With the increase of the arch bridge span, the mechanical properties of arch bridges will decrease rapidly. In order to solve this problem, triangular net is set between the arch rib and girder to form a kind of truss arch bridge in which arch rib acts as top chord, girder acts as lower chord, triangular net acts as web member, and hangers provide elastic restrains at several points. The triangle stability of the truss can improve linear stiffness of arch rib and girder, which will thus improve the mechanical properties of arch bridges. A test bridge with a span of 50 m was built to prove the superiority of the truss arch bridge with multi-point elastic constraints (MTAB). Structural stresses and displacements were obtained through dead load experiments, and the mechanical properties of the structure were calculated through the finite element (FE) software. It is turned out that, compared with the conventional through arch bridge (CTAB), the mechanical performance of the MTAB is greatly improved. The test values of structural stresses and displacements match calculation values well. Moreover, with the same steel consumption, the more layers of the triangular net, the better the mechanical properties of the structure.

随着拱桥跨度的增加，拱桥的力学性能会迅速下降。为解决这一问题，在拱肋与大梁之间设置三角网，形成拱肋为上弦，大梁为下弦，三角网为腹杆，吊架提供的一种桁架拱桥。弹性约束在几个点。桁架的三角形稳定性可以提高拱肋和梁的线性刚度，从而提高拱桥的力学性能。搭建了一座跨度为50 m的试验桥，以证明多点弹性约束（MTAB）桁架拱桥的优越性。结构应力和位移是通过静载实验获得的，并通过有限元（FE）软件计算结构的力学性能。结果表明，与传统的通拱桥（CTAB）相比，MTAB的力学性能有了很大的提高。结构应力和位移测试值与计算值吻合良好。而且在钢材用量相同的情况下，三角网层数越多，结构的力学性能越好。