Civil

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

School of Civil Engineering

Construction industries in these days are giving more importance to precast concrete to reduce the construction time. Precast concrete elements can be made by accelerating the hydration process in high early strength concrete (HESC). In this paper we analyzed different methods to achieve high early strength concrete. A detailed review on achieving the high early strength in concrete are discussed and it also explains the strength behavior of pozzolona in high early strength concrete. © 2017 IAEME Publication.

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Chennai Campus

International Journal of Civil Engineering and Technology

Review on high early strength concrete

The study of past histories has been shown that the buildings are disposed to severe damage during a strong seismicity. These buildings are striking to each other due to imperfect design and different dynamic properties. Hence to prevent the collapse of buildings, Indian Standards suggest that the minimum separation gap should be provided to prevent colliding of adjacent buildings. Structural pounding occurs when two adjacent buildings collide. Earthquakes can cause pounding when adjacent buildings have little or no gap providing separation. This paper examines the dynamic evaluation of a concrete structures and pounding effects with multiple heights of buildings for time history analysis and response spectrum analysis by using ETABS. The results were obtained in the form of point displacement and pounding force. The effect of pounding is more when the structures are kept at extreme levels of setback. The collision force is developed at the mid height of structure. Proper separation distance was proposed to prevent the linear pounding and torsional pounding. Also by providing shear wall, effect of pounding reduces.

Journal of Industrial Pollution Control

Linear and non-linear dyamic evaluation of concrete structures due to pounding effects

A high rise building has to be designed to resist lateral loads due to wind or earthquake. Interior structural system or exterior structural system provides the lateral load resistance to the structure. The shape, structure and material used also influence the behaviour of structure against lateral loading. In this study three dimensional analytical models of G+12 storied buildings have been generated for regular and irregular buildings and analysed using CSI ETABS software (2015 version) for earthquake zone III in India. The objective of the project is to carry out seismic analysis (RSA) of regular and irregular reinforced concrete buildings and to carry out the ductility based design using IS 13920. Results of this analysis are discussed in terms of story displacements, story drifts, story shear and stiffness. From the results it is concluded that story displacements increases linearly with height of the building; maximum storey drift is observed at second floor for irregular structure and at fourth floor for regular structure; maximum storey shear force was observed between ground floor and second floor for regular structure and at ground floor for irregular structure and the value decreases linearly with height; storey stiffness varies non - linearly for both the structures with maximum values at ground floor. © IAEME Publication.

Seismic analysis of high rise buildings with plan irregularity

Steel structures are the most common and smart choice for industrial construction they are basically because of its ability to create large span space at low cost. Along with the existence of Conventional Steel building (CSB), the PEB came into being from 1960s. The methodology tracked followed in PEB is highly multifaceted not just because of the quality in pre-designing and pre-fabrication but also due to the light weight outcome and economically sound factor. In this study, using SAP 2000-18 the truss chord members are designed for different sections such as ISLC/ISA, UB/UC and SHS. The most economic truss chord sections is utilised for the design of the industrial building, the industrial buildings are thus designed to carry out wind analysis with different bracings such as X- bracing, diagonal bracing and k- bracing. Therefore, the most optimised structured is then compared with PEB structure for the same parameters. © IAEME Publication.

Wind load analysis for industrial building with different bracing patterns and its comparison with pre engineered building

In this study, the behavior of micro steel (1%) and polypropylene fibers (0. 25% and 0. 50%) in concrete under the impact load were investigated. The mechanical properties such as compressive strength (by dry and normal curing methods) and splitting tensile strength of the concrete designed for 50 MPa were evaluated. The results show that the impact strength and splitting tensile strength were increased with the incorporation of steel and polypropylene fibers. Based on the splitting tensile strength and impact strength an empirical relationship was found to predict the impact energy from splitting tensile strength of the concrete. The empirical relationship exhibited good relationship with the percentage of difference between experimental and predicted value lesser than 6%. The test results also showed that the compressive strength of normal and fiber reinforced concrete attained target compressive strength by normal curing at 28 days. © The Indian Concrete Journal September 2017.

