Precast reinforced concrete demountable column system with elastically mounted diaphragms inserted into frame sections developed within the TACR grant project [1] was verified by a pseudo-dynamic tests in the UTAM AV CR experimental facility. The experimental verification and theoretical analysis was aimed at identifying the stiffness characteristics and dynamic response of the “frame” section, including the evaluation of the effect of demountable joints while mounting the diaphragm on beams using elastic (rubber) bearings. The experimental verification was performed for three different diaphragm to beam connections made by a rigid screw connection and by a connection with elastic bearings with two different stiffness values. During the first phase of the experimental verification the structure was exposed to pseudo-dynamic loading by a hydraulic jack controlled by deformation or by amplitude and corresponding frequency of the jack. The absolute deformations of the structure as well as relative deformations between individual structural elements were monitored by means of linear deformation sensors. The force necessary for reaching these deformations was also monitored. In the second phase of the experimental campaign the natural frequencies and dampening characteristics were identified. Based on the obtained values, the stiffness and dynamic characteristics of the frame structure with three different types of the stiffening diaphragm connections were identified and were compared with numerical model. Theoretical analysis and results of experimental research proved the satisfactory resistance of the proposed multi storey building system.

The paper deals with the response analysis of interaction of a gaseous shock wave and a glass plate structure with particular reference to the character of excitation wave and material characteristics of structure. The goal of this analysis is the determination of a hypothesis of failure of window glass plate on the basis of the actual plate rotation during extreme plate displacement. Pressures greater than the ultimate stress or plate rotation bring to the collapse of the glass plate structure. The assumptions and results of theoretical - numerical solution are compared with experiments in situ and in laboratory conditions.

The paper follows from the theory of explosion and interaction of an impact wave formed by the explosion and a structure.Firstly, the paper determines the parameters of the blast wave excited by a small charge explosion.The empirical formulas on the basis of our own experimental results are shown and used for the structure analysis.Evaluations of structures loaded by an explosion based on dynamic response in rotations round the central line of plate or beam systems during the dynamic load of this type is discussed in the paper and comparison of own limit values and published ones is presented.Blast loads typically produce very high strain rates  in the range of 10 -2 to 10 -4 s -1 .The effect of strain rate for concrete material is discussed.The formulas for increased compressive strength of concrete and steel reinforcement are presented.The ductility of structural members is influenced by the corresponding values under high strain rate of reinforcement.Damage to the structure is assessed accordingly firstly by the angle of rotation of the middle axis/surface, and secondly by the limit internal forces of the selected structure.The extreme nature of blast resistance makes it necessary to accept that structural members have some degree of inelastic response in most cases.This enables the application of structure dissipation using the ductility factor and increased of concrete strength.The limits are correlated with qualitative damage expectations.The methodology of dynamic response assessment and its application to the simple bridge structure is discussed.

The study of dynamic behaviour of vaults of historic buildings reveals new knowledge which can be used for the local analysis and stabilisation and rehabilitation designs of damaged vaulted structures. The analysis of the results of dynamic loading brings objective background material for the identification and localisation of failures according to MAC or COMAC criteria [1, 2] and the assessment of serviceability and structural reliability of vaulted structures of historic buildings .

The paper deals with the structure, loaded by explosion of outdoor charge. Evaluations of structures loaded by an explosion based on dynamic displacement and rotation round the central line of plate, wall or beam systems during the action of a dynamic load of this type have been of very topical interest in recent times, as regards the process of evaluating the effects of an explosion on a structure. For structure response calculation the empirical formulas of the explosion load parameters were used. These formulas were derived by the authors for small charges. As an example the paper is based on the variant theoretical dynamic response analysis of a rectangular masonry partition and its comparison with the results of experimental verification of the bearing capacity of the structure.

