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


Volume 10 Issue 2 June - August 2021

Research Paper

Estimation of Seismic Fragility in Structural Systems

Engammagari Ganesh* , M. K. Shrimali**, P. V. Ramana***
*-***National Centre for Disaster Mitigation and Management, Malaviya National Institute of Technology, Jaipur, Rajasthan, India.
Ganesh, E., Shrimali, M. K., and Ramana, P. V. (2021). Estimation of Seismic Fragility in Structural Systems. i-manager's Journal on Structural Engineering, 10(2), 1-12. https://doi.org/10.26634/jste.10.2.17936

Abstract

Dynamic analysis is used to estimate brittleness functions and is an essential part of many seismic measurement procedures. The multi-band method is more efficient than brittleness projections for a given variety of structural analyses than Dynamic Incremental Analysis (DIA), which means some understanding of building capacity is needed before analysis. The sufficient portions of the brittleness curve can be roughly described. This finding has alternative advantages because the multiple band analysis approach allows for many ground movements for studies of different intensity ranges to reproduce the various low and high-intensity tremor options. This article investigates the applicability of statistical inference methods to predict brittleness functions, describes practical strategies for use in various structural analysis techniques and examines brittleness functions that can be updated to minimize the number of brittleness. The proposed evaluation system also provides a basis for evaluating possible test methods in the future. Seismic brittleness analysis can be a probabilistic measure for assessing the seismic performance of structural components or systems such as seismic brittleness analysis, damage probability matrix and brittleness curve. The dynamic response of the variability of the system's parameters and the uncertainty on the structure's capacity is due to the imprecise environment of the models and the erraticism of the system's structures.

Research Paper

Experimental Investigation on the Behaviour of Longitudinally GFRP Reinforced Column Subjected to Eccentric Loading

Gurubasav S. Hiremath* , Vishal R. Jigajinni**
*-**Department of Civil Engineering, Basaveshwar Engineering College, Bagalkot, Karnataka, India.
Hiremath, G. S., and Jigajinni, V. R. (2021). Experimental Investigation on the Behaviour of Longitudinally GFRP Reinforced Column Subjected to Eccentric Loading. i-manager's Journal on Structural Engineering, 10(2), 13-20. https://doi.org/10.26634/jste.10.2.18392

Abstract

Use of rebars in compression has not been fully habitual. Many problems are threatening the durability of the material such as corrosion and subsequent loss of strength affecting the performance of steel reinforcement. To overcome this problem, novel materials such as Fibre Reinforced Polymer (FRP) rebars have been invented. FRP bars have higher strength to weight ratio than its steel counterparts and are non-corrosive. In this study, the performance of longitudinally reinforced Glass FRP (GFRP) bars in short columns of dimensions 200 mm × 150 mm × 800 mm subjected to eccentric loading has been carried out. The longitudinal reinforcement ratio varied from 1.51% to 2.26% by keeping constant the transverse reinforcement (steel stirrups) ratio. The short columns were subjected to a load at an eccentricity of 100 mm. Effect of replacement of steel rebars and increase in longitudinal reinforcement ratio is studied in terms of maximum deflection and maximum compressive load. From the experimental results, it is observed that the increase in longitudinal reinforcement ratio of GFRP reinforced column resulted in 4.5% higher load carrying capacity and 2.2% greater horizontal deflection compared to steel reinforced column.

Research Paper

Bending and Free Vibration Analysis of FGM Plate using ANSYS APDL

Madan Chandra Maurya*
Department of Civil Engineering, Madan Mohan Malaviya University of Technology, Gorakhpur, Uttar Pradesh, India.
Maurya, M. C. (2021). Bending and Free Vibration Analysis of FGM Plate using ANSYS APDL. i-manager's Journal on Structural Engineering, 10(2), 21-28. https://doi.org/10.26634/jste.10.2.18132

Abstract

In this paper bending and the free vibration analysis of Functionally Graded (FG) Plates has been done using Finite Element Analysis (FEA). The material properties of FGM which is mixture of metal and ceramic are used with the help of power distribution law of volume fraction which successively change over the depth of the plate. Here, for the analysis, finite element tool ANSYS APDL is utilized. For modelling of FGM plate, the whole plate is divided into various individual layer of composite having different distributed property over the thickness used as per power law distribution. Next, to check the accuracy of modelling, the result has been compared with the available result based on higher order shear deformation theory and good agreement was found with the available results. Based on this, bending and free vibration analysis has been done and results were generated for various aspect ratios of plate and also for various volume fraction exponent. It has been found that the distribution form of porosity significantly affects the mechanical behaviour of FG plates, in terms of deflection and frequency.

Review Paper

Review on Effect of Alkali Aggregate Reaction (AAR) and Internal Sulphate Attack (ISA) on Concrete Structures

A. Pavithra* , T. Raghavendra**
*-**Department of Civil Engineering, R V College of Engineering, Bengaluru, Karnataka, India.
Pavithra, A., and Raghavendra, T. (2021). Review on Effect of Alkali Aggregate Reaction (AAR) and Internal Sulphate Attack (ISA) on Concrete Structures. i-manager's Journal on Structural Engineering, 10(2), 29-36. https://doi.org/10.26634/jste.10.2.18351

Abstract

Concrete structures are susceptible to a variety of chemical reactions, with AAR and ISA being two of the most common processes that cause structures to deteriorate their durability. Improving the durability of concrete structures is an important and scientific challenge. AAR and ISA are slow processes, becoming noticeable 20 to 30 years after construction. This paper presents fundamental theory and concepts of AAR and ISA in concrete. AAR and ISA are caused due to the reactivity of aggregates along with alkalis and sulphates. Based on the previous research, AAR and ISA are further divided into Alkali Silica Reaction (ASR), Alkali Carbonate Reaction (ACR), Delayed Ettringite Formation (DEF) and Thaumasite Sulphate Attack (TSA). We can detect AAR and ISA with the help of evaluation methods. The aspects of AAR and ISA discussed include source, mechanism, investigations and preventive measures.

Review Paper

A Review on High-Rise Hybrid Structure

Sushma C. K.* , Dakshata B.**, Vijayalakshmi Akella***
*-**Department of Structural Engineering, Dayananda Sagar College of Engineering, Bengaluru, Karnataka, India.
***Department of Civil Engineering, K. S. School of Engineering & Management, Bengaluru, Karnataka, India.
Sushma, C. K., Dakshata, B. and Akella, V. (2021). A Review on High-Rise Hybrid Structure. i-manager's Journal on Structural Engineering, 10(2), 37-43. https://doi.org/10.26634/jste.10.2.18362

Abstract

RCC structures are preferred in most of the construction as they possess higher stiffness accompanied with low cost. RCC structural systems provide a very good shear and lateral stiffness. Nonetheless, RCC skeleton is considered uneconomical for tall buildings as there is an increase in dead load, complicated formwork, restrictions for longer length and poor performance in earthquake conditions. On the flip side, though the steel in construction has got endless advantages concerning the speed of construction, high strength and light weight nature specifics like buckling, rust, fire resistance and availability of well-trained labour puts the use of steel in high rise buildings to a check. Hence hybrid construction is considered suitable for a high-rise structure. This paper reviews the performance of the buildings with RCC and steel along with Hybrid structures regarding cost, time of construction and seismic parameters.