Improving the Structural Reliability of Steel Frames Using Posttensioned Connections

Lopez-Barraza, Arturo; Reyes‐Salazar, Alfredo; Ruiz, Sonia E.; Ruiz‐García, Jorge; Formisano, Antonio; Almansa, Francisco López; Carrillo, Julián; Bojórquez, Edén

doi:10.1155/2019/8912390

Cited by 15 publications

(7 citation statements)

References 33 publications

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“…In other words, it is observed that the values of the mean annual rates of exceedance for the RC-BRB systems are smaller than those of the traditional RC buildings. Note that there are other structural systems to improve the seismic reliability of buildings such as posttensioned connections [45]. e results indicate that the use of BRBs in buildings is a good solution in order to reduce peak drift demands of traditional structures located in high seismic zones.…”

Section: Structural Reliabilitymentioning

confidence: 95%

Enhanced Seismic Structural Reliability on Reinforced Concrete Buildings by Using Buckling Restrained Braces

Baca

Bojórquez

Leyva

et al. 2021

Shock and Vibration

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The control of vibrations and damage in traditional reinforced concrete (RC) buildings under earthquakes is a difficult task. It requires the use of innovative devices to enhance the seismic behavior of concrete buildings. In this paper, we design RC buildings with buckling restrained braces (BRBs) to achieve this objective. For this aim, three traditional RC framed structures with 3, 6, and 9 story levels are designed by using the well-known technique nondominated sorting genetic algorithm (NSGA-II) in order to reduce the cost and maximize the seismic performance. Then, equivalent RC buildings are designed but including buckling restrained braces. Both structural systems are subjected to several narrow-band ground motions recorded at soft soil sites of Mexico City scaled at different levels of intensities in terms of the spectral acceleration at first mode of vibration of the structure Sa(T1). Then, incremental dynamic analysis, seismic fragility, and structural reliability in terms of the maximum interstory drift are computed for all the buildings. For the three selected structures and the equivalent models with BRBs, it is concluded that the annual rate of exceedance is considerably reduced when BRBs are incorporated. For this reason, the structural reliability of the RC buildings with BRBs has a better behavior in comparison with the traditional reinforced concrete buildings. The use of BRBs is a good option to improve strength and seismic behavior and hence the structural reliability of RC buildings subjected to strong earthquake ground motions.

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Section: Structural Reliabilitymentioning

confidence: 95%

Enhanced Seismic Structural Reliability on Reinforced Concrete Buildings by Using Buckling Restrained Braces

Baca

Bojórquez

Leyva

et al. 2021

Shock and Vibration

Self Cite

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“…The safeguard of the built heritage is gaining an increasing interest in structural and seismic engineering [1,2]. The knowledge of the seismic response of the structures plays a fundamental role in the evaluation of the seismic vulnerability of existing structures [3][4][5][6] and in the prediction of the expected losses [7][8][9]. The designer, to achieve a correct safety evaluation in terms of the capacity demand ratio, must resort to non−linear models and non−linear analyses [10][11][12][13], which, even though they are described in the codes, are very prone to being misinterpreted.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Seismic Capacity of Existing Moment Resisting Frames by a Simplified Approach: Examples and Numerical Application

et al. 2021

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The capacity of a structure can be assessed using inelastic analysis, requiring sophisticated numerical procedures such as pushover and incremental dynamic analyses. A simplified method for the evaluation of the seismic performance of steel moment resisting frames (MRFs) to be used in everyday practice has been recently proposed. This method evaluates the capacity of buildings employing an analytical trilinear model without resorting to any non−linear analysis. Despite the methodologies suggested by codes, the assessing procedure herein described is of easy application, also by hand calculation. Furthermore, it constitutes a suitable tool to check the capacity of the buildings designed with the new seismic code prescriptions. The proposed methodology has been set up through a large parametric analysis, carried out on 420frames designed according to three different approaches: the theory of plastic mechanism control (TPMC), ensuring the design of structures showing global collapse mechanism (GMRFs), the one based on the Eurocode 8 design requirements (SMRFs), and a simple design against horizontal loads (OMRFs) without specific seismic requirements. In this paper, some examples of the application of this simplified methodology are proposed with references to structures supposed to exhibit global, partial and soft storey mechanism.

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“…Many studies have investigated the behavior of connections [35][36][37][38][39]; also, the behavior of prefabricated beam-to-column connections were studied by many researchers [40][41][42] among which [40] utilized short post-tensioned prestressed strands to prevent on-site aerial tensions. Furthermore, the connection of H-Shaped steel beam to box columns with flange plate connection was scrutinized by [43].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Behavior of Interior Steel Connections With Openings in Beam Web and Flange Under Monotonic Loading

2021

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Connections are considered to be one of the most prominent components of steel moment frames and have received studious attention in recent years. The core problem of welded connections is premature brittle fracture of weld in the critical beam-to-column connection region. Within the framework of this issue, various approaches have been proposed to solve the mentioned problem. Intentional weakening of the beam web or flange is in line with the purpose of leading the plastic hinge away from the column face, hence, increasing the ductility. The aim of this research is to investigate the behavior of interior connections subjected to monotonic lateral loading in case of presence of openings in beam web or flange. To do so, an ordinary fully welded rigid connection, reduced beam section, reduced web section, and drilled flange connection models are simulated numerically, utilizing finite element software, ANSYS. The results indicate that scrupulous selection of opening sizes are of great importance to fulfill the desired outcome which is avoiding the brittle failure of connections. Furthermore, the use of drilled flange, reduced beam section, or reduced web section connections satisfy the expected performance and it is proposed to use them according to practicability, architectural and economic considerations as well as site conditions. Shear deformation and local buckling is observed in reduced web section connections while in drilled flange connections, stress concentration around the opening is critical.

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Improving the Structural Reliability of Steel Frames Using Posttensioned Connections

Cited by 15 publications

References 33 publications

Enhanced Seismic Structural Reliability on Reinforced Concrete Buildings by Using Buckling Restrained Braces

Enhanced Seismic Structural Reliability on Reinforced Concrete Buildings by Using Buckling Restrained Braces

Evaluation of the Seismic Capacity of Existing Moment Resisting Frames by a Simplified Approach: Examples and Numerical Application

Investigation of Behavior of Interior Steel Connections With Openings in Beam Web and Flange Under Monotonic Loading

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