A new type of composite structure, the composite box girder with corrugated steel webs (CSWs) and trusses, is proposed recently. In order to investigate the structural behavior under positive and negative bending moments, flexural tests of the continuous girder were carried out, and the failure modes, deformation patterns, strain distribution, and development of the concrete cracks were investigated. Finite element analysis was conducted to investigate the effect of the range of concrete in the steel tube and the thickness of CSWs on the flexural behavior. The experimental and numerical results show that the test beam has a good ductility and integrity under flexural load. The contribution of CSWs to the flexural bearing capacity is very small and can be neglected. Besides, the plane section assumption is still valid when only top concrete slab and bottom steel tubes are concerned. The concrete filled in bottom steel tubes increases the stiffness and the bearing capacity of the girder. Equations to calculate the flexural bearing capacity under positive and negative bending moments were put forward and then verified with experimental results.

最近提出了一种新型组合结构，即波形钢腹板（CSWs）和桁架的组合箱梁。为了研究正负弯矩下的结构行为，对连续梁进行了弯曲试验，研究了混凝土裂缝的破坏模式、变形模式、应变分布和发展。进行了有限元分析以研究钢管中混凝土的范围和 CSW 的厚度对弯曲行为的影响。试验和数值结果表明，试验梁在弯曲荷载作用下具有良好的延性和整体性。CSW 对弯曲承载力的贡献很小，可以忽略不计。除了，当仅考虑顶部混凝土板和底部钢管时，平面截面假设仍然有效。底部钢管中填充的混凝土增加了梁的刚度和承载力。提出了正负弯矩下的抗弯承载力计算方程，并与试验结果进行了验证。