Journal Articles

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884

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Author: search.filters.author.Chethan, K.

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    Influence of masonry infill on fundamental natural frequency of 2D RC frames
    (2010) Chethan, K.; Ramesh Babu, R.; Venkataramana, K.; Sharma, A.
    Reinforced Concrete (RC) framed structures with Un-Reinforced Masonry (URM) infill panels form a major portion of all the RC framed structures worldwide. The URM panels are considered as non-structural members, which is fairly good assumption under gravity loads, however, it is not the same under lateral forces. Under seismic loads, the stiffness additions due to infill panels modify the dynamic behavior of the structure significantly by altering the frequency of the structure. A research project has been taken up at Earthquake Engineering and Vibration Research Centre (EVRC), Central Power Research Institute (CPRI), Bangalore to investigate the influence of masonry infill on fundamental natural frequency of RC frames. 2D RC frames of one bay and two bay having single storey, double storey and three storeys are cast and tested for bare frame and many combinations of URM infill panels. Tri-axial shake table is used for testing. The details of the numerical analysis and experimentation carried out in the research project are brought out in this paper.
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    Studies on the influence of infill on dynamic characteristics of reinforced concrete frames
    (CAFET INNOVA Technical Society 1-2-18/103, Mohini Mansion, Gagan Mahal Road, Domalguda, Hyderabad 500029, 2011) Chethan, K.; Ramesh Babu, R.; Venkataramana, K.; Sharma, A.
    The basic investigation under dynamic loads starts with the estimation of the natural frequencies of the structure or system under consideration. This is an important parameter under dynamic analysis. Hence a detailed study has been carried out on the influence of masonry infill (MI) on fundamental natural frequency of RC frames. MI though considered as non-structural element largely affect the strength, stiffness and ductility of the framed structure during the application of lateral forces such as wind and earthquake loads. Experimental and Numerical studies are carried out on RC frames under different configurations of MI in addition to bare frames. The RC frames are designed and detailed as per the relevant Indian standard codes. A simple numerical method has been formulated to obtain the natural frequencies of RC frames with MI using FE analysis. Tri-axial shake table is used for the determination of natural frequencies experimentally. This is a part of the collaborative project between BARC, Mumbai and CPRI, Bangalore focusing on the Response evaluation of RC frames under dynamic loading. This paper consists of numerical formulation, FE analysis, Shake table tests and comparison of results. © 2011 CAFET-INNOVA TECHNICAL SOCIETY. All rights reserved.
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    Studies on the dynamic characteristics of monolithic RC wall panels
    (2013) Amitha, S.B.; Chethan, K.; Bhavanishankar, S.; Annapurna, B.P.; Venkataramana, K.; Ramesh Babu, R.
    Monolithically built RC wall panels permits for the industrialized construction of a group of integrated buildings using mechanized, rationalized and mass-production procedure. This is a unique, fast and economical technique. Most of the national and international codes comprise of a brief design procedure of this type of construction. Lot of research is being carried out worldwide about the effect of dynamic loads on these structures. In this paper, FE analysis is done on a designed typical monolithic RC wall panel structure for all zones as per Indian code and the results are compared with different international codal provisions and the formulae presented by Saheb & Desayi and Doh & Fragomeni. This paper consists of background, design and construction of monolithic RC wall panel, FE analysis and comparison of results. © 2013 CAFET-INNOVA TECHNICAL SOCIETY.
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    Effect of Elevated Temperatures on Sugarcane Bagasse Ash-Based Alkali-Activated Slag Concrete
    (Springer, 2021) Kumar, D.S.S.; Chethan, K.; Kumar, B.C.
    The main focus of researchers in construction sector is to check suitability of ecofriendly alternative materials. Sugarcane bagasse ash (BA) and steel slag (SS) is one among such ecofriendly alternative materials. BA and SS has potential to utilize as binder and coarse aggregate, respectively, in concrete production. In the present investigation, BA and SS were utilized in alkali-activated slag/bagasse ash concrete (AASBC) mixture production. Full factorial experimental design was considered with two input variables, i.e., BA (0, 25, and 50%) and SS (0, 50, and 100%) as replacement to ground granulated blast furnace slag and natural coarse aggregate, respectively. Effect of elevated temperatures on BA and SS-based AASBC mixture were examined. Field emission scanning electron microscope study were carried out to check the morphological changes in ambient and elevated temperature condition. In order to rank different BA and SS-based AASBC mixture performance multi-criteria optimization techniques like, grey relational analysis, technique for order preference by similarity to ideal solution, and desirability function approach were utilized. AASBC mixture with 25% BA content and 100% SS content found to be most suitable AASBC mixture based on multi-criteria optimization technique under elevated temperature conditions. © 2020, Society for Sugar Research & Promotion.