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CONTENTS | |
Volume 42, Number 3, February 2022 |
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- Structural behavior of steel beams strengthened with CFRP strips and cables Donghwan Lim
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Abstract; Full Text (1585K) . | pages 289-298. | DOI: 10.12989/scs.2022.42.3.289 |
Abstract
In the present study, structural behavior of steel beams strengthened with CFRP strips and cables was investigated
by a series of experiments. For this purpose, two groups of experimental studies were carried out: one for the beam series
strengthened only with CFRP strips and the other for the steel beam series strengthened with CFRP strips and prestressed wires.
From this test, it is found that the flexural stiffness and strength of the steel beams strengthened with CFRP strips and cables
were significantly improved comparing to the un-strengthened one. Three failure modes such as sudden de-bonding, splitting
and rupturing of CFRP strips were observed. The ultimate tensile strains of attached CFRP strips on the steel beams were
noticed in the range between 8,000µε and 11,000µε and this result disclose the perfect composite reaction CFRP strips and steel
beams.
Key Words
carbon fiber reinforced plastic (CFRP) strips; prestressed cables; steel beam
Address
Department of Civil Engineering, Dongseo University, San 69-1, Churae 2 dong, Sasang ku, Busan 617-716, South Korea
- Shear resistance of steel–concrete–steel deep beams with bidirectional webs Yu-Tao Guo, Xin Nie, Jian-Sheng Fan and Mu-Xuan Tao
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Abstract; Full Text (2407K) . | pages 299-313. | DOI: 10.12989/scs.2022.42.3.299 |
Abstract
Steel–concrete–steel composite structures with bidirectional webs (SCSBWs) are used in large-scale projects and
exhibit good mechanical performances and constructional efficiency. The shear behaviors of SCSBW deep beam members in
key joints or in locations subjected to concentrated forces are of concern in design. To address this issue, experimental program
is investigated to examine the deep-beam shear behaviors of SCSBWs, in which the cracking process and force transfer
mechanism are revealed. Compared with the previously proposed truss model, it is found that a strut-and-tie model is more
suitable for describing the shear mechanism of SCSBW deep beams with a short span and sparse transverse webs. According to
the experimental analyses, a new model is proposed to predict the shear capacities of SCSBW deep beams. This model uses
strut-and-tie concept and introduces web shear and dowel action to consider the coupled multi mechanisms. A stress
decomposition method is used to distinguish the contributions of different shear-transferring paths. Based on case studies, a
simplified model is further developed, and the explicit solution is derived for design efficiency. The proposed models are
verified using experimental data, which are proven to have good accuracy and efficiency and to be suitable for practical
application.
Key Words
composite structure; deep beam; experiment; mechanical model; sandwich structure; shear
Address
Yu-Tao Guo: Key Lab. of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua University, Beijing, China 100084
Xin Nie: Key Lab. of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua University, Beijing, China 100084
Jian-Sheng Fan: Beijing Engineering Research Center of Steel and Concrete Composite Structures, Dept. of Civil Engineering, Tsinghua University, Beijing, China 100084
Mu-Xuan Tao: Key Lab. of Civil Engineering Safety and Durability of China Education Ministry, Dept. of Civil Engineering, Tsinghua University, Beijing, China 100084
- Push out tests on various shear connectors used for cold-formed steel composite beam Senthilkumar Rajendran, Jayabalan Perumalsamy and Divya Mohanraj
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Abstract; Full Text (1666K) . | pages 315-323. | DOI: 10.12989/scs.2022.42.3.315 |
Abstract
Shear connectors are key elements that ensure integrity in a composite system. The primary purpose of a shear
connector is to bring a high degree of interaction between composite elements. A wide variety of connectors are available for
hot-rolled composite construction, connected to the beam through welding. However, with cold-formed members being very
thin, welding of shear connectors is not desirable in cold-formed composite constructions. Shear connectors for cold-formed
elements are limited in studies as well as in the market. Hence in this study, three different types of shear connectors, namely,
single-channel, double channel, and self–tapping screw, were considered, and their performance assessed by the Push-out test as
per Eurocode 4. The connection between channel shear connectors and the beam was made using self-tapping screws to avoid
welding. The performance of the connectors was analyzed based on their ultimate capacity, characteristic capacity, ductility, and
slippage during loading. Strength to weight ratio was also carried out to understand the proposed connectors' suitability for
conventional ones. The results showed relatively higher initial stiffness and ductility for double channel connectors than other
connectors. Also, self-tapping screws had a higher strength to weight ratio with low ductility.
