For the influence of the shear connectivity and web depth-thickness ratio to the non-linear behavior, bearing capacity and failure mode in steel-concrete composite box beam, three specimens of composite box beam with separate test parameters were tested under simple beam load. The results of failure modes, the slip between steel and concrete, integral working performance and shear lag were presented. The results show that failure mode is related to shear connectivity and depth-thickness ratio. The failure mode includes bending failure, unstable failure and slip failure, and the structure is in flexible working state under normal loads. The plane-section assumption is met when the full shear connects, but it no longer holds when incomplete shear connects. Slip is proportional to load in the elastic stage, but in elastic-plastic stage the slip curves show turning point.%为了解剪力连接程度和腹板高厚比对钢-混凝土组合箱梁非线性性能、极限承载力、破坏方式的影响,进行3个不同设计参数的组合箱梁单调荷载作用下抗弯性能试验研究.对组合箱梁的破坏形态、混凝土面板与钢箱梁间滑移、截面整体工作性能、正截面受弯承载力与剪力滞后等进行研究.试验研究结果表明:组合箱梁破坏模式与剪力连接程度和腹板高厚比有关,组合箱梁的破坏模式有弯曲破坏、失稳破坏和滑移破坏,在正常荷载作用下,结构处于弹性工作状态.完全剪力连接时,箱梁满足平截面假定,不完全剪力连接时平截面假定不再成立；在弹性阶段滑移与荷载成正比,在弹塑性阶段滑移曲线出现转折.
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