精品文档精品文档混凝土一、受弯构件1.受弯构件正截面1)矩形单筋(非抗震,无RE;抗震,《混规》11.1.6,RE=0.75)[a]已知M,求As.(10,,,hffyc)(对1,混凝土≤C50时取1,为C80时取0.94)《混规》6.2.10012002hbfMhhxbcRE(若0hxb,截面过小,发生超筋破坏)(518.0400550.033550bb,;对,时,对混凝土HRBHRBC))45%,2.0max(minytffminsminminsminmin1,AbhAAbhAfbxfAssycs,取取(对板(不包括悬挑板),采用400,500钢筋时,)45%,15.0max(minytff)[b]已知sA,求Mu.(10,,,hffyc)《混规》6.2.100001xhhhbfAfxbbbcsy,取REcxhbxfMu/)2(012)矩形双筋(非抗震,无RE;抗震,《混规》11.1.6,RE=0.75)[a]已知'sA,M,求As.(10,,,hffyc)(对1,混凝土≤C50时取1,为C80时取0.94)《混规》6.2.1001'0''200)]([2hbfahAfMhhxbcssyRE(抗震计算时,梁端截面在一级时025.0hx,在二、三级时035.0hx)14.2.6)(22''''1',《混规》ssyREsysycsaahfMAafAfbxfAax)45%,2.0max(minytffminssminminsssAAAAbhA,取,取(对板(不包括悬挑板),采用400,500钢筋时,)45%,15.0max(minytff)精品文档精品文档[b]已知sA、'sA,求Mu.(10,,,hffyc)《混规》6.2.100001''xhhhbfAfAfxbbbcsysy,取(抗震计算时,梁端截面在一级时025.0hx,在二、三级时035.0hx)14.2.6/)(2/)]()2([2'''0''01',《混规》REsssyREssycaahAfMuaahAfxhbxfMuax3)T形单筋(非抗震,无RE;抗震,《混规》11.1.6,RE=0.75)[a]已知M,求As.(10,,,hffyc)(对1,混凝土≤C50时取1,为C80时取0.94)混规6.2.11:,b,)2(f'0''1形截面计算,如下按矩形计算按宽度为’TMMhhhbfREREfffc)2()('0''11fffchhhbbfM011200)(2hbfMMhhxbcREyffcsfhbbbxfA])([''1)45%,2.0max(minytffminssminminsssAAAAbhA,取,取[b]已知sA,求Mu.(10,,,hffyc)《混规》6.2.11形截面计算,如下:,按矩形计算,按宽度为TAfAfhbfsysyffc'f''1b0001''1x,)(hhhbfhbbffxbbbcffcy取REfffccuhhhbbfxhbxfM/)]2()()2(['0''1012.受弯构件斜截面精品文档精品文档1)非抗震已知V,求箍筋.),,f,(0hffyvtc)360f360f(yvyv时,取当混规6.3.1满足要求,满足要求,VbhVbhbhccw0c0cf20.06f25.04175.1),0.3~5.1(ha%757.00cvcv,)下独立梁集中荷载(一般受弯构件4.3.6,9.2.97.3.6,0《混规》构造配筋;按《混规》《混规》VlVbhftcv00hfbhfVsAyvtcvsv取sAsnAsvsv1且满足构造要求min1svsvbsnA2)抗震(《混规》11.1.6,RE=0.85)已知V,求箍筋.),,f,(0hffyvtc)360f360f(yvyv时,取当满足要求满足要求,《混规》,/f15.05.2,/f20.05.23.3.110c0cVbhVbhhlREcREcn175.1),0.3~5.1(ha%757.00cvcv)下独立梁集中荷载(一般受弯构件006.04.3.11hfbhfVsAyvtcvREsv《混规》取sAsnAsvsv1且满足构造要求min1svsvbsnA精品文档精品文档3.梁筋构造1)纵筋构造非抗震抗震最大配筋率——《混规》11.3.7,《抗规》6.3.4-1梁端受拉钢筋不宜大于2.5%最小配筋率《混规》表8.5.1)/45%,2.0max(ytff《混规》表11.3.6-1)/80~45%,4.0~%2.0max(ytff直径《混规》9.2.1-2h≥300,d≥10;h300,d≥8;a.通长筋:《混规》11.3.7;《抗规》6.3.4-1;一、二级d≥14且As≥Asmax/4;三、四级d≥12;b.贯通中柱筋:《混规》11.6.7:9度框架和一级框架结构d≤B/25;一、二、三级d≤B/20;《抗规》6.3.4:一、二、三级d≤B/20;其他构造间距:《混规》9.2.1-3:A.顶筋≥max(30;1.5d)B.底筋及各层≥max(25;d)C.底部两层以上钢筋中距增大一倍A.压区高度:《混规》11.3.1:《抗规》6.3.3-1梁端一级025.0hx;二、三级035.0hxB.