm 250 Density kN/m³ 23.6 Top cover mm 20 (Normal weight concrete) Plan Btm cover mm 20 Edge 4 Edge 2 LOADING characteristic EDGE CONDITIONS Self weight kN/m² 5.90 Edge 1 D C = Continuous Extra dead kN/m² 1.50 Edge 2 D D = Discontinuous Ly = 12 m Total Dead, gk kN/m² 7.40 γf= 1.40 Edge 3 C Imposed, qk kN/m² 5.00 γf= 1.60 Edge 4 C 2 Design load, n kN/m² 18.36 See Figure 3.8 and clauses 3.5.3.56 Edge 3 SHORT LONG EDGE 1 EDGE 2 EDGE 3 EDGE 4 BS8110 MAIN STEEL SPAN SPAN Free Free Continuous Continuous Reference ßs 0.058 0.034 0.000 0.000 0.077 0.045 Table 3.14 M kNm/m 69.8 41.0 0.0 0.0 93.0 54.6 d mm 222.0 208.0 225.0 208.0 222.0 208.0 k' 0.156 0.156 0.156 0.156 0.156 0.156 k 0.035 0.024 0.000 0.000 0.047 0.032 Z mm 210.9 197.6 213.8 197.6 209.7 197.6 3.4.4.4 As req mm²/m 755 473 0 0 1013 631 As min mm²/m 325 325 325 325 325 325 Table 3.25 As deflection mm²/m 966 605 ~ ~ ~ ~ Ø mm 16 12 10 12 16 12 Layer B 1 B 2 T 1 T 2 T 1 T 2 @ mm 200 175 225 325 175 175 As prov mm²/m 1005 646 349 348 1149 646 = % 0.453 0.311 0.155 0.167 0.518 0.311 % S max mm 616 636 685 636 397 530 Clause Subclause (b) (a) (a) (a) (b) (b) 3.12.11.2.7 DEFLECTION fs 230 225 0 0 270 299 Eqn 8 Mod factor 1.437 Eqn 7 Perm L/d 37.37 Actual L/d 36.49 As enhanced 27.9% for deflection control Table 3.10 TORSION STEEL BOTH EDGES DISCONTINUOUS ONE EDGE DISCONTINUOUS Ø mm 10 X Y X Y As req mm²/m 349 566 325 3.5.3.5 As prov T mm²/m 348 349 348 Additional As T req mm²/m 326 328 0 0 As prov B mm²/m 1005 646 1005 646 Bottom steel not curtailed in edge strips at free edges SUPPORT REACTIONS (kN/m char uno) (See Figure 3.10) Sum ßvx = 0.888 Table 3.15 EDGE 1 EDGE 2 EDGE 3 EDGE 4 Sum ßvy = 0.660 1, FG G, 21 2, FG F, 21 equations ßv 0.355 0.264 0.533 0.396 19 & 20 Dead kN/m 21.29 15.82 31.93 23.74 Imposed kN/m 14.38 10.69 21.57 16.04 Vs kN/m 52.8 39.3 79.2 58.9 OUTPUT/SUMMARY SHORT LONG EDGE 1 EDGE 2 EDGE 3 EDGE 4 PROVIDE SPAN SPAN 1, FG G, 21 2, FG F, 21 MAIN STEEL T16 @ 200 B1 T12 @ 175 B2 T10 @ 225 T1 T12 @ 325 T2 T16 @ 175 T1 T12 @ 175 T2 ADDITIONAL 0 CORNER 2 CORNER 3 CORNER 4 TORSION STEEL 0 G1 G2 F2 X direction 0 5 T10 T placed in edge strips Y direction 0 5 T10 T CHECKS BAR Ø SINGLY MIN MAX GLOBAL Lx > Ly
Project Spreadsheets to BS 8110 & EC2 Location 32nd floor corner panel F to G: 1 to 2 2WAY SPANNING INSITU CONCRETE SLABS to BS 8110:1997 (Table 3.14) Made by RMW Job No R68 Originated from RCC94.xls on CD © 1999 BCA for RCC Date 22Apr09 APPROXIMATE WEIGHT of REINFORCEMENT SUPPORT WIDTHS GRIDLINE 1 G 2 F (mm) WIDTH 300 300 300 300 TOP STEEL Type Dia Spacing No Length Unit wt Weight Across grid 1 T 10 @ 225 52 1850 0.617 59.3 Across grid G T 12 @ 325 24 1850 0.888 39.4 Across grid 2 T 16 @ 175 67 2025 1.578 214.1 Across grid F T 12 @ 175 45 3000 0.888 119.9 Along grid 1 T 10 @ 225 7 8100 0.617 35.0 Along grid G T 10 @ 225 7 5175 0.617 22.3 Along grid 2 T 10 @ 225 9 8100 0.617 44.9 Along grid F T 10 @ 225 13 5175 0.617 41.5 Torsion bars T 10 10 1625 0.617 10.0 BOTTOM STEEL Short span middle T 16 @ 200 45 7075 1.578 502.5 edges T 16 @ 200 14 8375 1.578 185.1 Long span middle T 12 @ 175 35 10400 0.888 323.2 edges T 12 @ 175 10 12125 0.888 107.6 SUMMARY Reinforcement density (kg/m³) 68.0 Total reinforcement in bay (kg) 1705
Disclaimer All advice or information from the British Cement Association and/or Reinforced Concrete Council is intended for those who will evaluate the significance and limitations of its contents and take responsibility for its use and application. No liability (including that for negligence) for any loss resulting from such advice or information is accepted by the BCA, RCC or their subcontractors, suppliers or advisors. Users should note that all BCA software and publications are subject to revision from time to time and should therefore ensure that they are in possession of the latest version. This spreadsheet should be used in compliance with the accompanying publication 'Spreadsheets for concrete design to BS 8110 and EC2' available from British Cement Association, Telford Avenue, Crowthorne, Berkshire RG45 Status of spreadsheet Public release version. Revision history RCC94 Twoway Slabs (Tables) Date Version Action First public release. 06Aug99RCC94 v1.0 Includes β version comments
sociation and/or ill evaluate the nsibility for its gligence) for any y the BCA, RCC or note that all BCA o time and should rsion. the accompanying nd EC2' available e, Berkshire RG45 Size (kB) 136