scholarly journals Torsional Stability Assessment of Columns Using Photometry and FEM

Buildings ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 162
Author(s):  
Krzysztof Wierzbicki ◽  
Piotr Szewczyk ◽  
Wiesław Paczkowski ◽  
Tomasz Wróblewski ◽  
Szymon Skibicki
Keyword(s):  
Bearing Capacity ◽  
Laser Scanning ◽  
Structural Changes ◽  
Industrial Structure ◽  
Critical Force ◽  
Collapse Mechanism ◽  
Plant Structure ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Soil Subsidence

This paper presents a numerical analysis of the load-carrying capacity of steel open-section columns of a coal power plant structure. The structure was subjected to soil subsidence, which led to considerable structural deformations and damages. As a result, additional stresses appeared in the structure, and the static scheme of the structure was changed. To assess the influence of structural changes on the safety of the structure, a detailed investigation was necessary. Laser scanning was used to collect information concerning the geometry of structural elements. Results of the scanning were implemented in a numerical model of the structure. A complex finite element method (FEM) shell model of the column in ABAQUS software was developed. Torsional buckling stability analysis of column members was carried out. Different boundary conditions depending on the type of column connections to other elements were considered. Torsional deformations were treated as imperfections. Analysis showed that the connections of bracing elements, e.g., beams in multilevel frame, directly affected the collapse mechanism and load-bearing capacity of the investigated element. Finally, the paper showed that an appropriate change in the connections between the analyzed column and multilevel frame beams prevents the column from twisting, thereby increasing the critical force and load-bearing capacity of the analyzed industrial structure.

scholarly journals Investigation of the Effect of Dimensional Characteristics of Stone Column on Load-Bearing Capacity and Consolidation Time

2018 ◽  
Vol 4 (6) ◽  
pp. 1437 ◽  
Author(s):  
Mohammad Reza Mohtasham ◽  
Mahdi Khodaparast
Keyword(s):  
Bearing Capacity ◽  
Clayey Soil ◽  
Stone Columns ◽  
Stone Column ◽  
Rigid Foundation ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Soil Subsidence ◽  
Behavioural Model ◽  
Consolidation Time

One of the best methods for rehabilitating loos and soft soils is the application of stone columns. This method enhances the soil properties by increasing its load-bearing capacity, decreasing the soil subsidence, and accelerating the consolidation rate. In the present paper, numerical analysis of a stone column of 10 m in length into a clayey soil using ABAQUS software is presented. The stone column was modelled based on the concept of unit cell, i.e. a single stone column with the surrounding soil. In this respect, material of the stone column was modelled using the elastoplastic behavioural model of Mohr-Coulomb, while Cam Clay behavioural model was used for the surrounding clayey soil. Furthermore, throughout the analyses performed in this study, effects of different parameters (e.g. applied load on rigid foundation, and the stone column length and diameter) on the subsidence and consolidation time of the rigid foundation were examined. The results indicated that, construction of a stone column into clayey soil decreases the subsidence and consolidation time of the soil considerably. In additions, increases in length and diameter of the stone column were found to significantly contribute to reduced subsidence and consolidation time of soil.

Static-Strain-Induced Adaptation of Fibrous Tissue

2009 ◽  
Author(s):  
Jasper Foolen ◽  
Corrinus C. van Donkelaar ◽  
Sarita Soekhradj-Soechit ◽  
Rik Huiskes ◽  
Keita Ito
Keyword(s):  
Mechanical Properties ◽  
Bearing Capacity ◽  
Structural Changes ◽  
Fibrous Tissue ◽  
Load Bearing Capacity ◽  
Mechanical Environment ◽  
Load Bearing ◽  
Static Strain ◽  
Environment Adaptation ◽  
Fibrous Tissues

Fibrous tissues have the ability to adapt to their mechanical environment. Adaptation can be guided by the direction and magnitude of the imposed load, leading to structural changes and altered mechanical properties. This is important for proper functioning of all fibrous tissues, especially those with a load bearing capacity such as tendons, ligaments, and tissue-supporting fibrous sheets. The mechanism by which fibrous tissues adapt to alterations in their mechanical environment remains unresolved, and such knowledge will be helpful to guide repair and engineering of artificial fibrous tissues.

