Fig 7 - uploaded by Aleksander Kozlowski
Content may be subject to copyright.
Horizontal displacement of analysed chimney.

Horizontal displacement of analysed chimney.

Source publication
Conference Paper
Full-text available
Flange bolted joints are the most popular type of connections of steel elements with large diameter circular hollow cross section. Essential feature of such connections is axisymmetric arrangement of the bolts in flange plate. Flange joints are used very often in structures such as chimneys, supports of elevated tanks, wind power plants, etc. The d...

Context in source publication

Context 1
... of analysis -the horizontal displacements of top of the chimneys are shown in Fig. 7. It can be observed, that this displacement increases if the number of joints increases and if the stiffness of joints decreases. In case of using non-preloaded flange bolted joints in structural shell, the horizontal displacement of chimney calculated taking into consideration the number and stiffness of joints is about 40% more then ...

Similar publications

Article
Full-text available
We examined the growth and yield of winter wheat (Triticum aestivum) in response to the predicted elevated CO2concentration and temperature to determine the mechanism of the combined impacts in North China Plain. An elevated treatment (CO2: 600 μmol mol-1, temperature: +2.5~3.0 °C, ECTI) and a control treatment (ambient CO2and temperature, CK) were...
Article
Full-text available
This cross-sectional descriptive study captured the perspectives of 14 college-bound students with ASD at the critical period of transition from high school using an open-ended prompt. The aim was to capture (1) student definitions of success as a college student, (2) the factors they identify as most influential leading to becoming a college stude...
Article
Full-text available
Urban spatial structure evolution, when using employment as the proxy, can be explained by the change of employment distribution. In this study, we measure the 361 US metro areas (metros) by employment shares, in five submetro sections (i.e., main-center, sub-centers, non-center clusters, non-cluster urban areas, and rural areas), and explore the s...
Article
Full-text available
Background The first 2 years of life is a critical period of rapid growth and brain development. During this period, nutrition and environmental factors play important roles in growth and cognitive development of a child. This report describes the study protocol of early nutrition, growth and cognitive development of infants from birth to 2 years o...
Article
Full-text available
In coastal areas, wave-induced current often has very important role in the process of sediment transport. The previous studies have shown that when waves reach into coastal areas, due to the shallow water and the heterogeneity of bottom topography, wave are breaking and unevenly distributed. Due to this uneven distribution has created different yi...

Citations

... • The contact forces f c exerted on the lower face of the flange in the compression area, This assumption has been considered by Stamatopoulos [12] and Kozlowski et al [13] either for the evaluation of the bending resistance or the initial rotational stiffness. In presence of thin flange, the prying force always exist and tend to decrease the bending moment at the junction with the tube-wall created by the bolt forces. ...
... for a dominant compressive force ( Wojnar [13] proposed a formulation based on a parametric study for three types of welds. A theoretical solution is proposed here for full penetration butt welds of ring and blank flanges (see Figure 28). ...
Article
The available design rules to evaluate the force distributions in the tension and the compression parts of bolted circular flange connections under bending moment and axial are often based on the beam theory which is not adequate. The aim of this paper is to propose an analytical model for the calculation of the static resistance of bolted circular flange connections subjected to a combined bending moment and an axial force considering the influence of the joint ductility. An analytical model is also proposed to evaluate the stiffness of the tensile and the compressive parts of the connection and thus its initial rotational stiffness. The results obtained via the proposed analytial model are compared favourably against experimental tests and numerical simulations.
... • Models based on elastic analysis ([2]- [4]) where the ultimate state corresponds to attaining the resistance of just one component of the connection (tensile or compressive). This criterion doesn't always reflect the real resistance of the connection as other components may possibly reach their plastic resistance. ...
Conference Paper
Bolted circular flange connections are used for tubular members in buildings as well as in structures such as chimneys and pylons for lighting, communication, wind turbines and ski-lift installations. For most of the latter connections, the resistance to bending moment, although usually associated with an axial force, is generally the static design criterion at the ultimate limit state. While design methods are readily available for such connections subjected to a tensile axial force, it is not so for those subjected to bending moments. In this paper, a model is proposed for the determination of the resistance of bolted circular flange connections subjected to a bending moment combined with an axial tensile or compressive force. This model is based on limit analysis and considers two general failure modes based on the ductility of the tensile parts and the buckling resistance of the compressive part of the connection. A “ductile mode” of failure is defined as when the resistance of all the parts in tension can be fully reached, which is possible only if they are sufficiently ductile and if compressive failure is avoided. In the case of a “non ductile mode” of failure, the full resistance of the compressive part and/or that of only some of the parts in tension is reached. A parametric study was performed based on a 3D finite element model considering elasto-plastic material behaviour and using contact elements. The results obtained from the proposed analytical model are in good agreement with available experimental results and those obtained from the finite element model.
... Results of analysis can be seen infigure 4. Horizontal line shows value of natural period obtained by simplified formulas from [1]. Detailed results of more complex analysis can be found in [5]. The following conclusions can be drawn: -in case of preloaded joints, change in natural period is small and can be neglected in the design, -for guyed chimneys with non-preloaded joints, stiffness of the assembly connection do not influence on natural period, -for cantilevered and supported at intermediate level chimneys with non-preloaded bolts in connections, change in natural period can reach even 30 %.Figure 4 : Natural period of steel chimneys: 1 -cantilevered chimneys, non-preloaded joints, 2 cantilevered chimneys, preloaded joints, 3 – chimneys supported at intermediate level, non-preloaded joints, 4 – chimneys supported at intermediate level, preloaded joints, 5 – guyed chimneys, non-preloaded joints, 6 – guyed chimneys, preloaded joints. ...
Conference Paper
Full-text available
Using the mechanical model of flange bolted joints, parametric study has been conducted to investigate influence of joint stiffness on the behaviour of such structures as steel chimneys. Particularly, it was investigated the influence of the stiffness of flange bolted joints on the natural period of cantilevered steel chimneys. Based on results of the investigation, the following conclusions were stated: natural period of steel chimney T1 increases if the number of joints increases and if the stiffness of joint decreases; when non-preloaded joints are used, the change of natural period is up to 30% for steel cantilevered chimneys. When preloaded joints are used, the change of natural period is small and can be neglected.