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


Volume 1 Issue 2 June - August 2012

Research Paper

Factors Important in Developing Regional Steel Corrosion Models

Meghan O'dea* , Frank C. Graham**, Richard H. Mccuen***
* Department of Chemical Engineering, University of Maryland, College Park.
** Department of Aerospace Engineering, University of Maryland, College Park.
*** The Ben Dyer Professor, Department of Civil and Environmental Engineering, University of Maryland, College Park.
O'dea, M., Graham, F.C., and Mccuen, R.H. (2012). Factors Important in Developing Regional Steel Corrosion Models. i-manager’s Journal on Structural Engineering, 1(2), 1-10. https://doi.org/10.26634/jste.1.2.1926

Abstract

Existing models for predicting long-term corrosion rates are generally power models with exposure time as the independent variable, with separate models for steel type and environment (i.e., urban, rural, marine). An international data base, with data from eight countries (Belgium, France, Germany, Great Britain, Japan, South Africa, Sweden, and the U.S.), was analyzed to examine the effects of exposure time, sample replication, sample size, steel type, the angle and direction of exposure, and the environment. Four steel types were included in the data: A588, A242, copper, and carbon. The results indicate that a global model would not provide accurate predictions, but it was possible to regionalize data for central Europe. Replication of samples was shown to be important for some types of steels in urban and marine environments, but not important for rural environments. The duration of exposure is very important, with some exposure durations being much more important than others. North-facing specimens were shown to corrode more than those facing south, and vertical specimens corroded more than those exposed at an angle of 30°. The amount of corrosion varied with steel type, but less with the country in which the data were collected. These results indicate that corrosion model accuracy can be improved by accounting for these other factors.

Research Paper

Studies on Plastic Mixed Concrete with Conventional Concrete

S. Saravanan* , M.R. Akarsh**, S. Elavenil***
* Assistant Professor, Sri Muthukumaran Institute of Technology, Chennai.
** PG student, SRM University, Chennai.
*** Professor, SRM University, Chennai.
Saravanan, S., Akarsh, M.R., and Elavenil, S. (2012). Studies on Plastic Mixed Concrete with Conventional Concrete. i-manager’s Journal on Structural Engineering, 1(2), 11-17. https://doi.org/10.26634/jste.1.2.1927

Abstract

Large quantity of waste plastic could be disposed in an environmental friendly manner. Currently, most researches are focused on determining a good way to eliminate waste by using it as alternative material in the applications of civil and industrial engineering. The waste plastic materials could be powdered and mixed with the concrete and used for fabrication of structural elements. Advanced composites such as fiber reinforced plastics (FRP) are promising and competitive materials that have great potential for use in high value added applications due to their superior characteristics in terms of high stiffness, low density and water absorption, high tensile strength, corrosion resistance and being used in a number of applications. The main aim of this study is to find out an environmental friendly way of disposing waste plastic by reusing principle and to study the behavior of plastic mixed concrete. In this study, the effective ways to reutilize the plastic waste particles as filler is analyzed. The strength characteristics of concrete containing recycled waste plastic material are determined.

Research Paper

Reinforced Beam Column Corner Joints: Analytical and Experimental Study

Manpreet Kaur* , Roshan Lal**
* Assistant Professor, Department of Civil Engineering, PAU, Ludhiana, Punjab, India.
** Associate Professor, Department of Civil Engineering, PEC University of Technology, Chandigarh, India.
Kaur, M., and Lal, R. (2012). Reinforced Beam Column Corner Joints: Analytical and Experimental Study . i-manager’s Journal on Structural Engineering, 1(2), 18-25. https://doi.org/10.26634/jste.1.2.1929

Abstract

Beams and columns are the back bone of every structure. The principles of detailing and structural behavior are well established for simple structural members such as beams and columns. On the other hand, the detailing, strength and behavior of corner joints, especially those subjected to opening bending moments have not been conclusively investigated. The present work has, therefore, been planned to investigate the behavior of reinforced concrete corner joints with three detailing arrangements subjected to opening bending moment. The objective of this study is to investigate and identify the detailing system promising best structural performance and also to analytically analyze the selected detailing system by using finite element software ANSYS. Concrete is represented by eight nodded element and the reinforcement is represented by two nodded bar element embedded in the concrete elements. Newton-Raphson’s method is employed for the non-linear solution algorithm and a displacement criterion is adopted for checking the convergence of the solution. There is a good agreement between analytical and experimental results.

Research Paper

Non-Linear Transient Vibration Analysis of plates using Modified Linearization Technique

Rajesh Kumar*
*Structural Engineering Division, Department of Civil Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, India.
Kumar, R. (2012). Non-Linear Transient Vibration Analysis of plates using Modified Linearization Technique. i-manager’s Journal on Structural Engineering, 1(2), 26-35. https://doi.org/10.26634/jste.1.2.1928

Abstract

A new numerical technique known as the multi-step transversal linearization (MTL), which is developed within a finite element framework is presented for non-linear transient behavior of isotropic and stiffened plates. In the MTL approach, the non-linear parts of the vector fields are converted to a set of equivalent and conditional forcing terms. These forcing terms are so constructed that the linearized vector field remains identical with the original one at a chosen set of discretization points distributed spatially across the domain of the problem. In the present work, Lagrangian interpolation functions are used to semi-discretize the non-linear part of the operator over the spatial domain. The conditionally linearized vector field thus constructed is transversal to the original vector field at all points of discretization. These operations finally result in a set of non-linear ordinary differential equations for the solution vector, which are solved using Newmark integration technique.

Research Paper

Rehabilitation of Damaged Reinforced Concrete Structure –a Case Study

H.S. Jadhav* , S. N. Patil**
* Associate Professor & Head, Civil Engineering Department, Rajarambapu Institute of Technology, Maharashtra, India.
** Assistant Professor, Civil Engineering Department, Rajarambapu Institute of Technology, Maharashtra, India.
Jadhav, H.S., and Patil, S.N. (2012). Rehabilitation of Damaged Reinforced Concrete Structure –a Case Study. i-manager’s Journal on Structural Engineering, 1(2), 36-41. https://doi.org/10.26634/jste.1.2.1925

Abstract

This paper presents an assessment of damages caused due to deterioration of concreteand corrosion of reinforcementon account of leakage, ageing and environmental factors throughnon destructive tests1.The pre and post evaluation of rehabilitation was carried out through load tests.In this study, a60year old rectangularReinforcedConcrete(RC) water tank builtover the terrace of the office buildingwas investigated2. It exhibited some cracks and spalling of concrete at certain locations. Two beams and one column were subjected to corrosion of reinforcement and deterioration of concrete. During its service life, the maintenance and repair work of the tank was carried out periodically. Damaged beams and column were repaired by providing new reinforcementwithcement grouting and polymer mortar. The deflections in the beam were measured at each stage of loading and unloading at regular intervals. These deflections were found within permissible limits and structural members were restored for their functional requirements3.