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A Study of Progressive Collapse in Moment-Resisting Reinforced Concrete Structures Considering Damping Ratio
https://orcid.org/http://orcid.org/0000-0002-8326-6204
The damping ratio of reinforced concrete structure cannot be considered as a constant value, and some parameters such as increasing the age of the structure, the corrosion of the reinforcements, and the ground motion amplitude can significantly change the damping ratio. This study investigates the effect of the damping ratio on dynamic increase factor (DIF) against sudden column removal of structures in terms of progressive collapse. To this end, various reinforced concrete structures with moment-resisting frames and regular rectangular plans with different stories and span lengths were designed based on ASCE7 and ACI318-14 in SAP2000. Several column removal scenarios were examined in various locations of the structures by the alternate load path method, and several nonlinear dynamic and static analyses were performed to achieve the data points. Four different curves were fitted to the extracted data points using SPSS, and four modified empirical equations were derived for DIF at damping ratios of 1%, 5%, 10%, and 15%. The difference between the curves shows the impact of the damping ratio on the DIF. In order to integrate four equations, an empirical equation was derived to estimate DIF, including the damping ratio. Moreover, the effect of some other parameters such as the beam span lengths and the location of column removal in the stories and plan on the DIF was investigated and discussed. The equation proposed by the guidelines for DIF provides underestimated and upper estimated values for the DIF in the structures with damping ratios, respectively, less than 5% and higher than 5% because this equation does not include the effect of the damping ratio. Therefore, the derived equation in this research can be suggested as an alternative to the equation proposed by the guidelines.
A Study of Progressive Collapse in Moment-Resisting Reinforced Concrete Structures Considering Damping Ratio
https://orcid.org/http://orcid.org/0000-0002-8326-6204
The damping ratio of reinforced concrete structure cannot be considered as a constant value, and some parameters such as increasing the age of the structure, the corrosion of the reinforcements, and the ground motion amplitude can significantly change the damping ratio. This study investigates the effect of the damping ratio on dynamic increase factor (DIF) against sudden column removal of structures in terms of progressive collapse. To this end, various reinforced concrete structures with moment-resisting frames and regular rectangular plans with different stories and span lengths were designed based on ASCE7 and ACI318-14 in SAP2000. Several column removal scenarios were examined in various locations of the structures by the alternate load path method, and several nonlinear dynamic and static analyses were performed to achieve the data points. Four different curves were fitted to the extracted data points using SPSS, and four modified empirical equations were derived for DIF at damping ratios of 1%, 5%, 10%, and 15%. The difference between the curves shows the impact of the damping ratio on the DIF. In order to integrate four equations, an empirical equation was derived to estimate DIF, including the damping ratio. Moreover, the effect of some other parameters such as the beam span lengths and the location of column removal in the stories and plan on the DIF was investigated and discussed. The equation proposed by the guidelines for DIF provides underestimated and upper estimated values for the DIF in the structures with damping ratios, respectively, less than 5% and higher than 5% because this equation does not include the effect of the damping ratio. Therefore, the derived equation in this research can be suggested as an alternative to the equation proposed by the guidelines.
A Study of Progressive Collapse in Moment-Resisting Reinforced Concrete Structures Considering Damping Ratio
https://orcid.org/http://orcid.org/0000-0002-8326-6204
The damping ratio of reinforced concrete structure cannot be considered as a constant value, and some parameters such as increasing the age of the structure, the corrosion of the reinforcements, and the ground motion amplitude can significantly change the damping ratio. This study investigates the effect of the damping ratio on dynamic increase factor (DIF) against sudden column removal of structures in terms of progressive collapse. To this end, various reinforced concrete structures with moment-resisting frames and regular rectangular plans with different stories and span lengths were designed based on ASCE7 and ACI318-14 in SAP2000. Several column removal scenarios were examined in various locations of the structures by the alternate load path method, and several nonlinear dynamic and static analyses were performed to achieve the data points. Four different curves were fitted to the extracted data points using SPSS, and four modified empirical equations were derived for DIF at damping ratios of 1%, 5%, 10%, and 15%. The difference between the curves shows the impact of the damping ratio on the DIF. In order to integrate four equations, an empirical equation was derived to estimate DIF, including the damping ratio. Moreover, the effect of some other parameters such as the beam span lengths and the location of column removal in the stories and plan on the DIF was investigated and discussed. The equation proposed by the guidelines for DIF provides underestimated and upper estimated values for the DIF in the structures with damping ratios, respectively, less than 5% and higher than 5% because this equation does not include the effect of the damping ratio. Therefore, the derived equation in this research can be suggested as an alternative to the equation proposed by the guidelines.
A Study of Progressive Collapse in Moment-Resisting Reinforced Concrete Structures Considering Damping Ratio
Iran J Sci Technol Trans Civ Eng
Khosravi, Mohammad Reza (author) / Mohammadizadeh, Mohammad Reza (author) / Saffari, Hamed (author) / Torkzadeh, Peyman (author)
2024-10-01
15 pages
Article (Journal)
Electronic Resource
English
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