Effective Vertical load Resisting System ("Bi-axial voided slab" )

Abstract

Sustainable development is a pattern of resource use, that aims to meet human needs while preserving the environment so that these needs can be met not only in the present, but also for generations to come. As the structural egg., on a planet with - nite natural resources and an ever-growing built environment, engineers of the future must consider the environmental, economic, and social sustainability of structural design. It is the design and construction practices that signi cantly reduce, or elim- inate the negative impact of buildings on the environment and its occupants with regard to site planning; by structural design; safeguarding water use and water use e ciency; promoting energy e ciency and renewable energy; conserving materials and resources; and promoting indoor environmental quality. For the sustainability related to the structural design, there are various alternatives are present. If we talk about the roo ng technique, for the roo ng generally con- crete slabs are used. Among that hollow-core slabs were invented in 1950. These are prefabricated, one way spanning, concrete elements with hollow cylinders. This is inexpensive, and reduce building time, and also reduce the cement consumption, but can be used only in one-way spanning construction, and must be supported by beams and/or xed walls. Due to the limitations in hollow-core slabs, several methods have been introduced during the last decades, but with very limited success, due to major problems with shear capacity and re. In the 1990s, a new system was invented, elim- inating the above problems. The so called Bi-axial voided slab by Jrgen Breuning, locks ellipsoids between the top and bottom reinforcement meshes, thereby creating a natural cell structure, acting like a solid slab. For the rst time a voided biaxial slab is created with the same capabilities as a solid slab, but with considerably less weight due to the elimination of super uous concrete. Nowadays world is facing problem of global warming, which is mainly responsible for the carbon emission. There is a great energy consumption and carbon emission vi in manufacturing of the concrete. In Voided-slab system, concrete is replaced by the ellipsoid made up by the plastic wastes, which replace the 30 % to 50 % concrete compare to the normal slab. So this system is environmentally green and sustainable - reduces energy and carbon emission. Concrete building can be considered as large energy consuming items in the Indian construction industry. So in manufacturing of di erent materials or building component great energy is consumed and which results in CO2 emission. Concrete is the major energy consuming material, and it can be replaced by the plastic spheres, which reduce the carbon emission and utilize the plastic waste. The present study is an attempt to understand the exact behavior of the Bi-axial voided slab. There are chances of reduction of the strength and di erent failure pat- tern than the normal concrete slab. Main objective of the study is to compare the parameters like de ection, strain and failure pattern. For this purpose eight slab panel were cast with di erent thickness, di erent sphere size. Load-de ection, load-strain parameters are compared for better understanding of the behavior of the bi-axial voided slab. Comparison is also done according to economical point of view. From the result obtained, Load multiplication factor is established in both Flex- ure and Punching shear test condition. In case of the Voided slab, at the time of the calculating the Shear stress, the load should be multiplied by the factor 1.15 com- bining with the partial safety factor and at the time of the calculating the Bending moment, the load should be multiplied by the factor 1.1 combining with the partial safety factor.