纵筋面积:《混规》11.3.6-2:《抗规》6.3.3-2梁端底面/顶面一级≥0.5;二、三级≥0.32)箍筋构造非抗震抗震面积配筋率《混规》9.2.9-3yvtff/24.0《混规》11.3.9:一级yvtff/30.0;二级yvtff/28.0;三、四级yvtff/26.0加密区长度——《混规》表11.3.6-2;《抗规》表6.3.3最大间距《混规》表9.2.9《混规》表11.3.6-2;《抗规》表6.3.3最小直径《混规》9.2.9-2:A.h800,d≥8;h800,d≥6;B.有计算需要的压筋时,d≥D/4A.《混规》表11.3.6-2;《抗规》表6.3.3B.梁端受拉钢筋配筋率2%,最小直径+2肢距——《混规》表11.3.8;《抗规》表6.3.4:一级≤max(200;20d);二、三级≤max(250;20d);四级≤300精品文档精品文档二、偏压、偏拉构件1、偏压、偏拉构件正截面1)偏压正截面对称配筋(非抗震,无RE;抗震,《混规》11.1.6,查RE)(75.015.0/REcAfN;;80.015.0/REcAfN;)【a】已知N,M,求As(10,,,hffyc)NMe0(M需按《混规》6.2.4考虑二阶效应))30/,20max(heaaieee0aheei2,《混规》6.2.17,001'0120101b001))((43.0f-,x,hxbhfahbhfNebhNhhbfNxbcsbccbbcRE,小偏压,按计算大偏压,取此14.2.6)-h(22)()2/(2''''''''001'',《混规》,ssyREsssisycREssaafNeAAaheeaahfxhbxfNeAAaxminbh全全全A且满足构造要求一侧一侧一侧minbhA【b】已知N,As求M.(10,,,hffyc)《混规》6.2.17,001'0120101b001))((43.0f-,x,hxbhfahbhfNebhNhhbfNxbcsbccbbcRE,小偏压,按计算大偏压,取此''''''0'01'214.2.6)(22e)()2/(2siREsssysiREssycaheeNaahAfeaaheNahAfxhbxfeax,《混规》aieee00NeM(M需按《混规》6.2.4考虑二阶效应)精品文档精品文档2)偏压正截面对称配筋(非抗震,无RE;抗震,《混规》11.1.6,85.0RE)【a】已知N,M,求As('0,hfy)NMe0sahee20'《混规》6.2.23,)('0''syREssahfNeAA)45%,2.0max(minytffminsminmin,,ssssAAAAbhA取取【a】已知N,As,求M('0,hfy)《混规》6.2.23,NahAfeREssy)('0'sahee2'00NeM(M需按《混规》6.2.4考虑二阶效应)2.偏压、偏拉构件斜截面1)偏压斜截面【a】非抗震已知V,求箍筋.),,f,(0hffyvtc)360f360f(yvyv时,取当混规6.3.1满足要求,满足要求,VbhVbhbhccw0c0cf20.06f25.04)0.3~5.1(/%755.1)0.3~0.1(2/)(00n0hahHVhM);集中荷载(载其他偏压构件,均布荷点在层高范围内框架结构框架柱,反弯ANNNAfccf3.03.0取12.3.6,13.3.6,07.075.10《混规》构造配筋《混规》VVNbhft且满足构造要求取ssnA07.0175.1sv100SVyvtsvAhfNbhfVsA【b】抗震已知V,求箍),,f,(0hffyvtc)360f360f(yvyv时,取当)85.06.1.11(RE,《混规》)0.3~0.1(2/)/(0n0hHVhM点在层高范围内框架柱和框支柱,反弯精品文档精品文档《混规》11.4.6满足要求框架柱和框支柱满足要求框架柱VbhVbhREcREc/f15.02/f20.020c0cAfNNNAfcc3.03.0取00sv056.0105.1s7.4.11hfNbhfVAyvtRE《混规》取且满足构造要求sAsnAsvsv12)偏压斜截面【a】非抗震已知V,求箍筋.),,f,(0hffyvtc)360f360f(yvyv时,取当混规6.3.1满足要求,满足要求,VbhVbhbhccw0c0cf20.06f25.04)0.3~5.1(/%755.1)0.3~0.1(2/)(00n0hahHVhM);集中荷载(载其他偏压构件,均布荷点在层高范围内框架结构框架柱,反弯0002.0175.114.3.60取《混规》Nbhft00036.02.0175.1bhfNbhfVhsAfttsvyv002.0175.1hfNbhfVsAyvtsv且满足构造要求取sAsAsv1svn【b】抗震已知V,求箍),,f,(0hffyvtc)360f360f(yvyv时,取当)85.06.1.11(RE,《混规》)0.3~0.1(2/)/(0n0hHVhM点在层高范围内框架柱和框支柱,反弯《混规》11.4.6满足要求框架柱和框支柱满足要求框架柱VbhVbhREcREc/f15.02/f20.020c0c0002.0105.18.4.110取《混规》Nbhft精品文档精品文档00036.02.0105.1bhfNbhfVhsAfttREcsvyv002.0105.1hfNbhfVsAyvtREcsv且满足构造要求取sAsAs