| Recently, with the whole development of our economic society, the steel structure is widely used, which has the characteristics of the short cycle of production, the fast speed of construction, the attractive appearance, the high strength, the high plasticity and the light deadweight; moreover, it is comparatively reasonable to make use of the resources and energy and has the little destruction to the environment. Steel structure also achieved preferable economic benefit of the wide usage among industrial and civil buildings. The experiment and the theory research of the steel structure are focused on the joint on H-column and H-beam. However, especially in our country, the research of joint on Box-column and H-beam is little covered. Meanwhile, owning to many welding lines and complicated welding procedure, the box column is rarely adopted aboard, which has been already replaced by the rectangle-column with only one welding line. However, this type of joint should be widely used in our practical applications of engineering field.This type of joint are clearly explained in the book of《Code for design of steel structures》GB50017-2003, which respectively defines the satisfying conditions of joint in the tensile zone and bearing zone, and the definition comes from the stress analysis to the H-column and H-beam. However, the box-column can not apply mechanically because of the totally differences of its stress model. The research for the paper focuses on the joint in plane frame, especially studies the aspect of its capability in tensile zone. During the course of research, the extreme bearing capacity of the joint among all forms of models is interactively taken into account with two conditions: intension control and distortion control. However, little research has been conducted in distortion control recently; therefore, the study of distortion control is only mainly based on the research result on the joint which the main pipe and attached pipe are both rectange from J.A.Packer.This paper have made a deep and all-sided study on the influencing factor of extreme bearing capacity to the joint, compared with LengGang's research result on side joint, the following conclusions are drawn:①For the joint in the plane frame, the thickness of beam flange has smaller influence on the bearing capacity to the joint, but the width of the beam flange is more obvious under the influence of dint. Under the same circumstance of pulling, the wider the beam flange becomes, the higher loading capability the joint gets.②For the joint in the plane frame, the thickness of the column flange has big influences on the dint and distortion to the joint. The thicker the column flange is, the higher the extreme bearing capacity is, and the both nearly assume the linear relations.③For the interior joint in the plane frame, the RAC(The ratio of axial compressive force to axial compressive ultimate capacity of section) has certain influences on the extreme bearing capacity of the joint, the general RAC with 0.6 extreme bearing capacity lowers 10～20% than whose extreme bearing capacity is 0.4.④The comparisons between the interior joint and side joint in the plane frame, compared with the extreme bearing capacity, the former is generally improved, which can raises to 25% the most. However, when the width of the beam flange is over 200mm, on the contrary, the extreme bearing capacity falls down less than 5%.
|
PDF Full Text Request