摘要
通过对试验现场地表振动加速度采样分析,得出地面竖向振动加速度的时程幅值和主要频率为0.8m/s2和15-25Hz,并且随着距振源距离的增加振动强度不断衰减,靠近振源测点的振动情况能够更好的反映出列车通过时地表振动的动力特性。通过对浇筑成型的混凝土施加环境振动,得出终凝前混凝土在受振情况下抗压强度得到提高,并且混凝土的早期抗压强度提高的幅度较标准强度大,而终凝后混凝土在环境振动作用下抗压强度基本不发生变化。
Through sampling and analyzing the vibration acceleration of the ground surface of the test field,obtained are the vertical vibration acceleration-time-course amplitude and the main frequency,which are respectively 0.8m/s2 and 15 to 25Hz.Besides,with the increase in the spreading distance,the vibration intensity is steadily reduced.And the vibration near the test point of the vibration source can better reflect the dynamic property of the ground surface vibration when the train moves through the track.Through applying environmental vibration to the shaped concrete,it is found that the compressive strength of the pre-finally-setting concrete is increased under the action of being vibrated,and the increasing magnitude of the initial compressive strength of the concrete is greater than the standard strength of the concrete.However,the compressive strength of the post-finally-setting concrete remains almost unchanged under the environmental vibration.
出处
《国防交通工程与技术》
2015年第6期41-43,25,33,共5页
Traffic Engineering and Technology for National Defence
基金
河北省自然科学基金(E2013210104)
河北省高校百名创新人才支持计划(Ⅱ)
河北省人才工程(A201400213)
关键词
环境振动
混凝土
抗压强度
environmental vibration
concrete
compressive strength
