基于车桥耦合振动的现浇混凝土渗透性能研究

Study on permeability of cast-in-place concrete based on vehicle bridge coupled vibration

针对车桥耦合振动影响桥梁混凝土渗透性的问题,在室内采用特制的振动台模拟车桥耦合振动的方法,研究车桥耦合振动对现浇混凝土渗透性能的影响。以铺装层为代表进行水泥混凝土配合比优化设计并验证,采用正交试验方案在室内对现浇混凝土模拟车桥耦合振动作用,测试其渗透性能。研究表明:不同振动方案对氯离子迁移系数主要的影响因素是起振时间,其次是频率,振幅和振动施加时间影响最小,影响最大的试验组合是频率为10 Hz,振幅为9 mm,振动施加时间为30 min,起振时间为5 h;不同振动方案对渗水高度主要的影响因素是起振时间,其次是振动施加时间,频率和振幅影响最小,影响最大的试验组合是频率为10 Hz,振幅为3 mm,振动施加时间为60 min,起振时间为5 h。

Aiming at the problem that the vehicle-bridge coupling vibration affects the permeability of concrete bridge,it studies the influence of vehicle-bridge coupling vibration on the permeability of cast-in-situ concrete by using a special shaking table to simulate the vehicle-bridge coupling vibration indoors.Taking the pavement as the representative,the cement concrete mix proportion optimization design is carried out and verified.The orthogonal test scheme is adopted to simulate the coupling vibration of the vehicle and bridge in the laboratory,and the permeability of the concrete is tested.The results show that the starting time is the main factor affecting the chloride migration coefficient of different vibration schemes,followed by the frequency,the amplitude and the application time of the vibration have the smallest influence,and the test combination with the greatest influence is the frequency of 10 Hz,the amplitude of 9 mm,the application time of the vibration is 30 minutes and the starting time is 5 hours.The main influencing factors are the onset time,the second is the onset time of the vibration,and the frequency and amplitude have the smallest influence.The most influencing test combination is the frequency of 10 Hz,the amplitude of 3 mm,the time of the vibration is 60 minutes,and the onset time is 5 hours.