Self-releasing Structural Assembly for Firewalls
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Solution Overview
Problem
In building structures, existing firewalls face challenges in preventing the spread of fire when structural members like joists or floors catch fire, as they are not designed to release from the firewall without compromising its integrity, potentially leading to firewall damage and increased fire spread.
Innovation Solution
A break-away connector system comprising a support member and a fusible member, where the fusible member has a lower melting point than the support member, allowing the structural components to slide and release from the firewall when heated, thereby maintaining the firewall's integrity and allowing time for firefighters to act and occupants to evacuate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If structural members are permanently fixed to the firewall, then structural stability is improved, but the firewall integrity is compromised when fire spreads to adjacent spaces
Solution Approach 1:
The connection system transitions from a static permanent fixation to a dynamic release mechanism. The fusible member maintains normal structural connection under ordinary conditions but automatically melts and releases the structural member when exposed to fire temperatures, allowing the system to adapt its state based on thermal conditions.
Solution Approach 2:
The material properties of the fusible member change dramatically with temperature. At normal temperatures, the fusible member maintains sufficient strength to hold the structural member in place. When temperature increases due to fire, the material undergoes phase change from solid to liquid, fundamentally altering its mechanical properties and enabling automatic release.
2Reliability
If fusible member is used to allow release during fire, then firewall integrity is maintained, but structural stability under normal conditions is reduced
Solution Approach 1:
Only the fusible member is designed with temperature-sensitive properties, while the support member and structural member maintain their normal structural integrity. The fusible member is specifically positioned at the connection point where thermal degradation is desired, allowing localized response to fire conditions without compromising overall structural stability.
3Object-affected harmful factors
If breaking away connector is used to separate structural members from firewall, then fire spread is prevented, but device complexity increases
Solution Approach 1:
The fusible member automatically detects and responds to fire conditions through its inherent thermal properties. When temperature reaches the melting point, the material self-activates the release mechanism without requiring external detection systems, control mechanisms, or human intervention. The system uses the fire's own thermal energy to trigger the release.
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
The system effectively separates the structural components from the firewall during a fire, allowing the firewall to remain intact longer, reducing the risk of fire spread and providing time for emergency responses.
Implementation Method 1
The fusible member has a lower melting point than the support member. When the fusible member is weakened by heat, the floor or ceiling is slidably releasable from the support member.
Data Source
AI summary
The end of a transversely extending beam is joined to a wall structure by a self-releasing structural assembly. It has a first portion anchored to the wall. A second, fireproof and non-thermally degradable portion of the assembly sticks out from the wall. The assembly has a thermally degradable member mated to the second portion of the structural assembly. Both portions have slots for accepting beam fasteners. The beam fasteners squeeze the end of the beam, the support bracket seat, and the consumable, thermally degradable member in compression. When exposed to heat or flame the consumable, thermally degradable member softens, releasing the tension in the beam end fasteners, and releasing the compression in the structural sandwich of parts. The end of the beam is then able to translate away from the wall structure. The consumable member can be inspected without removing the beam end from the seat.