混凝土结构设计原理习题及参考答案1第13章单层厂房结构设计习题参考答案§13.1某单层单跨厂房,跨度18m,柱距6m,内有两台10t中级载荷状态的吊车,试求该柱承受的吊车竖向荷载Dmin、Dmax和横向水平荷载Tmax。起重机有关数据如下:吊车跨度LK=16.5m,吊车宽B=5.44m,轮距K=4.4m,吊车总质量18.23t,额定起重量10t,最大轮压标准值Pmax,k=104.7KN。解:kNPgQmPgQmmPkkk45.367.104102)1023.18(2)(2)(max,max,21min,查表,9.0,竖向反力影响线如图所示:则有:kNyPrDikQ47.288)696.46.156.01(7.1044.19.0max,maxkNPPDDkk4.1007.10445.3647.288max,min,maxminkNgQmTk69.310)10684.3(9.012.041)(412kNPTDTkk17.107.10469.347.288max,maxmax§13.2试用剪力分配法求图所示排架,在风荷载作用下各柱的内力。已知基本风压20/45.0mkN,15m高处的14.1z(10m高0.1z),体形系数s示于图中。柱截面惯性距:.105.19,102.7,1038.14,1013.2494493492491mmImmImmImmI上柱高3m,计算单元宽度取B=6m。1.6/60.56/64.96/614.4m4.4m5.44m5.44m6m6m混凝土结构设计原理习题及参考答案2解:1.求21,qq线性差值:014.1)105.10(10150.114.11zmkNBqmkNBqzskzsk/37.1645.0014.15.0/19.2645.0014.18.00201)(/92.137.14.1)(/07.319.24.12211mkNqrqmkNqrqkQkQ2.求W高度取10.5+2.1=12.6m07.1)106.12(10150.114.11zKNBhhWzk54.7645.007.1]2.11.01.23.1[])6.05.0()5.08.0[(021kNWrWkQ56.1054.74.13.计算参数n,A柱:29.05.10315.01038.141013.29921HHIInuB柱:29.05.10337.0105.19102.79943HHIInu4.在柱顶虚拟加不动铰支座查表计算:风向-0.6-0.5Wq1q2+0.8-0.5I1I2I3I41.2m2.1m10.5m混凝土结构设计原理习题及参考答案3A柱:34.0)]115.01(29.01[8)]115.01(29.01[3)]11(1[8)]11(1[3343411nnCB柱:36.0)]137.01(29.01[8)]137.01(29.01[3)]11(1[8)]11(1[3343411nnC)(3.736.05.1092.1)(1134.05.1007.3112111HCqRHCqRBA故:柱顶剪力)(3.7)(111,1,BBAARVRV5.撤消不动铰支座,反向施加支座反力。A柱:64.2)115.01(29.013)11(13330nCB柱:88.2)137.01(29.013)11(13330nC于是:64.21038.145.109303clcAECIEHu88.2105.195.109303clcBECIEHu所以分配系数:6.05.1988.238.1464.25.1988.24.05.1988.238.1464.238.1464.2BA故,柱顶剪力:)(32.17)56.103.711(6.0)()(54.11)56.103.711(4.0)(2,2,kNWRRVkNWRRVBABBBAAA6.叠加两个受力状态混凝土结构设计原理习题及参考答案4)(02.103.732.17)(54.01154.112,1,2,1,BBBAAAVVVVVV7.绘制弯矩图§13.3如图所示排架,在A,B牛腿顶面作用有力矩M1和M2。试求A,B柱的内力,已知:M1=153.2KN.M,M2=131.0KN.M,柱截面惯性距同上习题13-2。解:1.计算参数n,A柱:29.05.10315.01038.141013.29921HHIInuB柱:29.05.10337.0105.19102.79943HHIInu2.在柱顶虚拟加不动铰支座A柱:21.1)115.01(29.0129.015.1)11(115.132323nCB柱:32.1)137.01(29.0129.015.1)11(115.132323nCM1M2I1I2I3I417515.44q1=3.07KN/m0.54KNA柱M图(KN·m)211.0538.7q1=1.92KN/m10.02KNB柱M图(KN·m)混凝土结构设计原理习题及参考答案5故:)(47.1632.15.100.131)(65.1721.15.102.1533231kNCHMRkNCHMRBA3.