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Performance evaluation of steel frames with a novel replaceable pipe damper system.

Farshad Taiyari¹, Jamal Roshani²

¹Department of Civil Engineering, Technical and Vocational University (TVU), Tehran, Iran. f-taiyari@tvu.ac.ir.

Scientific Reports

|June 10, 2026

Summary

This study introduces a new brace-type damper system for steel frames, significantly enhancing seismic performance. A first-mode distribution of dampers improves key seismic design factors, offering a more efficient structural solution.

Keywords:

Damper system Dynamic analysis Fragility curve Pipe element Seismic factor Steel frame

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Area of Science:

Structural Engineering
Earthquake Engineering
Materials Science

Background:

Steel moment-resisting frames are critical for seismic resilience.
Existing damper systems require optimization for efficiency and effectiveness.
Novel brace-type damper systems offer potential for improved seismic behavior.

Purpose of the Study:

To investigate the seismic behavior of steel moment-resisting frames with a new brace-type damper system.
To propose seismic design factors for integrating these systems into code-based frameworks.
To evaluate different damper element allocation patterns for optimal performance and material usage.

Main Methods:

Development of structural models in OpenSees, with and without the damper system.
Application of an iterative design method combined with incremental dynamic analysis (IDA).
Evaluation of two pipe element allocation patterns (first-mode-based vs. uniform).
Development of fragility curves to assess damage probability.

Main Results:

The dual systems demonstrated excellent seismic performance.
A first-mode-based distribution of pipe dampers increased the response modification factor by approximately 87% compared to frames without dampers.
Specific seismic design factors (overstrength, response modification, displacement amplification) were quantified for the optimized system.
First-mode distribution proved more effective than uniform allocation, achieving similar performance with reduced material.

Conclusions:

The novel brace-type damper system significantly enhances the seismic resilience of steel moment-resisting frames.
A first-mode-based distribution of replaceable energy-dissipating pipe elements is an effective strategy for optimizing seismic design factors.
This approach offers a more efficient and potentially cost-effective solution for seismic retrofitting and new construction.