Structural behavior of multifunctional inhomogeneous infra-lightweight concrete elements

Abstract

The reduction of energy and resources consumption in the building sector is of crucial importance. One way to approach this challenge is the development of high-performance materials to increase efficiency. In the research project “MultiLC” (Multifunctional lightweight concrete elements with inhomogeneous properties) highly efficient Infra-Lightweight Concrete (ILC) elements with varying properties over the cross-section and further functions, for example, active thermal insulation or photocatalytic air purification, were developed. Besides investigations in concrete technology and building physics, the structural behavior of inhomogeneous ILC-elements was examined. This paper summarizes the analytical and experimental methods used to investigate the structural behavior of wall and beam specimens and wall-to-slab connections. It was found that the stiffness method is a reasonable approach to calculate the maximum load-bearing capacity of the inhomogeneous ILC elements. Recommendations could be formulated for ultimate design values. Also, the feasibility of a fixed connection between a normal concrete slab and a multi-layered ILC-wall was shown.