The Use of Machine Learning Models in Estimating the Compressive Strength of Recycled Brick Aggregate Concrete
Atefehossadat
Khademi
Undergraduate Student, Department of Mechanical and Energy Engineering, Shahid Beheshti University, Tehran, Iran
author
Kiachehr
Behfarnia
Associate Professor, Department of Civil Engineering, Isfahan University of Technology, Isfahan, Iran
author
Tanja
Kalman Šipoš
Department for Technical Mechanics, Faculty of Civil Engineering Osijek, J.J. Strossmayer University of Osijek, Vladimira Preloga 3, Osijek, Croatia
author
Ivana
Miličević
Department for Materials and Structures, Faculty of Civil Engineering Osijek, J.J. Strossmayer University of Osijek, Vladimira Preloga 3, Osijek, Croatia
author
text
article
2021
eng
The focus of this study is to investigate the applicability of Adaptive Neuro-Fuzzy Inference System (ANFIS), Artificial Neural Network (ANN), and Multiple Linear Regression (MLR) in modeling the compressive strength of Recycled Brick Aggregate Concrete (RBAC). A comparative study on the application of the aforementioned models is developed based on statistical tools such as coefficient of determination, mean absolute error, root mean squared error, and some others, and the application potential of each of these models is investigated. To study the effects of RBAC factors on the performance of representative data-driven models, the Sensitivity Analysis (SA) method is used. The findings revealed that ANN with R2 value of 0.9102 has a great application potential in predicting the compressive strength of concrete. In the absence of ANN, ANFIS with R2 value of 0.8538 is also an excellent substitute for predictions. MLR was shown to be less effective than the preceding models and is only recommended for preliminary estimations. In addition, Subsequent sensitivity analysis on the database indicates the reliability of the prediction models have a strong correlation to the number of input parameters. The application of ANN and ANFIS as a precursor to traditional methods can eliminate the need for old-style tests, thus, constituting a significant reduction in time and expense needed for design and/or repairs.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
4
v.
4
no.
2021
1
25
https://www.jcepm.com/article_136944_9225826aecc887623dcecdf80b592eea.pdf
dx.doi.org/10.22115/cepm.2021.297016.1181
Wind Induced Pressure Variation on High-Rise Geometrically Modified Building Having Interference through CFD Simulation
Amrit
Roy
Assistant Professor, Civil Engineering Department, NIT Hamirpur, HP, India
author
Atul
Sardalia
M.Tech. Student, Civil Engineering Department, NIT Hamirpur, HP, India
author
Jagbir
Singh
Ph.D. Student, Civil Engineering Department, NIT Hamirpur, HP, India
author
text
article
2021
eng
The wind different forms i.e. cyclones, hurricanes, storms, tornados, etc., loads various structures which come in their way. To minimize the wind effects, different techniques have been used and geometrical modification is one of them. In this study, the pressure variation on a geometrically modified high-rise corner-cut building having interference has been evaluated. The study is carried out using ANSYS FLUENT in which CFD simulation is carried out for the different models at different wind incidence angles viz. 0°, 45°, and 90°. Two building models are used in this study, one is high rise Corner-cut building, which is called the principal or primary building. The other is a high-rise rectangular building, which is called interfering or secondary building. The results obtained in case of interference are then compared to that of an isolated corner-cut building. In general, from the present investigation, it is noticed that the suction effect increases due to the interference effect. When wind strikes obliquely the effect of interference is relatively lower.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
4
v.
4
no.
2021
26
38
https://www.jcepm.com/article_140640_eb86049479f61f5dff8f1fe7c4f6e814.pdf
dx.doi.org/10.22115/cepm.2021.271960.1151
Development of Dam-Break Model Considering Real Case Studies with Asymmetric Reservoirs
Ahmad
Ferdowsi
Lecturer, University of Applied Science and Technology, Tehran, 15996-65111, Iran
author
Mahmood
Nemati
M.Sc. Graduate, Department of Water Engineering and Hydraulic Structures, Faculty of Civil Engineering, Semnan University, Semnan, Iran
author
Saeed
Farzin
Associate Professor, Department of Water Engineering and Hydraulic Structures, Faculty of Civil Engineering, Semnan University, Semnan, Iran
author
text
article
2021
eng
Dam-break flow is known as one of the most horrible phenomena. Some hypothetical reservoir geometries were evaluated in literature, but in nature, each reservoir has a unique geometry. In the present research, dam-break flow was studied based on different reservoir geometries using FLOW-3D. Six reservoirs were considered: reservoirs R1 and R2 belonged to Mahabad Dam (Iran) and Tignes Dam (France), with asymmetric reservoirs, respectively; reservoirs R3 and R4 had symmetrical trapezoidal reservoirs with angles 30 and 45 degrees, respectively; reservoir R5 had a rectangular shape, extending from one side; and reservoir R6 had a long reservoir, which also was used to verify FLOW-3D. The model performance was verified by experimental results and FLUENT model in literature. Results showed FLOW-3D with mesh sizes 30×30×30 mm and k-ɛ turbulence model outperformed FLUENT, based on R2, RMSE, and MAE. The results of water levels and flow velocities at five points proved that dam-break flow could vary from one dam to another, considering reservoir geometry. Peak water levels and velocities have been measured to show how reservoir geometry could cause catastrophic flow.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
4
v.
4
no.