撤消不动铰支座,反向施加支座反力)(18.147.1665.17kNRRRBA6.0,4.0BA所以:)(71.06.018.1)(47.04.018.1kNRVkNRVBBAA3.叠加内力)(18.1771.047.16)(18.1747.065.17BAVV4.弯矩图:§13.4如图所示柱牛腿,已知竖向力设计值kNFv324,水平拉力设计值kNFh78,采用C20(2/54.1mmNftk)混凝土和HRB335级钢筋,试设计牛腿的纵向受力钢筋。(截面宽度b=400mm(另加的条件))17.18KNM=153.2KN.m51.54101.6627.19M图(KN.M)A柱17.18KNM=131KN.m51.5479.4649.39M图(KN.M)B柱混凝土结构设计原理习题及参考答案6解:1.验算截面尺寸mmh760408000kNFkNhabhfFFvstkvshs3243977602505.076040054.1)324785.01(8.05.0)5.01(00截面尺寸满足要求。2.计算纵向受拉钢筋233073030010782.176030085.0250103242.185.0mmfFhfaFAyhyvs选配418,21017mmAs%2.0%32.08004001017bhAs满足最小配筋要求。§13.5某单层厂房现浇柱下独立锥形扩展基础,已知由柱传来基础顶面的内力:N=920KN,M=276KN.M,V=25KN,柱截面尺寸mmmmhb600400,地基承载力2/200mkNfa,基础埋深1.5m,基础采用C20混凝土,HPB235级钢筋,试设计此基础并绘制基础平面图,剖面和配筋图。解:Fh=78KNFV=324KN1050500C1=250450400400800混凝土结构设计原理习题及参考答案71.初步确定基础高度和杯口尺寸取插入深度:mmh6001,故,杯口深度为mm65050600;杯口顶面尺寸:宽为mm550275400,长为mm750275600;杯壁厚度取为mmt200;杯底厚度取为mma2001;其他截面尺寸:mmh3002;mma2002;所以,初步确定基础的高度为mm850200506002.确定基础底面积241.55.120200920mdrfFAma增加20%~40%,初步选定尺寸为:mlmB2,5.3;27mA3221.465.326mlbWkNbldrGm2105.125.3202max/2341.485.0252765.32210920mkNWhVMblGFPcc2min/9.881.485.0252765.32210920mkNWhVMblGFPcc(1)22max/2402.1/234mkNfmkNPa(2)2minmax/2004.16129.882342mkNfPPa300350200Lb9501150600400b混凝土结构设计原理习题及参考答案8故,基础底面尺寸满足要求。3.验算基础高度地基净反力的计算。2min,2max,/9.581.485.0252765.32920/9.2031.485.0252765.32920mkNWhVMblFPmkNWhVMblFPccnccn仅需对台阶下基础做冲切验算:mmh510405500冲切面:mmbmmbbt197051029509502752400mbbbbtm46.12冲切荷载计算面积:2220033.1])51.0295.022()51.0215.125.3[(])22()22[(mlhbllhhbAttkNAPApFnsl2.27133.19.203max,kNAPApFnsl2.27133.19.203max,kNFkNhbflmt2.2713.57351046.11.17.07.00故,基础高度满足抗冲切承载力的要求。4.基础板底配筋(1)长边方向mkNblhbPPMccnn268)4.022()6.05.3)(28.1439.203(241)2())(2(241221max,1mmh8104085001131.4155.2178143.817503003502001750203.958.9Pn(KN/m2)混凝土结构设计原理习题及参考答案926011117518102109.0102689.0mmhfMAys选用1214,14@150变阶处:mkNMmkNblhbPPMccnn5.2685.204)95.022()15.15.3)(22.1559.203(241)2())(2(2411221max,'1(2)短边方向mkNhbblPPMccnn5.106)6.05.32()4.02)(29.589.203(241)2())(2(24122min,max,2mmh7961440850022602227087962109.0105.1069.0mmhfMAys选配10@200