Roof Slab Bracket Design for Wind Uplift and Dilation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing roof covering systems for buildings face challenges in increasing the span between slab rests, enhancing wind resistance, allowing for free longitudinal dilation of slabs, reducing profile bends for cost-effectiveness, and preventing material cracking or color whitening, while maintaining resistance to lateral and extraction stresses without increasing friction.
Innovation Solution
A metal roofing system comprising metal slabs connected by specially shaped lateral edges and fixed using brackets that allow for long-lasting, wind-resistant, and easy installation, with a design that minimizes bends and facilitates free dilation, using hard metal alloys and a unique bracket system that prevents piercing and maintains seal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the span between slab rests is increased to reduce the number of brackets and simplify installation, then ease of operation and productivity are improved, but wind resistance and mechanical performance at concentrated loads deteriorate
Solution Approach 1:
The bracket is divided into multiple functional zones: a first zone with gripping elements for lateral retention, a second zone with fixing elements for vertical anchoring, and a third zone with drainage features. This segmentation allows each zone to optimize for its specific function while working together to provide overall structural performance.
Solution Approach 2:
The bracket design incorporates three-dimensional geometric features including angled gripping surfaces, vertical fixing elements, and drainage channels positioned at different heights and orientations. This multi-dimensional approach distributes wind loads across multiple planes and prevents stress concentration.
2Strength
If brackets are used to fix slabs to the underlying structure, then wind resistance and mechanical performance are improved, but device complexity and installation time increase
Solution Approach 1:
The bracket integrates multiple functions into a single component: lateral gripping, vertical fixing, drainage, and positioning features are all combined in one piece. This eliminates the need for separate components for each function and simplifies the overall assembly process.
Solution Approach 2:
The bracket is designed as a multi-functional element that simultaneously provides mechanical retention, structural fixing, water drainage, and thermal expansion accommodation. This universal design reduces the total number of components needed in the roofing system.
3Strength
If the frequency of fixings in the lengthwise direction is increased to improve wind-uplift resistance, then strength is improved, but ease of manufacture and installation time worsen
Solution Approach 1:
The bracket design concentrates strengthening features at critical locations: the gripping zone and fixing zone are positioned where wind-uplift forces are most significant, while other areas maintain simpler geometries. This localized approach provides maximum strength where needed without unnecessarily complicating the entire component.
4Ease of manufacture
If profiling of lateral edges is simplified to reduce production costs, then ease of manufacture is improved, but wind resistance and mechanical performance deteriorate
Solution Approach 1:
The lateral edges of the slabs feature curved or rounded profiling rather than sharp angular transitions. This curvature distributes stress more evenly during wind events and prevents stress concentration at sharp corners, while the profiling can be efficiently produced using standard rolling or forming techniques.
Data Source
Figure 1~3
Figure 4~5b
Figure 6~8
AI summary
A coating cover with a metal structure for roofs of buildings comprising a plurality of slabs (20) of substantially quadrilateral shape each of which is provided with shaped edges (A, B) that are parallel and opposite to one another intended for mutual connection between slabs (20) that are adjacent in the longitudinal direction and are intended for the formation of a joint (21) positioned between each of the adjacent slabs (20), wherein said shaped edges (A, B) comprise folds (30, 31, 32, 33, 34, 35, 36, 37) at least partially symmetrical on the two edges and further folds (38, 39, 40) that are made on at least one of the shaped edges (A) and further folds (41, 42, 43) that are made on at least one of the shaped edges (B), in which said shaped edges (A, B) comprise curvatures at folds (32, 33, 34, 35) that adapt to the geometries (33, 34, 44, 45) of a bracket (S), adapted to receive said folds of shaped edges (A, B), said base (X) has a conformation defined by a flat surface (60) that rests on the sub-structure of the roof to which it is fixed by fixing elements passing through holes (46), and comprises an inner rotating element (Y) and an external rotating element (Z) that rotate on an axis placed at a cylindrical portion 51y, 51z) thereof around respective cylindrical housings (47, 48) of the base (X).