A seismic assessment of a typical unreinforced masonry residential building without tie beams is presented in the paper. The numerical analysis was conducted according to the finite-element method using experimental data on the quality of the masonry constitutive elements and reinforced concrete. The computation was made using the nonlinear static pushover analysis and nonlinear dynamic time history analysis. The crack development pattern was compared for the procedures, as well as parts of the hysteresis curves.

The paper discussed the behaviour of a typical multi-storey masonry residential building in Sarajevo as part of the massive construction during the 50's and 60's in the Western Balkans. It is noted that these kinds of buildings have been designed without utilizing any seismic codes. Structural walls are located mainly in one direction. As, such buildings represent a large portion of residential unreinforced masonry building stock in a wider region, which most probably do not satisfy the latest code provisions, this leads to the necessity for investigation of their seismic vulnerability. Global numerical models of the building taking into account nonlinear material characteristics have been created. Time History Analysis was done in Finite Element Method (FEM) program, while Pushover Analysis was done in Equivalent Frame Model (EFM) as well. Several comparisons were done and results were found to be in a very good correlation. The paper's aim was to assess the seismic safety of this type of structure. As the building showed inadequate behaviour in X-direction strengthening proposals have been made.

In this paper some experimental and numerical results pertaining to unreinforced masonry walls and its components are presented. This is the first phase of the joint project to be implemented by the Faculty of Civil Engineering, University of Sarajevo and the Institute for Lightweight Structures and Conceptual Design, University of Stuttgart. Testing methods for solid clay brick, lime-cement mortar, wallet compressive and shear strength and elastic modulus follow national standards and European norms. Full scale tests of the unreinforced masonry walls were conducted at the Institute for Materials and Structures, Faculty of Civil Engineering in Sarajevo. Numerical modelling concerns prism compression test and full scale masonry wall exposed to vertical and horizontal forces. Snap-back instabilities due to brick-mortar mechanical and geometrical mismatch are tackled as well. In the second phase it is planned to apply several strengthening methods and to compare the wall behaviour with the unreinforced one. The main goal of the research project is to investigate the influence of the different strengthening methods on the structural behaviour of originally unconfined masonry walls under cyclic horizontal loading.

Seismic vulnerability has been conducted by performing pushover and time history analyses. A comparison in terms of dynamic properties, crack pattern and capacity curves was done and a good agreement has been found between the two software packages. The paper's aim was to assess the seismic safety of this type of construction. A further objective was to investigate if simple software packages could be used for the assessment of these buildings. As a wide stock of this type of buildings is located through the former territory of ex-Yugoslavia, this work would enable a better understanding of this type of structures and quick overview of their actual seismic behavior.

The paper discusses the behavior of a typical masonry building in Bosnia and Herzegovina built in the 50’s without any seismic guidelines. A global numerical model of the building has been built and masonry material has been simulated as nonlinear. Additionally, calculations done with a "less" sophisticated model are in a good correlation with the finite element method (FEM) calculations. It was able to "grasp" the damage pattern; not as detailed as in the FEM calculations, but still quite good. On the basis of this it may be concluded that in this case calculation with Frame by Macro Elements (FME) program could be recommended for future analysis of this type of structures, having quite good results with a less computation time. However, in the need for more precise results FEM should be utilized. Key-words —: masonry, nonlinear analysis, B&H residential masonry buildings, pushover, finite element method, equivalent frame method Pushover Analysis and Failure Pattern of a Typical Masonry Residential Building in Bosnia and Herzegovina

There are a number of old buildings constructed of plain masonry with timber floors located in Sarajevo and elsewhere in Bosnia and Herzegovina. The building where the Embassy of the Republic of Turkey to Bosnia and Herzegovina is currently located is one of them. Due to its historic value, this building has been added to a list of sites that are under the protection of the Cultural and Historic Heritage of the City of Sarajevo. After the 31 March 2009 earthquake cracks were noticed on the load-bearing structure. Damages were assessed utilizing the damage index and vulnerability classification, as well as by defining the level of individual walls. Damages that occurred to the structure are identified; causes for the damage and recommendations for rehabilitation are given in this paper.

This paper discusses the application of approximate methods for determination of the first oscillation period for cantilever and frame structures, frequently used in civil engineering construction works. Based on oscillation analysis of different cantilever and frame structure examples, the paper suggests oscillation forms that can be used for approximate determination of the first oscillation period. The significance of the determination of the basic form and the first oscillation period using approximate methods is in the possibility of estimation of horizontal dynamic loads in preliminary structure system analysis. Computerized processing of dynamic characteristics of complex structural systems requires a number of data registrated, therefore occurrence of errors is highly possible during such a registration. In addition, approximate methods can also be founded useful in confirmation of the first oscillation period calculation results for civil engineering structures.