Bolted steel filling plate-sleeve connection node for beam-post wood structure

Abstract

The invention belongs to the field of civil engineering technology, and particularly relates to a bolted steel filling plate-sleeve connection node for a beam-post wood structure. The connection node comprises a wood beam, a wood post, a steel filling plate, a sleeve, a bolt, a gasket and a nut. The the beam-post connection node is formed by inserting steel filling plates in grooves of the wood beam and the wood post, the sleeve is embedded in the bolt hole on the beam-post connection node; after the bolt passes through the sleeve, the sleeve is pressed by the gasket through a stretch-draw bolt, so that the sleeve pushes against the steel filling plates to generate larger pressure, friction generated by pressure is utilized for shear resistance and the increasing and decreasing of pressure stress is utilized for bending resistance. The connection node is definite in force transfer and convenient for construction, and gaps at the nodes almost have no influence on the load-carrying property and rigidity of the structure; in addition, the introduction of the sleeve can also prevent the local bearing damage of the wood below the gasket and reduce the contact pressure stress at the bolt of the wood beam (post), thus being beneficial to the exertion of strength of the wood. Compared with the existing connection mode, the connection node of the beam-post wood frame has large and stable bending-resistant rigidity.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a beam-column-steel-fill-plate bushing bolt connection node of a wooden structure. Background technique [0002] At present, in the wooden beam-column structure system, due to the large cross-sectional size of the wooden beam-column, the joint form of bolt connection is generally adopted. The common form is the bolt connection joint of steel filler plate and wood member. This joint form is to insert the steel filler plate into the groove of the wooden beam (column) and connect it with bolts. It mainly uses the bending resistance of the bolt and the strength of the wood at the bolt hole. Local pressure to provide bearing capacity. This node form mainly has the following problems: [0003] (1) Due to normal construction deviation, the bolt holes on the wooden beams (columns) cannot be completely aligned with the center of the bolt holes on the steel filler p...

AI Technical Summary

Problems solved by technology

[0003] (1) Due to normal construction deviation, the bolt holes on the wooden beams (columns) cannot be completely aligned with the center of the bolt holes on the steel filler plate. There must be a gap between the screw hole wall and the bolt, and this gap will cause the bolt to be stressed. The contact is not uniform and causes the bolt to slide after being stressed to reduce the bending stiffness of the connection, or make the bending stiffness of the connection unstable as the construction quality changes

[0004] (2) Bolts are stressed as ordinary bolts, and are often damaged due to bending, which is very unfavorable for fully exerting the connection strength of bolts, resulting in low structural connection efficiency

[0005] (3) The bolts are directly extruded with the wood at the side of the screw hole, or even cross-grained, the pressure is high, so the screw hole is easy to plastically deform, so that the hysteretic curve of the node is pinched under the action of cyclic load, and the seismic performance is reduced

[0006] The above problems will cause the bending stiffness of the joints of wood beam-column-steel filler bolts to be small

Engineering practice and experiments have proved that this joint form cannot be considered as a rigid connection in the design. Even if it is considered as a semi-rigid connection, the stiffness is very limited and unstable.

However, if the beam-to-column joints of the wood frame do not have a stable and good bending stiffness, its use effect will be greatly affected.

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