Staggered-welding type cast-in-place wrapped castellated beam with web openings

Abstract

The invention discloses a staggered-welding type cast-in-place wrapped castellated beam with web openings. The castellated beam comprises a steel skeleton consisting of main beams and a secondary beam, wherein the main beams and the secondary beam are all produced by I-shaped beams, and the I-shaped beams comprises webs and top flanges and bottom flanges respectively arranged on the upper and lower sides of the webs; each I-shaped beam is cut along a preset fold line on the web of the I-shaped beam into two steel beams with a toothed side edge, and the toothed side edges of the two steel beamsare welded in a staggered way to form the main beam or the secondary beam with the web openings; after the steel skeleton is prefabricated, longitudinal reinforcements and pipelines are arranged on the steel skeleton, wherein lower longitudinal reinforcements and pipelines all penetrate the openings on the webs, upper longitudinal reinforcements pass through the upper parts of the top flanges, concrete is poured after the longitudinal reinforcements and the pipelines are arranged, the steel skeleton is wrapped by the concrete, so that a whole module is formed by the steel skeleton and a reinforced concrete floor. The castellated beam disclosed by the invention has large second moment of area and flexural capacity, and good energy-dissipating capacity under an earthquake load effect.

Description

technical field [0001] The invention relates to the technical field of building components, in particular to a cast-in-place wrapped honeycomb beam with a dislocation-welded web opening. Background technique [0002] my country's annual urban and rural housing area is 2 billion cubic meters, of which more than 80% are high-energy buildings, and the energy consumption per unit building area in my country is more than twice that of developed countries. According to the statistics of the China Iron and Steel Association, my country's steel output reached 800 million tons in 2016, ranking first in the world since 2000. Correspondingly, the current domestic construction industrialization level is less than 10%, while the steel structure construction area in developed countries accounts for the total construction area. More than 50%, Japan accounted for 80%. As the country with the largest construction scale and steel output in the world, China lags behind seriously in the develop...

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Problems solved by technology

[0003] Nowadays, the composite beam floor slabs used in buildings in China mostly adopt the traditional cast-in-place construction method. The steel beams located under the floor slabs are solid-web type, and the amount of steel used is large, resulting in limited beam height. If the flanges are weakened or the webs are opened, further considerations must be made. Instability problems, and the steel beam is easy to rust, not resistant to high temperature, anti-corrosion, fire prevention and other issues are particularly important; the steel beam and the floor slab need to be connected with each other, which consumes manpower and material resources; the composite beam wrapped in concrete, due to the distance between the upper flange of the steel beam It is relatively close, resulting in a very small entrance for conveying concrete, which is inconvenient for construction; most of the pipelines used in the building are under the beam slab, resulting in reduced building headroom and occupying indoor space; under loads such as earthquakes, the floor at the support is the control section. Under negative bending moment, the reinforced concrete is in a state of tension and is prone to damage; in addition, the cross-section of the beam and slab is T-shaped, and the beam height is the sum of the steel beam height h0 and the floor thickness L. The net height of the steel beam h0 cannot be expressed as the beam height. The expression is very confusing

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