Box beam vertical moment test mechanism

The invention provides a box beam vertical moment test mechanism which comprises a loading mechanism, connecting bridges and supporting bases. The connecting bridges comprise a left connecting bridge and a right connecting bridge, the supporting bases comprise a left supporting base and a right supporting base, bolt holes are formed in the left connecting bridge and the right connecting bridge, a model test section is arranged between the left connecting bridge and the right connecting bridge through bolts, shaft supports are arranged on the lower end face of the left connecting bridge and the lower end face of the right connecting bridge, shaft supports are arranged on the upper end face of the left supporting base and the upper end face of the right supporting base, the shaft support of the left connecting bridge is arranged on the shaft support of the left supporting base through a first rolling shaft, the shaft support of the right connecting bridge is arranged on the shaft support of the right supporting base through a second rolling shaft, and the loading mechanism is arranged on the model test section. The box beam vertical moment test mechanism is novel in structure, the span of the whole structure is increased through the components, and the deformation of a local test piece is monitored through overall deformation. Under the condition of even loading, the data needed in the test can be collected more easily.