Possibilities and limitations of high-strength lightweight fiber-reinforced concrete structures

Abstract

Abstract The paper shows the study of the possibilities, limitations in the design of structures made of high-strength lightweight fiber-reinforced concrete and its use in the construction of a high-rise building using the LIRA SAPR software package. The calculations of the finite-element spatial model show that compared to heavy concrete, using high-strength lightweight fiber-reinforced concrete in the multi-storey buildings construction provides a large number of advantages, such as: reducing deflection of the building from its own weight up to 44.0%, from effect to wind loads - by 2,4 … 2.6% with a decrease in the period of the first 3 vibrations of the building structure by 11.3%; an increase in the number of storeys to 7 floors without changing foundation bearing capacity; increasing specific usable area per 1 m2 of building land by 26.6%; reducing consumption of materials for the foundation while maintaining the number of storeys of the building or the possibility of construction in weak soils. At the same time, the technology of high-strength lightweight fiber-reinforced concrete, combining low average density and high strength, is associated with an increase in the cost of the material, therefore, the existing limitations can be identified: the dependence of economic efficiency on the structural features of a particular building, construction conditions and local resources used for concrete production.