【高铁跨河混凝土桥桥梁结构荷载计算2700字】

VII1.3温差次力计算桥梁结构处于自然状态，桥跨主要承受均匀温度作用和梯度温度作用，这里只考虑梯度温度作用。桥面铺装竖向温差计算的温差基数如下：℃（3-25）℃（3-26）T3=4.30℃T4=2.15℃T5=0℃温差应力计算公式（3-27），（3-28）按图3-3-1计算：℃℃℃℃e1=1.65me2=1.55me3=1.45me4=1.35mα=0.00001/℃=1.60×104(Mpa)=17727.67kNMtº=-28041.24kN·m由Mtº产生的二次矩Mt'可用力法求得3-4温度次内力计算图（3-29）（3-30）（3-31）(3-32)（3-33）解得：温度次内力：（3-34）;（3-35）表3-6温度作用弯矩和剪力效应截面弯矩（kN·m）剪力（kN）左支点01022.75边跨1/415341.251022.75边跨1/230682.511022.75边跨3/446201.761022.75左中支点（左）61365.011022.75左中支点（右）61365.010中跨1/461365.010中跨1/261365.0101.4基础沉降内力计算1.4.1取左支座沉降计算基础的沉降内力图3-5边支座基础沉降图示图3-6基础沉降次内力计算图力法方程：（3-36）（3-37）（3-38）（3-39）（3-40）X1=-9611.23X2=2401.311.4.2取左中支座沉降1cm计算基础的沉降内力（3-41）（3-42）（3-43）（3-44）（3-45）（3-46）X1=20145.34X2=-13052.67图3-4-2基础沉降次内力计算图基础沉降内力计算公式：（3-47）表3-7左边、左中支座沉降效应截面左边支座沉降次内力右边支座沉降次内力弯矩（KN·m）剪力(KN)弯矩(KN·m)剪力(KN)左支点0-160.220335.76边跨1/4-2401.31-160.225036.34335.76边跨1/2-4806.62-160.2210072.67335.76边跨3/4-7209.93-160.2215109.01335.76左中支点（左）-9611.23-160.2220145.34335.76左中支点（右）-9611.23195.8220145.34-615.56中跨1/4-7209.92195.8211845.84-615.56中跨1/2-4394.68195.823546.34-615.56中跨3/4-1579.44195.82-4751.16-615.56右中支点（左）2401.31195.82-13052.67-615.56右中支点（右）2401.31-35.60-13052.67279.80边跨1/41802.48-35.60-9789.50279.80边跨1/21201.65-35.60-6526.33279.80边跨3/4600.82-35.60-3261.16279.80右边支点0-35.600279.80表3-8右中、右支座沉降效应截面左边支座沉降次内力右边支座沉降次内力弯矩（KN·m）剪力(KN)弯矩(KN·m)剪力(KN)左支点035.600-279.80边跨1/4-600.8235.603261.16-279.80边跨1/2-1201.6535.606526.33-279.80边跨3/4-1802.4835.609789.50-279.80左中支点（左）-2401.3135.6013052.67-279.80左中支点（右）-2401.31-195.8213052.67615.56中跨1/41579.44-195.824751.16615.56中跨1/24394.68-195.82-3546.34615.56中跨3/47209.92-195.82-11845.84615.56右中支点（左）9611.23-195.82-20145.34615.56右中支点（右）9611.23160.22-20145.34-335.76边跨1/47209.93160.22-15109.01-335.76边跨1/24806.62160.22-10072.67-335.76边跨3/42401.31160.22-5036.34-335.76右边支点0160.220-335.761.5内力组合1.5.1按承载能力极限状态设计本高速铁路桥涵设计主要依照承载能力极限状态，忽略偶然作用影响，这里只考虑基本组合，其组合公式：（3-48）根据实际情况：（3-49）1.5.2按正常使用极限状态设计（1）短期效应组合（3-50）根据实际情况：（3-51）长期效应组合（3-52）根据实际情况：）（3-52）计算结果如表：弯矩单位是KN·m，剪力单位是KN表3-9主梁内力承载能力极限状态组合截面内力恒载内力汽车荷载温度应力基础沉降承载能力极限状态组合①②③④⑤左支点0.00.00.00.00.0最大弯矩0.00.00.00.00.0最小弯矩12101.683048.011022.80335.7620105.05最大剪力12101.68-309.671022.80-279.8015096.51最小剪力边跨1/4124810.9530241.0215341.305036.34211811.80最大弯矩124810.95-4215.0615341.30-2401.31159852.56最小弯矩4538.881907.031022.80335.769429.91最大剪力4538.88-815.021022.80-279.805311.26最小剪力边跨1/2136157.4035098.3630682