Friction Energy Dissipation Column for Bi-directional Seismic Deformation
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Solution Overview
Problem
Pier-type dampers in building structures often fail due to out-of-plane deformation during seismic events, leading to strain concentration and reduced energy dissipation effectiveness, especially when metal dampers are used.
Innovation Solution
A friction energy dissipation column with cantilever I-shaped steel columns, a middle I-shaped steel column, friction energy dissipation assemblies, and pin shaft connectors, which allows for bi-directional deformation and multi-stage energy dissipation, reducing strain concentration and out-of-plane damage by using a combination of rigid and flexible connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If pier-type dampers are used with metal dampers, then energy dissipation capacity is improved, but out-of-plane deformation causes strain concentration and reduces reliability
Solution Approach 1:
The column is divided into multiple segments (first column segment, second column segment, third column segment) connected by connection nodes. This segmentation allows each segment to independently deform and dissipate energy, preventing strain concentration while maintaining high energy dissipation capacity through the friction energy dissipation assemblies at each connection node.
Solution Approach 2:
The invention introduces out-of-plane deformation capability to the traditional in-plane pier-type damper system. By allowing the column segments to rotate and deform in the out-of-plane direction at the connection nodes, the system can accommodate bi-directional seismic actions without causing strain concentration in the metal damper, thus improving reliability while maintaining energy dissipation capacity.
2Stability of the object's composition
If pier-type dampers are designed with sufficient out-of-plane stiffness, then out-of-plane deformation is reduced, but the damper cannot effectively dissipate energy through rigid body rotation
Solution Approach 1:
The connection nodes are designed with friction energy dissipation assemblies that allow controlled dynamic deformation. The friction plates and friction angles create a dynamic system where the connection nodes can rotate and deform in the out-of-plane direction under seismic loading, enabling the damper to dissipate energy through rigid body rotation while maintaining sufficient out-of-plane stiffness to prevent excessive deformation.
Solution Approach 2:
The invention changes the stiffness parameters of the connection nodes by introducing friction energy dissipation assemblies. The friction plates and friction angles create a variable stiffness system that can adapt to different loading conditions, allowing the connection nodes to maintain sufficient out-of-plane stiffness for stability while enabling controlled deformation for energy dissipation.
3Power
If metal dampers are used in pier-type connections, then energy dissipation capacity is improved, but large inter-story drift causes deformation concentration and reduces low-cycle fatigue performance
Solution Approach 1:
The column is segmented into multiple parts with friction energy dissipation assemblies at the connection nodes. This segmentation distributes the deformation and energy dissipation across multiple locations, preventing deformation concentration in any single metal damper. Each friction energy dissipation assembly can independently accommodate large inter-story drifts through controlled friction sliding, protecting the metal dampers from excessive strain and improving their low-cycle fatigue performance.
Solution Approach 2:
The friction energy dissipation assemblies act as intermediary elements between the column segments and the metal dampers. These friction plates and friction angles serve as mediators that absorb and dissipate energy through friction sliding, preventing direct transmission of large deformations and strains to the metal dampers. This intermediary mechanism protects the metal dampers from deformation concentration while maintaining high energy dissipation capacity.
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 solution effectively reduces strain concentration, improves low-cycle fatigue performance, and prevents out-of-plane damage, while occupying minimal space, allowing for efficient seismic energy dissipation and maintaining building functionality.
Implementation Method 1
a friction energy dissipation assembly, comprising a friction plate, a friction angle steel and a triangular stiffener
Data Source
AI summary
A friction energy dissipation column for bi-directional deformation cooperative and multi-stage working, includes two cantilever part I-shaped steel columns, a middle part I-shaped steel column, wherein the middle part I-shaped steel column is located between the two cantilever part I-shaped steel columns, and the middle part I-shaped steel column is detachably connected to the two cantilever part I-shaped steel columns via a pin shaft connector and a friction energy dissipation assembly. An upper end and a lower end web of the friction energy dissipation column are connected to the frame beam via a connecting plate, and the flanges on both sides are provided with haunched supports.