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ID:25818471
大小:3.70 MB
页数:151页
时间:2018-11-23
《装配式钢筋混凝土简支t型梁桥计算书》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、装配式钢筋混凝土简支T型梁桥计算书第Ⅰ部分装配式钢筋混凝土简支T型梁桥的计算资料一、设计资料1、桥面净空净—6+2×0.75人行道2、主梁跨径和全长标准跨径:=20.00m(墩中心距离)计算跨径:=19.50(支座中心距离)主梁全长:=19.96(主梁预制长度)3、设计荷载汽-20、挂-100和人群荷载3KN/㎡4、材料钢筋:主筋用Ⅱ级钢,其他用Ⅰ级钢,混凝土用25号5、计算方法:极限状态法6、结构尺寸。如图下:1517、设计依据(1)《混凝土简支梁(板)桥》人民交通出版社(第二版)(2)《公路桥涵设计通用规范》(JTJ021-85),简称“桥规”(3)《公路桥涵地基与基础设计规范
2、》(JDJ024-85)(4)《公路桥涵设计手册梁》二、主梁的计算(一)主梁的荷载横向分布系数1、跨中荷载矩横向分布系数(按G-M法)(1)主梁的抗弯及抗扭惯矩和求主梁截面的重心位置如图下:151平均板厚=1/2(8+14)=11cm=T形截面抗拒惯扭近似等于各个矩形截面的抗扭截面的抗扭惯矩之和,即:=故:单位抗弯及抗扭惯矩:(2)横梁抗弯及抗扭惯矩翼板有效宽度计算如图下:151横梁长度取为两边主梁的轴线间距,即:根据比值可查附表求得:求横梁截面重心位置横梁的抗弯和扭惯矩和:查表得,但由于连续桥面板的单宽抗扭惯矩只有独立宽扁板者的一半,可取b查表得:151单位抗弯及抗扭惯和:(3)
3、计算抗弯参数和抗弯参数—桥宽的一半—计算跨径按《公预规》取,(4)计算荷载弯矩横向分布影响线坐标已知,查图表,可得表中值:表1梁位荷载位置b0.940.971.001.031.051.031.000.970.941.051.061.071.071.020.970.930.870.831.221.181.141.071.000.930.870.800.751.411.311.201.070.970.870.790.720.671.651.421.241.070.930.840.740.680.600.830.910.991.081.131.080.990.910.831.661.51
4、1.351.231.060.880.630.390.181512.462.101.731.380.980.640.23-0.17-0.553.322.733.101.510.940.40-0.16-0.62-1.134.103.402.441.640.830.18-0.54-1.14-1.77用内插法求各梁位处值如图下:1号、5号梁2号、4号梁3号梁:(系梁位在0点的K值)列表计算各梁的横向分布影响线坐标值表2151梁号计算式荷载位置1号1.4581.3221.2081.0700.9620.8640.7800.7120.6563.4762.8642.1681.5360.9180.3
5、56-0.236-0.724-1.258-2.018-1.532-0.960-0.4660.0440.5081.0161.4361.914-0.337-0.256-0.160-0.0780.0070.0850.1700.2400.3203.1392.6082.0081.4580.9250.441-0.066-0.484-0.9380.6280.5220.4020.2920.1850.088-0.013-0.097-0.1882号1.1521.1321.1121.0701.0080.9460.8940.8280.7822.1401.8641.5781.3201.0120.7360.3
6、900.054-0.258-0.988-0.732-0.466-0.250-0.0040.2100.5040.7741.040-0.165-0.122-0.078-0.042-0.0010.0350.0840.1290.1741.9751.7421.5001.2781.0110.7710.4740.183-0.0840.3950.3480.3000.2560.2020.1540.0950.037-0.0173号0.940.971.001.031.051.031.000.970.940.830.910.991.081.131.080.990.910.830.110.060.01-0.
7、05-0.08-0.050.010.060.110.0180.0100.002-0.008-0.013-0.0080.0020.0100.0180.8480.9200.9921.0721.1171.0720.9920.9200.8480.1700.1840.1980.2140.2230.2140.1980.1840.170151各梁的横向分布系数:汽—20:挂—100:人群荷载:人行道板:2.梁端剪力横向分布系数计算(按杠杆法)汽—20:151挂—100:人群荷载:(
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