Bending-torsion member of self-adaptive variable-section rectangular steel pipe

Abstract

The invention is a bending and torsion member of a rectangular steel pipe with self-adaptive variable cross-section used in building structures, and is a new type of member. The component is a tubular component with a rectangular cross-section surrounded by a lower thin-walled board (1), two side thin-walled boards (4) and an upper thin-walled board (5). A transverse stiffener (2) and a longitudinal stiffener (3) are fixed inside the tubular member, the transverse stiffener (2) is arranged along the radial direction of the tubular member, and a cavity is arranged on the transverse stiffener (2). A longitudinal stiffener (3) is also fixed inside the tubular member, and the longitudinal stiffener (3) is arranged along the axial direction of the tubular member. The cross section of the longitudinal stiffener (3) is T-shaped or L-shaped. The self-adaptive variable cross-section rectangular steel pipe bending and torsion member in the invention not only meets the requirements in terms of force and shape, but also can effectively reduce the weight of the structure itself, so that the structure can effectively resist the effects of temperature changes, wind loads and earthquakes.

Description

technical field [0001] The invention is a bending and torsion member of a rectangular steel pipe with self-adaptive variable cross-section used in building structures, and is a new type of member. Background technique [0002] With the rapid development of my country's construction projects, especially in some super-long-span structures, many new architectural shapes have appeared. Their architectural shapes are very complicated. Changes with the curvature of the structure, these changes include member bending and torsion, etc., as shown in Figure (1), bending and torsion members have the characteristics of oblique, curved, and irregular shapes. Currently, only curved girder bridges in road and bridge engineering meet the requirements The above characteristics, but there are relatively large defects in the application of curved girder bridges in building structures: (1) curved girder bridges cannot meet the torsion requirements; (2) most of the curved girder bridges are ordina...

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Problems solved by technology

[0002] With the rapid development of my country's construction projects, especially in some super-long-span structures, many new architectural shapes have appeared. Their architectural shapes are very complicated. Changes with the curvature of the structure, these changes include member bending and torsion, etc., as shown in Figure (1), bending and torsion members have the characteristics of oblique, curved, and irregular shapes. Currently, only curved girder bridges in road and bridge engineering meet the requirements The above characteristics, but there are relatively large defects in the application of curved girder bridges in building structures: (1) curved girder bridges cannot meet the torsion requirements; (2) most of the curved girder bridges are ordinary concrete or prestressed concrete structures, and their own weight (3) The shrinkage and creep of concrete will have a relatively large impact on the later bearing capacity of structures or components

In addition, when these bending and torsion members are used in the structure, due to the geometric particularity of these members, the axial force of the members will cause a large bending effect, which makes the stress of the members very complicated. Therefore, how to meet the bearing capacity of each position of the member has become an urgent problem to be solved in the design of bending and torsion members

[0003] In addition, due to the special geometric configuration of bending and torsion members, especially in order to reduce the self-weight of the structure, thin-walled steel members can be used for bending and torsion members. It has achieved relatively good results. It has great advantages in reducing the self-weight of the structure, but it also has great defects when used in the structure: for example, the large-scale thin-walled rectangular section has a large width-thickness ratio, which is prone to local failure. Stable, according to the relevant provisions of the "Code for Design of Steel Structures", the effective width of the section is very small, and the material utilization rate is low

In addition, a large stress concentration may be generated under the action of welding, so the curved panel is prone to local buckling, so the above problems must be solved when designing thin-walled torsion members

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