Employment of wood blocks in concrete-filled tubes

The application of wood with different shapes and volumes in concrete filled steel tubes is focused as the main idea of this innovation. This idea helps decrease the weight of the composite element relative to the fully concrete filled tubes and yet employ the compressive strength of the wood itself. The wood is covered by the concrete and the concrete is in turn covered by steel tubes so that the new composite element is believed to bring about a considerable capacity increase, especially when it is exposed to the compression. Keywords: Wood infill, Concrete; Steel tubes; Fig.2. Geometric features and details of different cross-sections.