The spatial stability and controlled dynamic characteristics of an articulated precast column system are secured by thin-walled reinforced concrete diaphragms elastically embedded in some bays by means of special damping bearings. The intensity and the range of the load-bearing system’s response to dynamic (e.g. seismic) effects and vibrations are achieved by the stiffness adjustment of damping bearings. The stiffness of damping bearings may also be adjusted during exploitation. The designed structure with an elastically embedded diaphragm has been exposed to dynamic testing whose results are presented in the article. Another significant characteristic of the precast structure is its dry assembly and potential disassembly and relocation to another site. The experimental and theoretic analyses performed have confirmed the assumptions for the system’s application in areas with the occurrence of natural seismicity.

The stabilization and reinforcement of damaged barrel vaults with lunettes over an arcaded walk, applying composite strips based on high-strength carbon fibers and epoxy resin, was performed during the restoration of a historic monastery. The application of reinforcing composite strips in the soffit of damaged barrel vaults was preceded by relatively extensive experimental research and theoretical analyses. This method significantly reduces the interventions into and the degradation of the original historic structure (surface application) and is reversible.

Research within the TACR TA02010837 project “A Multi-Purpose Demountable Prefabricated Reinforced Concrete Building System with Controlled Properties of Joints and Potential Repetitive Use” included the design of a prefabricated column system with articulated joints of columns and cross bars and diaphragms elastically embedded in some spans; this system allows the modification of static and dynamic characteristics – stiffness and the load-bearing system’s response to external static and dynamic loading effects and impacts. The article presents partial results of a theoretical and experimental analysis of the behaviour of a frame span with a diaphragm discretely connected by means of rubber bearings and cross bars.

During the foundation of constructions above the metro tunnels it is necessary to solve the transmission of vibrations from train carriage sets into their structure. The appropriate protection is by placing the whole structure on spring blocks, which will reduce the transmission of vibrations into the construction to an acceptable level. With the example of a steel frame structure with reinforced concrete floor slabs placed on concrete strips along the metro tunnels, there is solved the response of the structure to the vibration load - variably for aspring nonisolated construction and for a spring isolated construction with a help of spring elements Gerb. On the basis of a comparison of measured vibrations from the metro with the prognosis of the vibration of a spring nonisolated and spring mounted structure in the article there is then discussed the effectiveness of this spring isolated.

The paper determines the parameters of the explosion wave excited by a terrorist charge and assumption of the building structure of a railway station based on dynamic analysis. Certain simplified methods according to various publications, according to our own experimental results and according to 3D computations based on detailed calculation modelling of the interior of the room are compared to determine the explosive effects. Equivalent static analysis was applied to the dynamic response of the structural elements of the selected room. The damage caused to these structural elements is weighted on the basis of the angle of failure of the central axis / surface, and on the basis of the limit stress state of these structures.

The subject of the solution consists in the design and evaluation of vibro-isolation of the multifunctional reinforced concrete frame structure of a building over the tunnel metro structure, based on analysing its 3D calculation model. Measured vibrations in accelerations from passing metro trains were used as non-periodic excitation of the object on the level of its foundation slab. Results of the dynamic calculation are used to document the nature of the building structure response, and of the reduction/amplification of the vibrations at selected points of individual storeys during the pass of metro trains, including the frequency characteristics of the response. The comparison of the building response without and with vibro-isolation is used to demonstrate the efficiency of using a rubber layer in the footing bottom for reducing the transfer of vibrations from the metro to the building. Measurement of the vibrations when the construction had been finished allowed to compare the vibration prognosis to vibrations actually measured in the finished structure.

Vibrations caused by road or railway vehicles running on surface or underground roads or tracks spread through the subsoil into surrounding building structures. These vibrations usually pose no treat to the safety of the structures, but they may limit the use of devices sensitive to vibrations in the buildings. An elastic foundation for the whole structure on a compliant rubber layer inserted in the foundation structure is a solution that restricts the transfer of vibrations into the buildings. An example of the reinforced concrete structure of a building is used here to illustrate the efficiency of using a rubber layer in the footing bottom in order to reduce the propagation of vibrations into the building below the level observed in an unsprung building structure when it is loaded by vibrations induced by traffic.