https://etalpykla.vilniustech.lt/handle/123456789/156172 Sat, 04 Apr 2026 18:41:41 GMT 2026-04-04T18:41:41Z https://etalpykla.vilniustech.lt/handle/123456789/157713 Assessment of concrete bridge performance under moderate seismic shock using concrete damage plasticity model Dulinska, Joanna M.; Szczerba, Radoslaw In the paper the assessment of seismic performance of the reinforced concrete bridge to the moderate earthquake is presented. To represent the inelastic behaviour of the concrete material under dynamic loading the concrete damage plasticity model was assumed. The seismic input data were registered during the most recent natural seismic shock that occurred in Poland on 6th January 2012. A model of non-uniform kinematic excitation, typical for multiple-support structures, was introduced. The analysis proved that the first natural frequency of the bridge lied in the range of dominant frequencies of the shock that caused the amplification of the dynamic response. It turned out that the tensile damage (cracking) in some parts of the bridge appeared and the stiffness of the concrete material was degraded even under moderate seismic event. Hence, the seismic resilience of the bridge decreased after the shock. This is especially important not only in case of earthquake but in case of mining tremors as well. Considering their high repeatability the concrete material might be gradually degraded. Tue, 01 Jan 2013 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/157713 2013-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/157712 Strength calculation method for cross-section of reinforced concrete flexural member using curvilinear concrete stress diagram of EN-2 Židonis, Ipolitas This article is continuation of earlier work of the author. A practical method for cross-section strength calculation of flexural reinforced concrete members with rectangular compression zone using curvilinear concrete stress-strain diagrams of Eurocode 2 (EN-2) is presented in this article. The method can be used for strength calculation of members with flanges and reinforcement in compression zone as well. Curvilinear EN-2 stress diagrams are readily superseded by polynomials that can be easily integrated are proposed by the author. It gives opportunity for mathematically accurate, without changing of curvilinear diagram by arbitrary diagrams, determination of value and location for resultant of concrete compression zone stresses and location of neutral axes as well. Calculation is performed for any chosen strain of the layer subjected to the maximum compression. The said strain may be of greater or less value in comparison to that corresponding to the concrete strength. In this way the maximum strength of the member can be estimated when the compression zone strain value varies within chosen interval. The method is suitable in both cases for the members which are commonly (not abundantly) and abundantly reinforced if the neutral axes is located within the cross-section, i. e. within the interval up to the centre of the tensile reinforcement cross-sectional area. Strength of members reinforced with high strength reinforcement which is not sufficiently prestressed or not prestressed at all can be determined by calculation. Formulae can be used for calculation of stress-strain state in persistent situations (not ultimate ones) and for calculation of steel prestress value as well. Rectangular compression zone parameters required for member strength calculation using curvilinear stress diagram are presented in the article. Results obtained by the proposed method are compared with the results obtained using EN-2 formulae. Tue, 01 Jan 2013 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/157712 2013-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/157711 Energy transfer measuring in dynamic probing test in layered geological strata Žaržojus, Gintaras; Kelevišius, Kęstutis; Amšiejus, Jonas Static and dynamic probes are commonly used performing engineering geological investigations in Lithuania. Due to their peculiarities, static cone penetration tests (CPTu) are most suitable for penetration of relatively weak soils. In case of deeper soil layers covered with strong soils was investigated Dynamic penetration test (DPT) is the only that could be used. In Lithuania, the most common bearing strata of foundation are glacigenic and alluvial deposits of Pleistocene age. Geotechnical properties of separate strata may differ significantly. Despite the fact, that the dynamic probing is a relatively cheap comparing with CPT investigation method, it has some significant disadvantages. The main disadvantage of reliability of DPT test results is related with transfer of driving energy through the drive rods to the cone tip. Three tests with attached sensors to the rod were performed in layered geological strata to obtain energy transfer parameters. CPT test was done after DPT for obtaining soil stratification and geotechnical soil properties promiscuity at a distance of 1.5 m. The field tests were performed at a site that is located in northeast part of Vilnius, near the complex of buildings of Vilnius Gediminas Technical University in Saulėtekis district. From geological point of view this part of Vilnius is stratified of glacigenic deposits. Tue, 01 Jan 2013 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/157711 2013-01-01T00:00:00Z https://etalpykla.vilniustech.lt/handle/123456789/157710 Sustainable development of rural areas’ building structures based on local climate Hashemkhani-Zolfani, Sarfaraz; Zavadskas, Edmundas Kazimieras Sustainable development is a new concept with various perspectives in communities. Cities and rural areas are in the core of attention for developing. This study focuses on rural areas. Stability of building structures is so important in villages and rural areas. One sustainable development criterion of villagers is suitable housing. In this research, both new and traditional technologies are investigated for developing rural areas. The most part of Iran is in desert areas. This research investigates these areas in Iran as a case study. Two MCDM methods is applied as a new hybrid model in this research, at first SWARA is applied for weighting criteria and then COPRAS is applied for evaluating five selected building structures in term of these regions climate. Authors propose that this research can be useful as a framework for using in other regions in all around the world. Tue, 01 Jan 2013 00:00:00 GMT https://etalpykla.vilniustech.lt/handle/123456789/157710 2013-01-01T00:00:00Z