Performance of a novel bent-up bars system not interacting with concrete

Shishegaran, Aydin; Ghasemi, Mohammad Reza; Varaee, Hesam

doi:10.1007/s11709-019-0552-4

Cited by 44 publications

(23 citation statements)

References 34 publications

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“…The prediction models can help to decrease the cost of time in each problem. Several studies used multiple linear regression (MLR) and multiple Ln equation regression (MLnER) in predicting the performance of reinforced concrete (RC) elements (Reza Ghasemi and Shishegaran, 2017;Shishegaran et al, 2019). Gene expression programming (GEP) is one of the useful methods for simulating a phenomenon, which was used in predicting the deflection of RC panels, beam, and columns (Ghasemi and Shishegaran, 2017;Shishegaran et al, 2020a).…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…4. There are various studies available focused on force-deflection and strength of other materials, like concrete and steel bars [19,20], however, since NiTis show super elastic properties by the changes within its internal structure, they have a high potential to be used as actuator alternatives in industrial applications. In this study, an elastic, lightweight, and thin SMA wire has been observed under varying electrical current values.…”

Section: Introductionmentioning

confidence: 99%

Measurement of temperature and displacement with NiTi actuators under certain electrical conditions

Toptaş¹,

Çelebi²,

Ersoy³

2021

J. meas. eng.

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In this study, various mechanical behaviors of a shape memory alloy, depending on different thermal and electrical conditions to be used in areas such as biomedical, aerospace and aeronautics. Temperature changes and length change rates under different electrical current values of a shape memory alloy named "nickel titanium", or "nitinol" (NiTi) has been observed. It has been seen that a 0.3 mm diameter wire can generate a force of 25 N while the material extends its linear measurement with a rate of 3.7 mm/s. It is observed that, under diverse constant electrical current values, the displacement and temperature relations of the nickel titanium wire is varying. It has empirically been seen that the nickel titanium alloy actuators are advantageous than their alternatives in terms of the generated strength to weight ratio and shape memory alloy materials can be used as actuators in industrial and biomedical applications.

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“…At present, some scholars have carried out the research on the dynamics of small clear distance tunnel, and the research results mainly focus on two aspects: engineering blasting and earthquake action. Some scholars used the numerical simulation method to carry out the research of structural damage [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on acceleration response laws of shallow-buried bias tunnels with a small distance

Wang¹,

Ren²,

Peng³

et al. 2020

J. vibroeng.

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Based on the similarity theory, a physical testing model with scale of 1:10 was designed and fabricated. The Wenchuan wave (WC-XZ), Darui artificial wave (DR-XZ) and Kobe wave (K-XZ) were adopted as excitation waves which was XZ directions (horizontal and vertical loading at the same time). A series of shaking table tests were carried out to study the effect of the types, directions and peaks acceleration of the seismic waves on the acceleration response laws of the shallow-buried bias tunnels with small distance. The results show that: (1) in the horizontal direction, the types of the seismic waves have a little effect on the acceleration response, but the law is opposite with Kobe wave being the most serious, followed by Darui artificial wave and Wenchuan wave in the vertical direction. (2) The existing slope has a significant effect on the acceleration response of the right hole which is different from that of the left hole. (3) The acceleration response of the tunnel in the vertical direction is more severe than that of the horizontal direction and the acceleration amplification factors in vertical direction are is generally 1.02-3.94 times that of the horizontal direction. (4) in the seismic design of tunnel, different seismic measures should be adopted in different directions. The results have a significant reference for the anti-seismic design of the tunnel.

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Performance of a novel bent-up bars system not interacting with concrete

Cited by 44 publications

References 34 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

Measurement of temperature and displacement with NiTi actuators under certain electrical conditions

Experimental study on acceleration response laws of shallow-buried bias tunnels with a small distance

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