Automated assessment of reinforced concrete slabs using a pseudo-lower bound method: Case studies

2019 ◽  
Vol 26 (4) ◽  
pp. 146-156
Author(s):  
Michele De Filippo ◽  
J S Kuang
Keyword(s):  
Reinforced Concrete ◽  
Lower Bound ◽  
Bearing Capacity ◽  
Case Studies ◽  
Great Accuracy ◽  
Concrete Slabs ◽  
Collapse Mechanism ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Reinforced Concrete Slabs

Despite the widespread usage of reinforced concrete slabs in construction industry, nowadays disasters due to sudden failure of such structures still occur. Assessment analyses of reinforced concrete slabs can nowadays be performed with a multitude of techniques, but many such methods are computationally too onerous, non-automated or overconservative. This paper proposes applications of a novel pseudo-lower bound method for evaluating the load-bearing capacity of slabs and estimating the most critical collapse mechanism. Such applications compare the results of analytical solutions, experiments and other bound methods with those obtained with the proposed pseudo-lower bound method. The case studies show evidence that great accuracy is achieved in terms of both estimation of load-bearing capacity and detection of collapse mechanism. The analysed case studies include different geometries, boundary conditions, loads and reinforcement layouts. Such numerical applications are presented in order to benchmark the accuracy and usefulness of the method.

Study on the Collapse Mechanism of the Hard Roof Rocks

2012 ◽  
Vol 524-527 ◽  
pp. 722-725
Author(s):  
Qing Guo Huang ◽  
Feng Gao ◽  
Jun Zhao
Keyword(s):  
Bearing Capacity ◽  
Structural Mechanics ◽  
Collapse Mechanism ◽  
Domino Effect ◽  
Coal Seams ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Hard Roof ◽  
Coal Pillars ◽  
Roof Rocks

The collapse of the hard roof rocks was characterized by its sudden and entire breakage and falling during the mining of the shallow-thick coal seams in Datong district. In this paper, structural mechanics methods was used to study the collapse mechanism of the hard roof rocks. The results showed that when some of the coal pillars lost their load bearing capacity, the pressure of the surronding rocks would be transferred to the left ones which were also to be damaged due to the extra load, and this would cause a domino effect of the adjacent pillars’s failure, and eventually cause the entire collapse of the hard roof rocks.

Increased load bearing capacity of mechanically joined FRP/metal joints using a pin structured auxiliary joining element

2020 ◽  
Vol 62 (1) ◽  
pp. 55-60
Author(s):  
Per Heyser ◽  
Vadim Sartisson ◽  
Gerson Meschut ◽  
Marcel Droß ◽  
Klaus Dröder
Keyword(s):  
Bearing Capacity ◽  
Load Bearing Capacity ◽  
Load Bearing

Load-Bearing Capacity of Direct Inlay-Retained Fibre-reinforced Composite Fixed Partial Dentures with Different Cross-Sectional Pontic Design

2017 ◽  
Vol 68 (1) ◽  
pp. 94-100
Author(s):  
Oana Tanculescu ◽  
Adrian Doloca ◽  
Raluca Maria Vieriu ◽  
Florentina Mocanu ◽  
Gabriela Ifteni ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Fracture Pattern ◽  
Load Bearing Capacity ◽  
Cross Sectional ◽  
Load Bearing ◽  
Reinforced Composite ◽  
Polyethylene Fibre

The load-bearing capacity and fracture pattern of direct inlay-retained FRC FDPs with two different cross-sectional designs of the ponticwere tested. The aim of the study was to evaluate a new fibre disposition. Two types of composites, Filtek Bulk Fill Posterior Restorative and Filtek Z250 (3M/ESPE, St. Paul, MN, USA), and one braided polyethylene fibre, Construct (Kerr, USA) were used. The results of the study suggested that the new tested disposition of the fibres prevented in some extend the delamination of the composite on buccal and facial sides of the pontic and increased the load-bearing capacity of the bridges.

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