The ecological sustainability of inner-city timber construction projects has become increasingly important in recent years. Timber is a combustible building material with a low thermal conductivity. Its behaviour during combustion is predictable and quantifiable. Due to its flammable nature and historical fire problems, timber has been problematic in multi-storey building construction. It consequently has different building regulations than most materials used in standard construction methods. This thesis investigates different possibilities of solving fire protection problems in wooden buildings. Special considerations are given to ceilings in multi-storey timber buildings of building class 5 and higher. To achieve a sufficient safety level, compensatory measures are prescribed for these buildings in building guidelines. A distinction is made between extinguishing systems and structural compensatory measures through encapsulation. The chosen safety measures are up to the planners and are judged on a project-by-project basis by weighing their respective advantages and disadvantages. In order to meet the high requirements in the construction industry and enable resource-efficient structures, the use of composite structures is increasing. Composite materials enable the utilization of multiple different material properties. As part of a "Sparkling Science" project of the Vienna University of Technology, a wood-steel-concrete ribbed ceiling was tested. The results of various tests on composite structures have demonstrated positive outcomes. During a comprehensive analysis of the ribbed ceiling, two fire tests were carried out on a hybrid cross-section adapted to the test oven. They have been exposed to a uniform temperature curve for 90 minutes, and the temperatures of the individual materials were measured. From the temperature measurements obtained during testing it was possible to draw conclusions about the burning behaviour of the wooden beams and the associated protection given by the steel. Furthermore, the temperature development and the flaking behaviour of the reinforced concrete were investigated. A static model was developed based on the test results and used to calculate the load capacity on a ribbed deck with a span of 6 m, where the resultant stress curves were examined and evaluated. The aim of demonstrating the load-bearing capacity over 90 minutes fire duration could be achieved, which would make the use of the ceiling element in conventional building construction possible. To prove this, further fire tests must be carried out, in which not only the load-bearing capacity but also the thermal insulation and the room closure are examined.