Vibration-Absorbing Wall with Damped Concrete Slab Joints
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Solution Overview
Problem
Existing building designs fail to consider artificially induced seismic shocks and vibrations, such as those from traffic and industrial activity, leading to structural damage like cracks and fissures.
Innovation Solution
A vibration and oscillation absorbing wall composed of two reinforced concrete slabs bonded with damping slabs and 'U' clips, using damping materials to prevent vibration transmission, and installed in an earth trench with a sand bed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforced concrete slabs are rigidly joined together, then structural strength and stability are improved, but vibration transmission between slabs increases
Solution Approach 1:
A damping element is introduced as an intermediary component between adjacent reinforced concrete slabs. This damping element serves as a mediator that mechanically connects the slabs while simultaneously absorbing and dissipating vibration energy, preventing direct rigid contact that would transmit vibrations. The damping element is positioned in the joint region between slabs and is configured to deform under vibrational loads, converting mechanical vibration energy into heat energy through internal friction.
Solution Approach 2:
The mechanical properties of the joint between slabs are changed by introducing a damping element with specific viscoelastic properties. The damping element's stiffness, damping coefficient, and energy dissipation characteristics are optimized to provide adequate structural connection while maximizing vibration absorption. The parameters of the damping element (such as material composition, geometry, and mounting configuration) are adjusted to achieve the desired balance between structural integrity and vibration isolation.
2Object-affected harmful factors
If damping elements are added between slabs, then vibration absorption is improved, but device complexity increases
Solution Approach 1:
The wall structure is segmented into modular reinforced concrete slabs with standardized damping elements positioned at specific intervals. Each slab-damping element assembly functions as a semi-independent module, allowing for simplified manufacturing, transportation, and installation. The damping elements are positioned only at critical joint locations rather than continuously throughout the structure, reducing overall complexity while maintaining effective vibration absorption.
Solution Approach 2:
The damping elements are designed as relatively simple, cost-effective components that can be easily replaced if needed. Rather than using complex, expensive vibration isolation systems, the invention employs straightforward damping elements with adequate service life for typical wall applications. This approach prioritizes functional effectiveness and ease of installation over long-term durability of the damping elements themselves.
3Stability of the object's composition
If slabs are joined with multiple connection elements, then structural stability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The damping elements are pre-positioned within formwork or mounting fixtures before the concrete slabs are installed. This preliminary positioning ensures that the damping elements are correctly located and oriented prior to slab placement, compensating for potential variations in slab dimensions or installation tolerances. The damping elements are configured to accommodate minor misalignments while maintaining effective vibration absorption functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively absorbs artificially induced vibrations and seismic shocks, reducing structural damage by preventing vibration transmission between slabs.
Implementation Method 1
lower damping slab 2 and the upper damping slab 3 are bonded in single layer on the inner side of each reinforced concrete slab 1, 1a
Implementation Method 2
The damping slabs are made of polyurethane elastomer with mixed types of pores of different thickness and resistance depending on their location
Implementation Method 3
At least one 'U' clip is installed on the lower edge of the reinforced concrete slab, which is not rigidly joined with the armouring structure and whose main function is to prevent the slabs from separating from each other
Implementation Method 4
The armouring structure is reinforced with the group of straight and bent bars at the point between the lower nuts installed on the flat side of the reinforced concrete slab and the pair of nuts on the lower edge of the reinforced concrete slab
Implementation Method 5
The vibration and oscillation absorbing wall is placed in the earth trench on the sand bed and subsequently the backfill is made around it
Data Source
Figure 1
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AI summary
The vibration and oscillation absorbing wall is formed by two reinforced concrete slabs (1,1a), wherein on each reinforced concrete slab (1, 1a), a lower damping slab (2) and an upper damping slab (3) are bonded to each other in single layer on the inner side above each other, and these reinforced concrete slabs (1, 1a) are bonded to each other by the lower damping slab (2) and the upper damping slab (3), then the reinforced concrete slabs (1, 1a) with the lower damping slab (2) and the upper damping slab (3) have offsets (4) on the sides, wherein the joining of the reinforced concrete slabs (1, 1a) is made by means of at least one "U" clip (13) separated by damping material (14) from the side wall (1, 1a).