Door Frame Structure with Movable Joints for Seismic Deformation Control
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Solution Overview
Problem
Existing door frame structures are prone to deformation and fracture during earthquakes due to low rigidity, which can prevent doors from being opened and pose safety risks, and they require complex mounting processes.
Innovation Solution
The door frame structure incorporates recessed groove portions and reinforcing members with projections to enhance rigidity, allowing for easy assembly and integration of frame bodies, while sliding reinforcing members prevent deformation during earthquakes, enabling door operation even in emergency situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the door frame structure is firmly mounted to the wall using welding, adhesion, or caulking, then the mounting reliability is improved, but the structure becomes prone to plastic deformation and diamond-shape distortion during earthquakes due to rigid connection with the moving skeleton
Solution Approach 1:
The door frame structure is designed with movable joints between frame members, allowing the structure to dynamically adapt to earthquake-induced wall movements. The frame members can rotate and shift relative to each other, transforming the rigid structure into a semi-flexible system that absorbs seismic energy while maintaining door functionality.
Solution Approach 2:
The patent changes the connection parameters from fixed rigid joints to movable joints with controlled degrees of freedom. This allows the structure to maintain stability under normal conditions while accommodating large deformations during earthquakes, effectively changing the structural response characteristics.
2Reliability
If the frame members are made movable to absorb contact pressure during earthquakes, then the door can be opened after deformation, but the rigidity of the door frame structure becomes very low
Solution Approach 1:
The door frame is divided into multiple independent frame members (left vertical member, right vertical member, top horizontal member) that are connected through movable joints. This segmentation allows each member to move independently, absorbing deformation energy while maintaining overall structural integrity and sufficient rigidity.
Solution Approach 2:
The movable joints between frame members provide controlled flexibility, allowing the structure to adapt to earthquake deformations. The joints enable relative movement while maintaining connection, providing both flexibility for deformation absorption and sufficient rigidity for normal door operation.
3Ease of manufacture
If the door frame structure is firmly mounted to the wall, then the mounting process is simple, but the structure cannot accommodate relative story displacement during earthquakes and may trap inhabitants
Solution Approach 1:
The door frame structure incorporates movable joints that allow dynamic response to earthquake-induced wall movements. The frame members can rotate and shift relative to each other, enabling the structure to accommodate large deformations while maintaining door operability for emergency evacuation.
Solution Approach 2:
The frame is segmented into multiple members connected by movable joints, allowing each segment to move independently during earthquakes. This segmentation provides deformation capacity while maintaining overall structural integrity and simple mounting procedures.
Data Source
AI summary
[Object] To provide a door frame structure and a method for mounting the door frame structure which improve rigidity, prevent deformation that is caused by relative story displacement of a building in the event of an earthquake, and enable easy mounting.[Solution Means] A door frame structure 1 is indirectly mounted to a wall surface 4 via mounting angles 11 fixed to the first reinforcing members 9. Therefore, the door frame structure 1 does not follow relative story displacement of the wall surface 4 caused by lateral vibration in the event of an earthquake, so that deformation of the door frame structure 1 is minimized, and a door 31 can be opened and closed even in an emergency.