Design method and device for reducing use amount of lower chord steel bars of laminated slab and terminal

By constructing a target equilibrium equation to optimize the ratio of upper and lower chord steel bars, a composite carbon fiber reinforced thin concrete flat steel truss composite slab was designed. This solved the problem of unreasonable steel bar usage in traditional composite slabs, reduced costs, and improved building space utilization and mechanical properties.

CN120654298APending Publication Date: 2025-09-16SHENZHEN OBO ENG DESIGN CONSULTANTS CO LTD
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Patent Information

Application Number
CN202510738565.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-04
Publication Date
2025-09-16

AI Technical Summary

Technical Problem

The unreasonable ratio of upper and lower chord steel bars in traditional concrete composite slabs leads to high material and construction costs, and the fixed thickness of the prefabricated layer limits the building space utilization and mechanical properties.

Method used

By constructing the target equilibrium equation and obtaining the target relationship, the diameter of the lower chord steel bar of the target reinforced truss is designed, the ratio of the upper and lower chord steel bars is optimized, and the composite carbon fiber reinforced thin concrete flat reinforced truss composite plate is used to reduce the amount of lower chord steel bars.

Benefits of technology

It effectively reduces the amount of lower chord steel bars, lowers the production cost of composite slabs, improves component transportation efficiency and mechanical properties, and achieves equivalent replacement of prefabricated floor slabs with cast-in-place structures.

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Abstract

The invention discloses a design method and device for reducing the using amount of lower chord steel bars of a laminated slab and a terminal, and the method comprises the steps that a target balance equation is constructed, and the target balance equation is an axial force balance equation of a plane truss prefabricated bottom plate component in the laminated slab in the construction stage; obtaining a target relational expression based on the target balance equation, wherein the target relational expression represents a cross section size relationship between an upper chord steel bar and a lower chord steel bar of the steel bar truss; and designing the lower chord steel bar diameter of the target steel bar truss based on the target relational expression. According to the method, the cross section size relationship between the lower chord steel bars and the upper chord steel bars of the target steel bar truss is inferred reversely by constructing the target balance equation, so that the dosage ratio of the upper chord steel bars and the lower chord steel bars is more reasonable, the design dosage of the lower chord steel bars of the steel bar truss is effectively reduced, and the production cost of the laminated slab is reduced.
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