钻芯法修正回弹强度计算

序号轴线测区测区混凝土强度换算值(MPa)序号轴线测区测区混凝土强度换算值(MPa)137.7136.2238.9237.3338.1338.9438.9438.5536.2536.2637.5637.4737.1737.8836.4837.2938.5937.61036.81038.4135.3138.7235.5239.3334.7338.1432.6438.1532.2536.6633.7638.4732.8738.6832.7839.2934.5939.11033.81038.7134.0135.8235.8237.3334.0338.9433.6438.5537.0537.7637.6637.6733.5737.9833.7837.1933.9938.21034.51038.43-4-A2-3-B4-5-B1-2-A5-6-A3-4-B246135表1二层框架梁测区混凝土强度换算值1061.51137.7序号轴线测区测区混凝土强度换算值(MPa)序号轴线测区测区混凝土强度换算值(MPa)134.4134.0234.7234.4332.9336.6434.4434.0533.3534.4634.5634.5734.6734.9832.1834.1932.8935.41033.41036.2131.6132.2232.5233.6333.4331.5431.6433.6532.3533.3632.7633.7733.8734.5832.5833.5933.4933.71033.61036.24-5-CB-C-53-4-CB-C-381079续表1二层框架梁测区混凝土强度换算值####×94.0####×########×94.0####×########×94.0####×########×94.0####×########×94.0####×########×94.0####×####37.637.633.838.534.837.733.734.932.733.6MPaMPa样品规格(mm)直径×高度抗压强度（MPa）芯样编号轴线芯样编号修正后回弹强度平均值32.2样本标准偏差2.1409B-C-332.729.410B-C-533.630.373-4-C33.730.484-5-C34.831.553-4-B34.831.564-5-B37.734.435-6-A33.830.542-3-B38.535.211-2-A37.634.323-4-A37.634.3总体修正量3.3MPa表1二层框架梁测区混凝土强度换算值修正后序号轴线强度换算平均值（MPa）修正后换算平均值（MPa）98.9101.3回弹强度平均值36.7MPa芯样强度平均值33.4MPa3#5-6-A33.76#4-5-B36.32#3-4-A32.45#3-4-B31.8续表2受检构件芯样混凝土的规格和抗压强度1#1-2-A32.84#2-3-B33.2轴线抗压强度（MPa）样品规格(mm)直径×高度3#5-6-A234.06#4-5-B251.72#3-4-A224.75#3-4-B221.01#1-2-A227.64#2-3-B230.1表2受检构件芯样混凝土的规格和破坏荷载芯样编号轴线样品规格(mm)直径×高度破坏荷载（kN）芯样编号轴线样品规格(mm)直径×高度破坏荷载（kN）10Xk1=#####MPaXk2=#####MPa～#####MPa4.05MPa根据GB/T50344-2004第4.3.3条的规定:“当采用总体修正量方法时,芯样试件换算抗压强度的均值m的推定区间置信度宜为0.90,错判概率和漏判概率均为0.05。同时规定对推定区间上限值与下限值的差值应予以限制。根据GB/T50344-2004中第3.3.21条判定原则,因设计要求值C30小于推定区间的上限值,故该检测批可判定为符合设计要求。推定区间的下限值为即该检测批构件具有90%保证率的强度标准值的推定区间在25.97之间。该推定区间的差值为据GB/T50344-2004中表3.3.19可查得k1=1.01730k2=2.91096则推定区间的上限值为该构件样本容量为