混凝土徐变系数计算说明书

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1、混凝土徐变系数计算说明书一．计算说明混凝土加载龄期考虑两种情况为加载7天和加载28天。计算依据为2004-10-01实施得《公路钢筋混凝土及预应力混凝土桥涵设计规范》之附录F.2。新规范中对与大气接触长度没有做出明确的规定，于是本说明书就箱粱内部与大气接触面积分别取系数1和0.5计算。二．计算公式式中－加载时得混凝土龄期（d）－计算考虑时刻得混凝土龄期（d）RH－环境年平均相对湿度（％）为70％RH0=100%=1d=10Mpa三．计算结果表1　根据两种规范计算徐变系数表（加载龄期为7天）加载天数旧规范新规范加载龄期为7天系数为1系数为0.570.53700170.74560.

2、5538083490.520169698280.88980.6894206780.64785722370.96680.7650811580.719234457471.0260.8314133750.781921513571.0670.8862009050.833792479671.0970.9331312780.878303703821.1310.9931747350.935374781971.1571.0442870430.9840806531121.1791.0888619771.0266620981271.1981.1284115621.0645338661471.223

3、1.1750513711.1093160391871.2681.2529959271.1844846612471.3311.344244071.2730886112971.3791.4047871431.3322957763571.4331.4647994841.3913599854271.4921.5223443211.448387515411.5781.5963233951.5223330166801.6731.6646572751.5913446169661.8491.7615075781.69049120911861.95E+001.8127071591.7436184

4、9812961.99E+001.8334856191.76533370314942.07E+001.865023461.798473613表2　根据两种规范计算徐变系数表（加载龄期为28天）加载天数旧规范新规范加载龄期为28天系数为1系数为0.57001700280.3600370.46630.4131300560.388018955470.54390.5152725010.484165785570.5970.5830987120.548133587670.63510.6352848480.597442849820.67540.6971619370.656039824970.7

5、0490.7469094340.7032754891120.72880.7887238770.7430810491270.74970.8248769160.7775833841470.77510.8665962040.8175098451870.82170.9345974450.8828849512470.88561.0121692890.9579930732970.93491.0627272581.0073066583570.991.1122743071.0559544034271.0491.1593377831.1024937325411.1371.2192981191.1

6、623124086801.2321.2742160811.2176853419661.3981.3513938351.29659182811861.51E+001.3919162841.3385993512961.55E+001.4083109761.35571911214941.63E+001.4331413951.381792102徐变系数发展曲线见附录1，2四、总结从以上的分析中可以得出一下结论：旧规范关于徐变系数的规定比新规范要高。附录1加载龄期为7天的徐变系数发展规律图附录2加载龄期为28天的徐变系数发展规律图