Abstract
This document intends to provide guidance on the available research in the open literature related to steel timber composite structural elements. The document starts with an overview of the wood classification and strength classes of sawn timber as well as their mechanical properties and behaviour. In addition, a description of some engineered timber products is included together with relevant properties. A comprehensive state of art is provided furthermore in order to identify the main lacks and is divided into 9 distinct items: timber material and products; shear connections; beam-column joints; beams and slabs; columns, walls diaphragms and bracings; fire design and sustainability. The last chapter contains the main conclusions of the extensive state-of-the-art and provides guidance for future research topics.diaphragms and bracings; fire design and sustainability. The last chapter contains the main conclusions of the extensive state-of-the-art and provides guidance for future research topics. The content of this document is expected to be a high value to future research topics when dealing with steel timber composite and hybrid actions. The information present in the Items will be a basis for the future design guidelines and background document for the next generation of design guide for steel timber composite and hybrid structural elements. This document has been prepared within the framework of activities of TC11/WG6.Interim Report of ECCS TC11/WG6: Steel-Timber Hybrid Structures