2021
39
63
https://www.jcepm.com/article_140633_7b858484bf4d2db21441ad7442fe431b.pdf
dx.doi.org/10.22115/cepm.2021.311759.1188
Modal Analysis of a Thin-Walled Box-Girder Bridge and Railway Track Using Finite Element Framework
Virajan
Verma
Research Scholar, National Institute of Technology, Hamirpur, India
author
Abhilash
Malloth
Master of Technology Student, National Institute of Technology, Hamirpur, India
author
K.
Nallasivam
Assistant Professor, National Institute of Technology, Hamirpur, India
author
text
article
2021
eng
Modal analysis has received widespread acceptance in past few decades for a wide range of applications. Bridges and buildings are two of the most popular structures that use this application in the context of civil engineering. The current study aims to apply finite element technique to estimate the free vibration characteristics of a railway track and a box-girder bridge. The curved bridge is numerically modeled using thin-walled box-beam finite elements that take into account torsional warping, distortion, and distortional warping, all of which are important characteristics of thin-walled box-girders. A commercially available finite element software ANSYS is used to simulate the railway track in three dimensions. The study is restricted to the initial design stage of a thin-walled box-girder bridge decks, in which a full three-dimensional finite element model is not required. For the thin-walled box-girder bridge, a MATLAB code has been built that yields the corresponding modal parameter results, whilst the modal parameters of the railway track system are acquired using ANSYS software.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
4
v.
4
no.
2021
64
83
https://www.jcepm.com/article_140641_5e5507ae654e794f93c69f4b8f802631.pdf
dx.doi.org/10.22115/cepm.2021.278798.1165
The Effect of Heavy Metal Concentration on the Soil of Odagbo Area, Kogi State Nigeria
Oloche
Ekwule
Department of Civil Engineering, Federal University of Agriculture Makurdi, Makurdi, Nigeria
author
Moses
Ugbede
Department of Civil Engineering, Federal University of Agriculture Makurdi, Makurdi, Nigeria
author
Delian
Akpen
Department of Civil Engineering, Federal University of Agriculture Makurdi, Makurdi, Nigeria
author
text
article
2021
eng
The study is aimed at evaluating the effect of coal mining on the soil of Odagbo area, Kogi State, Nigeria. Twenty-eight (28) soil samples were collected each in the wet and dry seasons where twenty-one of the samples were from a mining site while seven samples were from the control site at depths of 0, 0.5, 1.0, 1.5, 2.0, 2.5 and 3.0 m respectively. The heavy metal concentration of the samples were determined using Flame Atomic Absorption Spectrophotometer (FAAS). Standard pollution indices such as I-geo and Pollution Indices were deployed to assess the level of heavy metal contamination in the soil. The result showed the order of dominance of the heavy metals monitored as Fe>Ni>Zn>Mn>Cr>Pb>Cd>Cu>Co. The mean concentration levels of all the heavy metals were lower than mean background values except Cu and Fe during the dry season. The results of the study revealed that the soil of the Odagbo is polluted by all the tested heavy metals based on the calculated PI and I-geo for the heavy metals. The PI was mostly 1≤ PI ≤ 2(moderate pollution) for all the depths except for the elevated case of copper thus indicating practically low to moderate contamination. The I-geo was mostly less than 0 at all the depths except for the elevated cases of copper, iron and zinc during the dry season and Copper and Iron during the wet season thus indicating uncontaminated condition. In conclusion, the data obtained from the study demonstrated that the distribution of metal concentration in the study area when compared to the control site was largely influenced by anthropogenic activities particular from the coal mining site.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
4
v.
4
no.
2021
84
93
https://www.jcepm.com/article_140642_7b30c17655e042c6efde6f8e7870d78a.pdf
dx.doi.org/10.22115/cepm.2021.292378.1177
Vehicle Bridge Interaction Analysis on Concrete and Steel Curved Bridges
Yunchao
Ye
Research Assistant, the Bridge Engineering Software and Technology (BEST) Center, Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20740 USA
author
Chung C.
Fu
Research Professor and Director, the Bridge Engineering Software and Technology (BEST) Center, Department of Civil and Environmental Engineering, University of Maryland, College Park, MD 20740 USA
author
Xinyi
Huang
Associate Professor, College of Civil Engineering, Fuzhou University, Fuzhou 350116, China
author
text
article
2021
eng
This study investigation is intended to research the dynamic response of horizontally curved bridges under heavy vehicle loads. Most of the main factors that affect the bridge dynamic response due to moving vehicles are considered. An improved 3D grid model, based on commercial software ANSYS Mechanical APDL, is developed for the analysis of curved bridges following the 3D shear-flexibility grillage analyzing method. A simplified numeric method, considering the effect of random road roughness and its velocity term, is developed for solving the interaction problem. With the model and numerical method presented, a series of parametric studies are conducted to study the curved bridge dynamic interaction. Based on the investigation of determining factors of curve bridge dynamic interaction, the expression of the upper-bound envelop for impact factors of maximum deflection is given with different surface conditions and highway speed limits as a function of bridge fundamental frequency or bridge central angle. A study is conducted on comparing these empirical equations and serval other major design codes, comments and suggestions are then made based on the discoveries.
Computational Engineering and Physical Modeling
Pouyan Press
2588-6959
4
v.
4
no.
2021
94
108
https://www.jcepm.com/article_140658_f3ae516f511eba1f550cb678fa547eff.pdf
dx.doi.org/10.22115/cepm.2021.272934.1155