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首頁 > 技術與支持 > 混凝土抗彎拉彈性模量試驗裝置試驗結果計算方法
混凝土抗彎拉彈性模量試驗裝置試驗結果計算方法
點擊次數:1399 更新時間:2020-06-21

混凝土抗彎拉彈性模量試驗裝置試驗結果計算方法:
1、混凝土抗彎拉彈性模量按簡支梁在三分點各加荷載等的跨中撓度公式反算
求得:(T0559-1)
式中:——混凝土抗彎拉彈性模量(MPa);——終荷載及初荷載(N);——對應及的千分表讀數(mm);——試件支座間距離(=450mm);——試件斷面轉動慣量(mm4)。
2、以3個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)算術(shu)平均(jun)值(zhi)(zhi)(zhi)(zhi)(zhi)為(wei)測(ce)(ce)定值(zhi)(zhi)(zhi)(zhi)(zhi)。3個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)中(zhong)(zhong)最(zui)大(da)(da)值(zhi)(zhi)(zhi)(zhi)(zhi)或最(zui)小值(zhi)(zhi)(zhi)(zhi)(zhi)中(zhong)(zhong)如(ru)有一個(ge)(ge)(ge)(ge)與中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)之差(cha)超過(guo)中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)15%,則(ze)(ze)把(ba)最(zui)大(da)(da)值(zhi)(zhi)(zhi)(zhi)(zhi)和最(zui)值(zhi)(zhi)(zhi)(zhi)(zhi)舍去,以中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)作為(wei)試(shi)(shi)件(jian)的(de)抗彎(wan)拉強度。如(ru)有兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)與中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)差(cha)值(zhi)(zhi)(zhi)(zhi)(zhi)均(jun)超過(guo)中(zhong)(zhong)間(jian)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)15%時,則(ze)(ze)該組(zu)試(shi)(shi)驗結(jie)(jie)(jie)果(guo)(guo)無效(xiao)。3個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)中(zhong)(zhong)如(ru)有一個(ge)(ge)(ge)(ge)斷(duan)(duan)(duan)裂面(mian)(mian)位于加(jia)荷點(dian)外(wai)側,則(ze)(ze)混凝(ning)土抗彎(wan)拉強度按另外(wai)兩(liang)個(ge)(ge)(ge)(ge)試(shi)(shi)件(jian)的(de)試(shi)(shi)驗結(jie)(jie)(jie)果(guo)(guo)計算。如(ru)果(guo)(guo)這(zhe)兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)差(cha)值(zhi)(zhi)(zhi)(zhi)(zhi)不大(da)(da)于這(zhe)兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)中(zhong)(zhong)較(jiao)小值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)15%,則(ze)(ze)以兩(liang)個(ge)(ge)(ge)(ge)測(ce)(ce)值(zhi)(zhi)(zhi)(zhi)(zhi)的(de)平均(jun)值(zhi)(zhi)(zhi)(zhi)(zhi)為(wei)測(ce)(ce)試(shi)(shi)結(jie)(jie)(jie)果(guo)(guo),否(fou)則(ze)(ze)結(jie)(jie)(jie)果(guo)(guo)無效(xiao)。如(ru)果(guo)(guo)有兩(liang)根試(shi)(shi)件(jian)均(jun)出現斷(duan)(duan)(duan)裂面(mian)(mian)位于加(jia)荷點(dian)外(wai)側,則(ze)(ze)該組(zu)結(jie)(jie)(jie)果(guo)(guo)無效(xiao)。注(zhu):斷(duan)(duan)(duan)面(mian)(mian)位置在試(shi)(shi)件(jian)斷(duan)(duan)(duan)塊短邊(bian)一側的(de)底面(mian)(mian)中(zhong)(zhong)軸(zhou)線上量得。結(jie)(jie)(jie)果(guo)(guo)計算精確至1OOMPa。