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为了确定在混凝土早龄期时受到行车荷载引起桥梁振动对新老混凝土黏结面抗拉性能的影响,采用峰值振动加速度为0.08g,0.16g,0.32g,3种振动能量,分别模拟轻、中、重3种交通状态引起的桥梁振动,对处于早龄期的新老混凝土黏结面进行振动试验。试验结果表明:振动发生在初凝前,3种形式的交通(轻、中、重)引起的振动对新老混凝土黏结面早期抗拉强度有增加作用。振动发生在初凝至终凝阶段,轻交通引起振动对新老混凝土黏结面的强度影响不明显;中等和重交通会造成黏结面早期抗拉强度(7 d以前)下降。振动发生在终凝后,轻交通引起的振动对新老混凝土黏结面的强度影响不明显;中等交通的振动会造成黏结面早期强度的下降;重载交通会造成黏结面的强度整体下降。
In order to determine the effect of bridge vibration on the tensile properties of the new-old concrete bonding surface caused by the driving load in the early age of concrete, the peak vibration acceleration of 0.08g, 0.16g, 0.32g, three kinds of vibrational energy were used to simulate the light and medium , Heavy three kinds of traffic conditions caused by vibration of the bridge, in the early age of new and old concrete bonding surface vibration test. The experimental results show that the vibration caused by the three types of traffic (light, medium and heavy) before the initial setting of the initial setting increases the early tensile strength of the new-old concrete bonding surface. Vibration occurs in the initial to final setting stage. The light traffic induced vibration has no obvious effect on the strength of the new-old concrete bonding surface. The medium and heavy traffic will cause the early tensile strength (before 7 d) of the bonding surface to decrease. Vibration occurs in the final setting, the vibration caused by light traffic has no obvious effect on the strength of the new-old concrete bonding surface. The vibration of medium-sized traffic will cause the early strength of the bonding surface to decrease; heavy traffic will cause the overall strength of the bonding surface to decrease.