Journal of Structural Technology (e-ISSN: 2581-950X)

Use of PET Fibre as Constituent of Concrete

Vinod L. Patil — 2016-12-21

A fibre reinforced concrete is a mixture having the ingredient cement, sand, aggregate with PET Fibre. As we know that the fiber can not be decomposed. Development in the technology of preparing of concrete mix is necessary. So we are using the fibre as constituent of the concrete The concrete mix which is made with the use of fibre have high cement quantity and low water quantity The fibre reinforced concrete carry more load as compare to the plain concrete. The concrete without fibre fail suddenly one the ultimate flexural strength exceed as compare to the fibre mixed concrete Today we required the cost effective material which increase the concrete strength . Hence we are trying and doing research by addition of waste material like fibre. This paper gives the results of various strength of concrete Key Words: PET Fibres, workability, compressive strength, flexural strength, split tensile strength, bond strength

A Study on Web Buckling Analysis of Lipped Channel Sections and Z Sections With Web Holes

Ahana K. Reji — 2016-10-12

Cold formed steel (CFS) beams are produced by generally by two methods namely, Roll forming and Break pressing. These members have a wide range of applications in Cladding panels and decking, Stud frames and other fabricated structures. Local wall thickness to height ratio causes cold formed steel sections to undergo local buckling. However the use of cold formed steel sections are increased now a days due to the improved post buckling behaviour. CFS sections with web openings are commonly used in floor joists or wall studs in industrial, commercial and residential buildings. Theses opening provide for building services causes reduction in the strength of the sections. In most of the CFS sections with web holes in them, channel sections are found to be used widely. Z sections are also used widely in this field, however no researches has been done in Z sections with the effects of web holes. IS811:1987, provides specifications for lipped channel sections and Z sections. This study mainly concentrates on a comparative study of the web buckling analysis of lipped channel sections and Z sections. Non-linear elasto plastic finite element analysis are used to study the effect of web holes on web buckling analysis under interior two flange loading conditions
(ITF) and interior one flange loading conditions. This finite element model was then used for the parametric study on the effect of different size and position of web holes. Various codes were also used to study the effect of different size and position of web holes in the load carrying capacity of the section.

Design And Analysis of Intertank Structure For Cryogenic Stage

Arunima s — 2016-11-14

In cryogenic stages of ISRO, Liquid Hydrogen (LH2) is used as fuel and Liquid Oxygen (LOX) is used as the oxidiser. Both are stored in propellant tanks at cryogenic temperature. These propellants tanks are arranged in tandem with the intertank structure in the middle which at ambient temperature. Tanks being at cryo temperature contract radially imparting large thermal stresses on intetank. Hence the design of intertank structure requires special attention to nullify this thermal stresses. Currently, intertank structures are made of truss rods which allow radial contraction through spherical joints at both ends. However this configuration introduces large concentrated loads at truss interfaces resulting at higher structural mass. A more plausible approach is to design a stiffened cylindrical structure with provision for radial sliding to minimize thermal stresses. The joint is inserted radially from the outer diameter of the two interfacing flanges. On the application of temperature gradient, it allows free radial movement and prevents stress built up on the account of temperature. This paper envisages the configuration, design and analysis of an intertank structure with cylindrical shell construction with provision for neutralizing thermal stresses which is planned to be introduced in future cryogenic stages of ISRO