装配式钢筋混凝土简支T梁桥-算例(新规范).doc
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5、nd is to continuously improve the quality and standard of political, conscientiously study Deng Xiaoping theory and three represents important thought and the scientific Outlook on development, implement the partys basic program for the primary stage of socialism, adhere to the correct political ori
6、entation, maintain highly consistent with the CPC Central Committee, is good at theories of socialism with Chinese characteristics to analyze and solve problems. Third, strengthening the party spirit and the world transformation, perseverance of the party Constitution, relive Party vows to establish
7、 correct world Outlook, Outlook on life and the world, practically embodies ideals and beliefs into action, combine lofty ideals and practical activities, transforming the objective world, actively participate in the great practice of building socialism with Chinese characteristics. 2, keep the purp
8、ose in concept, changing the style of work. First, keep in mind that the purpose of serving, adhere to assuming power for the people, keep in mind the people and care about people, and the joys and sorrows of the masses, .According to city discipline, and municipal organization Department requiremen
9、ts, today we held implement implementation independent Commission against corruption guidelines effective strengthening led cadres style construction topic democratic life, main task is close contact thought, and work actual, control check district Standing Committee team and the personal in impleme
10、ntation independent Commission against corruption guidelines Shang exists of problem, in-depth carried out criticism and self-critical, further clear rectification direction and measures, effective enhanced clean politics of consciousness and initiative, firm set good of ruling image. Before the mee
11、ting, the way we take surveys solicited a views, combed, related to team building装配式钢筋混凝土简支T型梁桥计算示例一、设计资料1桥面净空二级公路,设计时速60,车道宽度为33.5+20.752主梁路径和全长标准路径:20.00 (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设计荷载公路级,人群荷载为34材料钢筋:主筋用级钢,其他用I级钢;混凝土:。5计算方法极限状态设计法6结构尺寸参考原有标准图尺寸,选用如图l所示,其中横梁用五根。7设计依据(1)公路桥涵设计
12、通甩规范(JTG D602004),简称“桥规”;(2)公路钢筋混凝土及预应力混凝土桥涵设计规范(JTG D642004),简称“公预规”;二、主梁的计算(一)主梁的荷载横向分布系数1跨中荷载弯矩横向分布系数(按GM法)图1(尺寸单位:cm)图2 (尺寸单位:cm)(1)主梁的抗弯及抗扭惯矩和求主梁截面的重心位置(图2):平均板厚 T形截面抗扭惯矩近似等于各个矩形截面的抗扭惯矩之和,即:式中: 为矩形截面抗任刚度系数(查表);、为相应各矩形的宽度与厚度。查表可知:,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(图3):横梁长度取为两边主梁的轴线间距,即:,图3根据比值可查
13、教材【表2-1】求得0.548所以0.548C=0.5482.35=1.29m求横梁截面重心位置横梁的抗弯和抗扭惯矩和:=2h2,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c故=图5按桥规规定:汽车荷载距人行道边缘距离不小于0.5m,人群荷载取3kNm,人行道板以12kN集中竖向力作用在一块板上。各梁的横向分布系数:汽车荷载: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)汽车荷载:人群荷载:;图6 (尺寸单位:cm)(二)内力计算1恒载内力(1)恒载:假定桥面构造各部分重量平均分配给各土梁承担,计算见【表3】。一侧人行道部分每2.5长时重12.42,1.0
14、长时重。按人行道板横向分布系数分摊至各梁的板重为:1号(5号)梁: 2号(4号)梁: 3号梁: 各梁的恒载汇总于【表4】。(单位:) 【表4】 梁号主梁横梁栏杆及人行道铺装层合计1(5)9.760.632.184.2016.772(4)9.761.261.874.2017.0939.761.261.684.2016.99(2)恒载内力计算影响线面积计算见【表5】。【表5】 恒载内力计算见【表6】。【表6】梁号qqq1(5)16.7747.53797.0816.7735.65597.8516.779.75163.512(4)17.0947.53812.2917.0935.65609.2617.0
15、99.75166.63316.9047.53803.2616.9035.65602.4916.909.75164.782活载内力计算(1)汽车冲击系数 (计算略)(2)作用值计算车道荷载为公路级,根据桥规4.3.14条规定:(计算跨径为19.5,故值需进行内插计算)计算剪力效应时:人群荷载为(3)活载弯矩计算影响线面积计算(见【表7】):影响线面积计算 【表7】 项目影响线顶点位置计算式处47.53处35.65支点处9.75处2.438汽车荷载产生的弯矩计算(见【表8】):【注】按照横向分布系数在纵桥向的分布规律,弯矩计算时全桥跨取跨中横向分布系数。汽车荷载产生的弯矩 【表8】 梁号内力内力值
16、(1)(2)(3)(4)(5)(6)(1)(2)(3)(5)+(4)(6)10.5040.5041.1911.1917.8757.875178.5178.547.5335.654.8753.656747.02560.2520.4550.4551.1911.1917.8757.875178.5178.547.5335.654.8753.656674.39505.7830.4090.4091.1911.1917.8757.875178.5178.547.5335.654.8753.656606.21454.65人群荷载产生的弯矩计算(见【表9】):人群荷载产生的弯矩 【表9】 梁号内力内力值(1)
17、(2)(3)(1)(2)(3)10.6200.6202.252.2547.5335.6566.3049.7320.3910.3912.252.2547.5335.6541.8131.3630.3420.3422.252.2547.5335.6536.5727.43(4)活载剪力计算汽车荷载产生的剪力计算:跨中剪力计算:支点剪力计算:汽车荷载产生的跨中剪力计算见【表10】:汽车荷载产生的跨中剪力计算 【表10】 梁号内力内力值(1)(2)(3)(4)(5)(6)(1)(2)(3)(5)+(4)(6)10.5041.1917.875214.22.4380.575.820.4551.1917.875
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