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1.工程概况及设计资料某柱下条形基础,所受外荷载大小及位置如图1.1所示。柱采用C40混凝土,截面尺寸800800mmmm。地基为均质粘性土,地基承载力特征值160akafKP,土的重度319/KNm。地基基础等级:乙级。地下防水等级:二级。图1.12.基础宽度计算基础埋深定为2m。总竖向荷载值1000180014004000kiNKNKNKNKN18006100010.55.334000NKNmKNmemKN假设两端向外延伸总长度为3m,则4.56313.5Lmmmm地基底面以上土的加权重度319/mKNm查得《地基规范》中对于粘性土:1.6d,0.3b持力层经深度修正后的地基承载力特征值3(0.5)1601.619/(20.5)205.6aakdmaaffdmKPKNmmmKP340001.789205.620/2.013.5kiaGaNKNbmfdlKPKNmmm取2.0bm3.两端外伸长度验算即地基承载力验算320/2.013.52.01044kGKNmmmmKN400010445044kikNGKNKNKN80kiMKNm800.0155244NGKNmemKN113.55.4451.3052lmm213.55.0551.6952lmm5244194.22205.62.013.5kikkaaaNGKNpKPfKPblmm,max,min6195.581.2246.7524460.015(1)(1)2.013.513.5192.860kikkNGaaakaNGpeKPfKPKNpbllmmKP图1.24.计算基础内力(倒梁法)(1)求基地净反力基础高度定为1.5m,1.516.04ihl,满足要求。基地净反力设计值40001.3540013.5KNqKNmm图1.3(2)求连续梁弯矩采用力矩分配法求弯矩。对于杆AB,BC相当于一端铰支,一端固定。34.50.571334.56360.429334.56BABAETETETETETET2'22'211.305400341213411004.54007928211.695400575215751006400146382LAFBALCFBCMKNmMKNmMKNmMKNm力矩调整表:ABC0.5710.429341-441792-1463675-575336336341-44111281128675-5751128800.5711174BAMKNm1128800.4291094BCMKNm221(1.3054.5)4001001174212154.51(1.6956)400100109421775640013.5(12151775)2410ACCFKNFKNFKN(3)支座反力与对应柱的轴向力校核即计算弯矩的调整A轴柱:900100010%1000AB轴柱:178518001%1800BC轴柱:1347140010%1400C误差小于20%,所以不必调整图1.4(4)由弯矩图可得剪力图图1.5(5)求跨中最大弯矩2(1.6952.743)2.7431775400/9302BCmmMKNKNmKNm2(10.463)8.76817752.7682410400/3392ABmMmKNmKNKNmKNm图1.6(6)修正边跨跨中及第一内支座弯矩1.2339407ABMKNmKNm1.29301116BCMKNmKNm1.2441529AMKNmKNm1.211741409BMKNmKNm1.2675810CMKNmKNm5.配筋计算选用材料:混凝土采用C40(cf=19.12/Nmm,tf=1.712/Nmm)钢筋所有钢筋均采用HRB335(yf=3002/Nmm)级钢筋;(1)正截面抗弯计算梁高1500hmm最小保护层厚度60cmm,80samm则有效截面高度015001601340hmmmmmm翼缘厚'350fhmm判别T形截面类型:按第一类T形截面试算。跨内截面'00.045/350/13400.261fhhmmmm,故各跨内截面均属于第一类T形截面。截面ABCABBC/()MkNm52914098104071116'210scfMfbh210()scMfbh0.0170.0450.0260.0060.016112s0.0170.0470.0260.0060.016'f01/scyAbhff01(/)scyAbhff2/mm13273608199610232776选配钢筋5286285285285282mm实配钢筋面积注:'222210222210'22012011.019.1/20001340685921.019.1/900134030866/200013401.019.1/300/170627/90013401.019.1/300/7cfcfcycyfbhNmmmmmmkNmfbhNmmmmmmkNmbhffmmmmNmmNmmmmbhffmmmmNmmNmm22min67820.002570.0025790013403099smmAbhmmmmmm(2)斜截面抗剪计算截面ABC左右左右左右/VkN-522693-11071303-1097678b/2VVqkN边中-354525-9391135-92951000.25/ccfbhkN5759v00.7/tfbhkN1444v选用箍筋61421/svsvAnAmm923001.250.7yvsvtfAhSVfbh按构造配筋实配箍筋间距s/mm300注:2020b0.4420/16820.250.251.019.1/900134057590.70.71.71/90013401444/cctqmkNmkNfbhkNmmmmmmkNfbhNmmmmmmkN(3)底板抗弯计算基底反力设计值4002002.0jaaPKPKP计算截面弯矩设计值:2112000.555522jMPlKNmKNm截面有效高度035065285shhammmmmm6221055100.035100028519.1scMfbh1120.035s22010.035100028519.1/635300scyAbhffmmmm取20@200,22210003142093635150sAmmmmmm(4)腹板构造腰筋单侧构造钢筋截面面积不小于腹板面积wbh的0.1%,间距不宜大于200mm,在1150mm范围内按5层布置其中900bmm,15003501150whmmmm210.00190011502075sAmm取118,22254.5207sAmmmm(5)分布筋布置按照规范取310@160
本文标题:柱下条形基础计算书2016年
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