Reliability of Timber Structure Bolt Connection Subjected to Double Unequal Shears

2015 ◽  
Vol 752-753 ◽  
pp. 652-655 ◽  
Author(s):  
Josef Musílek ◽  
Karel Kubečka
Keyword(s):  
Limit State ◽  
Timber Structure ◽  
Thin Plates ◽  
Ultimate Limit State ◽  
Bolted Connections ◽  
Double Shear ◽  
Timber Member ◽  
Connection Type ◽  
Bolt Connection ◽  
Ultimate Limit

The paper deals with reliability in ultimate limit state of timber structure bolted connections subjected to unequal double shear with thin plates as outer members and inner timber member. There are derived equations for calculation of the reliability of this connection type in the ultimate limit state.

Load-Carrying Capacity of Timber Structure Bolt Connection Subjected to Double Unequal Shears

2015 ◽  
Vol 752-753 ◽  
pp. 711-714 ◽  
Author(s):  
Josef Musílek ◽  
Karel Kubečka
Keyword(s):  
Carrying Capacity ◽  
Limit State ◽  
Thin Plates ◽  
Ultimate Limit State ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Timber Member ◽  
Connection Type ◽  
Bolt Connection ◽  
Ultimate Limit

The paper deals with load-carrying capacity of bolted connections subjected to unequal double shears with thin plates as outer members and inner timber member. There are derived equations which describe the load-carrying capacity of this connection type in the ultimate limit state.

Calculation and Reliability Assessment of Timber Structure Bolt Connection Subjected to Double Unequal Shears

2015 ◽  
Vol 752-753 ◽  
pp. 648-651 ◽  
Author(s):  
Josef Musílek ◽  
Karel Kubečka
Keyword(s):  
Reliability Assessment ◽  
Timber Structure ◽  
Thin Plates ◽  
Bolted Connections ◽  
Double Shear ◽  
Timber Member ◽  
Bolt Connection

The paper shows the calculation and reliability assessment of bolted connections subjected to unequal double shear with thin plates as outer members and inner timber member. The concrete example is calculated and explained.

scholarly journals Propiedades del hormigón reciclado para el uso como soleras de hormigón en pavimentos industriales=Properties of recycled concrete to use as concrete slabs in industrial pavements

2018 ◽  
Vol 4 (2) ◽  
pp. 25
Author(s):  
M.A. Morales ◽  
J.A. Pérez ◽  
M. Del Rio ◽  
J.C. Sánchez ◽  
J. Casbas ◽  
...  
Keyword(s):  
Limit State ◽  
Recycled Concrete ◽  
Thin Plates ◽  
Concrete Slabs ◽  
Ultimate Limit State ◽  
Minimum Thickness ◽  
Ground Support ◽  
Useful Life ◽  
Support Conditions ◽  
Ultimate Limit

Resumen El presente estudio analiza el estado tensional de distintas placas delgadas apoyadas sobre terreno elástico empleando modelos de elementos finitos para distintos tipos de hormigones reciclados y de primer uso, distintos valores de las cargas y de las condiciones de apoyo del terreno, concluyendo que las tensiones que se obtienen en hormigones reciclados son aproximadamente un 4,5% menores que en hormigones fabricados con áridos de primer uso, en cualquiera de los casos analizados. Con los datos obtenidos para las tensiones, se han elaborado gráficas de dimensionamiento del espesor mínimo necesario en Estado Límite Último de flexión. Estas gráficas muestran menores espesores necesarios en el caso de hormigones reciclados, si bien las reducciones posibles no superan los 0,5 cm para las cargas analizadas. Otro aspecto a tener en cuenta es que, dado que el proceso de agotamiento por fatiga en el hormigón depende fundamentalmente de la máxima tensión alcanzada en el hormigón respecto de su capacidad resistente y no solo de la oscilación de tensiones, el hormigón reciclado permite alargar la vida útil de la estructura. Abstract The present study analyzes the tensional state of different thin plates supported on elastic terrain using finite element models for different types of recycled and first-use concretes, different values of loads and ground support conditions, concluding that the tensions that are obtained in recycled concretes are approximately 4.5% lower than in concrete made with aggregates of first use, in any of the cases analyzed. With the data obtained for the tensions, graphs of sizing of the minimum thickness necessary in Ultimate Limit State of flexion have been drawn up. These graphs show lower thicknesses required in the case of recycled concretes, although the possible reductions do not exceed 0.5 cm for the loads analyzed. Another aspect to be taken into account is that, given that the fatigue depletion process in concrete depends mainly on the maximum tension reached in the concrete with respect to its resistant capacity and not only the tension oscillation, the recycled concrete allows to extend the useful life of the structure.

