Ribbed Reinforcing Bar Checkerboard Transverse Protuberances
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Solution Overview
Problem
Existing ribbed reinforcing bars face issues with ovalization during rolling, reduced load-bearing capacity due to uniaxial thrusting forces, and weakened bond strength under dynamic loads, particularly with the presence of longitudinal ribs and intersections, which hinder efficient bonding with concrete and splicing capabilities.
Innovation Solution
A ribbed reinforcing bar with a circular cross-section and inclined open crescent-shaped transverse protuberances arranged in a checkerboard fashion along a spiral line, produced without longitudinal ribs, featuring peaks in inclined axial planes with angles between 20° to 70°, forming a screw thread configuration for enhanced bonding and splicing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If longitudinal ribs are added to the reinforcing bar, then bonding strength with concrete is improved, but cyclic and dynamic load strength is reduced due to stress concentration at intersections
Solution Approach 1:
The patent removes longitudinal ribs from the reinforcing bar design, extracting the harmful element that caused stress concentration at intersections. This eliminates the weakness under cyclic and dynamic loads while maintaining bonding strength through optimized transverse rib configuration with 3-7 ribs per pitch length and inclination angles of 30-60 degrees.
Solution Approach 2:
The patent applies different rib configurations to different regions: transverse ribs with specific inclination angles (30-60°) and densities (3-7 per pitch length) are distributed along the bar length, while eliminating longitudinal ribs entirely. This localized optimization ensures strong bonding without stress concentration points.
2Area of stationary object
If transverse protuberances are arranged in adjacent rows with peaks in mutually perpendicular planes, then coverage area is increased, but longitudinal ribs are formed reducing relative rib area and preventing spiral thread formation
Solution Approach 1:
The patent arranges transverse rib peaks in adjacent rows within the same axial plane rather than in mutually perpendicular planes. This asymmetric arrangement relative to conventional designs prevents the formation of longitudinal ribs, maintains spiral thread formability, and achieves adequate coverage with 3-7 ribs per pitch length.
Solution Approach 2:
The patent changes the spatial arrangement dimension by positioning all transverse rib peaks in the same axial plane rather than distributing them across perpendicular planes. This dimensional reorganization eliminates longitudinal rib formation while maintaining sufficient surface coverage for bonding.
3Strength
If rib inclination angle is increased, then bonding efficiency is improved, but excess stress and notch effect at edges are increased
Solution Approach 1:
The patent optimizes the rib inclination angle parameter to a specific range of 30-60 degrees relative to the bar axis. This parameter optimization balances bonding efficiency with stress distribution, avoiding the excessive stress and notch effects that occur with steeper angles while maintaining effective mechanical bonding.
Data Source
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AI summary
The invention is directed toward the creation of a ribbed reinforcing bar without longitudinal ribs, which provides improved reinforcement for reinforced concrete structures and can also be used as a ground anchor and as a fastening element for formwork and other mechanical connecting and anchoring devices. This technical result is achieved in that a ribbed reinforcing bar has a core with a circular cross-section and inclined crescent-shaped transverse protuberances arranged in four rows over the surface of the bar. In order to allow two-high rolling without the formation of longitudinal ribs, the peaks of the transverse protuberances are arranged in a checkerboard fashion along a spiral line over the entire surface of the core. The peaks of adjacent longitudinal rows of transverse protuberances are situated in inclined axial planes of the bar which lie at angles of from 20° to 70° adjacent to axial planes which coincide with the rolling axes of the bar. The protuberances can be arranged on the surface of the bar such as to form a spiral thread.