混凝土徐變系數(shù)計(jì)算說(shuō)明書(shū)

1、混凝土徐變系數(shù)計(jì)算說(shuō)明書(shū)一 計(jì)算說(shuō)明混凝土加載齡期考慮兩種情況為加載7天和加載28天。計(jì)算依據(jù)為2004-10-01實(shí)施得公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范之附錄F.2。新規(guī)范中對(duì)與大氣接觸長(zhǎng)度沒(méi)有做出明確的規(guī)定，于是本說(shuō)明書(shū)就箱粱內(nèi)部與大氣接觸面積分別取系數(shù)1和0.5計(jì)算。二 計(jì)算公式式中 加載時(shí)得混凝土齡期（d）計(jì)算考慮時(shí)刻得混凝土齡期（d）RH環(huán)境年平均相對(duì)濕度（）為70RH0=100%=1d=10Mpa三 計(jì)算結(jié)果表1根據(jù)兩種規(guī)范計(jì)算徐變系數(shù)表（加載齡期為7天）加載天數(shù)舊規(guī)范新規(guī)范加載齡期為7天系數(shù)為1系數(shù)為0.570.53700170.74560.5538083490.5201

2、69698280.88980.6894206780.64785722370.96680.7650811580.719234457471.0260.8314133750.781921513571.0670.8862009050.833792479671.0970.9331312780.878303703821.1310.9931747350.935374781971.1571.0442870430.9840806531121.1791.0888619771.0266620981271.1981.1284115621.0645338661471.2231.1750513711.1093160391

3、871.2681.2529959271.1844846612471.3311.344244071.2730886112971.3791.4047871431.3322957763571.4331.4647994841.3913599854271.4921.5223443211.448387515411.5781.5963233951.5223330166801.6731.6646572751.5913446169661.8491.7615075781.69049120911861.95E+001.8127071591.74361849812961.99E+001.8334856191.7653

4、3370314942.07E+001.865023461.798473613表2根據(jù)兩種規(guī)范計(jì)算徐變系數(shù)表（加載齡期為28天）加載天數(shù)舊規(guī)范新規(guī)范加載齡期為28天系數(shù)為1系數(shù)為0.57001700280.3600370.46630.4131300560.388018955470.54390.5152725010.484165785570.5970.5830987120.548133587670.63510.6352848480.597442849820.67540.6971619370.656039824970.70490.7469094340.7032754891120.72880.7887

5、238770.7430810491270.74970.8248769160.7775833841470.77510.8665962040.8175098451870.82170.9345974450.8828849512470.88561.0121692890.9579930732970.93491.0627272581.0073066583570.991.1122743071.0559544034271.0491.1593377831.1024937325411.1371.2192981191.1623124086801.2321.2742160811.2176853419661.3981.3513938351.29659182811861.51E+001.3919162841.3385993512961.55E+001.4083109761.35571911214941.63E+001.4331413951.381792102徐變系數(shù)發(fā)展曲線見(jiàn)