Optimal Design of Seismic Resistant RC Columns

Foraboschi, Paolo

doi:10.3390/ma13081919

Cited by 25 publications

(4 citation statements)

References 41 publications

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“…The calculation method of axial compressive bearing capacity is very important in the design of columns [20,21]. When calculating the axial compressive capacity of RECFAT, it was necessary to consider the confinement ability of the aluminum tube.…”

Section: Calculation Methods For Bearing Capacitymentioning

confidence: 99%

Axial Compression Performance and Bearing Capacity Calculation of Round-Ended Concrete-Filled Aluminum Tube Column

Yong

et al. 2023

Applied Sciences

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This study aimed to investigate the axial compression performance of concrete-filled circular-end aluminum tube (RECFAT) columns, utilizing four specimens with varying parameters such as cross-sectional aspect ratio and cross-sectional aluminum content. Axial compression tests and ABAQUS finite element extended parameter analyses were conducted, with key mechanical performance indicators such as specimen failure morphology, ultimate bearing capacity, load–displacement curve, and load–strain curve being obtained. The influence of various variation parameters on the axial compression performance of the specimen was analyzed. The results indicated that the majority of specimens underwent oblique shear failure due to local bulging of the aluminum tube plane, while specimens with an aspect ratio of 4.0 experienced overall instability failure. As the aspect ratio increased, the bearing capacity improvement coefficient and ductility coefficient of the specimen decreased and the initial stiffness of the specimen gradually decreased. As the aluminum content increased, the initial stiffness decreased, with the critical aspect ratio for overall instability being between 2.0 and 2.5. The optimal aluminum content was recommended to be between 8.5% and 13.5%. When the aspect ratio was around 2.0, the lateral strain of the round-ended aluminum tube developed faster and the constraint effect was the best. The finite element model accurately reproduced the oblique shear bulging of the round-ended aluminum tube and the internal concrete V-shaped collapse, with the axial load–displacement curve being in good agreement. Improving the strength of aluminum alloy was more conducive to improving the axial compression bearing capacity of RECFAT than increasing the strength of concrete. A simplified model and calculation method for RECFAT was proposed, with an error of less than 1%.

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Section: Calculation Methods For Bearing Capacitymentioning

confidence: 99%

Axial Compression Performance and Bearing Capacity Calculation of Round-Ended Concrete-Filled Aluminum Tube Column

Yong

et al. 2023

Applied Sciences

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“…In the end, the mechanical model [ 89 , 90 , 91 , 92 ] that best describes the stress state of the concrete that surrounds the circumscribing cylinder is the homogeneous, isotropic, weightless, linearly elastic semi-space (half space) with a plane surface that passes through the origin of the Cartesian coordinate system and is perpendicular to the shear force V g . The half space is loaded at that surface by a strip load of width D and magnitude p c ( z ).…”

Section: Preliminary Numerical Analysesmentioning

confidence: 99%

Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

Foraboschi

2023

Materials

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This paper is devoted to the fastening system that consists of a number of anchors of approximately equal effective embedment depth, called “anchor group”, embedded into hardened concrete, used to transmit forces transverse to the anchors from an attachment to the concrete. The anchor group is far from the edges and is subjected to no more than marginal axial forces. Being post-installed, rather than cast-in, the embedded end of each anchor is not hooked, and no nuts, washers, or plates are attached to the embedded shaft. The paper focuses on the transverse forces that can be transmitted across an anchor group from an attachment to the concrete. The paper provides an analytical model for predicting the maximum (ultimate) shear force that an anchor group can bear, thus called “shear strength”. The model hence allows the structural designer to predict the shear strength of an anchor group post-installed into concrete. The model is based on five mechanical assumptions, which were established from a wide-ranging numerical analysis. Model predictions turned out to be, on average, 20% lower than the results of experiments performed on cast-in anchor groups borrowed from literature. The comparison verifies model accuracy, considering that the tested anchor groups benefitted from the extra-strength furnished by nuts and washers attached to the embedded shaft. Model predictions were also compared to code provisions; the former resulted to be up to one third of the latter. The paper presents and comments those comparisons, as well as all mathematical development. Applications of the model to wide-ranging case studies is presented and discussed as well.

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“…In the disaster zone of which building stock is mostly reinforced concrete, apart from the collapsed buildings, there are huge number of buildings that need to be retrofitted and strengthened against future earthquakes. Some of them are required to be upgraded entirely while some needs member-based strengthening by the seismic retrofitting methods presented in the related literature (Cosgun et al, 2022;Foraboschi, 2016Foraboschi, , 2020Lu et al, 2022). According to the report presented by reconnaissance team of Earthquake Engineering Research Institute (EERI), six seismically base-isolated hospital buildings in the earthquake zone had showed good performance under the earthquake motions and remain operational.…”

Section: Introductionmentioning

confidence: 99%

Optimizing base isolation system parameters using a fuzzy reinforced butterfly optimization: A case study of the 2023 Kahramanmaras earthquake sequence

Kandemir,

Mortazavi

2023

Journal of Vibration and Control

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This study aims to obtain the viable parameters of base isolation systems that are utilized in buildings with seismic isolation and specially located in Turkey. To provide a more accurate representation of real-world scenarios, the study accounts for severe ground motion records simultaneously during the dynamic response analysis of the structure. Three records are taken from the 2023 Turkey earthquake (records for Elbistan, Nurdagi, and Pazarcik). The optimization model's objective function is to minimize the ratio of the roof acceleration to the peak ground acceleration. To ensure realistic outcomes, certain isolation parameters are constrained, such as maintaining the damping ratio and period within a predetermined range as well as the maximum lateral drift of the structure. An upgraded variant of the Butterfly Optimization Algorithm, known as the Fuzzy Butterfly Optimization Algorithm (FBOA), is employed to address the presented optimization model. The FBOA technique incorporates a fuzzy decision-making mechanism that adjusts its search strategy according to the prevailing conditions of the present problem. In addition, the FBOA method utilizes a new auxiliary vector called virtual butterfly, which provides information on the entire population based on each agent's quality. Consequently, FBOA transforms into a self-regulating search algorithm, eliminating the requirement for any external parameters. Results have verified the effectiveness of FBOA in detecting optimal parameters of the proposed isolation system.

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Optimal Design of Seismic Resistant RC Columns

Cited by 25 publications

References 41 publications

Axial Compression Performance and Bearing Capacity Calculation of Round-Ended Concrete-Filled Aluminum Tube Column

Axial Compression Performance and Bearing Capacity Calculation of Round-Ended Concrete-Filled Aluminum Tube Column

Ultimate Shear Force of an Any Anchor Group Post-Installed into Concrete

Optimizing base isolation system parameters using a fuzzy reinforced butterfly optimization: A case study of the 2023 Kahramanmaras earthquake sequence

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