Friction-plastic hinges and design methods for truss structures and frame structures

Abstract

The invention relates to a friction plastic hinge suitable for a truss structure and a frame structure and a design method. The left side of an arc-shaped sealing plate is connected with a left chordmember, a lining plate is stuck on the right side of the arc-shaped sealing plate, a left connection plate is arranged in the middle of the lining plate, and a limit hole and a rotation hole are formed in the left connection plate; a circular-tube-shaped sealing plate is arranged on a right unit, the right side of the circular-tube-shaped sealing plate is connected with a right chord member, and afriction material is stuck on the left side of the circular-tube-shaped sealing plate; two right connection plates are arranged in the middle of the circular-tube-shaped sealing plate, and limit holes and rotation holes are formed in the right connection plates. The design method comprises the steps that 1, under the situation that a beam is normally used, the continuity is kept, and the outer surface of the friction material is tangent to a flange of the beam; 2, under the effect of the major earthquake, limit pin are preferentially cut off, the area sum of the limit pins is set to be smaller than that of rotation pins, and design parameters are determined by formulas.

Description

technical field [0001] The invention relates to plastic hinges in steel structure beams, in particular to friction plastic hinge technology. Background technique [0002] Plastic hinge means that under the action of load, when the bending moment at several sections in the structure reaches the plastic limit bending moment, the section will rotate to a certain extent, similar to the effect of "hinge", resulting in the redistribution of internal forces in the structure. Under earthquake action, steel structure buildings often form plastic hinges at the beam-column joints to dissipate most of the energy input into the structure. An unstoppable target. This requires the structure to have a feasible energy dissipation mechanism, including establishing the ideal sequence of plastic hinges, and giving appropriate strength to each component to ensure that the plastic hinges of the structure only appear at selected positions, etc. [0003] In order to avoid brittle failure of steel...

AI Technical Summary

Problems solved by technology

[0004] Although the domestic construction methods of plastic hinges in steel structures can effectively realize the outward movement of plastic hinges and achieve the purpose of protecting beam-column joints, there are still the following defects: (1) Plastic hinges are very likely to be completely destroyed, and the energy consumption of the structure is equivalent to that of earthquakes. (2) It is difficult to achieve precise control of structural energy consumption, and can only roughly control the location of plastic hinges; (3) The formation mechanism of plastic hinges largely depends on the properties of steel and the structural details of joints , and some construction methods are more difficult to implement

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