ANSYS Analysis On Profiled Steel Sheeting-Concrete Composite Deck Slab Under High Temperature

ANSYS has become the preferred tool for numerical simulation for its strong pre-and post-processing capabilities and its strong capacity of non-linear analysis. However, as a common project software, ANSYS also has limitations. For the analysis of composite slab under fire, large deformation and large rotation occur when the composite slab exposed to fire, it belongs to geometry non-linear problem, requires the employ of the finite deformation theory to solve it. The paper is to develope ANSYS secondary with the tools it provides, employ the finite deformation theory, which is basing on S-R decomposition theorem, to solve geometric nonlinear problems. Details as follow:Firstly, the overview of current research and development of profiled steel sheeting-concrete composite deck slab has been briefly introduced, as well as the status quo of research and application of secondary development of ANSYS, and the mechanical parameters, thermal parameters of steel and concrete used to numerical simulation in the paper have been fixed on basing on study achievements that alreadyexisting.Secondary, the temperature distribution of the profiled steel sheeting-concret composite deck slab under fire has been analysed with the use of ANSYS, then the result of analysis has been compared with trial result, we found that the result of simulation is rather accurate, it can be used to the structure analysis. According to the relevant data of temperature distribution ascertained by the paper, analysis on the behavior of composite slab under fire has been done, and the result has been compared with the trial result, which indicates the result of structure analysis with ANSYS is not accurate enough.Thirdary, a general steps has been developed based on the geometry larger deformation theory. After comparing the stiffness formula basing on update co-moving coordinate method with the stiffness formula used by ANSYS, the resource subroutine of LINK8, which is a 3-D bar element, has been modified to form user's subroutines with the use of ANSYS secondary development tools. In this paper two user's element have been created to simulate the concret and steel of composite slab under fire, they have been compiled and linked to ANSYS to generate user's ANSYS executive file, which can use the user's elements like the other standard elements in ANSYS element library, consequentially the user's ANSYS executive file has been enabled to employ update co-moving coordinate method to solve geometric nonlinear problems.Finally, the newly generate ANSYS executive file has been used to simulate the behavior of composite slab under fire with the use of the two user's elements, then the results of simulation has been compared with the result of trial and standard use of elements.