Load-Bearing Panel With Variable Nail Spacing For Seismic Stress Control
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Solution Overview
Problem
Existing load-bearing wooden building structures face challenges in enhancing seismic resistance without generating excessive stress in adjacent frames, leading to potential deformation and damage.
Innovation Solution
A load-bearing panel comprising a rectangular base frame with a composite surface material of stacked wooden plywood and metal plates, where the nail spacing is denser in the center than at the ends, and the metal plate is interposed between the base frame and plywood, with nails arranged in a zig-zag pattern in the center to increase density while maintaining spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the maximum strength of the load-bearing wall is improved by reinforcing the surface material and joining parts, then the shear resistance performance is enhanced, but excessive stress is generated in adjacent building frames leading to potential damage
Solution Approach 1:
The patent applies local quality by varying the nail spacing along the edges of the plywood - denser spacing in center portions and sparser spacing at end portions. This non-uniform distribution optimizes the load-bearing capacity locally while preventing excessive stress concentration at frame connections, thereby resolving the contradiction between enhancing shear resistance and avoiding excessive stress in adjacent frames.
2Strength
If the spacing between nails is reduced to improve the strength of the joining part, then the short age strength against external force increases, but bearing pressure failure of the surface material occurs early due to nailing parts serving as perforations
Solution Approach 1:
The patent implements local quality by applying different nail spacing strategies to different regions: center portions use denser nail spacing to maximize joining strength, while end portions use sparser spacing to prevent bearing pressure failure and perforation. This regional differentiation simultaneously achieves both improved joining strength and enhanced bearing pressure resistance.
3Strength
If a composite surface material with reinforcing board is used to improve seismic resistance, then the total strength of load-bearing wall is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies parameter changes by modifying the nail spacing parameter along the plywood edges rather than changing the fundamental composite structure. This approach achieves improved seismic resistance through optimized connection parameters while avoiding the complexity and cost associated with additional reinforcing materials and multi-layer composite constructions.
Data Source
AI summary
A load-bearing panel and a building frame structure is provided, in which an initial stiffness and a yield strength are enhanced while appropriately reducing the maximum strength after yielding. Thus, it is possible to avoid generating excessive stress in adjacent building frames. The load-bearing panel includes: a rectangular-shaped base frame 2 formed by joining a pair of horizontal base materials 21 and 22 to a pair of vertical base materials 23 and 23; and a composite surface material 3 made of wooden plywood 31 and a metal plate 32 stacked on each other. Four side edges of the composite surface material 3 are attached to a base frame 2 by driving nails. The spacing between the nails in a center part of each side edge in the length direction is smaller than the spacing between the nails in both end parts of the side edge.