Applied Mechanics and Materials Vol. 835

Abstract: This paper presents a three-dimensional numerical study to evaluate the variations in stresses in the soil mass surrounding a carbon steel pipe class API 5L X60 submitted to uplift due to ground elevation. Analyses were carried out for soil relative density, pipe stiffness and surficial surcharge loading. Results have shown that stress variations due to uplift are lower for looser backfill soils and flexible pipes. Stress variations in pipe invert are meaningful in the vicinity of the region between stable and unstable soil masses.

Abstract: Ventilated façades help to ventilate the humidity out of buildings constructions and also help to protect interiors against overheating during the summer seasons. The efficiency of the ventilated façade construction depends on a design of the ventilated cavity and a cladding type. The air flowing around the façade construction may influence the air velocity in the ventilated cavity. This study presents the experimental assessment of the wind influence on the cavity air velocity in the different designed ventilated cavities. The experimental assessment is based on two sections of ventilated façade constructions with different type of the ventilated cavity design. Both sections are fitted by small size claddings with open joints between the adjacent cladding parts. The cavity temperature and airflow differences are assessed during the one week period for the experimental setting. Results show that the effect of wind is significantly different for open joint ventilated cavities that are differently designed.

Abstract: This paper reports test results of flat slab cast from micro-concrete and normal concrete subjected to concentric punching shear. Although the punching shear failure mechanism of micro-concrete slabs was very similar to that of normal-concrete slabs, the punching shear capacity is reduced to about 73% due to the reduction in transferred shear stresses across shear cracks by aggregate interlock. Therefore, a shear retention factor of 0.7 is suggested to be applied in estimating the punching shear strength of micro-concrete slabs.

Abstract: The purpose of this study is to evaluate and compare the effectiveness of friction dampers and tuned mass dampers (TMD) using numerical simulations. Wind and earthquake loads are simulated on a 15-story model building structure in which a friction damper and/or a TMD are installed. The idealized one-dimensional structure with a friction damper at each story and/or a TMD at the top of the building is subjected to a simulated load, and the displacement and acceleration responses of the structure are measured. The outcomes show that a TMD is more useful to control the vibration of the building from a wind load and a friction damper is more suitable for loads created by large accelerations such as those found during seismic events. This study provides verification on the performance of friction dampers and TMDs according to each of the two load types, wind and earthquake, through numerical simulations.

Abstract: The framed shear wall structure is a high-rise building structure with a transfer story, which has the poor seismic performance (upper rigid and lower flexible). The frame layer in the earthquake is prone to fail, which may even cause the collapse of building. In this paper, it uses the finite element software SATWE to explore the seismic performance of framed shear wall structure. Then we can draw the following conclusions: When the transfer story is set from the third layer to the ninth layer, the earthquake action of transfer story varies from 437.2kN into 564.9kN and is significantly higher than that of upper and lower layers; All the period of free vibration, angles of drift, bottom shear force, overturning moment of the structure have adverse effects on the structure, which are also detrimental to the structural seismic.

Abstract: Fire resistance of building structures is important not only in terms of prevention of hazards to human health, but also from the economic point of view. The choice of method of fire protection of steel structures depends on the responsible choice of finish or cladding material and suitable technology implementation. Although the assessment of fire risk is a priority, when selecting the decisive criteria we must not also forget the cost of fire protection measures. This article aims at economic comparison of the two fire protection measures for the steel column of rolled profiles.

Abstract: The paper deals with thermal technical failures of building structures that arise due to bad solution of construction details. For the purpose of this paper several construction details were selected. These construction details show a fault. The details were thermal technical evaluated by using a numerical computational model. In addition to the thermal technical assessment of these construction details it was also suggested possible solution to problems that arise in these places of building structures.

Abstract: Stamp tests results of the two-layer basis from the crushed stone and sand reinforced by geogrid with steel fibers in a plastic shell are given in report. Deformation characteristics of the reinforced design are received. Experimentally established deflections of the reinforced basis are compared with the results received theoretically. Thus the reinforced layer of crushed stone is considered as a multilayered plate on the elastic basis. Bubnov-Galerkin's method of calculation is used. Satisfactory coincidence of theoretical and experimental results is received. The effect of reinforcement on deflections is established.

Abstract: In article the calculation model of the reinforced crushed-stone-sand basis of pavement with the variable module of elasticity changing on layer depth on exponential dependence is offered. The calculation model is based on representation of the reinforced layer of granular material as the multilayered plate consisting of any quantity of the continuous layers which are rigidly connect among themselves. The method of calculation of the reinforced bases of pavement leaning on experimental data is offered. A concrete example of calculation is reviewed.

Abstract: Modular building is without question a world trend not unknown for the global building. Nowadays the future of architecture is discussed from the viewpoint of modular building. Modular building may have an exclusive role when dealing with current condition of architecture ant its future development. The article deals with the modular construction of the historical development and current trends. Construction speed, efficiency, quality materials. These are the common denominators of modular construction. However, it should be avoided technocratic construction without soul and try to instilling to modular construction aesthetic and quality parameters for building the modular architecture.