Response surface analysis and optimization of controlled rocking steel braced frames

Moradi, Saber; Burton, Henry

doi:10.1007/s10518-018-0373-1

Cited by 34 publications

(17 citation statements)

References 30 publications

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“…Therefore, great care must be taken in choosing these factors. In recent years, four parameters have been determined as basic factors (Moradi and Burton 2018). In addition, it is important to determine the upper and lower limits of the factors for each rocking steel braced frame, separately.…”

Section: Sensitivity Studymentioning

confidence: 99%

Optimization of relative-span ratio in rocking steel braced dual-frames

Ghasemi

Nezamabadi

Moghadam

et al. 2020

Bull Earthquake Eng

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Controlled rocking concentrically steel braced frame (CR-CSBF) is an earthquake-resisting system that is effectively capable of reducing structural damage after earthquakes and causes resilience in the structure. Post-tensioning (PT) strands and fuse members are two important elements in CR-CBSFs to provide frame self-centering and energy dissipation, respectively. This study firstly purposes to evaluate the nonlinear response history analysis with five different relative-span ratios (A/B = 1.5, 2.0, 2.5, 3.0, 3.5). Various amounts of four parameters consist of the yield strength and modulus of elasticity of the fuse, the initial force of the PT cable, and the gravity load on the rocking column are also considered as design valuable factors in the analysis. Additionally, it is considered to involve the influence of frame height with 3-, 6-and 9-story and earthquake different characteristics. The second aim of the study is to investigate about optimizing the seismic response of CR-CSBFs, in order to determine the optimal A/B for each height of structures. In addition to previous valuable research, this study has taken a more innovational approach and aims to complement them. A statistical multi-objective optimization methodology is used to distinguish the design of the spanning ratio required to minimize the peak story drift ratio (PSD), peak roof displacement (PRD), peak roof acceleration (PRA) and peak base shear (PBS), which are considered seismic response demand factors. The results demonstrate that the optimal relative-span ratio or A/B for the three-story controlled rocking concentrically steel braced dual-frame is equal to 1.5, and for the six-and nine-story frames is equal to 3.5.

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Section: Sensitivity Studymentioning

confidence: 99%

Optimization of relative-span ratio in rocking steel braced dual-frames

Ghasemi

Nezamabadi

Moghadam

et al. 2020

Bull Earthquake Eng

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“…Jia et al [37] suggested rocking dual-steel has trilinear hysteretic behavior and lead to mitigation of residual drift as a result of early re-yielding of low-yield point steel. The results of Moradi and Burton [38] showed that the seismic response of the controlled rocking steel braced frames do not affect considerably by changing design parameters such as post-tensioned bars modulus of elasticity and strain hardening ratio of the fuses.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Seismic Performance of Improved Rocking Concentrically Braced-frames with Zipper Columns

Sarand¹,

Jalali²

2020

Period. Polytech. Civil Eng.

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Concentrically braced frames (CBFs) as one of well-known stiff and common lateral force resisting systems often show limited ductility capacity under severe earthquakes. This study proposes rocking zipper braced frame (RZBF) to improve the drift capacity of CBFs which is based on combination of rocking behavior and zipper columns. In the RZBF system, rocking behavior permit the braced frame to uplift during the earthquake and then restoring force induced through post-tensioned bars self-center the frame to its initial state.Also, zipper columns can decrease the concentration of damage by distributing the unbalance force at the mid bay over the frame's height. To assess the performance of RZBF, a comparison study is carried out considering CBF, rocking concentrically braced frame, zipper braced frame and RZBF. For this purpose, some frames structures are designed and nonlinear time history analysis conduct under a set of earthquake records. Seismic responses such as roof drift ratio, gap opening at the column-base interface, forces of top story braces and post-tensioned bars are taken into consideration. The results show that the proposed RZBF has better performance among the others and zipper columns can improve the behavior of rocking systems.

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“…They also studied the effect of the post-tension on the improvement of the loading capacity of the I-shaped steel beams under lateral loading. Moradi and Burton [28] compared the theoretical and experimental seismic behavior of the post-tensioned flexural steel frames. El-Zohairy and Salim [29] used the finite element model to study the behavior of the metal cables post-tensioned reinforced steel composite beams.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

Hosseinnejad

Yaghin

Hosseinzadeh

et al. 2021

IJE

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The external post-tension technique is one of the best strengthening methods for reinforcement and improvement of the various steel structures and substructure components such as beams. In the present work, the load carrying capacity of the post-tensioned tapered steel beams with external shape memory alloy (SMA) tendons were studied. 3D nonlinear finite element method with ABAQUS software is used to determine the effects of the increase in the flexural strength, and the improvement of the load carrying capacity. The effect of the different parameters, such as geometrical characteristics and the post-tension force applied to the tendons were also studied in this research. The results revealed that the external posttension with SMA tendons in comparison with the steel tendons caused a significant improvement of the loading capacity. According to this, using SMA tendon for the reinforcement of the tapered beams resulted in a decrease in weight of these structures and as a consequence responded economic benefits in their application. This method can be used extensively for steel beams due to low executive costs and simplicity of the operation for post-tension.

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Response surface analysis and optimization of controlled rocking steel braced frames

Cited by 34 publications

References 30 publications

Optimization of relative-span ratio in rocking steel braced dual-frames

Optimization of relative-span ratio in rocking steel braced dual-frames

Evaluation of Seismic Performance of Improved Rocking Concentrically Braced-frames with Zipper Columns

Numerical Investigation of Response of the Post-Tensioned Tapered Steel Beams with Shape Memory Alloy Tendons

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