Advanced Materials Research Vol. 1020

Abstract: The paper shows a conclusion and a solution of principal resolving equations of the motion of linear and geometrically non-linear theories of thin depressed shells with median surface breaks. A formula has been obtained for determining the shell’s free bending harmonic oscillation frequency in case of a hinge support on rigid diaphragms. Charts are supplied showing the dependence of free oscillation frequency on the change of different factors. A conclusion has been drawn concerning the analytical method efficiency.

Abstract: In 2013/2014 a team of students at the Technical University of Częstochowa who are working on one of several thematic projects entitled: “Constructing a concrete floating barge” which is carried out under the auspices of the scientific circle “Invenit” at the Faculty of Civil Engineering, Technical University of Częstochowa, have taken up the challenge to build a concrete barge reinforced with basalt bars

Abstract: This paper is a detailed study on the recycled concrete two-way slabs with stud-shear reinforcement, failure mode and failure mechanism are given. Further, by using the ABAQUS nonlinear finite element software to simulate the punching failure of recycled concrete two-way slabs with anchor bolts.Through the reasonable choice of the material property parameters 、the geometric parameters、the boundary conditions to get the reasonable results. In this paper, the conclusion can be used to provide the basis and reference in improving the punching resistance and ductility of the recycled concrete two-way slabs.

Abstract: Subway stations or shield wells are often built using steel reinforced concrete supporting structure materials. These concrete retaining structure materials must be destroyed before launching and receiving of shield, so, some security risks may arise during destroying, and time limit for project may be longer, and the structure strength may be weakened; there are the same problems in crossing the existing subsidiary structure. In the supporting structure, concrete supporting structure materials have been partially substituted by GFRP bars in shield engineering in the world. In order to study the mechanical properties of GFRP bars deeply, experimental research on strength of GFRP bars have been made, and some relation shapes between stress and shear strength have been discussed; all of these are expected to make some basis for the design of GFRP concrete in shield engineering.

Abstract: This paper proposed an empirical relative variation coefficient to improve performance of cellular automata model which was put forward by Zhou^[1] to predict failure patterns of masonry wall panels under lateral load. The improved empirical cellular automata model could take discreteness of failure patterns into account. Then, parameter analysis of the empirical variation coefficient was conducted to find out its reasonable value interval. Consequently, a serial failure patterns could be predicted on the basis of each experimental record. A comparison between predicted failure patterns and experimental results has been made, which proved the empirical cellular model with relative variation coefficient was not only one-to-multiple, but also valid.

Abstract: The paper deals with issues connected to shrinkage of industrial concrete floors and the consequent formation of cracks within the structure, since it handles about an undesirable effect. A huge number of cracks may cause serious defects and faults. The beginnings of the paper do summarise the theoretical background of volumetric changes, discusses their types and explains the possible methodologies for their measurements, the major objective of which is focused on the determination of the amount of cracks. Inside of the experimental part three samples are monitored with respect to shrinkage. The measurements are done with the utilisation of a shrinkage drain and are carried out for a time interval of 12 hours, whereas the structure moves the most under this particular time period. In the last chapters it comes to an evaluation of the results. This includes a comparison of obtained data against normative requirements dealing with shrinkage, and a subsequent a comparison of samples, since the observations are done under the exact same boundary conditions

Abstract: This paper deals with the issue of airborne sound insulation of partition wall in wooden house. Wood and wood-based constructions are very specific in terms of acoustic due to the low surface density of their elements. Built-in installations and side-ways of spread of noise negatively affect damping properties of the wall. This article contains also a proposal of structural measures to ensure better acoustic resistance of the separating elements.

Abstract: An important part of the design anchorage strands is the proper use of anchor plates, which is responsible for transfer point load (pre-stressing force) from the steel element to the masonry. The anchor plates are usually designed from steel plates that provide transmission of the pre-stressing force from rod (ropes) to the masonry by concentric pressure. Therefore, their size is designed so that was not exceeded the design strength of concentric pressure masonry under the anchor plate. The thickness of the anchor plates contributes to reduce its deformation during tensioning to a minimum. The aim of this paper is performance laboratory measurements of deformation of prestressed masonry especially in the anchorage zone with using anchor plates with dimensions of 150 x 150 about thickness 10 and 20 mm. Prestressed element is a brick corner with a height of 870 mm and thickness 440 mm (exposed masonry). Subsequently are intended of suitable size parameters anchor plates so that they can be used regardless of the site of their future action.

Abstract: Problems with horizontal deformation in the subsoil are often solved for building on undermined areas not only in our region. There are many ways to solve this problem. The existing building can be draw together in total or stiffened belt can be carried out around the structure foundation. But the best solution is that which is carried out beforehand. One of the methods which can be applied beforehand is using of sliding joint with using of rheological properties of asphalt. The basic principle of this method lies on application an asphalt belts or another material between foundation and subsoil. It is also created concrete base layer between sliding layer and subsoil to ensure base flatness and to protect of sliding layer material. The type of material is important for correct function of sliding joint and there are very often used the rheological properties of traditional asphalt belts. The laboratory tests are carried out at the Faculty of Civil Engineering VŠB-Technical University of Ostrava to verify their rheological behavior at different loads and different temperatures. Following the test there is the effort to use of obtained values to other calculations and there is effort to contribute to innovation of currently method of design which is based on old materials from the 80th. The principle and the results from the laboratory test as well as current conclusions will be presented in this paper.

Abstract: Wooden constructions are very susceptible to damage caused by improper operating conditions. Depending on the work conditions of construction the consumption manifest itself through: growth of cracks, loose connections, exceeding the allowable diffracts, constant moisture, development of fungus and mold, the occurrence of pests. Determining the type of these defects and their impact on work conditions is the topic of this article. Determination of strength properties of the component consist on establishing the type and kind of wood used in the construction and its class making it is possible to assign standardized permissible stress values and the modulus of elasticity. Determination of the extent to which the original cross-section of the component has been damaged during operation (shallow or deep crack, shrinkage crack, damage of internal structure of the wood by insects and fungus, moisture) allows to determine how much the strength properties of the wood component has been deteriorated. The static-strength analysis aims to determine the actual strength of load capacity of the component and stability of the whole object after taking into account the adverse impact of consumption and damage of the construction and allows determining and selecting suitable variant of renovation, repair or enhance the construction of the object. The article depicted the methods of determining the rate of consumption of the construction and taking into account the effect of cracks, moisture, fungi and insects action on the load capacity of wooden components..