| The application of composite slabs in bridges,ports and other fields is increasing,and the research on the corresponding composite slabs is still not comprehensive.The steel ribbed steel plate-concrete composite slab does not need formwork,and has the advantages of high bearing capacity,high rigidity,good ductility,small self-weight,convenient construction and the characteristics of temporary emergency and long-term use.It has its unique advantages as a pile foundation wharf slab or bridge deck.Based on the experiment,the mechanical properties of this composite slab are further studied by using ABAQUS finite element software in order to improve the basic research of this composite slab.The main research work and conclusions are as follows:(1)The finite element model of the composite slab considering the non-linearity of material and boundary conditions is established by ABAQUS finite element software,and verified by test specimens.It is found that the composite slab with studs and I-steel ribs is in good agreement,which shows that it is feasible to simulate the composite slab with studs and I-steel ribs.(2)On the basis of validating the feasibility of the model,two static loading tests are simulated by ABAQUS finite element software.Nine specimens are designed separately by orthogonal test design method to study the influence of steel plate thickness,concrete strength grade and steel grade on the mechanical properties of composite slabs with ordinary concrete and high strength concrete.The same conclusions obtained from the two test simulation results are as follows: 1)The failure process of the composite slabs is not affected by these three factors,and it is bending failure;2)Only the steel grade has an influence on the yield deflection of the composite slab,and It is positively correlated;3)With the increase of steel plate thickness,concrete strength grade and steel grade,the yield load and ultimate load of composite slabs are increasing,but the increase range is decreasing;4)The influence degree of each factor on composite slabs is determined by the extreme difference of ultimate load,and the order from big to small is steel grade,steel plate thickness and concrete strength grade.The different conclusions obtained are as follows: 1)The ductility ratio of composite slabs with ordinary concrete fluctuates between 2 and 4,which is basically consistent with the test results,while the ductility ratio of composite slabs with high strength concrete fluctuates between 2 and 7,and the fluctuation range is larger;2)For composite slabs with ordinary concrete,the effect degree of steel plate thickness and concrete strength grade is very close,which is about 55% of the steel grade,while for composite slabs with high strength concrete,compared with the composite slabs with ordinary concrete,the influence degree of concrete strength grade decreased by about 48%,the influence degree of steel plate thickness increased by about 40%,and the influence degree of steel grade only increased by about 11%.(3)The calculation formulas for the flexural capacity and section stiffness in normal service stage of steel-ribbed steel plate-concrete composite slabs are proposed.The experimental results and finite element simulation results are used to verify whether they are right.The results show that the errors are small and they are in good agreement.It shows that the calculation formulas can provide a reference for the design of steel-ribbed steel plate-concrete composite slabs. |
