Laced Composite System for Blast Resistance
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Solution Overview
Problem
Existing structural systems for resisting suddenly applied dynamic loads, such as blast and impact, are complex, require welding, and have limitations in ductility and rotational capacity, making them unsuitable for economical and user-friendly construction.
Innovation Solution
A laced composite system with cover plates and reinforcing members connected using transverse/cross rods, eliminating the need for welding and enabling continuous shear transfer, which enhances ductility and rotational capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is used to connect steel plates and reinforcing members, then structural strength is improved, but construction complexity and time increase
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a mechanical connection system using transverse bars that pass through apertures in the plates and are secured with nuts and washers. This substitution eliminates the need for welding equipment, skilled welders, and complex welding procedures while maintaining structural integrity through friction and mechanical fastening.
Solution Approach 2:
The patent introduces transverse bars as intermediary elements that connect the reinforcing members to the steel plates. These bars pass through apertures and are secured with nuts and washers, serving as a mediator that transfers loads between components without requiring direct welding, thereby simplifying the construction process while maintaining strength.
2Reliability
If welding is used to connect steel plates, then structural integrity is improved, but installation time and productivity decrease
Solution Approach 1:
The patent employs pre-drilled apertures in the steel plates and pre-fabricated transverse bars with attachment features (nuts and washers). These components are prepared in advance, allowing for rapid assembly on-site without the time-consuming process of welding. The reinforcing members are also pre-bent to fit the aperture pattern, enabling quick installation while maintaining structural integrity.
3Manufacturing precision
If minimum spacing of 200 mm between plates is maintained, then welding quality is improved, but structural design flexibility is reduced
Solution Approach 1:
The patent replaces welding with a mechanical fastening system using transverse bars that pass through apertures and are secured with nuts and washers. This substitution eliminates the minimum 200 mm spacing requirement imposed by welding constraints, allowing plates to be positioned closer together and enabling greater design flexibility for various structural configurations without compromising connection quality.
4Ease of manufacture
If discrete connection points are used between steel plates, then manufacturing simplicity is improved, but shear transfer efficiency deteriorates
Solution Approach 1:
The patent uses continuously bent reinforcing members that pass through multiple apertures in sequence, creating a continuous load path between steel plates. This continuous action of the bent bars through successive apertures ensures efficient shear transfer across the entire connection length, eliminating the discontinuities inherent in discrete connection points while maintaining manufacturing simplicity.
Data Source
AI summary
The present invention relates to a laced composite system with high rotational capacity and ductility which resists the suddenly applied dynamic loads by undergoing excessive plastic deformation, while still maintaining the integrity of the system. The laced composite system comprising, a sandwiched filler material between upper and lower cover plates (1); the said cover plates being provided with the plurality of perforations (2) along the length, plurality of reinforcing members (3) being passed through the said perforations to connect the said cover plates leaving bent edges of the reinforcing members projecting outside the cover plates, plurality of transverse/cross rods (4) being attached at the outer side of the said cover plates through the space available in between the cover plates and bends of the reinforcing members projecting outside the cover plates to hold the said reinforcing members in order to enhance the ductility and rotational capacity of the said laced composite system. This invention has been particularly developed for resisting suddenly applied dynamic loads such as blast, impact, ect.