Structure for improving ductility of fabricated composite structure and construction method

Abstract

The invention belongs to the field of structural engineering, and particularly relates to a structure for improving ductility of a fabricated composite structure and a construction method. The structure is composed of a prefabricated defect block (1), a locally hollowed reinforced concrete slab (2), a shear connector (3), an FRP profile (4), a post-cast UHPC (5) and a chemical adhesive (6). The prefabricated defect block (1) is arranged in the locally hollowed reinforced concrete slab (2) and is connected with the FRP section bar (4) through the shear connecting piece (3) and the chemical adhesive (6). By means of the prefabricated defect blocks (1) and the post-cast UHPC (5), the bearing capacity and the overall rigidity of the structure are improved, meanwhile, the assembly type structure is connected more tightly in the pressing process, and ductility is remarkably enhanced. The locally hollowed reinforced concrete slab (2) can be used as a template of the post-cast UHPC (5), so that the cost is saved, the construction difficulty is reduced, and the technicality and the operability are high.

Description

technical field [0001] The invention belongs to the technical field of structural engineering, and particularly relates to a structure and a construction method for improving the ductility of an assembled composite structure. Background technique [0002] (1) The existing composite structure failure mode is brittle failure [0003] At present, traditional building structures have been basically finalized, and breakthroughs in structural performance will depend on the application of new materials. Fiber reinforced polymer (FRP) has the advantages of high specific strength, high specific modulus and high durability. It is widely used in strengthening concrete structures, and has developed rapidly in FRP profile-concrete composite structures. FRP profile-concrete composite beam / slab is a reasonable structural form of FRP and concrete combination, which gives full play to the high compressive strength of concrete and the good tensile capacity of FRP material, and achieves the e...

AI Technical Summary

Problems solved by technology

[0004] (2) Shear connectors are easy to corrode

In the shear connectors of FRP-concrete composite structures, the commonly used metal studs have the advantages of certain ductility, high bearing capacity, and convenient construction, but the metal bolts are prone to corrosion during long-term use, especially under fatigue loads. Corrosion is more serious under the action and harsh environment

When the bolts are corroded, it will not only affect the connection performance between FRP and concrete, so that the mechanical performance of the FRP-concrete composite beam / slab structure will be greatly reduced, but also the corrosion of the metal bolts will destroy the concrete and change the performance of the concrete.

[0006] (3) The construction period of cast-in-place ordinary concrete is long and the durability is poor

However, cast-in-place ordinary concrete also has its own shortcomings that are difficult to overcome, such as heavy weight and poor durability. There are many construction procedures, cast-in-place concrete needs maintenance, long construction period, and extensive use of formwork, etc.

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