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1、等截面懸鏈線混凝土箱型無鉸板拱橋設(shè)計(jì)與計(jì)算姓名:李奇輝班級(jí):2101級(jí)橋梁1班學(xué)號(hào):1001091526/26等截面懸鏈線混凝土箱型無鉸板拱橋設(shè)計(jì)與計(jì)算一、設(shè)計(jì)資料1、設(shè)計(jì)荷載：公路—Ⅰ級(jí)，人群荷載按規(guī)范取值；2、跨徑及橋?qū)挘簝艨鐝?70m，/=1/6，橋面凈寬為凈15m附22.5人行道m(xù)，全寬20m3、人行道、欄桿、路緣石及橫挑梁懸出拱圈部分，按每延米重量給定為19KN/m4、主拱圈內(nèi)橫隔板重量按順橋向每延米給定：6.0k/m5、鋼筋混凝土材料容重25，拱上填料去23二、主拱圈截面幾何要素計(jì)算1.主拱圈橫截面設(shè)計(jì)拱圈截面高度按經(jīng)驗(yàn)公式估算H=/100+△=70/100+0.8=1.8m
2、拱圈由八個(gè)各為2.0m寬的拱箱組成，全寬B=17.5m2．拱圈幾何力學(xué)性質(zhì)拱圈截面如圖1所示：圖1箱形拱截面（尺寸單位：㎝）假定拱軸系數(shù)m=2.514,/f=0.215(為拱軸線1/4拱跨處坐標(biāo)，f為計(jì)算矢高)。拱軸線拱腳處切線與水平線交角=(4914.33/10001/6)=44.505sin=0.63364,cos=0.77363箱形截面的幾何性質(zhì)：截面面積A=9㎡截面重心距底邊=1.154m截面重心距頂邊=1.8-1.154=0.6459m截面對(duì)重心軸的慣性矩I=4.087626/26截面回轉(zhuǎn)半徑i=0.4542m則：計(jì)算跨徑l=+2ybsin=100+21.1540.63364=
3、101.46m計(jì)算矢高f=+(1-cos)=100/6+(1-0.0.7736)0.6459=16.81m計(jì)算矢跨比f/l=16.81/101.46=0.16568拱軸線長(zhǎng)度==1.07554101.46=109.12m拱圈幾何性質(zhì)見表1截面號(hào)123456780116.810.6013445411.0740930641.91903315.7359118.7290310.81004813.620.6718186620.9614201521.71772512.6585815.3377320.64728910.880.7368514050.8765675081.56612310.0034312
4、.4461230.5084718.550.7947351360.8127235991.4520567.73727610.0020640.390826.570.8445797790.7647590151.366365.8052417.9363650.2919884.910.8862214380.7288246171.3021584.1811756.21215860.213.530.9200412470.7020337421.2542922.8279664.78429270.1432182.410.9467420610.6822343981.2189171.7277663.62891780.
5、0903081.520.9671503730.6678382371.1931960.8521622.71319690.0502130.840.9820765850.6576880151.1750610.1823122.015061100.0221330.370.9922126960.6509692961.163057-0.280971.533057110.0055060.090.9980802040.6471423811.15622-0.557141.24622120010.64591.154-0.64591.1543、確定拱軸系數(shù)拱軸系數(shù)按假定尺寸驗(yàn)算，先假定拱的自重壓力線在拱跨1/4
6、的縱坐標(biāo)與矢高f的比值/f.如該值與假定值0.215（m=2.514）符合，則可確定作為拱軸系數(shù)；否則，另行假定拱軸系數(shù)，直至驗(yàn)算結(jié)果與假定相符。/f可按下式求得：/f=/計(jì)算見以下說明和圖2。26/26圖2立墻布置圖（尺寸單位：m）1）立墻及以上結(jié)構(gòu)自重對(duì)1/4跨、拱腳的彎矩a）立墻位置按表1和圖2查取、計(jì)算，如表2所示。表2立墻號(hào)距拱腳(㎜)位置(截面號(hào)之間)相應(yīng)(㎜)相應(yīng)距拱腳(㎜)相應(yīng)/cos(㎜)P110500#2～#310880~85508445~12682877~813P219700#4～#56570~491016909~21136765~729P328900#6～#735
7、00~241025263~29590702~682P438100#9～#10840~37038044~42271658~651P547300#11～#1290~046498~50725647~646b)立墻處計(jì)算P1=10880-(10880-8550)/(12682-8445)(10500-8445)=9750㎜P2=6570-(6570-4910)/(21136-16909)(19700-16909)=5474㎜P3=3500-
