Concrete Composite Plate Mechanical Properties And Dynamic Numerical Simulation

At present, the researches around the stationary of characteristics of composite slabs have carried very deeply while the study on the dynamic characteristics of composite slabs seldom be talked about. Composite slabs in the bridge.industrial buildings and high-buildings have been get more and more attention, dynamic performance of concrete composite slabs structure in the above areas often play a vital role. Therefore, the dynamic characteristics of them have great practical significance. This article from the following aspects of the concrete composite slabs to study the dynamic performance, and several major conclusions have been gotten, hoping to provide a useful reference for engineering practice.Theoretically, the natural frequencies and mode shapes of the four slabs have been calculated and the theoretical calculation of the data has been compared with the existing experimental data, verifying the accuracy of test data.Finite element models were set up by finite element analysis software, modal analysis of the four composite slabs were finished and its results with existing experimental data are compared to verify the accuracy of numerical analysis.Numerical modal analysis of composite slabs under different boundary conditions and span were carried out, their first 1 to 3 natural frequencies and mode shapes were obtained, verifying the frequency meeting with the existing code[56].The slip between the concrete and steel slab was simulated by spring elements. The result shows that behavior of composite slab is better than concrete slab.Through the analysis of hysteresis loop, the results show that the hysteresis loop of composite slab is fuller than those of ordinary concrete slab. Before Crack composite slab is in the elastic state; after crack, generally stiffness degradation is occurred.Larger hysteresis loop area, more energy can be consumed, benefitting the earthquake proof;The more consecutive cycles were, the more the average stiffness degradation were.The test results are contented with the finite element analysis result well.Finite element analysis can be used in studies.