Key Words
channel connector; cold-formed composite beam; push-out test; shear connectors
Address
Senthilkumar Rajendran:Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu-620015
Jayabalan Perumalsamy:Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu-620015
Divya Mohanraj:Department of Civil Engineering, National Institute of Technology Tiruchirappalli, Tiruchirappalli, Tamil Nadu-620015
- Impact response of ultra-high performance fiber-reinforced concrete filled square double-skin steel tubular columns Jie Li, Weiqiang Wang, Chengqing Wu, Zhongxian Liu and Pengtao Wu
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Abstract; Full Text (4280K) . | pages 325-351. | DOI: 10.12989/scs.2022.42.3.325 |
Abstract
This paper studies the lateral impact behavior of ultra-high performance fiber-reinforced concrete (UHPFRC) filled
double-skin steel tubular (UHPFRCFDST) columns. The impact force, midspan deflection, and strain histories were recorded.
Based on the test results, the influences of drop height, axial load, concrete type, and steel tube wall thickness on the impact
resistance of UHPFRCFDST members were analyzed. LS-DYNA software was used to establish a finite element (FE) model of
UHPFRC filled steel tubular members. The failure modes and histories of impact force and midspan deflection of specimens
were obtained. The simulation results were compared to the test results, which demonstrated the accuracy of the finite element
analysis (FEA) model. Finally, the effects of the steel tube thickness, impact energy, type of concrete and impact indenter shape,
and void ratio on the lateral impact performances of the UHPFRCFDST columns were analyzed.
Key Words
drop hammer; Finite Element Analysis (FEA); steel tube; ultra-high performance fiber-reinforced concrete
Address
Jie Li:Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China
Weiqiang Wang: College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
Chengqing Wu:School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
Zhongxian Liu:Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China
Pengtao Wu:Tianjin Key Laboratory of Civil Structure Protection and Reinforcement, Tianjin Chengjian University, Tianjin 300384, China
- A nonlocal system for the identification of active vibration response of chiral double walled CNTs Sami Alghamdi, Muzamal Hussain, Mohamed A. Khadimallah, Sehar Asghar, Emad Ghandourah, Ahmed Obaid M. Alzahrani and M.A. Alzahrani
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Abstract; Full Text (1513K) . | pages 353-361. | DOI: 10.12989/scs.2022.42.3.353 |
Abstract
In this study, an estimation regarding nonlocal shell model based on wave propagation approach has been
considered for vibrational behavior of the double walled carbon nanotubes with distinct nonlocal parameters. Vibrations of
double walled carbon nanotubes for chiral indices (8, 3) have been analyzed. The significance of small scale is being perceived
by developing nonlocal Love shell model. The influence of changing mechanical parameter Poisson's ratio has been investigated
in detail. The dominance of boundary conditions via nonlocal parameter is shown graphically. It is found that on increasing the
Poisson's ratio, the frequencies increases. It is noted that the frequencies of clamped-clamped frequencies are higher than that of
simply-supported and clamped-free edge conditions. The outcomes of frequencies are tested with earlier computations.
Key Words
double-walled CNTs; love shell theory; nonlocal parameter; poisson
Address
Sami Alghamdi:Electrical and Computer Engineering Department King Abdulaziz, University, Jeddah, Saudi Arabia
Muzamal Hussain:Department of Mathematics, Govt. College University Faisalabad, 38040, Faisalabad, Pakistan
Mohamed A. Khadimallah:Prince Sattam Bin Abdulaziz University, College of Engineering, Civil Engineering Department, BP 655, Al-Kharj, 16273, Saudi Arabia/ Laboratory of Systems and Applied Mechanics, Polytechnic School of Tunisia, University of Carthage, Tunis, Tunisia
Sehar Asghar:Department of Mathematics, Govt. College University Faisalabad, 38040, Faisalabad, Pakistan
Emad Ghandourah:Department of Nuclear Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia
Ahmed Obaid M. Alzahrani:Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia/ Physics Department, Faculty of Science, King Abdulaziz, University, Jeddah, Saudi Arabia
M.A. Alzahrani:Mechanical Engineering Department, Faculty of Science, King Abdulaziz, University, Jeddah, Saudi Arabia
- Development of new inner diaphragms for a H-beam and composite box column joint Mahbub Khan, Brian Uy and Jin W Kim
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Abstract; Full Text (3010K) . | pages 363-373. | DOI: 10.12989/scs.2022.42.3.363 |
Abstract
This paper presents an experimental and a numerical investigation of a H-beam – composite box column joint
fabricated with two new inner diaphragms and a continuous inner diaphragm. The main objective of the current research project
is to investigate the structural performance of the newly developed inner diaphragms under a cyclic loading protocol. Hysteretic
behaviour of the composite joints is analysed to investigate the structural performance of the new and continuous inner
diaphragms. This paper compares the result of the finite element (FE) models with the new and continuous inner diaphragms
against their counterpart experimental results. To produce a design criterion for the newly developed inner diaphragms, yielding
or failure area of the inner diaphragms under tensile stress is analysed from the FE results.
