The effect of ductility on the seismic collapse risk of residential steel moment-resisting frames at Alborz and Zagros Seismic zones, Iran Ali Jafari, Elham Rajabi, Gholamreza Ghodrati Amiri, Seyed Ali Razavian Amrei Sustainable and Resilient Infrastructure, 2022 In this paper, seismic hazard curves are selected for four different sites at Alborz and Zagros seismic zones with underlying conditions of soft and hard soil. Three residential steel moment-resisting frames (SMRFs) with 3, 5, and 7 stories are designed and modeled for each site to perform cloud analysis, implementing more than 300 far-field as-recorded ground motions. Using the results of regression-based cloud analysis, robust fragility curves are developed for each SMRF, and by combining the fragility curve with the hazard curve, the annual rate of collapse (i.e., collapse risk) is calculated for each SMRF. Furthermore, the important levels of peak ground acceleration (PGA) that greatly contribute to the collapse risk of each SMRF are obtained by exploiting the collapse deaggregation curves, which are composed up of fragility curves, derivative of hazard curves, and the annual rates of collapse. It was found that a strong correlation exists between ductility and the collapse risk of SMRFs at both seismic zones and underlying soil conditions, where increasing the ductility of SMRFs results in a decreased risk of collapse. It was also found that the important levels of the PGA contributing to the collapse risk of the SMRFs are inclined towards greater values as the ductility increases. The 5-storey SMRFs exhibited the least ductility and the highest collapse risk at both seismic zones and soil conditions, while the 3-storey SMRFs were the most ductile ones with the least risk of collapse.
Seismic performance of steel frames equipped with buckling-restrained braces (BRBs) using nonlinear static and dynamic analyses Gholamreza Ghodrati Amiri, Mahdi Eghbali, Esmaeil Asadian, Seyed Ali Razavian Amrei Journal of Vibroengineering, 2017 The current paper compares the seismic performance of buckling-restrained braced frames (BRBFs) and ordinary concentrically braced frames (CBFs) through nonlinear static and time history analysis. Two groups of BRBFs and CBFs including 5, 10 and 15 story frames are modeled and nonlinear pushover analysis is carried out. To further investigate the performance of frames, a selection of near-fault and far-field ground motion records are used for time history analysis. The results indicate the acceptable seismic performance and conformity of low-rise CBFs with BRB frames under far-field records. However, BRB frames present more satisfying results with regards to inter-story drifts, residual drift responses and energy dissipation in case of near-fault seismic excitations. Moreover, the implementation of BRBs provides better performance against the Basic Safety Earthquake 1 (BSE-1).
Structural health monitoring using optimising algorithms based on flexibility matrix approach and combination of natural frequencies and mode shapes Sh. Zamani Mehrian, S.A. Razavian Amrei, M. Maniat, S.M. Nowruzpour International Journal of Structural Engineering, 2016 In this paper, two methods, including flexibility matrix and combination of natural frequencies and mode shapes, are employed to detect the damage location and its severity by creating objective function, which is defined based on differences between the mathematical model and real structure. The damage of structures is modelled by a reduction in the elasticity modulus of the element. The finite element updating approaches used to make an optimisation problem to minimise objective function. In this study, particle swarm optimisation and charged system search as two novel algorithms are taken to find the best optimisation. A few damaged structures with different scenarios are solved to show superiority of each method over another.
Uniform Hazard spectra for the Iranian city of Shiraz Asian Journal of Civil Engineering, 2014
Probabilistic assessment of PGA and UHS for the ancient city Hamadan, Iran International Journal of Earth Sciences and Engineering, 2013
Peak ground acceleration on bedrock and uniform seismic hazard spectra for different regions of Behbahan, Iran International Journal of Earth Sciences and Engineering, 2012
Peak ground acceleration on bedrock and uniform seismic hazard spectra for different regions of Zanjan, Iran International Journal of Earth Sciences and Engineering, 2012
Seismic velocityand displacement hazard assessment for Tehran, including site effects Asian Journal of Civil Engineering, 2012
Seismic retrofitting and increasing bearing capacity of steel truss railway bridge's deck in Iran 9th US National and 10th Canadian Conference on Earthquake Engineering 2010 Including Papers from the 4th International Tsunami Symposium, 2010