Combined Reinforced Concrete Columns Strengthening with Steel Clipping and Concrete Surfacing

2021 ◽  
pp. 11-22
Author(s):  
Ю. Г. Москалькова ◽  
С. В. Данилов ◽  
В. А. Ржевуцкая
Keyword(s):  
Reinforced Concrete ◽  
Load Transfer ◽  
Limit State ◽  
Concrete Columns ◽  
Ultimate Limit State ◽  
Concrete Core ◽  
Reinforced Concrete Columns ◽  
Entire Height ◽  
Complex Structural ◽  
Ultimate Limit

Постановка задачи. Исследуется метод усиления железобетонных колонн устройством стальной обоймы с обетонированием, который позволяет восстанавливать эксплуатационные показатели колонн, имеющих значительные дефекты и повреждения. Предпосылкой настоящих исследований явилось предположение о том, что усиление стальной обоймой с обетонированием является эффективным способом повышения несущей способности железобетонных колонн, причем вариант приложения нагрузки - только на бетонное ядро или ко всему сечению - существенно на эффективность усиления не влияет. В связи с этим целью исследования является определение необходимости устройства стального оголовка и включения в работу ветвей стальной обоймы при условии обетонирования стержня колонны по всей высоте. Результаты и выводы. Рациональным признан способ передачи нагрузки только на бетонное ядро усиленных колонн, поскольку устройство оголовка стальной обоймы требует применения сложных конструктивно-технологических решений, но при этом дополнительно увеличивает несущую способность незначительно (согласно проведенным исследованиям менее чем на 10 %). Ввиду отсутствия необходимости устройства конструкций стального оголовка снижаются трудоемкость и сроки производства работ по усилению колонн. Statement of the problem. The method of strengthening reinforced concrete columns with a steel clipping and the concrete surfacing is investigated. This method allows one to repair the columns with significant defects and damage. The prerequisite for this study was the assumption of strengthening with a steel clipping and the concrete surfacing is an effective way to increase the ultimate limit state of reinforced concrete columns, furthermore, the option of applying the load (only to the concrete core or to the entire section) does not significantly affect the strengthening effectiveness. In this regard, the purpose of the investigation was to identify the need to include the steel jacketing in the work, on the condition the column is coated with concrete along with the entire height. Results and conclusions. The load transfer method only to the concrete core of the strengthened columns is recognized as rational since the device of the steel clipping head requires the use of complex structural and technological solutions, but at the same time additionally increases the ultimate limit state insignificantly (according to the studies by less than 10 %). Due to the absence of the need to establish structures of the steel jacketing head, the labor intensiveness and terms of work production on strengthening the columns are reduced.

Application potential of textile reinforcement in concrete construction for infrastructure buildings: environmental performance and availability

2021 ◽  
Author(s):  
Sara Reichenbach ◽  
Benjamin Kromoser ◽  
Philipp Preinstorfer ◽  
Tobias Huber
Keyword(s):  
High Performance ◽  
Construction Material ◽  
Limit State ◽  
Carbon Dioxide Emission ◽  
Resource Consumption ◽  
Ultimate Limit State ◽  
Textile Reinforced Concrete ◽  
Potential Applications ◽  
Application Potential ◽  
Ultimate Limit

<p>With the building industry being one of the main sources of carbon dioxide emission worldwide and concrete being the main construction material, new strategies have to be developed to reduce the carbon footprint thereof. The use of high-performance materials in structural concrete, as for example textile-reinforced concrete (TRC), seems to allow for a reduction of the resource consumption and the carbon emissions. The present paper addresses potential applications of TRC examining the global warming potential (GWP) of a rail platform barrier. The resource consumption is depicted in a parametrical study in terms of the necessary component height and reinforcement area considering both the serviceability limit state (SLS) as well as the ultimate limit state (ULS). The results clearly indicate an achievable reduction of the GWP during construction when using textile reinforcement made of high-performance fibres. Furthermore, an analysis of the European market was conducted to prove the availability of this new reinforcement type. </p>

Design capacities of joints with laterally loaded nails

2001 ◽  
Vol 28 (2) ◽  
pp. 282-290 ◽  
Author(s):  
Ian Smith ◽  
Steven T Craft ◽  
Pierre Quenneville
Keyword(s):  
Limit State ◽  
Ultimate Limit State ◽  
Joint Models ◽  
Yield Model ◽  
Rigid Plastic ◽  
Double Shear ◽  
Modelling Assumptions ◽  
Ultimate Limit State Design ◽  
Laterally Loaded ◽  
The Impact

Capacities of joints with laterally loaded nails may be predicted using "European yield" type models (EYMs) with various levels of complexity. EYMs presume that a nail and the wood on which it bears exhibit a rigid–plastic stress–strain response. Consideration is given in this paper to the "original" model published by K.W. Johansen in 1949, an empirical approximation proposed by L.R.J. Whale and coworkers in 1987, and a curtailed and "simplified" model proposed by H.J. Blass and coworkers in 1999. Predictions from the various EYMs are compared with experimentally determined ultimate capacities of single and double shear joints. Experiments covered a range of combinations of member thicknesses and two nail sizes. The impact of modelling assumptions is illustrated in the context of the Canadian timber design code. Suggestions are made regarding the necessary level of complexity for nailed joint models used in design.Key words: timber, joints, nails, yield model, ultimate limit state, design.

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