.5010072.67215927.32最大弯矩136157.40-8021.0630682.50-4806.62161651.12最小弯矩-3025.92921.061022.80335.76-1028.20最大剪力-3025.92-1631.021022.80-279.80-4908.90最小剪力边跨3/434039.3521201.0646201.8015109.01125514.27最大弯矩34039.35-12032.9646201.80-7209.9367824.37最小弯矩-10590.72414.041022.80335.76-10815.79最大剪力-10590.72-2661.011022.80-279.80-15431.44最小剪力左中支点（左）-181541.205302.0161365.0020145.34-131627.56最大弯矩-181541.20-31201.0261365.00-9611.23-197611.08最小弯矩-18155.5295.010335.76-21485.73最大剪力-18155.52-3371.020-279.80-26645.95最小剪力左中支点（右）-181541.205302.0161365.0020145.34-131627.56最大弯矩-181541.20-31201.0261365.00-9611.23-197611.08最小弯矩15129.603401.020335.7623084.83最大剪力15129.60-464.830-279.8017364.86最小剪力中跨1/4-11346.4519234.5661365.0011845.8487964.36最大弯矩-11346.45-15031.8661365.00-7209.9230461.50最小弯矩7564.802304.50615.5612611.84最大剪力7564.80-671.230-615.567830.26最小剪力中跨1/245385.8029840.3261365.003546.34166741.38最大弯矩45385.80-12031.0261365.00-4394.68104150.99最小弯矩0.01405.210615.562275.07最大剪力0.0-1405.210-615.56-2275.07最小剪力表3-10主梁内力正常使用极限状态组合截面内力恒载内力车辆荷载温度应力基础沉降短期组合长期组合①②③④⑤⑥左支点0.00.00.00.00.00.0最大弯矩0.00.00.00.00.00.0最小弯矩12101.682406.651022.80335.7615285.2814051.88最大剪力12101.68-236.541022.80-279.8012365.9412114.73最小剪力边跨1/4124810.9526142.3615341.305036.34164568.35149054.99最大弯矩124810.95-3306.8115341.30-2401.31133569.36126890.755最小弯矩4538.881365.211022.80335.766887.335966.365最大剪力4538.88-721.051022.80-279.804602.764307.68最小剪力边跨1/2136157.4030225.8730682.5010072.67198025.02174316.00最大弯矩136157.40-7256.0430682.50-4806.62153160.20139995.76最小弯矩-3025.92725.061022.80335.76-1189.59-1918.51最大剪力-3025.92-1305.281022.80-279.80-3429.42-3549.24最小剪力边跨3/434039.3514592.0346201.8015109.01102405.4071325.89最大弯矩34039.35-11356.0646201.80-7209.9359327.9936032.91最小弯矩-10590.72385.561022.80335.76-9025.99-9651.06最大剪力-10590.72-2201.541022.80-279.80-11712.83-11561.17最小剪力左中支点（左）-181541.204721.0661365.0020145.34-10392.51-134491.33最大弯矩-181541.20-23856.0261365.00-9611.23-155012.75-178538.44最小弯矩-18155.5280.250335.76-16835.04-17779.64最大剪力-18155.52-2461.810-279.80-19484.25-19666.23最小剪力左中支点（右）-181541.204721.0661365.0020145.34-10392.51-134491.33最大弯矩-181541.20-23856.0261365.00-9611.23-155012.75-178538.44最小弯矩15129.602801.020335.7617707.7816866.87最大剪力15129.60-338.920-279.8014578.6614680.34最小剪力中跨1/4-11346.4513886.0461365.0011845.8466836.7217619.38最大弯矩-11346.45-14852.0361365.00-7209.9224790.51-1436.39最小弯矩7564.801751.0