好文档就是一把金锄头!
欢迎来到金锄头文库![会员中心]
电子文档交易市场
安卓APP | ios版本
电子文档交易市场
安卓APP | ios版本

混凝土离差系数及保证率计算方法.doc

3页
  • 卖家[上传人]:汽***
  • 文档编号:545791550
  • 上传时间:2023-03-30
  • 文档格式:DOC
  • 文档大小:73KB
  • / 3 举报 版权申诉 马上下载
  • 文本预览
  • 下载提示
  • 常见问题
    • 混凝土离差系数及保证率计算方法1、离差系数CV 2、混凝土保证率P:① 先计算z值:上两个式中:——抽样混凝土试件平均强度(MPa);——混凝土强度设计值(MPa);σ(n-1)——混凝土统计均方差;(MPa)Cv——混凝土离差系数(%)② 以z值查标准正态分布表(附表1续)可求得混凝土保证率PSL176-2007l 同一标号混凝土28d强度组数5≤i<30-0.7>R标-1.6≥0.83R标(R标≥20MPa)≥0.80R标(R标<20MPa)<2.0(1.5)MPa,应该=2.0MPa(R标≥20MPa),=,1.5MPa(R标<20MPa)l 同一标号混凝土28d强度组数2≤i<5≥1.15R标Rmin≥0.95R标l 同一标号混凝土28d强度组数i=1R≥1.15R标l CV<0.14,0.18(R标≥20MPa)CV<0.18,0.22(R标<20MPa)离差系数Cv==0.053;;概率度系数t==1.935,再经查询正态分布表得出保证率为97.3l 无筋混凝土保证率P85%优良,80%合格配筋混凝土保证率P95%优良,90%合格z01234567890.00.10.20.30.40.50.60.70.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.42.52.62.72.82.90.50000.53980.57930.61790.65540.69150.72570.75800.78810.81590.84130.86430.88490.90320.91920.93320.94520.95540.96410.97130.97720.98210.98610.98930.99180.99380.99530.99650.99740.99810.50400.54380.58320.62170.65910.69500.72910.76110.79100.81860.84380.86650.88690.90490.92070.93450.94630.95640.96480.97190.97780.98260.98640.98960.99200.99400.99550.99660.99750.99820.50800.54780.58710.62550.66280.69850.73240.76420.79390.82120.84610.86860.88880.90660.92220.93570.94740.95730.96560.97260.97800.98300.98680.98980.99220.99410.99560.99670.99760.99820.51200.55170.59100.62930.66640.70190.73570.76780.79670.82380.84850.87080.89070.90820.92360.93700.94840.95820.96640.97220.97880.98340.98710.99010.99250.99430.99570.99680.99770.99830.51600.55570.59480.63310.67000.70540.73890.77030.79950.82640.85080.87290.89250.90990.92510.93820.94950.95910.96710.97380.97930.98380.98740.99040.99270.99450.99590.99690.99770.99840.51990.55960.59870.63680.67360.70880.74220.77340.80230.82890.85310.87490.89440.91150.92650.93940.95050.95990.96180.97440.97980.98420.98780.99060.99290.99460.99600.99700.99780.99840.52390.56860.60260.64060.67720.71230.74540.77640.80510.83150.85540.87700.89620.91310.92780.94060.95160.96080.96860.97500.98020.98460.98810.99090.99310.99480.99610.99710.99790.99850.52790.56750.60640.64430.68080.71570.74860.77940.80780.83400.85770.87900.89800.91470.92920.94180.95250.96160.96930.97560.98080.98500.98840.99110.99320.99490.99620.99720.99790.99850.53190.57140.61000.64800.68440.71900.75170.78230.81060.83650.85990.88100.89970.91620.93060.94300.95350.96250.97000.97620.98120.98540.98870.99130.99340.99510.99630.99730.99800.99860.53590.57530.61410.65170.68790.72240.75490.78320.81330.83890.86210.88300.90150.91770.93190.94410.95450.96330.97060.97670.98170.98570.98900.99160.99360.99520.99640.99740.99810.99863.00.99870.99900.99930.99950.99970.99980.99980.99990.99991.0000附录C 普通混凝土试块试验数据统计方法C.0.1 同一标号(或强度等级)混凝土试块28天龄期抗压强度的组数n≥30时,应符合表C.0.1的要求:表C.0.1混凝土试块28天抗压强度质量标准项 目 质量标准 优良 合格任何一组试块抗压强度最低不得低于设计值的 90% 85%无筋(或少筋)混凝土强度保证率 85% 80%配筋混凝土强度保证率 95% 90%混凝土抗压强度的离差系数:<20MPa <0.18 <0.22≥20MPa <0.14 <0.18C.0.2 同一标号(或强度等级)混凝土试块28天龄期抗压强度的组数30>n≥5时,混凝土试块强度应同时满足下列要求:Rn-0.7Sn>R标 (C.0.2-1)Rn-1.60Sn≥0.83R标 (当R标≥20) (C.0.2-2) 或≥0.80R标 (当R标<20) (C.0.2-3)式中: Sn——n组试件强度的标准差,MPa。

      当统计得到的Sn<2.0(或1.5)MPa时,应取Sn=2.0MPa(R标≥20MPa);Sn=1.5MPa(R标<20Mpa); Rn——n组试件强度的平均值,MPa; Ri——单组试件强度,MPa; R标——设计28天龄期抗压强度值,MPa; n ——样本容量C.0.3 同一标号(或强度等级)混凝土试块28天龄期抗压强度的组数5>n≥2时,混凝土试块强度应同时满足下列要求:≥1.15R标 (C.0.3-1)Rmin≥0.95R标 (C.0.3-2)式中 ——n组试块强度的平均值,MPa; R标——设计28天龄期抗压强度值,MPa; Rmin——n组试块中强度最小一组的值,MPaC.0.4 同一标号(或强度等级)混凝土试块28天龄期抗压强度的组数只有1组时,混凝土试块强度应满足下列要求:R≥1.15R标 (C-5)式中 R ——试块强度实测值,MPa; R标——设计28天龄期抗压强度值,Mpa。

      点击阅读更多内容
      关于金锄头网 - 版权申诉 - 免责声明 - 诚邀英才 - 联系我们
      手机版 | 川公网安备 51140202000112号 | 经营许可证(蜀ICP备13022795号)
      ©2008-2016 by Sichuan Goldhoe Inc. All Rights Reserved.