Indian Concrete Journal

Performance of micro steel polypropylene fiber reinforced concrete under impact load

Structural design and analysis produces the capability of resisting all the applied loads without failure during its intended life. The design of high rise buildings is governed by lateral loads mainly due to earthquake. The interior structural system or exterior structural system provides the resistance to lateral loads in the structure. The present paper describes the analysis and design of high rise buildings with Steel Plate Shear Wall (SPSW) for (G+9) stories. The properties of Steel plate shear wall system include the stiffness for control of structural displacement, ductile failure mechanism and high energy absorption. The design and analysis of the composite building with steel plate shear wall is carried out using software ETABS. The present study is to carry out the response spectrum analysis of a high rise composite building by optimizing the thickness of steel plate shear wall and to compare the results of displacement, story drift, overturning moment and story shear. The models are analysed by Response Spectrum analysis as per IS 1893:2002. All structural members are designed as per IS 800:2007 considering all load combinations. © IAEME Publication.

Design and analysis of high rise building with steel plate shear wall

In the present scenario there is increase in demand for structural members without expansion joint as per architectectural and aesthetic appearance like malls, commercial spaces, office buildings, IT parks. Indian Standard code, IS-456:2000 states buildings longer than 45m be analysed for the thermal stresses and appropriate measures should be taken during erecting the structural system, whereas IS codes are negligent towards such kind of designs as well as considering temperature load factors along with gravity loads. Added to it there are no proper guidelines available with design engineers to arrive at design temperature value that should be considered during design. This study mainly deals with design and analysis of structures of length 80m, 138m and 180m with and without expansion joints. Changes in stress at different levels, torsion on the peripheral beam and overall increase in steel quantity on the structure after imparting temperature loads during the design of a structure. © IAEME Publication.

Investigation of flat slab structures with and without expansion joints for thermal stresses

This study is focused to improve strength and durability properties of green concrete with E-waste as fine (10%, 20% and 30%) and coarse aggregates (5%, 10% and 15%) replacement in fibre reinforced green concrete with 30% of ground granulated blast furnace slag (GGBS) for the replacement of cement. Since the reuse of electronic waste and the waste industrial by-product GGBS was used in this study, this also aims to design a green concrete with E-waste. The findings from this study show that E-waste as fine aggregate attained lesser compressive strength, whereas E-waste as coarse aggregate replacement exhibited similar compressive strength compared to control concrete. The results of splitting tensile strength and flexural strength of E-waste as fine and coarse aggregate replacement mixtures were superior to that of normal concrete. The chloride ion penetration of control concrete was low, whereas for E-waste concrete mixtures moderate chloride ion penetration was observed. The overall performance of E-waste as fine and coarse aggregates replacement in compressive strength, splitting tensile strength, flexural strength and chloride ion penetration was due to the combined pozzolanic action of GGBS, increase in the tensile behaviour due to the presence of steel fibres and good bonding of E-waste aggregates.

Nature Environment and Pollution Technology

Performance of recycled e-waste as aggregates in green concrete

Beam-Column joints are critical regions in reinforced concrete crete or RCC structures which are most vulnerable or sensitive to seismic forces. Hence strengthening and rehabilitant beam-column joint is imperative to save the structure and its inhabitants in case of earthquake forces. Numerous and large scale retrofitting ting works using fibre reinforced polymer (FRP) composites are being undertaken worldwide. This experimental study aims to investigate the effectiveness of strengthening beam-column joints using synthetic fibres. In this study, Aramid fiber (synthetic fibres) was used for strengthening and rehabilitant of beam-column joints. Many specimens were prepared and tested under monotonic loading with the help of universal testing machine. At the end, test results of control and rehabilitated samples were compared together. The experimental conclusions in all tested specimens will embolden future investigations in same direction for long term performance to enhancing this AFRP in structural applications. © IAEME Publication.

Seismic rehabilitation of RCC beam-column joint

Release of high pressure air due to some ignition of bombs and explosives that causes explosions is called as blast. Bombsare used in various works such as in construction of tunnels for road and railways, fattening of buildings so that new construction can take place. In some area explosions are used for creating terror among the citizen like terrorist use vehicle bombs, other places where explosions likely occur is in nuclear power plants where due to unsafe isolation could lead to devastating explosions. The paper presents a design concept for containment vessel that need to withstand internal explosions. ABAQUS software is used for numerical simulation of containment vessel. Parametric studies are carried out using the proposed model of containment vessel. It is observed from the studies that the pressure versus time, displacement versus time and the strain energy curve for blast containment vessel is obtained.