Abstract
In light of their confinement effect, composite columns were frequently chosen in modern construction procedures over reinforced concrete columns. The outer confining tube was made of various materials, which are primarily distinguished through their mechanical characteristics. The fundamental purpose of this research is to evolve an ingenious artificial neural network simulation that is more straightforward and can be utilized to calculate the ultimate load carrying capacity of self-stressed columns irrespective of the category of impounding tube deployed. The most recent experimental findings associated with the composite columns were utilized in the creation of a database. This database is employed for training, testing, and validating the machine learning model. Following the contemporaneous experimental research, several composite columns were chosen for further examination, and the model that was developed was utilized to validate the ultimate axial load of the columns.
Key Words
ANN; expansive cement; PVA fibers; self-stressed; shrinkage
Address
P. Krithika: Department of Civil Engineering, SRM Institute of Science and Technology, Kattankulathur, Chengalpattu, Tamil Nadu, India
P. Gajalakshmi and M.Y. Mohammed Asif: Department of Civil Engineering, B.S. Abdur Rahman Crescent Institute of Science and Technology, Vandalur, Chennai, Tamil Nadu, India
Abstract
This paper presents the stress analysis of spur gear made from natural fiber reinforced polymer matrix composite material. These gears provide better alternative for replacing metallic gears. In this work epoxy resin is used as matrix material. Fly ash, coir fiber and carbon nano tube are used as reinforcement materials. Response surface methodology, one of the design of experiment approaches, is used to arrive the different material combinations. Static structural analysis is performed to obtain stress distributions and deformation. Analysis of variance (ANOVA) is employed to get optimized combinations for maximum stress. Analysis reveals that these gears can be used in low strength applications.
Key Words
analysis of variance; epoxy resin; finite element analysis; natural fiber; response surface methodology
Address
Venkatachalam Gopalan: Centre for Advanced Materials and Innovative Techniques, Vellore Institute of Technology,
Chennai, 600127, India
Hitesh Byatarayanapura Narayanaswamy,
Mitai Mallikarjuna and Jeyanthi Subramanian: School of Mechanical Engineering, Vellore Institute of Technology, Chennai, 600127, India
Vignesh Pragasam: School of Mechanical Engineering, Vellore Institute of Technology, Vellore, 632014, India
Aravindh Sampath: Mechanical Engineering Department, New Prince Shri Bhavani College of Engineering and Technology, Chennai, 600073, India
Abstract
The main objective of this paper is determining comfortableness of a composite structural floor system known as Chromite. For this purpose, twenty eight Chromite panels were developed via Finite Element Method (FEM) to find their Fundamental Natural Frequency (FNF). Then, the studied panels categorized as Low Frequency Floor (LFF) or High Frequency Floor (HFF) regarding to their FNFs. Peak accelerations of low and high frequency panels and also static stiffness of high frequency panels were determined and compared with the limit value affirmed by American Institute of Steel and Construction (AISC). Effect of various parameters such as dimension of panel, boundary conditions, rigidity of main beam, adding tie beam, thickness of concrete slab, height of composite joist, space between the joists, rigidity of secondary beam, grade of concrete, damping of panel, and type of path were determined on changing FNF and also peak acceleration and static stiffness of the studied panels, depend to kind of panel as LFF or HFF. The results demonstrated that although some factors decreased and increased peak acceleration and static stiffness of the Chromite system, respectively, the panels could reach high vibration levels resulting in lack of comfortableness for users. In addition, the results show that the Chromite floor system needs to improve to be comfort for users.
Key Words
chromite floor system; comfortableness; human walking load; low and high frequency floor; static and dynamic response
Address
Farhad Abbas Gandomkar: Department of Structure, Faculty of Civil Engineering, Jundi-Shapur University of Technology, Dezful, Iran
Wan Hamidon Wan Badaruzzaman: Chairman of Smart and Sustainable Twonship Research Centre (SUTRA), Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor Darul Ehsan, Malaysia
Abstract
Currently, in steel erection work in Japan, the wireless steel erection method, which introduced high-strength erection alignment devices to temporary column-to-column joints, is the mainstream method. Due to the tendency for the critical pass to the welding process in order to shorten the construction process, the range of steel frames in a temporary state will expand and its term will be prolonged. Consequently, the importance of seismic safety considerations to temporary column joints grows because of the increased probability of damage and the scale of earthquakes. This study proposes new methodology for evaluation of strength of the temporary column joints with the special alignment devices using finite element (FE) modeling which verifies the seismic safety of steel frames during erection. To this end, it implemented the simulation study of pushover experiments of the temporary column joints (solid models) of square steel tube columns, and the results such as the stress and deformation properties of each component were compared with those calculated by the general conventional stress calculation method, and its validity was confirmed.
Key Words
FEM; seismic; steel structures; temporary column joints; under construction; wireless steel erection method
Address
Koji Moriya: Graduate School of Simulation Studies, University of Hyogo, 7-28 Minatojima-minamimachi, Chuo-ku, Kobe City, Hyogo 650-0047, Japan
Taiki Hirata: Temporary Construction Business Division, Technos Co., Ltd, 2-1Honohara, Toyokawa City, Aichi 442-0061, Japan
Tomoharu Saruwatari: Engineering Technology Division, JSOL Corporation, Tosabori Daibiru Building 2-2-4 Tosabori, Nishi-ku, Osaka City 550-0001, Japan
Yasuyuki Nagano: Graduate School of Disaster Resilience and Governance, University of Hyogo, East Wing, Disaster Reduction and Human Renovation Institution 1-5-2 Wakinohama Kaigan-dori, Chuo-ku, Kobe City, Hyogo 651-0073, Japan
Abstract
Laminate composite structures are employed in industries due to their exceptional stiffness-to-weight ratio and directional properties. Literature has investigated the pursuit of optimal designs for such structures. In this paper, water cycle algorithm (WCA) is utilized as a metaheuristic optimizer algorithm for single and multi-objective optimization problems. Design variables include the number of layers and the orientation angle of fibers within each layer. A comparative analysis is performed to evaluate the efficacy of the WCA in comparison to other well-established optimizers. The obtained optimization results yield valuable insights into laminated composite structures, affirming the applicability of the proposed methodology in composite structural design.
Key Words
composite laminate; effective stiffness; metaheuristics; multi-objective optimization; water cycle algorithm
Address
Hadi Eskandar: Department of Mechanical Engineering, Semnan University, Semnan, Iran
Ali Sadollah: Department of Mechanical Engineering, Faculty of Engineering, University of Science and Culture, Tehran, Iran
Mojtaba Sheikhi Azqandi and Saeed Rahnama: Department of Mechanical Engineering, University of Birjand, Birjand, Iran
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