基于层间接触的空心板梁及桥面铺装在双轴移动荷载下的力学响应分析

Analysis of Mechanical Response of Bridge Deck Pavement under Two-Axis Moving Load Based on Interlayer Contact

目的研究考虑铺装层间接触的桥面铺装及空心板梁在双轴移动荷载下的受力状态,以解决混凝土桥梁在桥面铺装设计时对铺装层之间的关系状态考虑不全面的问题.方法采用ABAQUS有限元软件建立含有沥青铺装层、粘结层、混凝土调平层、空心板及铰缝的数值模型,利用子程序模拟行车移动载荷,设置库仑接触摩擦建立层间接触,考虑不同荷位、层间摩擦系数对空心板梁及桥面铺装的影响.结果铺装层间最大水平接触力出现在梁端区域;铰缝与空心板的挠度相差10%,应力在轮载附近处变化较大;沥青铺装与粘结层间接触摩擦应力为0.2093 MPa,大于混凝土铺装与粘结层间接触摩擦应力0.156 MPa;连续模型与接触模型的应力最大差值达4.5倍.结论不同结构层间界面薄弱,易发生剪切破坏;为防止板与铰缝间发生剪切破坏,可加强轮载附近处板与铰缝的连接;采用不同措施处理各层之间的粘结,可使经济效益最大化;将铺装层视为连续体考虑不周,层间接触假定更符合实际情况.

In order to solve the problem that the connection state between the pavement layers is not comprehensively considered in the design of the bridge deck pavement,we study the stress state of the bridge deck pavement based on interlayer contact and the hollow slab beams under the two-axis moving load.A three-dimensional finite element numerical model containing asphalt paving layer,bonding layer,concrete leveling layer,hollow slab and hinge seam is established using ABAQUS finite element software,and the moving load is simulated by sub-program,and the interlayer contact between different structures is established by setting tangential Coulomb contact friction,considering the comprehensive influence of different loads and interlayer friction coefficient on the hollow slab girder and bridge deck pavement.The maximum horizontal contact force between the paving layers appears in the end of beam;the deflection difference between the hinge and the hollow slab is 10%,and the stress changes greatly near the wheel load;The contact friction stress between the asphalt pavement and the bonding layer is 0.2093 MPa,which is greater than that between the concrete pavement and the bonding layer,0.156 MPa;The stress of continuous model is about 4.5 times bigger than that of the contact mode;The interface between different structural layers is weak and prone to shear failure;in order to prevent shear failure between hollow slab and hinge seam,we can strengthen the connection between hollow slab and hinge seam seam near the wheel load;Different measures can be used to deal with different interlayers respectively to maximize the economic benefits;It is more in line with the actual situation to regard the paving layer as a interlayer-contact structure than a continuum.