Investigation of seismic coefficient factor for divergent bracing frame with tadas damper utilizing the fema p695
By: Sedaghatnezhad,Hadi
.
Contributor(s): Fallah, Ahmadali.
Publisher: USA Springer 2022Edition: Vol.103(1),Mar.Description: 263-270p.Subject(s): Humanities and Applied SciencesOnline resources: Click here
In:
Journal of the institution of engineers (India): Series ASummary: Braced frames are normally used as ancillary lateral load resisting systems in engineering. The TADAS damper (Triangular Added Damping and Stiffness) has an important effect on energy absorption. Design of TADAS frame structures is based on common design rules and evaluation of design variables which these braced frames need. The design of any structural system requires seismic performance factors such as of coefficient Factor (R), over-strength factor (Ω) and displacement amplification factor (Cd), the coefficient Factor R = 8 was obtained for Chevron brace frame with TADAS damper for this study. Also, the over-strength factor was calculated Ω0 = 2. and displacement amplification factor was calculated Cd = 4.0. The logical method implemented in the Federal Emergency Management Agency (FEMA) P695 is used to determine the quantity of these variables based on the probability of structural failure and includes nonlinear static analysis and dynamic analysis. In order to achieve over-strength and period-based ductility, nonlinear static analysis is performed. An incremental dynamic analysis is then performed to assess the CMR for different models. The different effects of the ground acceleration spectrum are considered for each model in CMR values to obtain an adjusted CMR (ACMR). Calculated values of ACMRs in areas compared to the appropriate values of FEMA P695 for probabilistic evaluation of seismic performance factors of TADAS systems and the results show that the calculated ACMR values and coefficient factor for TADAS steel system is 8, also the results show that ductility and energy absorption have increased with TADAS system.
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School of Engineering & Technology Archieval Section | Not for loan | 2023-0137 |
Braced frames are normally used as ancillary lateral load resisting systems in engineering. The TADAS damper (Triangular Added Damping and Stiffness) has an important effect on energy absorption. Design of TADAS frame structures is based on common design rules and evaluation of design variables which these braced frames need. The design of any structural system requires seismic performance factors such as of coefficient Factor (R), over-strength factor (Ω) and displacement amplification factor (Cd), the coefficient Factor R = 8 was obtained for Chevron brace frame with TADAS damper for this study. Also, the over-strength factor was calculated Ω0 = 2. and displacement amplification factor was calculated Cd = 4.0. The logical method implemented in the Federal Emergency Management Agency (FEMA) P695 is used to determine the quantity of these variables based on the probability of structural failure and includes nonlinear static analysis and dynamic analysis. In order to achieve over-strength and period-based ductility, nonlinear static analysis is performed. An incremental dynamic analysis is then performed to assess the CMR for different models. The different effects of the ground acceleration spectrum are considered for each model in CMR values to obtain an adjusted CMR (ACMR). Calculated values of ACMRs in areas compared to the appropriate values of FEMA P695 for probabilistic evaluation of seismic performance factors of TADAS systems and the results show that the calculated ACMR values and coefficient factor for TADAS steel system is 8, also the results show that ductility and energy absorption have increased with TADAS system.
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