Evaluation of a developed bypass viscous damper performance

Fahiminia, Mahrad; Shishegaran, Aydin

doi:10.1007/s11709-020-0627-2

Cited by 22 publications

(7 citation statements)

References 33 publications

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“…Two types of behavior, including elastic and plastic behaviors, should be simulated in nonlinear problems (Fahiminia and Shishegaran, 2020;Shishegaran et al, 2020b). We used the elastic and plastic behaviors of the steel bar, which was also used by Dadashi et al (2017).…”

Section: Steelmentioning

confidence: 99%

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Bigdeli

Shishegaran

Naghsh

et al. 2021

J. Zhejiang Univ. Sci. A

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In the present study, the performance of reinforced concrete tunnel (RCT) under internal water pressure is evaluated by using nonlinear finite element analysis and surrogate models. Several parameters, including the compressive and tensile strength of concrete, the size of the longitudinal reinforcement bar, the transverse bar diameter, and the internal water pressure, are considered as the input variables. Based on the levels of variables, 36 mix designs are selected by the Taguchi method, and 12 mix designs are proposed in this study. Carbon fiber reinforced concrete (CFRC) or glass fiber reinforced concrete (GFRC) is considered for simulating these 12 samples. Principal component regression (PCR), Multi Ln equation regression (MLnER), and gene expression programming (GEP) are employed for predicting the percentage of damaged surfaces (PDS) of the RCT, the effective tensile plastic strain (ETPS), the maximum deflection of the RCT, and the deflection of crown of RCT. The error terms and statistical parameters, including the maximum positive and negative errors, mean absolute percentage error (MAPE), root mean square error (RMSE), coefficient of determination, and normalized square error (NMSE), are utilized to evaluate the accuracy of the models. Based on the results, GEP performs better than other models in predicting the outputs. The results show that the internal water pressure and the mechanical properties of concrete have the most effect on the damage and deflection of the RCT.

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Section: Steelmentioning

confidence: 99%

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Bigdeli

Shishegaran

Naghsh

et al. 2021

J. Zhejiang Univ. Sci. A

Self Cite

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“…At present, national and international research scholars have mostly used numerical simulation, theoretical analysis, engineering measurement, and other comprehensive research approaches to study the stability of the tunnel surrounding rock at different levels and angles [6][7]. For example, Fahiminia et al used the finite element method to study the vibration response of tunnels under the influence of different hollowing methods in large-section tunnels, and the optimized cavity-making method obtained from the experiment has a better field control effect on the construction process and construction cost [8]. However, as the level of the surrounding rock decreases, the ground stress gradually increases and the effect of the tunneling method on the stability of the surrounding rock gradually decreases, while the choice of excavation method and support technology gradually becomes another key factor for the safety and stability of the tunnel.…”

Section: Introductionmentioning

confidence: 99%

Dynamic damage and response characteristics of the tunnel by FEM modeling and field trials

Zheng¹,

Wu²,

Wu³

et al. 2023

J. vibroeng.

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The dynamic response characteristics of the tunnel and the stability of the surrounding rock are crucial to its safety of the tunnel. Combining the numerical simulation software and field measurement results, the change of peak particle vibration (PPV) and stress were analyzed, based on the longitudinal wave data from the acoustic tests, the blasting damage effects under the action of different blasting counts, including different locations in the deep part of the surrounding rock, were investigated. The results show that: (1) in the vertical direction of the tunnel, the PPV of the tunnel floor and tunnel sidewall is larger, the PPV of the tunnel top is the second, and the tunnel arch shoulder and arch foot is the smallest; (2) under the action of blasting, the stress concentration at the tunnel bottom and arch foot is easier, and the stress monitoring should be strengthened; (3) The depth of damage at different distances was 1.5 m and 3.0 m, respectively, and the depth of damage to the surrounding rock increased from 2.5 m to 4.0 m when the number of blasts was 10 and the number of blasts was 10.

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“…Using a reasonable fnite element model to analyze and predict the performance of concrete components can solve the problems of time-consuming, expensive, and consuming workforce. Fahiminia and Shishegaran [21] simulated and presented computational fuid dynamics (CFD) models and formulas in their experiments on viscous dampers and evaluated the validation of numerical and computational models. Tey also accurately analyzed the seismic performance of building components with and without viscous dampers.…”

Section: Introductionmentioning

confidence: 99%

Flexural Reinforcement of Over-Reinforced Beam by Ultrahigh Performance Concrete Layer

Yang

Yao

Liu

2022

Mathematical Problems in Engineering

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In order to improve the failure state of over-reinforced beams and enhance their ductility, an innovative reinforcement method was proposed by adding an ultrahigh performance concrete (UHPC) layer on the top surface of the over-reinforced beam to take advantage of the high compressive strength of UHPC. The numerical simulation method was used to carry out the research. The validity of the finite element model was verified by comparing it with the experimental results, and the effectiveness of the new reinforcement method was verified by comparing it with the calculation results after adding the UHPC layer. Then, a detailed parameter study was carried out, including the thickness of the UHPC layer, the cross-section area of longitudinal tension rebar, and concrete strength. The load-deflection curve, flexural bearing capacity, and deflection ductility coefficient were studied. The results show that the bearing capacity of the UHPC-reinforced over-reinforced beams is significantly increased by 88.1%. And the stiffness and ductility of the beams are also significantly increased, with the ductility coefficient reaching 23.85. In addition, flexural bearing capacity increases with the thickness of the UHPC layer and sectional area of longitudinal tension rebar. Finally, a prediction model for the flexural bearing capacity of UHPC layer-reinforced over-reinforced beams is proposed, which further verifies the effectiveness of this method.

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Evaluation of a developed bypass viscous damper performance

Cited by 22 publications

References 33 publications

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Surrogate models for the prediction of damage in reinforced concrete tunnels under internal water pressure

Dynamic damage and response characteristics of the tunnel by FEM modeling and field trials

Flexural Reinforcement of Over-Reinforced Beam by Ultrahigh Performance Concrete Layer

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