Modular Z-C Purlin Assembly for Long-Span Lateral Stability
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Solution Overview
Problem
Existing structural purlins struggle to efficiently overcome large spans and lateral instability, particularly in industrial buildings and sports pavilions, while conventional solutions lack flexibility and efficiency in overlapping and coupling configurations.
Innovation Solution
A modular purlin design combining sigma and C-shaped segments with differing flange dimensions allows overlapping and opposite placement, creating a tubular configuration with longitudinal holes for enhanced rigidity and stability, reducing lateral instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional structural purlins are used to overcome large spans, then the span capability is limited, but using modular overlapping design increases structural complexity
Solution Approach 1:
The purlin is divided into modular segments that can be overlapped and coupled together. Each segment has standardized dimensions and features (longitudinal holes, flange configurations) that enable systematic assembly. This segmentation allows the structure to achieve large spans by combining multiple units while maintaining manufacturing simplicity through standardization.
Solution Approach 2:
The overlapping coupling mechanism allows one purlin segment to be nested within or alongside another segment. The coupling system utilizes the flange structures and longitudinal holes to create an interlocked arrangement where segments are positioned relative to each other in a nested fashion, achieving span extension without proportionally increasing overall structural complexity.
2Adaptability or versatility
If purlins are designed for overlapping capability, then span flexibility improves, but lateral stability deteriorates
Solution Approach 1:
The purlin employs asymmetric flange configurations where the front flange and back flange have different dimensions and orientations. This asymmetry creates a specific coupling geometry that provides lateral stability through the interlocked arrangement of overlapping segments. The asymmetric design ensures that when segments are coupled, they resist lateral movement while still allowing span flexibility through the overlapping mechanism.
Solution Approach 2:
The overlapping coupling system introduces a third dimension to the structural assembly by stacking or layering purlin segments vertically or at angles. This dimensional approach allows the structure to achieve lateral stability through the three-dimensional interlocking of segments rather than relying solely on planar bracing, thereby maintaining span flexibility while improving lateral resistance.
3Stability of the object's composition
If tubular configuration is created by opposing placement, then lateral stability increases, but manufacturing complexity increases
Solution Approach 1:
The tubular configuration is achieved by placing two identical or mirror-image purlin segments in opposition to each other. Each segment is manufactured separately using standardized processes, and their symmetric design allows for simplified production. The modular nature of the segments means they can be manufactured in batches and then assembled into tubular configurations on-site, reducing overall manufacturing complexity.
Solution Approach 2:
The same basic purlin segment design serves multiple functions: it can be used individually for standard spans, coupled with identical segments to form tubular configurations for enhanced lateral stability, or arranged in other configurations as needed. This universality reduces manufacturing complexity by requiring only one basic segment type rather than multiple specialized components for different structural requirements.
4Adaptability or versatility
If longitudinal holes are added throughout the segment, then overlapping flexibility improves, but structural strength deteriorates
Solution Approach 1:
Longitudinal holes are positioned at specific locations along the purlin segment rather than being uniformly distributed. The holes are placed in regions where they minimize impact on overall structural strength while maximizing their utility for overlapping and coupling operations. This selective positioning allows the purlin to maintain adequate strength in critical areas while providing flexibility for assembly in non-critical regions.
Solution Approach 2:
The purlin structure utilizes the combination of the metal material itself and the geometric configuration created by the holes and overlapping segments. The holes are designed to work with the coupling system to create a composite structural behavior where the overlapping arrangement compensates for the material removed by the holes. This approach maintains structural strength through the composite action of the assembled system rather than relying solely on the integrity of individual solid segments.
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a metallic purlin destined to be preferably used in roofs and façades of industrial buildings and other spaces, such as sports pavilions, or covered infrastructures which require beams covering large spans. Having in general a "Z" configuration, the purlin (1) comes from the union, in a single purlin, of two parts of purlins placed in opposite orientation: the purlin in sigma ("Z") and the purlin in C ("[") . The front flap(1-a), equipped with a front edge (1-c), is slightly larger than the back flap (1-b) provided with a back edge (1-d), which allows the flap of one purlin to hermetically fit in the flap of the other. The purlin (1) is provided with holes (2) distributed longitudinally, wherein the screws are tightened (3). The present purlin (1) can be coupled to another equal one, in opposition, giving rise to a tubular configuration and allowing the rotation thereof and successive fittings.