混凝土离差系数及保证率计算方法.doc

混凝土离差系数及保证率计算方法.doc

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1、.混凝土离差系数及保证率计算方法1、离差系数CV2、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P。SL176-2007l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

2、.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标精选word范本!.lCV<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97.3。l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z01234567890.00.10.20.30.40.50.60.7

3、0.80.91.01.11.21.31.41.51.61.71.81.92.02.12.22.32.40.50000.53980.57930.61790.65540.69150.72570.75800.78810.81590.84130.86430.88490.90320.91920.93320.94520.95540.96410.97130.97720.98210.98610.98930.99180.50400.54380.58320.62170.65910.69500.72910.76110.79100.81

4、860.84380.86650.88690.90490.92070.93450.94630.95640.96480.97190.97780.98260.98640.98960.99200.50800.54780.58710.62550.66280.69850.73240.76420.79390.82120.84610.86860.88880.90660.92220.93570.94740.95730.96560.97260.97800.98300.98680.98980.99220.51200.55170.591

5、00.62930.66640.70190.73570.76780.79670.82380.84850.87080.89070.90820.92360.93700.94840.95820.96640.97220.97880.98340.98710.99010.99250.51600.55570.59480.63310.67000.70540.73890.77030.79950.82640.85080.87290.89250.90990.92510.93820.94950.95910.96710.97380.9793

6、0.98380.98740.99040.99270.51990.55960.59870.63680.67360.70880.74220.77340.80230.82890.85310.87490.89440.91150.92650.93940.95050.95990.96180.97440.97980.98420.98780.99060.99290.52390.56860.60260.64060.67720.71230.74540.77640.80510.83150.85540.87700.89620.91310

7、.92780.94060.95160.96080.96860.97500.98020.98460.98810.99090.99310.52790.56750.60640.64430.68080.71570.74860.77940.80780.83400.85770.87900.89800.91470.92920.94180.95250.96160.96930.97560.98080.98500.98840.99110.99320.53190.57140.61000.64800.68440.71900.75170.

8、78230.81060.83650.85990.88100.89970.91620.93060.94300.95350.96250.97000.97620.98120.98540.98870.99130.99340.53590.57530.61410.65170.68790.72240.75490.78320.81330.83890.86210.88300.90150.9

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