模拟地震对新浇注混凝土钢筋握裹强度的影响
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摘要
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 h7、2 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。
The bond strength of steel bars of fresh concrete after the occurrence of an earthquake was investigated.Experiments were carried out through the simulated earthquakes that were generated by a high-performance vibrating platform with a size of 6 m × 6 m,provided by the Nuclear Power Institute of China.EI 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,12,24,48,72,and 168 hours,were used for the comparison purpose.The test results showed that the bond strength of steel bars of the fresh concrete after 28 days were hardly affected compared with that without vibrated.
The bond strength of steel bars of fresh concrete after the occurrence of an earthquake was investigated.Experiments were carried out through the simulated earthquakes that were generated by a high-performance vibrating platform with a size of 6 m × 6 m,provided by the Nuclear Power Institute of China.EI 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,12,24,48,72,and 168 hours,were used for the comparison purpose.The test results showed that the bond strength of steel bars of the fresh concrete after 28 days were hardly affected compared with that without vibrated.
引文
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[3]The People’s Republic of China ministry of housing and Ur-ban.Earthquake Building Evaluation and StrengtheningTechnical Guide[S].2008.[中华人民共和国住房与城乡建设部.地震灾后建筑鉴定与加固技术指南[S].2008.]
[4]GB/T 50344-2004,建筑结构检测技术标准[S].
[5]GB 50292-1999,民用建筑可靠性鉴定标准[S].
[6](90)建抗字第377号,建筑地震破坏等级划分标准[S].中华人民共和国住房与城乡建设部.
[7]GB 50023-2009,建筑抗震鉴定标准[S].
[8]Ke Xiaodi.The new placement of reinforced concrete founda-tion plate by the strength of shock after disturbance Masterthesis[D].Taiwan:Chaoyang University of Technology,2006.
[9]Heng Zhuanxu.Effects of earthquake excitation on thestrength properties of newly placed Fly Ash Concrete(35MPa)[D].Taiwan:FengChia University2,007.
[10]Wei Jiandong,Li Guhua,He Guangjie,et al.Effects ofearthquake on the strength and bond strength of fresh con-crete[R].Chengdu,2009.[魏建东,李固华,何广杰,等.地震对新浇混凝土强度、钢筋握裹力的影响[R].成都,2009.]
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