连续式桥梁伸缩缝界面黏结性能研究

Bonding Performance of Expansion Joints Interface for Continuous Bridge

通过有限元计算,分析了连续式桥梁伸缩缝界面在交通荷载及温度收缩变形作用下的受力特征;探讨了连续式桥梁伸缩缝界面脱开原因;研究了伸缩缝材料模量、铺装厚度、宽度和界面接触条件对界面黏结性能的影响。结果表明:当温度收缩变形比较大时,界面温度拉应力比界面荷载剪应力对界面黏结状态影响大;当温度收缩变形比较小时,界面温度拉应力比界面荷载剪应力对界面黏结状态影响小;适当地增加伸缩缝材料的模量和宽度,减小铺装厚度和界面摩擦系数可以相应提高伸缩缝界面的黏结性能。

The mechanical characteristic of continuous bridge expansion joints interface under traffic loads and temperature contraction were studied by finite element analysis and the causes for de-bonding of continuous bridge expansion joints inter- face were discussed. The influences of joint material modulus, pavement thickness, width and the interracial contact condi- tions on the interracial bonding performance were then analyzed. The results shows that when the temperature contraction de- formation is relative large, the tensile stress caused by temperature contraction has greater influence on the interracial bond- ing performance than the shear stress caused by traffic loads; when the temperature contraction deformation is relative small, the tensile stress has less influence on the interracial bonding performance than the shear stress does. It is concluded that in- creasing the joint material modulus and width, reducing the pavement thickness and coefficients of interracial friction are provided to improve the bonding performance of expansion joints interface.