钢筋网对道路混凝土振动的阻隔及对策
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摘要
道路工程中,钢筋网下的混凝土往往不容易振动密实,钢筋网对振动能量存在阻隔作用。通过比较振动加速度的层间差异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,振动能量在水平方向上约衰减12%,竖直方向上约衰减19%;振捣棒周边混凝土的硬化状态对振动能量的传播有一定影响;钢筋网的存在对其上混凝土的密实无显著影响,对其下混凝土则影响较大;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抑制能量衰减。
In the road engineering,the concrete below reinforced mesh is not always compacted,because the reinforced mesh offers resistance to vibration energy.Through the method of comparing the differences of vibration acceleration and determining the density of the layered concrete,the spread of vibration energy in concrete is studied.It is shown that vibration energy attenuation is about 12% in horizontal direction,meanwhile in vertical direction is about 19% through the reinforced mesh.Concrete hardening state around the vibrating spear has certain effect on the spread of vibration energy.Reinforced mesh has no significant effect on top concrete,but has great effect on the bottom concrete.Vibration frequency and time greatly affect coefficients of vibration energy attenuation,and appropriate increase of vibration frequency or lengthening of vibration time can effectively reduce the energy attenuation.
In the road engineering,the concrete below reinforced mesh is not always compacted,because the reinforced mesh offers resistance to vibration energy.Through the method of comparing the differences of vibration acceleration and determining the density of the layered concrete,the spread of vibration energy in concrete is studied.It is shown that vibration energy attenuation is about 12% in horizontal direction,meanwhile in vertical direction is about 19% through the reinforced mesh.Concrete hardening state around the vibrating spear has certain effect on the spread of vibration energy.Reinforced mesh has no significant effect on top concrete,but has great effect on the bottom concrete.Vibration frequency and time greatly affect coefficients of vibration energy attenuation,and appropriate increase of vibration frequency or lengthening of vibration time can effectively reduce the energy attenuation.
引文
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[6]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.Wang Jian,Yao Lingkan,Jiang Liangwei.Seismic deformation and failure modes and mechanism of soil mass[J].Journal of Southwest Jiaotong University,2010,45(2):196-202.
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[8]张祖武,姚令侃.土岩界面地震波能量传递与耗散特性研究[J].灾害学,2011,26(1):5-8.Zhang Zuwu,Yao Lingkan.Seismic waves scattering in rock inter-face and energy dissipation characteristics[J].Journal of Catastro-phology,2011,26(1):5-8.
[2]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.
[3]Newlon H.Theory of concrete slump loss as related to use chemical admixtures[J].Design and Construction,1979,1:36-43.
[4]廖振鹏.工程波动理论导论[M].北京:科学出版社,2002.
[5]张艳聪.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.Zhang Yancong.Laboratory experimental study on the best vibra-tion time of fresh road concrete[J].Journal of Highway and Transportation Research and Development,2010,27(11):282-284.
[6]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.Wang Jian,Yao Lingkan,Jiang Liangwei.Seismic deformation and failure modes and mechanism of soil mass[J].Journal of Southwest Jiaotong University,2010,45(2):196-202.
[7]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:自然科学版,1998,21(1):97-99.Qin Houci,Liu Chaoying,Zhou Shan.On zero slumpt concrete vi-bration attenuation rules[J].Journal of Hefei University of Tech-nology:Natural Science,1998,21(1):97-99.
[8]张祖武,姚令侃.土岩界面地震波能量传递与耗散特性研究[J].灾害学,2011,26(1):5-8.Zhang Zuwu,Yao Lingkan.Seismic waves scattering in rock inter-face and energy dissipation characteristics[J].Journal of Catastro-phology,2011,26(1):5-8.
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