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This paper discusses the problem of existing buildings which lack basic design documentation. This situation might have been caused by the old age of buildings or the loss of documentation. To solve this problem, time-consuming and expensive steps have to be taken, such as assessing the strength of construction materials, identifying loads, evaluating the technical state of structures and their strengthening. The authors present cases in which similar problems were solved.

This paper presents practical, engineering algorithm which may be used to analyse fire resistance of the Klein's ceiling after its renovation. This type of ceiling consists of bricks and steel beams for which the fire resistance may be obtained using the standard ISO curve and Eurocodes. The authors of this article show also the example in which the problem with fire resistance of Klein's floor is solved.

The paper presents exemplary applications of aluminium and concrete composite structures. It discusses arguments for using these structures and reasons why in some cases it is advisable to replace a steel beam with an aluminium beam. Additionally, the article aims at analysing aluminium and concrete structures as a part of sustainable development. To this end, an analysis of materials used in aluminium and concrete composite structures was conducted. Moreover, the article presents a new method of joining an aluminium beam and a concrete slab, which may have a practical application.

In the paper the influence of boundary conditions on the thermal response of selected steel members subjected to fire loads is investigated. Simply supported and restrained steel beams subjected to uniformly distributed load and fire accidental action are analysed using the standard ISO-fire curve. The iterative procedure to investigate critical temperature is used. At each increment of temperature the ultimate limit state is checked using the EC recommendation. The special attention is focused on axial action occurring due to thermal elongation. The illustrative examples show that, proper modelling of the beam's boundary conditions plays an important role in describing and understanding the real behavior of elements in fire conditions. Moreover, beam's boundary conditions can change structural response and result in reduction of critical temperature and fire resistance time.

In the paper the analysis of the influence of fire load on class of cross-section of steel structural elements is presented. In the fire situation some cross-sections may have a different class than at room temperature. Special attention is focused on steel structural elements which are Class 3 at room temperature and Class 4 in the fire situation. The examples illustrate a steel element, which obtain different class of cross-section at room temperature and in the fire situation. The reduction of critical temperature and fire resistance time is also taken in to account. The structure under consideration pertains the steel beam, which is a part of the existing building in Poznan. In the paper, the comparison between fire resistance of the beam using simulation of fire in FDS software and procedure according to standard time- temperature ISO curve is presented.