Assessment of Higher Modes Effects on Steel Moment Resisting Structures under Near-Fault Earthquakes with Forward Directivity Effect Along Strike-Parallel and Strike-Normal Components

Mashayekhi, A. H.; Gerami, Mohsen; Siahpolo, Navid

doi:10.1007/s13296-019-00229-z

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…To obtain the reliable results of seismic performance assessment for steel SMFs, the cyclic behavior of SMF components has been investigated through experimental and numerical studies [19,20]. However, only a limited number of studies have been conducted for steel IMFs, OMFs, and existing moment frames [21][22][23][24][25][26]. According to the commentary of AISC 341-16 [3], the details of OMFs were developed based solely on the judgement of engineers rather than on the results of experimental and numerical studies.…”

Section: Introductionmentioning

confidence: 99%

Effect of Wind Loads on Collapse Performance and Seismic Loss for Steel Ordinary Moment Frames

2022

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The aim of this study is to investigate the effect of wind loads on the seismic collapse performance and seismic loss for steel ordinary moment frames (OMFs). For this purpose, 9-, 12-, 15-, and 18-story steel OMFs are repeatedly designed for (1) gravity load + seismic load, (2) gravity load + seismic load + wind load (wind speed = 44 m/s), and (3) gravity load + seismic load + wind load (wind speed = 55 m/s). The seismic collapse performance and seismic loss of OMFs are evaluated using the procedures in FEMA P695 (FEMA, 2009) and FEMA P58 (FEMA, 2018), respectively. Steel OMFs designed with consideration of wind loads have larger member sections than corresponding steel OMFs designed without consideration of wind loads as expected. Although member sections are increased when wind loads are considered, the growth in the maximum base shear force and lateral stiffness of OMFs are insignificant. Unlike our expectation, OMFs designed with consideration of wind loads have higher expected annual loss (EAL) than corresponding OMFs designed without consideration of wind loads.

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Section: Introductionmentioning

confidence: 99%

Effect of Wind Loads on Collapse Performance and Seismic Loss for Steel Ordinary Moment Frames

2022

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“…Gerami et al (2013) studied steel moment-resisting frames under near-fault earthquakes with pulse velocities greater than 0.70 s and showed that the effects of forward directivity increased the global and local demands about 1.1-2.6 and 1.2-3.5 times, respectively [19]. Also, Mashayekhi et al (2019) illustrate that the interstory drift angle of structures under near-fault earthquakes with forward directivity effect is greater than far-fault earthquakes for about 30-50% of structure height in upper stories [20].…”

Section: Introductionmentioning

confidence: 99%

A New Empirical Correlation for Estimation of EBF Steel Frame Behavior Factor under Near-Fault Earthquakes Using the Genetic Algorithm

Razavi

Siahpolo

Adeli

2020

Journal of Engineering

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The most important feature of the behavior factor is that it allows the structural designer to be able to evaluate the structural seismic demand, using an elastic analysis, based on force-based principles quickly. In most seismic codes, this coefficient is merely dependent on the type of lateral resistance system and is introduced with a fixed number. However, there is a relationship between the behavior factor, ductility (performance level), structural geometric properties, and type of earthquake (near and far). In this paper, a new and accurate correlation is attempted to predict the behavior factor (q) of EBF steel frames, under near-fault earthquakes, using the genetic algorithm (GA). For this purpose, a databank consisting of 12960 data is created. To establish different geometrical properties of models, 3−, 6−, 9−, 12−, 15, and 20− story steel EBF frames were considered with 3 different types of link beam, 3 different types of column stiffness, and 3 different types of brace slenderness. Using nonlinear time history under 20 near-fault earthquake, all models were analyzed to reach 4 different performance levels. 6769 data were used as GA training data. Moreover, to validate the correlation, 2257 data were used as test data for calculating mean squared error (MSE) and correlation coefficient (R) between the predicted values of (q) and the real values. In addition, the MSE and R were calculated for correlation in the train and test data. Also, the comparison of the response of maximum inelastic displacement of 5 stories EBF from the proposed correlation and the mean inelastic time-history analysis confirms the accuracy of the estimate relationship.

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“…SMAs are a promising alternative for enhancing the seismic performance of MRFs. Mashayekhi et al. (2019) assessed the effects of higher modes on steel moment-resisting structures under near-fault earthquakes with forward directivity.…”

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confidence: 99%

“…SMAs are a promising alternative for enhancing the seismic performance of MRFs. Mashayekhi et al (2019) assessed the effects of higher modes on steel momentresisting structures under near-fault earthquakes with forward directivity. They conducted nonlinear time history analyses on a ten-story steel frame subjected to varying levels of forward directivity.…”

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confidence: 99%

Seismic behaviour of the non-straight steel beams in the structural plans

Rashidiyan,

Mirghaderi,

Mohebbi

et al. 2024

IJSI

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Purpose This research study focuses on investigating the seismic performance of non-straight beams in steel structures and exploring the mechanism by which plastic hinges are formed within these beams. The findings contribute to the understanding of their behaviour under seismic loads and offer insights into their potential for enhancing the lateral resistance of the structure. The abstract of the study highlights the significance of corners in structural plans, where non-coaxial columns, diagonal elements or beams deviating from a straight path are commonly observed. Typically, these non-straight beams are connected to the columns using pinned connections, despite their unknown seismic behaviour. Recognizing the importance of generating plastic hinges in special moment resisting frames and the lack of previous research on the involvement of these non-straight beams, this study aims to address this knowledge gap.Design/methodology/approachThis study examines the seismic behaviour and plastic hinge formation of non-straight beams in steel structures. Non-straight beams are beams that connect non-coaxial columns and diagonal elements, or deviate from a linear path. They are usually pinned to the columns, and their seismic contribution is unknown. A critical case with a 12-m non-straight beam is analysed using Abaqus software. Different models are created with varying cross-section shapes and connection types between the non-straight beams. The models are subjected to lateral monotonic and cyclic loads in one direction. The results show that non-straight beams increase the lateral stiffness, strength and energy dissipation of the models compared to disconnected beams that act as two cantilevers.FindingsThe analysis results reveal several key findings. The inclusion of non-straight beams in the models leads to increased lateral stiffness, strength and energy dissipation compared to the scenario where the beams are disconnected and act as two cantilever beams. Plastic hinges are formed at both ends of the non-straight beam when a 3% drift is reached, contributing to energy damping and introducing plasticity into the structure. These results strongly suggest that non-straight beams play a significant role in enhancing the lateral resistance of the system. Based on the seismic analysis results, this study recommends the utilization of non-straight beams in special moment frames due to the formation of plastic hinges within these beams and their effective participation in resisting lateral seismic loads. This research fills a critical gap in understanding the behaviour of non-straight beams and provides valuable insights for structural engineers involved in the design and analysis of steel structures.Originality/valueThe authors believe that this research will greatly contribute to the knowledge and understanding of the seismic performance of non-straight beams in steel structures.

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Assessment of Higher Modes Effects on Steel Moment Resisting Structures under Near-Fault Earthquakes with Forward Directivity Effect Along Strike-Parallel and Strike-Normal Components

Cited by 9 publications

References 14 publications

Effect of Wind Loads on Collapse Performance and Seismic Loss for Steel Ordinary Moment Frames

Effect of Wind Loads on Collapse Performance and Seismic Loss for Steel Ordinary Moment Frames

A New Empirical Correlation for Estimation of EBF Steel Frame Behavior Factor under Near-Fault Earthquakes Using the Genetic Algorithm

Seismic behaviour of the non-straight steel beams in the structural plans

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