箱涵设计计算书.doc

公路桥涵设计计算书一,设计资料公路上箱涵,,,,顶为300mm沥青混凝土路面铺装层,两侧边为砂砾石夯填,土的内o3,箱涵选用C25混凝土和HRB335,砂砾石密度γ=23KN/m摩擦角?为40钢筋。本设计安全等级为二级,荷载为公路-Ⅱ级。二设计计算(一)截面尺寸顶板、底板厚度δ=40cm(C1=30cm)侧墙厚度t=40cm(C2=30cm)故横梁计算跨径L=L+t=+==h0+δ=+=(二)???m/.H?0KN??P5621恒载水平压力顶板处0??40220???mKN/10.?00Htane?45???1p12??底板处0??40220???m/.01KN29?45)e?(?Hhtan???1p23??,公路-Ⅱ级车辆荷载由《公路桥涵设计通用规范》。角向下分布。,按(JTGD60-2004)?01.?Htan3045??4501.?Htan30m???0m故,横向分布宽度为a029?.3?4tan?.?2?1??2??同理,纵向,:?.30255?1???0?2??Htan30b?故,??2??∑G=140KN车辆荷载垂直压力?G1402mKN/25???????04220??m/??q车tanKN45??e??车2??(三)??K?)1种荷载作用下(图a)1(.涵洞四角节点弯矩:??2lP1P?MM?M??M??=-?112横梁内法向力N?N?0,2a1a侧墙内法向力??lPP=?N?N4a3a2p?q2车辆荷载(=)车??2lP1PM?mM?M?MKN??????aDaAaBaC121K???lPPN2219?.?N?N43aa2(2)b种荷载作用下(图2)2图2PhKpmKN?????M?M?M?M?bDbBbAbC12?1KPhp??N?KN,21bb20?N?N4b3b2)(P=ep1=(3)c种荷载作用下图??2Ph8K?3KpmKN???M?M???cDcA603KK?1???2Ph72KK?pm43KNM?M?????4.????cCcB60?1?3KKPhM?MpcBcA=?N?1ch6pPhM?MpcBcA=??2ch3pN?N?3P?e?e??10?)恒载(1p2p种荷载作用下d)4(.??2Ph??2?3?10KKKp=m?KN??????????dA24515K?3K?4K?6????2Ph??35KK?K?3pmMKN??????????dB2515K4?36K?4K?????2Ph??35KKK?3?pm?.02KN?????4M?????dC24?15K53??4K6K????2Ph??23?10KK?KpmKN??M????????dA254?15K3K6?4K???M?MdCdDKNN54???MdCdDN?ph???MdCdBN25KN??N??2??.4d3dLP??2m/.88KN2?pe?车辆荷载车(5)节点弯矩和轴力计算汇总表按《公路桥涵设计通用规范》(JTGD60——2004)(kNm)·N(kN)MAMBMCMDN1N2N3N4恒载a----×∑土的结构、重力------------×∑土侧压力-----------×∑汽车-----37.