Key Words
composite beam-column joint; finite element model; new inner diaphragms; seismic behaviour
Address
Mahbub Khan:School of Civil Engineering, University of Sydney, NSW, Australia
Brian Uy:School of Civil Engineering, University of Sydney, NSW, Australia
Jin W Kim:Steel Solution Research Lab, POSCO, Republic of Korea
- Limit elastic speed analysis of rotating porous annulus functionally graded disks Royal Madan, Shubhankar Bhowmick, Lazreg Hadji and Abdelouahed Tounsi
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Abstract; Full Text (3973K) . | pages 375-388. | DOI: 10.12989/scs.2022.42.3.375 |
Abstract
In this work, limit elastic speed analysis of functionally graded porous rotating disks has been reported. The work
proposes an effective approach for modeling the mechanical properties of a porous functionally graded rotating disk. Four
different types of porosity models namely: uniform, symmetric, inner maximum, and outer maximum distribution are
considered. The approach used is the variational principle, and the solution has been achieved using Galerkin's error
minimization theory. The study aims to investigate the effect of grading indices, aspect ratio, porosity volume fraction, and
porosity types on limit angular speed for uniform and variable disk geometries of constant mass. To validate the current study,
finite element analysis has been used, and there is good agreement between the two methods. The study yielded a decrease in
limit speed as grading indices and aspect ratio increase. The porosity volume fraction is found to be more significant than the
aspect ratio effect. The research demonstrates a range of operable speeds for porous and non-porous disk profiles that can be
used in industries as design data. The results show a significant increase in limit speed for an exponential disk when compared to
other disk profiles, and thus, the study demonstrates a range of FG-based structures for applications in industries that will not
only save material (lightweight structures) but also improve overall performance.
Key Words
effective yield stress; Halpin-Tsai; limit elastic speed analysis; porous FG disk; variational principle
Address
Royal Madan:Department of Mechanical Engineering, National Institute of Technology Raipur (C.G)-492010, India
Shubhankar Bhowmick:Department of Mechanical Engineering, National Institute of Technology Raipur (C.G)-492010, India
Lazreg Hadji:Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 70000, Vietnam/ Laboratory of Geomatics and Sustainable Development, University of Tiaret, 14000, Algeria
Abdelouahed Tounsi:YFL (Yonsei Frontier Lab), Yonsei University, Seoul, Korea/ Department of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, 31261 Dhahran, Eastern Province, Saudi Arabia
- Settlement of velocity dissemination with fluid parameters for the configuration of stretching cylinder Mudassar Jalil, Waheed Iqbal, Muzamal Hussain, Mohamed A. Khadimallah, Adil Alshoaibi, Jamel Baili, Khaled Mohamed Khedher, Elimam Abdallah Ali and Abdelouahed Tounsi
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Abstract; Full Text (1827K) . | pages 389-396. | DOI: 10.12989/scs.2022.42.3.389 |
Abstract
This investigation in fluid mechanics surrounds around the variety of flow problems for different fluids along the
stretching cylinder. Numerical procedure is carried out for the obtained resultant equations by Keller-Box technique. Numerical
study of laminar, steady, viscous and incompressible two dimensional boundary layer flow of effects of suction and blowing on
boundary layer slip flow of Casson fluid along permeable exponentially stretching cylinder has been carried out in the present
draft. physical parameters i.e., Nusselt number and skin friction coefficient, suction parameter and the local Reynold number are
investigated on velocity profile and elaborated through proper graphs and table.
