Study on stability of double corsair's main stand
The structure safety is numerically studied on main support of the huge pirate ship by use of finite element method (FEM). In order to the elements meshed successfully, the equivalent treatment is used for the complex structure. The static, structure instability and model analyses are carried out. The static and stability safe coefficient are 6.12 and 19, respectively, which are more than the demand in national standard. The model analysis indicates that the swing frequency is 0.08 Hz, and can be kept off the natural frequency.
STABILITY ANALYSIS OF SIDE FRAME COLUMN WITH SWING COLUMNS
In portal frame structure design,in order to meet the large-span,large space needs,and save the amount of steel,Wind column generally is designed swing column with the upper and the end hinged in the side of frame.Swing column can be set up to reduce the internal forces and the cross-section beams and columns.However,the side frame column slenderness ratio often exceeded with the set of swing column.At the end of this paper,recommendations for the designers was proposed to reduce the length of side column and increasing its stability capacity.
Analytical model of a slotted bolted connection element and its behaviour under dynamic load
Abstract Slotted bolted connection elements (SBCEs) have been used extensively in steel frame structures to mitigate the dynamic response by providing hysteretic damping and nonlinear stiffness to the structure. But an analytical model on this energy dissipation mechanism is absent. This paper presents an analytical model to describe the shear force–deformation behaviour of such an element with two sliding steel plates and a single frictional interface. The initial stiffness and other model parameters can be adjusted within a relatively wide range to control its energy dissipation property. The SBCE is included into a single-degree-of-freedom steel frame, and the behaviour and effect of the structure are studied with cyclic and seismic base excitation. The SBCE is shown to perform effectively in vibration mitigation under the cyclic and earthquake loadings.