Prestressed partially-encased steel T-shaped composite beam and construction method thereof

Abstract

The invention provides a prestressed partially-encased steel T-shaped composite beam. Based on a prestressed prefabricated assembly technology, the prestressed partially-encased steel T-shaped composite beam is mainly composed of a prestressed prefabricated rectangular composite beam and a cast-in-place concrete flange plate. The prestressed prefabricated rectangular composite beam comprises honeycomb profile steel, tie bars, closed stirrups, first in-beam longitudinal bars, second in-beam longitudinal bars, a plurality of prestressed steel strands, prefabricated UHPC (Ultra High Performance Concrete) and studs, wherein the tie bars are arranged in holes of the honeycomb profile steel and are perpendicular to a web of the profile steel; the closed stirrups are arranged between flanges of the honeycomb profile steel; the first in-beam longitudinal bars are arranged at the inner bottoms of the closed stirrups and are parallel to the beam length direction; the second in-beam longitudinal bars are arranged at the inner tops of the closed stirrups and are parallel to the beam length direction; the prestressed steel strands are arranged on the upper portions of the lower flanges of the honeycomb profile steel and are parallel to the beam length direction; the prefabricated UHPC is arranged between the flanges of the honeycomb profile steel in a filling mode; and the studs are arranged at the tops of the upper flanges of the honeycomb profile steel. The cast-in-place concrete flange plate comprises double-layer bidirectional steel bars and cast-in-place concrete, wherein the double-layer bidirectional steel bars are arranged in a cast-in-place flange plate body, and the cast-in-place concrete is arranged at the top of the prestressed prefabricated rectangular composite beam in a filling mode. The prestressed partially-encased steel T-shaped composite beam is excellent in stress performance, the crack resistance and flexural rigidity of the beam can be obviously improved, on-site construction is convenient and fast, and the construction period is shortened.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a prestressed partially steel-clad T-shaped composite beam and a construction method thereof. Background technique [0002] With the rapid development of the economy, high-rise, super-high-rise and large-span space structures continue to increase, and the load on the components increases exponentially. In order to meet the load-bearing requirements of the main structure, the cross-sectional size of the components needs to be increased to meet the needs, which increases The self-weight of the main structure affects the spatial layout and aesthetics and reduces the seismic performance, which is not conducive to the development of green and environmentally friendly buildings. [0003] Applying prestressing to steel-concrete composite beams can effectively solve the problems of low cracking and insufficient rigidity of beams in long-span structures. However, traditio...

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Problems solved by technology

[0004] In order to overcome the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of prestressed partially outsourcing steel T-shaped composite beam and its construction method, based on the prestressed prefabricated assembly technology, it solves the complex problem of traditional prestressed structure on-site construction, At the same time, it has the advantages of high bearing capacity, good crack resistance, high rigidity, small component cross-sectional size, and small self-weight.

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