Beam upturned joint structure with good crack resistance and its construction method

Abstract

The invention discloses a beam upturned node structure with good crack resistance and a construction method thereof, comprising a constant slab, a constant beam used to support the normal slab, a rising slab higher than the elevation of the normal slab, a beam bottom used to support the rising slab An upturned beam that is flush with the bottom of the regular beam and whose top elevation is higher than that of the regular beam, and a beam support used to connect the upturned beam and the regular beam, the inside of the upturned beam is arranged in sequence along the extension direction of the upturned beam There are several channel steels. The upper and lower flanges of the channel steel face the beam bottom and the beam top of the upturned beam respectively. At the same time, there are pull bolts between the upper and lower flanges. There are holes on the web for the steel bars in the regular plate to pass through. The invention can limit the development of cracks by setting the channel steel, and can help the stirrup to resist the torque caused by the bending moment at the end of the plate to a certain extent; the hole of the channel steel can enhance the connection performance of the plate and beam concrete, and the plate steel bar can pass through this holes to avoid being interrupted.

Description

technical field [0001] The invention relates to an upturned node structure, in particular to a beam upturned node structure with good crack resistance and a construction method thereof. Background technique [0002] In the design of floor slab structure, due to the requirements of construction or equipment specialization, we often encounter the situation of "lifting the slab", that is, it is necessary to raise the structural elevation of a certain floor slab, which is higher than the slab elevation of the normal floor. The beam level connected to the floor slab is raised accordingly. However, if the beam passes through both the slab with normal slab elevation and the slab after the "lifted slab", at this time, the general situation will be to choose the elevation of the beam top at the normal slab surface, and select the beam upturned node at the "lifted slab" method; sometimes the method of folded beams is also chosen, but the folded beams not only have the disadvantages o...

AI Technical Summary

Problems solved by technology

This situation is detrimental to the mechanical performance of the beam

[0005] There is no special anchorage requirement for the longitudinal reinforcement of the upturned joint of the beam at the support, especially when the height of the upturned joint is high, the joint at the end of the beam will crack significantly under the action of negative bending moment, even if the crack does not disappear in a short period of time. Does not affect the safety of the structure, but the steel bars in the upturned joints will rust if they are exposed to the air for a long time

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