The Finite Element Analysis Of Variable Cross-section Hollow Beam

Variable cross-section hollow beam not only reduce the weight of the structure itself, optimize the distribution of the weight, but also to the overall seismic performance of the structure had certain enhancement under the premise of meeting the bearing requirement. The flexible layout makes the appearance more beautiful, and it can even obtain the giant economic benefit. So it has a wide application prospect.In my paper, by means of the finite element analysis software SAP2000, changes with different cross section forms of beam element model compared with the results of static analysis and dynamic analysis. The main contents are as follows:(1)For the static analysis, by using the load code for the design of the six kinds of model, three different kinds of load combinations by different models between maximum and minimum principal stress, the most unfavorable changes of the node displacement, describes their change trend. And by using of the von Mises stress yield criterion to distinguish different models into the plastic phase of the dangerous point of the position and value difference, contrast analysis of the profile control the amplitude of the empty of different impact on the original structure.(2)By design the beam element model into a single frame, compared to two kinds of model A and B of the modal analysis, including their15vibration mode cycle and quality to participate in the coefficient. Comparing the two models of the first three order vibration mode translational direction in detail, reverse the situation and differences in values, make a rough compare of the higher order modes. Although the difference, its effects on the structure of the solution. Cycle by comparing the two kinds of model size, model of frame beams are partitioned B found empty after the X to the stiffness decreases, and to increase the stiffness, and Y on the strengthening structure should be considered when designing the resistance to lateral stiffness and other issues like torsional stiffness.(3)The linear time history analysis was carried out on the model A and B, according to the specification has chosen three different seismic wave El Centro wave, the Lanzhou wave and artificial wave, under the action of X or Y to the seismic wave at the bottom of the shear force of contrast, points out that the numerical difference between models.Further more, I study on the model under different seismic wave is at the top of the node displacement of translational. The model B beam profile control found empty after processing seismic effect compared with the model the influence of A to its, the overall structural response under the Y direction is reduced. And in the X direction what should be taken sensibly is that the difference is more apparent.(4)The last work of this paper is some summary and prospect, and I also remained of some deficiencies and problems which need to be studied further.