Applied Mechanics and Materials Vol. 769

Abstract: This paper presents the probabilistic safety assessment of nuclear power plant (NPP) in Slovakia due to earthquake event. The experiences from the deterministic and probabilistic seismic analyses of the structure resistance are mentioned. On the base of the geophysical and seismological monitoring of locality the peak ground acceleration was defined for the return period 10⁴ years using the Monte Carlo simulations. The synthetic spectrum compatible accelerograms generated in program COMPACEL are presented in comparison with requirements of ASCE4/98 standard.

Abstract: Ground-supported tanks are used to store a variety of fluids. The liquid develops a hydrodynamic effect on walls and bottom of the tank during earthquake. This paper presents influence of mesh parameter “PATTERN” for numerical model fluid region of liquid seismic response in rectangular tank – endlessly long shipping channel. Finite Element Method (FEM) was used in software Adina.

Abstract: The paper presents the results of calculations, taking into account a material model (isotropic reinforcement according to Misses), representing laboratory tests of additional reinforcement. Complying with PN-EN 1991-1-7:2008 (EC1) and PN-EN 1992-1:2004 (EC2) this reinforcement is applied in reinforced concrete slab-column structures in order to protect them against progressive collapses. Additionally, an analysis was carried out, considering, the effect of applying in the material model the true stress-strain curve. In the course of these experimental investigations the values of displacements caused by the exerted load were compared with the values of numerical calculations.

Abstract: Full–scale dynamic testing of bridge structures can provide valuable information on the service behavior and performance of structures. With the growing interest in the structural condition of highway bridges, dynamic testing can be used as a tool for assessing the integrity of bridges. From the measured dynamic response, induced by instructed passing trucks, modal parameters (natural frequencies, mode shapes and modal damping values) and system parameters (stiffness, mass and damping matrices) are obtained. These identified parameters can then be used to characterize and monitor the service of the bridge structure in the future. Analytical models of the structure can also be validated using these parameters [1,2]. The paper presents a procedure for estimating the traffic load bearing capacity of the steel arch highway viaduct Bridge Structure 205 (DC1–9, 755 m) constructed on Highway D1 in Nord Slovakia (Fig. 1) over the natural hollow basin via dynamic tests of the viaduct structures.

Abstract: This study is focused on the form-finding process of cable-membrane structures using the dynamic relaxation method with kinetic damping. Eight different schemas of the dynamic relaxation method are compared in the paper. The effect of mass distribution along the structure is also of interest. The efficiency and stability of each process are compared on selected 3D examples of cable-membrane structures.

Abstract: This paper presents the results of laboratory tests concerning the central connection of the slab with the column, in which an additional reinforcement ensuring the structure against a progressive collapse was applied as to recommended in the standard PN-EN 1991-1-7:2008 as well as in PN-EN 1992-1-1:2008. Regulations concerning the necessity of such a reinforcement are also contained in the American and Australian standard as well as in the Bulletin FIB. The obtained results of investigations have been compared with calculations based on a spatial numerical model representing the analyzed phenomenon. The numerical model bases on predefined material models of steel and concrete, taking into account non-linear dependences of the strength of these materials. The values of displacements of the upper surface of the slab depending on the exerted load were compared with the values of numerical calculations.

Abstract: In this paper authors present analysis of limits when formulas for limiting the span/depth ratio, given in EN1992-1-1 section 7.4.2, for different reinforced concrete members subjected to bending, are applicable. Recommendations about how to take the compression reinforcement in calculations into account, when deflection of bending members should be assessed, are also proposed.

Abstract: The paper is focused on the evaluation of chloride ingress considering high performance and ordinary concrete mixtures. The effect of concrete maturing is investigated as well. The selected laboratory measurements are used for the description of resistance of concrete against ingress of chlorides. The Finite Element-based numerical model is applied in order to evaluate the effect of concrete type as well as the effect of aging.

Abstract: The paper is focused on the measurement of creep and shrinkage and on the describing of measuring data reconstruction. The cement mortar was prepared from Portland cement and sand in relation 1:1. The cement mortar was tested in water saturated and dried conditions [1]. The tested specimens were four months old. The raw data were damaged by power outages. Evaluation of creep measurements of the reconstructed data was carried out and is presented.

Abstract: Composite slabs with prepressed embossments present an effective solution for horizontal structures. Prepressed embossments ensure composite action after hardening of concrete. Longitudinal shear failure mode typically governs if the shear resistance of embossments is not sufficient for full composite action. Mutual separation of thin-walled sheeting from concrete and its deformation inside the rib is characteristic for this failure mode. Design methods for composite slabs use full scale bending tests in several series to determine their bearing capacity. A less expensive alternative is to use small-scale shear tests to determine shear characteristics of the sheeting. This paper presents detailed numerical models of slab in shear and models of slab in bending with and without embossments. These models are compared with previously performed experiments. Key WordsComposite slab; steel sheeting; concrete; prepressed embossment; longitudinal shear; experiment; numerical model