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


Volume 2 Issue 2 June - August 2013

Research Paper

Pendulam Impact Test on RCC and SFRC Plates

S. Elavenil*
*Professor in Civil Engineering, School of Mechanical and Building Sciences, V.I.T.University (Chennai Campus),Vandalur, Chennai.
Elavenil, S. (2013). Pendulam Impact Test on RCC and SFRC Plates. i-manager’s Journal on Structural Engineering, 2(2), 1-8. https://doi.org/10.26634/jste.2.2.2381

Abstract

Concrete structures are often subjected to various types of dynamic forces. Fibre reinforcement improves the dynamic behavior of reinforced concrete plates under impact loading. The paper reports an experimental investigation on the dynamic behavior of Steel Fibre Reinforced Cement Concrete (SFRC) plates under pendulum impact test. The variables considered were percentage volume fraction of steel fibres, aspect ratio, the angle of impact and the thickness of the plate. The peak amplitude versus frequency behavior of Steel Fibre Reinforced Concrete plates was studied. The magnitude of amplitude increases in the order of 30% for Steel Fibre Reinforced Concrete plates fixed on two sides as compared to plates fixed on all four sides. The increase in aspect ratio of steel fibres shows a 30% higher frequency. It is observed that the drop in the peak amplitude is gradual for steel fibre reinforced plates fixed on four sides. Based on the peak amplitude versus frequency behaviour, the numerical expression for amplitude in terms of frequency is suggested.

Research Paper

Detection and Adjustment of NonstationaryCorrosion Measurements

Richard H. Mccuen* , Dawn E. Klinesmith**
* Professor, Department of Civil and Environmental Engineering, University of Maryland, College Park.
** Research Assistant, Department of Civil and Environmental Engineering, University of Maryland, College Park .
McCuen, R.H., and Klinesmith, D.E. (2013). Detection and Adjustment of Nonstationary Corrosion Measurements. i-manager’s Journal on Structural Engineering, 2(2), 9-16. https://doi.org/10.26634/jste.2.2.2382

Abstract

Traditionally, power models that are calibrated to compute corrosion loss of steel and other metals are based on time series of measured thickness losses. The models are based on the assumption that the environmental conditions remain constant over the period of data collection. Given changes in climate and air quality laws, an assumption of statistical stationarity for thickness loss measurements is almost certainly not rational. The goal of this study was to provide a framework for detecting nonstationarity in thickness loss data and then for adjusting the measured data found to be temporally nonhomogeneous. The adjusted values would then represent a specific environmental condition over the duration of the data collection. Specific statistical tests are recommended for the detection of nonstationarity. After nonstationarity is confirmed, a procedure to adjust the measured data to a stationary record is presented. The modeling framework is illustrated using two types of data: one-year corrosion loss data of zinc due to variation in atmospheric SO 2 concentrations and steel corrosion loss rates collected over a period of time when SO concentrations varied. The results 2 show that modeling atmospheric corrosion using nonstationary loss data can lead to inaccurate estimates of thickness loss. The adjustment of measured data to a constant environmental state will be beneficial in economic analyses, risk studies, and planning for changes in air pollution laws.

Research Paper

Behaviour of Bolted Cold-Formed Steel Angle Tension Members

Abida Justus* , R. Padmapriya**
* Lecturer, Department of Civil Engineering, Sathyabama University, Chennai, India.
** Associate Professor, Department of Civil Engineering, Sathyabama University, Chennai, India.
Justus, A., and Padmapriya, R. (2013). Behaviour of Bolted Cold-Formed Steel Angle Tension Members. i-manager’s Journal on Structural Engineering, 2(2), 17-25. https://doi.org/10.26634/jste.2.2.2383

Abstract

Tension members are frequently encountered as principal structural members in trusses and lateral bracing system in general construction and its connections are of significant importance in any steel design. The use of cold-formed steel tension members in variety of structures has increased these days. The main objective of the study is to investigate the behavior of cold formed steel single and double angle specimens. Forty eight experiments were conducted on single and double angles of different cross sections with single and double line connection. The cold formed steel angle specimens used in this investigation were fabricated from cold formed steel sheets of thickness 2mm by bending and press breaking operations. Eight single plain angle specimens, eight single lipped angle specimens and thirty two numbers of double angle specimens connected to the same side and opposite side of the gusset plate were tested in an Universal Testing Machine using ordinary black bolts of 10mm diameter. All the specimens were tested to failure. Various types of connection failure, Load vs deflection behavior were studied. Comparison of ultimate load calculated using BS 5950(Part V)-1998, AS/NZS 4600:2005 and experimental loads were also studied.

Research Paper

Use of Green Shade Net in Silt Soil in Highway Construction

Parveen Berwal* , Isha Verma**
* Faculty, Civil Engineering Deportment, BRCM College of Engineering and Technology, Bahal, Bhiwani, India.
** Faculty, Civil Engineering Deportment, University Institute of Technology, Maharishi Dayanad University, Rohtak, India.
Berwal, P., and Verma, I. (2013). Use of Green Shade Net in Silt Soil in Highway Construction. i-manager’s Journal on Structural Engineering, 2(2), 26-29. https://doi.org/10.26634/jste.2.2.2384

Abstract

As we all know construction industry is increasing day by day and there is a great need of aggregate in road construction and in building construction. This paper discusses the feasibility of using green shade fabric for application in road construction based on the laboratory investigation and field trial. Green shade fabric is made up of synthetic fiber such as polypropylene and polyethylene. These fibers are either as flat tape or threads woven or knitted in various way. The specific weight of the material is 0.97 and the melting point is 125-135°C. The fabric is holding good strength in soil and provides good resistance against the load. In this paper, test are done of different sample like sample 1, 2, 3 and sample 4 which are at ½, ¼, depth, at top and without fabric material. The results indicate that green shade net fabric can be used in road construction in case of silt soil, and holds a good promise for better improvement in road construction.

Research Paper

Bond Characteristics of Waste Plastic Fibre Reinforced Concrete - an Experimental Investigation

Prahallada M.C.* , Prakash K.B.**
* Professor, Department of Civil Engineering, Christ University Faculty of Engineering, Bangalore, Karnataka, India.
** Principal, Government College of Engineering, Haveri, Karnataka, India.
Prahallada, M.C., and Prakash, K.B. (2013). Bond Characteristics of Waste Plastic Fibre Reinforced Concrete - an Experimental Investigation. i-manager’s Journal on Structural Engineering, 2(2), 30-33. https://doi.org/10.26634/jste.2.2.2385

Abstract

The presence of fibres restricts the growth of creep and shrinkage strains and hence, the skin around the rebar in concrete has better resistance against pullout. Therefore, the bond strength increases by the fibre addition. The contribution of waste plastic fibres towards the bond strength characteristics of FRC is investigated in the present study. A total of 27 specimens were cast to study the variation in bond resistance due to variation in percentage of plastic fibres for the pre-fixed aspect ratio with centrally placed medium tensile steel bar as reinforcement. A definite increase in the interfacial force at the surface of reinforcing bar is observed, due to use of fibre reinforced concrete replacing ordinary concrete. The contribution of fibres in increasing the interfacial forces is evaluated in terms of increase over plain concrete.