i-manager's Journal on Structural Engineering (JSTE)


Volume 10 Issue 1 March - May 2021

Research Paper

Fatigue Reliability Assessment of Aged Railway Plate Girder Bridge by Probabilistic S-N Curve Approach

Rajeeth T. J. * , G. Ravi **
* Department of Civil Engineering, Vidyavardhaka College of Engineering, Mysore, Karnataka, India.
** Department of Civil Engineering, The National Institute of Engineering, Mysore, Karnataka, India.
Rajeeth, T. J., and Ravi, G. (2021). Fatigue Reliability Assessment of Aged Railway Plate Girder Bridge by Probabilistic S-N Curve Approach. i-manager's Journal on Structural Engineering, 10(1), 1-8. https://doi.org/10.26634/jste.10.1.18073

Abstract

The expansion of the railway traffic during the last decades is considered as primary stage towards the evaluation of the remaining service life of the existing railway bridges. The objective of this paper is to review live loads, determination of fatigue damage and reliability index of the plate girder bridge. The assessment of the bridge has been made using Indian Standard code IS 800:2007, which is based on S-N curve approach. Data has been collected on train loads along a particular railway route and from the statistical analysis of the data, the representative train loads are identified which forms the load spectrum. The developed load spectrum is used to find the stress ranges and by applying S-N curve parameters, the damage calculation has been made and then the reliability index of the bridge is determined.

Research Paper

Effect of Floor Plan Shape on Seismic Responses of Base-Isolated Buildings

Abhishek Mishra* , Madan Chandra Maurya**, Faheem Ahmad Khan***
*, *** Department of Civil Engineering, Babu Banarasi Das University, Lucknow, Uttar Pradesh, India.
** Department of Civil Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur,Uttar Pradesh, India.
Mishra, A., Maurya, M. C., and Khan, F. A. (2021). Effect of Floor Plan Shape on Seismic Responses of Base-Isolated Buildings. i-manager's Journal on Structural Engineering, 10(1), 9-20. https://doi.org/10.26634/jste.10.1.18315

Abstract

In this present study, an effect of floor plan shape on seismic response of base-isolated buildings, linear modal time history analysis has been done on 9 models of 15 storey building. The modelling consists of different floor plan shapes buildings such as square shape plan, rectangular shape plan and H-shaped plan building with varying base such as fixed base, lead rubber bearing and friction pendulum system respectively. The Time History Analysis (THA) has been done on the base near fault ground motion dataof El Centro city taking IS 1893: 2016 into consideration. The seismic zone V and soft soil is selected for the THA of all the models. The modelling and analysis has been done with the help of software ETABS version 17.0.1 and the responses recorded are such as maximum storey displacement, maximum storey drift, maximum storey acceleration, maximum base shear, maximum absolute joint acceleration at the joint 1 of the top storey and modal time period. The responses recorded are compared on the basis of similar plan shapes with the different bases. As we all know that the population is growing extensively, so the need of multi-storey residential buildings is also increasing and hence they are exposed to seismic destruction in earthquake prone zones. In this study, efforts has been made to conclude how effectively LRB and FPS reduces such damages so that a structural engineer can enhance the stability of the structure and can save valuable life and money in earthquake prone zones.

Research Paper

Comparative Study on Strength and Permeability of Pozzolona Pervious Concrete Made with Three Different Sizes of Coarse Aggregate

Vailada Vinay * , Franklin**, Chandramouli Sangamreddi ***, Satya Chaitanya Vasanta ****, Bandaru Taruni *****
*-** Department of Civil Engineering, Andhra University, Visakhapatnam, Andhra Pradesh, India.
***-***** Department of Civil Engineering, MVGR College of Engineering, Vizianagaram, Andhra Pradesh, India.
Vinay, V., Adiseshu, S., Sangamreddi, C., Vasanta, S. C., and Taruni, B. (2021). Comparative Study on Strength and Permeability of Pozzolona Pervious Concrete Made with Three Different Sizes of Coarse Aggregate. i-manager's Journal on Structural Engineering, 10(1), 21-30. https://doi.org/10.26634/jste.10.1.17888

Abstract

An attempt has been made in the present study to compare strength and permeability of pozzolona pervious concrete made with three different uniform sized aggregates. The strength of pervious concrete mainly depends upon the proportions of which the concrete is made off and size of aggregate used. The combinations of cement and fly ash (for replacement of cement by weight) considered are, (FC1)10% fly ash, 90% cement; (FC2) 20% fly ash, 80% cement; (FC3) 25% fly ash, 75% cement; and (FC4) 30% fly ash, 70% cement. Also, the aggregate of sizes 10 mm (UA10), 12.5 mm (UA12.5) and 20 mm (UA20) have been used. Two different water-binder ratios (w/b) 0.35 and 0.4 are considered to study the strength and permeability. Tests are conducted to determine compressive strength and permeability for various combinations. The various results obtained are presented in detail. Higher w/b ratio shows lower values of compressive strength. Therefore, it is recommended to select proper w/b ratio before using the pervious concrete in the field.

Research Paper

Analytical Modelling and Experimental Validation of Balanced Reinforced Geopolymer Concrete Beams

Shankar H. Sanni*
Department of Civil Engineering, Basaveshwar Engineering College, Bagalkot, Karnataka, India.
Sanni, S. H. (2021). Analytical Modelling and Experimental Validation of Balanced Reinforced Geopolymer Concrete Beams. i-manager's Journal on Structural Engineering, 10(1), 31-39. https://doi.org/10.26634/jste.10.1.18068

Abstract

The present paper gives a brief outline of experimental work and also numerical analysis carried out on geopolymer reinforced concrete beams (GRCB) using ANSYS software. The Geopolymer Concrete (GPC) has been prepared for M-30, M-40 and M-50 grade concrete with molarity of 12 and alkaline solution (combination of NaOH and Na2SiO3) in the ratio of 2.50. The results obtained with geopolymer concrete were almost higher with the conventional concrete specimens, and this observation has been true in numerical analysis with ANSYS also. Hence itmay be concluded that the geopolymer concrete prepared with industrial waste materials like fly ash (FA) and ground granulated blast furnace slag (GGBFS) can be used as supplementary and eco-friendly material.

Review Paper

Overview on Fly Ash Based Geopolymer – A Review

Fatheali Allabaksh Shilar*
Department of Civil Engineering, KLE Technological University, Hubli, Karnataka, India.
Shilar, F. A. (2021). Overview on Fly Ash Based Geopolymer – A Review. i-manager's Journal on Structural Engineering, 10(1), 40-56. https://doi.org/10.26634/jste.10.1.17653

Abstract

Thanks to significant advances in mechanical development, the use of concrete has increased significantly in recent years, and the concrete industry generates about 1.35 billion tonnes of ozone depleting emissions each year, which is approximately 7% of all ozone depleting substances released into the environment. At the same time, thermal power plants generate a lot of fly ash that is not reused. This places a tremendous burden on effective waste management. As a result, a geopolymer innovation is one of the possible ways to limit CO2 emissions from the concrete industry and using fly ash effectively. In terms of harmful atmospheric degradation, geopolymer based fly ash actuated by soluble activators not only has the potential to reduce the carbon footprint of traditional Portland concrete cement, but also shows significant promise for applications in construction industry as an alternative to Portland cement. This article summarizes the current status of geopolymer adhesives and fly ash concrete, and reviews the most important research findings on various aspects of geopolymer concrete (GPB) in recent years. It also highlights important factors to consider when improving the performance of the GPC at elevated temperatures as well as at ambient temperatures.