English：

In order to study the mechanical performance of base plate for reinforcement truss compositeslab, a full scale specimen was designed and fabricated, and the static loading test was carried out. Thedeformation behavior of specimen were analyzed. Based on the test, the finite element model of base platefor laminated slab was established by using ABAQUS. Stress distribution law of reinforcements andconcrete was revealed, and parameter extension analysis, including reinforcement diameter, number ofreinforcement truss and concrete strength, was implemented. Results showed that the deflection in themid⁃span of base plate for laminated slab under uniform load increased with the load increasing, and afterloading, the deflection increased with load holding time increasing. The reinforcement truss and itsadjacent concrete bottom plate were the main mechanical part, by which the compression force andtension force were born respectively. As the reinforcement diameter increased, the deflection in the mid⁃span of base plate for laminated slab decreased significantly. When the number of reinforcement truss wasno more than 4, the deflection in the mid⁃span of base plate for laminated slab decreased obviously, butwhen the number of reinforcement truss was more than 4, the deflection no longer decreased significantly.As the concrete strength increasing, there was no obvious effect on the deflection in the mid⁃span of baseplate for laminated slab.