钢筋网对道路混凝土振动能量的阻隔研究
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摘要
针对道路混凝土中钢筋网对振动能量的阻隔,通过采集、比较振动加速度和测定分层密度等方法,研究振动能量在混凝土中(钢筋网上、下)的传播情况.研究表明:经过单层钢筋网的阻隔,振动能量水平方向上约衰减12%,竖直方向上约衰减19%;钢筋网的存在对其上混凝土的振动密实无显著影响,对其下混凝土有较大影响;振动频率和振动延续时间是影响振动能量衰减系数的关键因素,适当的增大振动频率、延长振动延续时间可以有效的减小能量衰减.
By collecting coMParing vibration acceleration and determining density stratification,the propagation of energy in the concrete was studied to to reflect vibration barrier of road concrete from steel mesh.The results indicate that: vibration energy attenuation in horizontal direction is about 12%,meanwhile in vertical direction is about 19% through single steel mesh;Steel mesh has no significant effect on concrete above steel mesh,but has great significant effect on concrete blow steel mesh;Vibration frequency and time greatly affect coefficient of vibration energy attenuation,and appropriately increasing frequency or time can effectively reduce the energy attenuation.
By collecting coMParing vibration acceleration and determining density stratification,the propagation of energy in the concrete was studied to to reflect vibration barrier of road concrete from steel mesh.The results indicate that: vibration energy attenuation in horizontal direction is about 12%,meanwhile in vertical direction is about 19% through single steel mesh;Steel mesh has no significant effect on concrete above steel mesh,but has great significant effect on concrete blow steel mesh;Vibration frequency and time greatly affect coefficient of vibration energy attenuation,and appropriately increasing frequency or time can effectively reduce the energy attenuation.
引文
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[2]秦厚慈,刘超英,周山.论零坍落度混凝土振动衰减规律[J].合肥工业大学学报,1998,21(1):97-99.
[3]SANDOR P.新拌混凝土[M].陈志源,译.北京:中国建筑工业出版社,1990.
[4]戴俊.岩石动力学特性与爆破理论[M].北京:冶金工业出版社,2002.
[5]VOELLMY A.High concrete quality in cold weather[J].Rilem Symposium,1956,43:74-76.
[6]NEWLON H.Theroy of concrete slump loss as relatedto use chemical admixtures[J].Design and Construc-tion,1979,2:36-43.
[7]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[8]张艳聪,王大鹏,侯子义.新拌道路混凝土最佳振动延续时间的室内试验研究[J].公路交通科技,2010,27(11):282-284.
[9]王建,姚令侃,蒋良潍.地震作用下土体变形破坏模式与机理[J].西南交通大学学报,2010,45(2):196-202.
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