模拟地震对新浇注混凝土钢筋握裹强度的影响

试验采用中国核动力院的6 m×6 m高性能地震模拟试验台和EI centro地震时程曲线,研究了C30和C50新浇混凝土遭受7度或8度模拟地震后钢筋握裹强度,震动时新浇混凝土的龄期分别为12 h、24 h、48 h、72 h和7d.试验结果表明与未遭受震动的混凝土相比,7度或8度震动对新浇混凝土在龄期28 d时的钢筋握裹强度的影响很小.

Effect on the bond strength of steel bars of fresh concrete after the occurrence of an simulated earthquake

Abstract: This study concentrates on investigating the bond strength of steel bars of fresh concrete after the occurrence of an earthquake. The experiments have been carried out through the simulated earthquakes that were generated by a high-performance vibrating platform with a size of 6m×6m, provided by the Nuclear Power Institute of China. E1 centro was used to take the recordings of the time series of parameters. The fresh concrete samples of C30 and C50 were taken to check their bond strength of steel bars after the simulated earthquakes at magnitude of 78. The five ages of fresh concrete, 12, 24, 48, 72hours and 7days, were used for the comparison purpose. The test results show that the bond strength of steel bars of the fresh concrete after 28 days are hardly affected.comparable to the without vibrated.