Key Words
numerical study; Reynold number; skin friction; velocity profile
Address
Mudassar Jalil:Department of Mathematics, COMSATS Institute of Information Technology, Park Road, Chak Shahzad, 44000 Islamabad, Pakistan
Waheed Iqbal:Department of Mathematics, Govt. College University Faisalabad, 38000, Faisalabad, Pakistan
Muzamal Hussain:Department of Mathematics, Govt. College University Faisalabad, 38000, Faisalabad, Pakistan
Mohamed A. Khadimallah:Prince Sattam Bin Abdulaziz University, College of Engineering, Civil Engineering Department, BP 655, Al-Kharj, 11942, Saudi Arabia
Adil Alshoaibi:Department of Physics, College of Science, King Faisal University, Al-Hassa, P.O Box, Hofuf, 31982, Saudi Arabia
Jamel Baili:Department of Computer Engineering, College of Computer Science, King Khalid University, Abha 61413, Saudi Arabia/ Higher Institute of Applied Science and Technology of Sousse (ISSATS), Cité Taffala (Ibn Khaldoun) 4003 Sousse,
University of Souse, Tunisia
Khaled Mohamed Khedher:Department of Civil Engineering, College of Engineering, King Khalid University, Abha 61421, Saudi Arabia/ Department of Civil Engineering, High Institute of Technological Studies, Mrezgua University Campus, Nabeul 8000, Tunisia
9YFL (Yonsei Frontier Lab), Yonsei University, Seoul, Kore
Elimam Abdallah Ali:Prince Sattam Bin Abdulaziz University, College of Engineering, Civil Engineering Department, BP 655, Al-Kharj, 11942, Saudi Arabia
Abdelouahed Tounsi:YFL (Yonsei Frontier Lab), Yonsei University, Seoul, Korea/ Department of Civil and Environmental Engineering, King Fahd University of Petroleum & Minerals, 31261 Dhahran,
Eastern Province, Saudi Arabia
- Wave propagation and vibration of FG pipes conveying hot fluid Yi-Wen Zhang and Gui-Lin She
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Abstract; Full Text (1995K) . | pages 397-405. | DOI: 10.12989/scs.2022.42.3.397 |
Abstract
The existing researches on the dynamics of the fluid-conveying pipes only focus on stability and vibration problems,
and there is no literature report on the wave propagation of the fluid-conveying pipes. Therefore, the purpose of this paper is to
explore the propagation characteristics of longitudinal and flexural waves in the fluid-conveying pipes. First, it is assumed that
the material properties of the fluid-conveying pipes vary based on a power function of the thickness. In addition, it is assumed
that the material properties of both the fluid and the pipes are closely depended on temperature. Using the Euler-Bernoulli beam
equation and based on the linear theory, the motion equations considering the thermal-mechanical-fluid coupling is derived.
Then, the exact expressions of phase velocity and group velocity of longitudinal waves and bending waves in the fluidconveying pipes are obtained by using the eigenvalue method. In addition, we also studied the free vibration frequency
characteristics of the fluid-conveying pipes. In the numerical analysis, we successively studied the influence of temperature,
functional gradient index and liquid velocity on the wave propagation and vibration problems. It is found that the temperature
and functional gradient exponent decrease the phase and group velocities, on the contrary, the liquid flow velocity increases the
phase and group velocities. However, for vibration problems, temperature, functional gradient exponent parameter, and fluid
velocity all reduce the natural frequency.
Key Words
conveying-fluid pipes; group velocity; phase velocity; vibration; wave propagation
Address
Yi-Wen Zhang:College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China
Gui-Lin She:College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China
- Static behavior of high strength friction-grip bolt shear connectors in composite beams Ying Xing, Yanbin Liu, Caijun Shi, Zhipeng Wang, Qi Guo and Jinfeng Jiao
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Abstract; Full Text (4630K) . | pages 407-426. | DOI: 10.12989/scs.2022.42.3.407 |
Abstract
Superior to traditional welded studs, high strength friction-grip bolted shear connectors facilitate the assembling and
demounting of the composite members, which maximizes the potential for efficiency in the construction and retrofitting of new
and old structures respectively. Hence, it is necessary to investigate the structural properties of high strength friction-grip bolts
used in steel concrete composite beams. By means of push-out tests, an experimental study was conducted on post-installed high
strength friction-grip bolts, considering the effects of different bolt size, concrete strength, bolt tensile strength and bolt
pretension. The test results showed that bolt shear fracture was the dominant failure mode of all specimens. Based on the loadslip curves, uplifting curves and bolt tensile force curves between the precast concrete slab and steel beam obtained by push-out
tests, the anti-slip performance of steel-concrete interface and shear behavior of bolt shank were studied, including the
quantitative analysis of anti-slip load, and anti-slip stiffness, frictional coefficient, shear stiffness of bolt shank and ultimate shear
capacity. Meanwhile, the interfacial anti-slip stiffness and shear stiffness of bolt shank were defined reasonably. In addition, a
total of 56 push-out finite element models verified by the experimental results were also developed, and used to conduct
parametric analyses for investigating the shear behavior of high-strength bolted shear connectors in steel-concrete composite
beams. Finally, on ground of the test results and finite element simulation analysis, a new design formula for predicting shear
capacity was proposed by nonlinear fitting, considering the bolt diameter, concrete strength and bolt tensile strength.
Comparison of the calculated value from proposed formula and test results given in the relevant references indicated that the
proposed formulas can give a reasonable prediction.
Key Words
high-strength bolt; steel-concrete composite beams; shear connectors; push-out tests; rapid assembling and
demounting
Address
Ying Xing:College of Civil Engineering, Hunan University, Changsha, 410082, China/ College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
Yanbin Liu:College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
Caijun Shi:College of Civil Engineering, Hunan University, Changsha, 410082, China
Zhipeng Wang:Economic & Technology Research Institute of State Grid Shandong Electric Power Company, Jinan 250021, China
Qi Guo:College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China
Jinfeng Jiao:College of Civil Engineering, Taiyuan University of Technology, Taiyuan, 030024, China