钢纤维RPC在正交异性钢桥面铺装上的应用性研究

Study on Application of Steel Fiber RPC in Orthotropic Steel Deck Pavement

正交异性桥面板在现代桥梁工程中被广泛应用,由于其纵横肋交错且钢顶板刚度不足,在局部轮载作用下容易出现应力集中现象,疲劳开裂问题突出。采用组合梁的思路,在正交异性桥面板顶板上铺设一层各项力学性能优异的RPC铺装,通过RPC和钢顶板的共同作用使得顶板刚度得到增强以减小局部应力集中造成的疲劳开裂现象。以苏通大桥正交异性桥面板为对比研究对象,针对三种常见疲劳易损部位的应力幅进行了对比研究,研究结果表明:采用新型RPC复合铺装的正交异性桥面板RPC-顶板整体刚度显著增加,局部应力集中现象减小;新型RPC复合铺装层能够显著降低关注细节的疲劳应力幅。

The orthotropic deck slab is widely used in the modern bridge engineering.Due its crisscross vertical and horizontal ribs,and the insufficient stiffness of steel roof,it is easy to cause the stress concentration and the fatigue cracking problem is serious under the partial wheel load stress.According to the idea of composite beam,a coating of RPC with various excellent mechanical properties is paved on the top of orthotropic deck roof.The roof stiffness is enhanced through the combined action of RPC and steel roof so as to decrease the fatigue cracking phenomenon caused by partial stress concentration.Taking the orthotropic bridge deck slab of Sutong Bridge as the study object,the article compares and studies the stress amplitudes at three common fatigue wearing positions.The study results show that the whole stiffness of orthotropic bridge deck RPC and roof is increased significantly after the use of the new RPC composite pavement,and the partial stress concentration is reduced.The new RPC composite pavement layer can obviously reduce the fatigue stress amplitude of the detailed parts.