某化工廠辦公樓結構的板配筋計算案例設計資料結構布置如圖7-1所示，板為120mm厚現澆鋼筋混凝土板，10mm厚混合砂漿，樓面恒荷載標準值gk=4.33kN/m2，樓面活荷載標準值取qk=5.63kN/m圖7-1樓板結構布置圖樓面板的計算荷載設計值樓面：q=1.5×5.63kN/g=1.3×4.33kN/g+q/2=5.625kN/g+q=5.629kN/走廊：qggg彎矩計算如圖7-1，根據不同的支承情況，樓板劃分了B1、B2、B3、B4四種區(qū)格板，均按照雙向板計算。主梁b×?=300mm×600mm，次梁b×?=250mm×450mm，走道梁b×?=250mm×450mm。計算跨度：內跨：l0邊跨：l各區(qū)格板的計算跨度列于表7-1。本設計混凝土的泊松比取0.2；B1區(qū)格板：l01/l02=0.5，周邊固支時，查彎矩系數表得l01、l02m=0.0408×7.6385×m=0.0118×7.6385×mm對邊區(qū)格板的簡支邊，取m'或m表7-1樓面板的彎矩計算區(qū)格B1B2B3B4項目l3.06.153.06.15l6.03.06.153.15l0.50.50.50.51m(0.0400+0.2×0.0038)×7.6385×3.00.0038+0.2×0.0400×9.8515×5.9710.0038+0.2×0.0400×9.8515×m0.0038+0.2×0.0400×7.6385×(0.0400+0.2×0.0038)×9.8515×3.01.973(0.0400+0.2×0.0038)×9.8515×3.15m?0.0829×11.156×3.0?0.0570×14.074×3.0?8.323?0.0570×14.074×3.15m?8.3230?8.3230m?0.0570×11.156×3.0?0.0829×14.074×3.000m?5.723?10.501?5.723?0.0829×14.074×3.15截面設計截面有效高度：一類環(huán)境類別板的最小混凝土保護層厚度15mm，假定選用?10鋼筋，則l01方向跨中截面的?01=120?15?10/2=100mm，l02方向跨中截面的?截面設計用的彎矩：因樓蓋周邊有梁與板整澆，故所有區(qū)格的跨中彎矩及B1-B1支座彎矩減少20%。截面配筋計算結構及實際配筋列于表7-2。最小配筋率驗算：As/(b?)=335/(1000×120)=0.28%，此值大于0.45f（7-1）（7-2）（7-3）（7-4）表7-2樓面板截面配筋項目?(mm)M(kN·`m)A(配筋實有A(截面跨中B1區(qū)格l011005.967134.898@150335.0l02901.97349.058@150335.0B2區(qū)格l01902.44160.798@150335.0l021007.413168.308@150335.0B3區(qū)格l011005.967134.898@150335.0l02901.97349.058@150335.0B4區(qū)格l01902.6967.058@150335.0l021008.169185.888@150335.0支座B1-B11005.723129.288@150335.0B1-B21008.323189.478@150335.0B1-B31005.723129.288@150335.0B3-B41007.96181.018@150335.0B2-B210010.501240.648@150335.0B2-B410011.577266.198@150335.0繪制施工圖具體詳見施工圖。屋面板計算荷載設計值q=1.5×1.41kN/g=1.3×5.35kN/g+q/2=6.955kN/g+q=6.955kN/彎矩計算屋面板劃分B1、B2、B3、B4四種區(qū)格板，均按照雙向板計算。各區(qū)格板的計算跨度與分別算得的彎矩值列于表7-3。表7-1屋面板的彎矩計算區(qū)格B1B2B3B4項目l3.06.153.06.15l6.03.06.153.15l0.50.50.50.51m(0.0400+0.2×0.0038)×8.0525×3.01.2043.0010.0038+0.2×0.0400×8.0525×m0.0038+0.2×0.0400×8.0525×3.0011.204(0.0400+0.2×0.0038)×8.0525×3.15m?0.0829×9.110×3.0?4.673?6.797?0.0570×9.110×3.15m?6.7970?6.797?5.152m?0.0570×9.110×3.0?6.79700m?4.673?6.797?4.673?0.0829×9.110×3.15截面設計表7-2屋面板截面配筋項目?(mm)M(kN·`m)A(配筋實有A(截面跨中B1區(qū)格l011002.40167.268@150335.0l02900.96329.858@150335.0B2區(qū)格l01900.96329.858@150335.0l021002.40167.268@150335.0B3區(qū)格l011002.40167.268@150335.0l02900.96329.858@150335.0B4區(qū)格l01901.06232.948@150335.0l021003.685103.718@150335.0支座B1-B11003.738105.248@150335.0B1-B21005.438154.038@1503