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1、板、柱、梁鋼筋工程計(jì)算【例1】計(jì)算鋼筋混凝土板的鋼筋用量?!冀狻?.計(jì)算鋼筋長(zhǎng)度,現(xiàn)澆板砼強(qiáng)度等級(jí)C25,保護(hù)層厚度C=20mm。(1)沿長(zhǎng)方向鋼筋ф8@200①單根鋼筋長(zhǎng)?1=1.3+1.76-2×0.02+2×6.25×0.008=3.12(m)②根數(shù)N1=(2.5-0.24-0.1)÷0.2+1=12(根)③鋼筋長(zhǎng)L1=?1N1=3.12×12=37.44(m)(2)沿短方向鋼筋ф8@200?2=2.5+0.24-0.02×2+2×6.25×0.008=2.8(m)N1=(1.3+1.76-3×0.12-0
2、.1×2)÷0.2+2=15(根)L2=2.8×15=42(m)(3)負(fù)彎矩筋ф6負(fù)筋長(zhǎng)度=圖示平直部分長(zhǎng)度+2(板厚-2C-1.75d)①左右兩邊負(fù)筋長(zhǎng)度單根長(zhǎng)?3=0.4+0.12-0.02+2(0.08-2×0.02-1.75×0.006)=0.56(m)根數(shù)N3=〔(2.5-0.24-0.1)÷0.2+1〕×2=24(根)總長(zhǎng)L3=0.56×24=13.44(m)②上下兩邊(沿外墻)負(fù)筋長(zhǎng)度單根長(zhǎng)?4=0.4+0.24-0.02+2×(0.08-2×0.02-1.75×0.006)=0.68(m)根數(shù)N4
3、=〔(1.3+1.76-3×0.12-0.1×2)÷0.2+2〕×2=15(根)×2=30(根)總長(zhǎng)L4=0.68×30=20.4(m)③中間小肋梁(2’–2’斷面)負(fù)筋長(zhǎng)度單根長(zhǎng)?5=0.4×2+0.12+2(0.08-2×0.02-1.75×0.006)=0.98(m)根數(shù)N5=(2.5-0.24-0.1)÷0.2+1=12(根)總長(zhǎng)L5=0.98×12=11.76(m)④按需要,對(duì)負(fù)筋增設(shè)發(fā)布筋ф6@400總長(zhǎng)度L6=(2.5-0.24)×7+(1.3+1.76-0.24)×4=27.1(m)(4)斷面2–
4、2肋梁①4ф14鋼筋總長(zhǎng)L7=(3.06-0.02×2+2×6.25×0.014)×4=12.78(m)②箍筋ф6@200?8=0.24×4-8×0.03+18×0.006=0.828(m)N8=(3.06-3×0.12-2×0.1)÷0.2+2=15(根)總長(zhǎng)L8=0.828×15=12.42(m)(5)斷面2’–2’肋梁(120㎜×240㎜)①4ф12鋼筋總長(zhǎng)L9=(2.5+0.24-0.02×2+6.25×2×0.012)×4=11.4(m)②箍筋ф6@200?10=(0.12+0.24)×2-8×0.03
5、+18×0.006=0.588(m)N10=(2.5-0.24-2×0.05)÷0.2+1=12(根)L10=0.588×12=7.06(m)2.鋼筋消耗量規(guī)格ф6ф8ф12ф14代號(hào)L3、L4、L5、L6、L8、L10L1、L2L9L7長(zhǎng)度(m)13.44+20.4+11.76+27.1+12.42+7.06=92.1837.44+42=79.4411.412.78質(zhì)量(kg)92.18×0.222=20.4679.44×0.395=31.3811.4×0.888=10.1212.78×1.208=15.44【
6、例2】圖為某三層現(xiàn)澆框架柱(砼C25)立面和斷面配筋圖,底層柱斷面尺寸為350×350,縱向受力鋼筋4ф22(螺紋鋼),受力鋼筋下端與柱基插筋搭接,搭接長(zhǎng)度800mm。與柱正交的是“+”形整體現(xiàn)澆梁,試計(jì)算該柱鋼筋工程量?!冀狻?.計(jì)算鋼筋長(zhǎng)度(C=30mm)(1)底層縱向受力筋Ф22(Ⅱ級(jí)鋼筋)①每根筋長(zhǎng)l1=3.07+0.5+0.8=4.37(m)②總長(zhǎng)L1=4.37×4=17.48(m)(2)二層縱向受力筋Φ22(Ⅱ級(jí)鋼筋)①每根筋長(zhǎng)l2=3.2+0.6=3.8(m)②總長(zhǎng)L2=3.8×4=15.2(m)(
7、3)三層縱筋Φ16(Ⅱ級(jí)鋼筋)①每根筋長(zhǎng)l3=3.2-0.03=3.17(m)②總長(zhǎng)L3=3.17×4=12.68(m)(4)柱基插筋Φ22(Ⅱ級(jí)鋼筋)①每根筋長(zhǎng)l4=0.8+1.5+0.2-0.04=2.46(m)②總長(zhǎng)L4=2.46×4=9.84(m)(5)箍筋Ф6,按03G101-1,考慮135o彎鉤①二層樓面以下,單根箍筋長(zhǎng)lg1=0.35×4-8×0.03+18×0.006=1.268(m)箍筋根數(shù)Ng1=0.8/0.1+1+(3.07-0.8+0.5)/0.2=9+14=23(根)總長(zhǎng)Lg1=1.26
8、8×23=29.16(m)②二層樓面至三層樓頂面,單根箍筋長(zhǎng)lg2=0.25×4-8×0.03+18×0.006=0.868(m)箍筋根數(shù)Ng2=(0.8+0.6)÷0.1+(3.2×2-0.8-0.6-0.03)÷0.2=14+25=39(根)總長(zhǎng)Lg2=0.868×39=33.85(m)箍筋總長(zhǎng)度Lg=Lg1+Lg2=29.16+33.85=63.01(m)2.鋼筋圖