Structure and method for anchoring steel strands of prefabricated superposed beams at beam column nodes through pre-tensioning method

Abstract

The invention relates to a structure and method for anchoring steel strands of prefabricated superposed beams at beam column nodes through a pre-tensioning method. The structure comprises a column, superposed beams, a vertical opening tooth-shaped steel plate, a horizontal opening tooth-shaped steel plate and composite stirrups, wherein the superposed beams are arranged on the column and are oppositely arranged in pairs; the end parts of the superposed beams extend out to form steel strand anchoring sections, pier heads are formed at the end parts of the steel strand anchoring sections, the vertical opening tooth-shaped steel plate and the horizontal opening tooth-shaped steel plate penetrate into the steel strand anchoring sections separately, the two steel plates are tightly attached toeach other in a front-and-back manner and abut against the pier heads, and the composite stirrups are bound to the steel strand anchoring sections through steel wires. The structure and the method have the advantages that the problems of mutual collision and stagger of the steel strands, particularly the collision problem of the steel strands of the superposed beams in the intersecting direction can be effectively solved.

Description

【Technical field】 [0001] The invention relates to an anchoring structure and an anchoring method, in particular to an anchoring structure and method of a pre-tensioned prefabricated composite beam steel strand at a beam-column node, and belongs to the technical field of construction engineering. 【Background technique】 [0002] Pre-tensioned composite beams generally use steel strands as prestressed tendons, and in order to give full play to the advantages of pre-tensioned composite beams, pre-tensioned composite beams are often used in buildings with large spans and heavy loads , such as multi-storey warehouse buildings, multi-storey logistics buildings. However, the anchoring problem of steel strands used in pre-tensioned composite beams at beam-column joints has not been well resolved. The reason is that according to the requirements of seismic codes, the anchorage length of steel strands is proportional to its design strength. The anchorage length required by high-streng...

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Problems solved by technology

However, the anchoring problem of steel strands used in pre-tensioned composite beams at beam-column joints has not been well resolved. The reason is that according to the requirements of seismic codes, the anchorage length of steel strands is proportional to its design strength. The anchorage length required by high-strength steel strands will often exceed the cross-sectional size of the deep column; in addition, the large-span and heavy-load characteristics of buildings used in pre-tensioned prefabricated composite beams also determine the anchorage used in the lower part of composite beams. There are a large number of steel strands, often with 3 rows and nearly 20 strands, so the steel strands connected to the same column and opposite prefabricated composite beams in the same direction will have serious collisions, such as If the steel strand is bent and anchored, the collision will be more serious

On the one hand, this kind of collision will cause misalignment and even rollover of the composite beam assembled first due to the collision of the steel strands of the composite beam assembled later when assembling the composite beam. On the other hand, the overlapping steel strands At the same time, it will also seriously affect the bite between the concrete and the steel strand, and affect the anchoring effect of the steel strand

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