Research On Mechanical Properties Of Petrochemical Heating Furnace Steel Struetures With Wall Panel

Heating furnace steel structures are framework envelope structures with wall panel. These structures have begun to be applied in petrochemical industry, while in China the related research just begins. When we consider the wall effect there is no perfect design theory for effective length of frame column and wall stiffener optimization layout. In order to obtain the seismic performance and failure mechanism of such structures we need to conduct a comprehensive and in-depth test research.In this paper the finite element software ANSYS was used to study the laws of effective length of frame column and the optimized design of stiffener. Cyclic loading test was carried out on the heating furnace steel structures and then the finite element simulation was conducted. The research would provide reference for the design and engineering applications of such structures. The main contents and results are as follows:(1) Two edge pin frameworks of the furnace steel structure were established with the finite element model. By the eigenvalue buckling analysis, we got the effective length and the roll stiffness of frame column. We studied that we should consider the beneficial effect of wall panel. The effective length of frame column was closer to the calculation value of frame without sideways according to the code, and was still relatively safe.(2) The finite element models were established for calculation and analysis in this paper. Applying horizontal concentrated load to the top could well simulate the deformation of the whole structure under the lateral load. Reasonable layout of stiffeners could control the out-of-plane deformation of wall panels effectively. Wall panel would not fail before the main structure and ensure the function of the structure under design load. We selected common parameters of petrochemical heating furnace to establish the finite element model. The rational layout of stiffeners was determined through the analysis, providing a reference for engineering design. (3) A one-bay steel frame full scale model with stiffened steel wall panel was tested under low-frequency cyclic loads.Based on the experiment, the failure mode and energy dissipation mechanism of the structure were analyzed with regard to the load carrying capacity, ductility, stiffness and energy dissipation capacity. The results showed that the specimen exhibited excellent ductility and energy dissipation capacity. The stiffeners improved the work condition of the steel panels and increased the stiffness and load-carrying capacity of the panels. The hysteresis loop present "spindle" curve. The failure mode of the structure was induced by local buckling and crack of the column and local buckling of the infill panels, plastic hinges were formed at the bottom connection of the column-beam. The experiment results provide a basis for engineering application of this structure system.(4)The finite element software ANSYS was used to simulate the stress performance of heating furnace steel structure under low-frequency cyclic loads. Then we got the specimen skeleton curve, hysteresis curve, the stress cloud and the deformation cloud pictures. The finite element results were in good agreement with the test results. So the ANSYS finite element simulation was reasonable.