Narrow Reinforced Concrete Slabs after their Flexural Destruction

2014 ◽  
Vol 969 ◽  
pp. 271-275 ◽  
Author(s):  
Mirosław Wieczorek
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
The Self ◽  
Concrete Slabs ◽  
Building Structures ◽  
Reinforcing Steel ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Horizontal Shift ◽  
Reinforced Concrete Slabs

In the course of the exploitation of building structures frequently situations turn up, in which the structure is not adequately used (it may, for instance, be exposed to considerably greater loads than previously been intended). In the state of an unforeseen overload of the structure, essential reserves of their load-bearing capacity may be disclosed in the case of the self-acting work as a flexible strand. The paper presents the results of investigations concerning the influence of the parameters of reinforcing steel on the mechanism of the destruction of six single-span models of narrow reinforced concrete slabs, in which a horizontal shift of the supports was not possible. The tests were carried out on narrow slabs with the dimensions 3860×480×100 mm. The results of the tests were compared with analytical calculations.

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.

TIMBER-CONCRETE COMPOSITE-A HIGH-EFFICIENT AND SUSTAINABLE CONSTRUCTION METHOD

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Klaus Holschemacher
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
High Efficiency ◽  
Concrete Slab ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Shear Connectors ◽  
Reinforced Concrete Slabs ◽  
High Efficient ◽  
Timber Beams

Timber-concrete composite (TCC) is a well-tried building method for construction of sustainable and robust floor systems with high load-bearing capacity. TCC sections consist of timber beams linked by shear connectors with a plain or reinforced concrete slab. Usually, by the shear connectors only flexible bond between the timber beams and the concrete slab may be provided. Nevertheless, TCC slabs have high flexural stiffness and appropriate load-bearing capacity enabling their application in residential and office buildings, and even in bridge construction. The paper reports state-of-the-art and recent developments in design and construction of TCC slabs. Especially, in the context of revaluation and strengthening of existing timber-beam ceilings it is a widely accepted technique today. But also, in design of new buildings, TCC slabs are an advantageous solution because of their reduced environmental impact in contrast to traditional reinforced concrete slabs. By many examples in recent design practice the high efficiency of TCC systems was proved.

scholarly journals Modeling of joint work of steel beam constructions with reinforced concrete ribbed floor slabs

2021 ◽  
pp. 44-57
Author(s):  
Yevhen Dmytrenko
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Precast Concrete ◽  
Concrete Slabs ◽  
Effective Width ◽  
Joint Work ◽  
Load Bearing ◽  
Reinforced Concrete Slabs ◽  
Industrial Buildings ◽  
Floor Slabs

Traditional methods of calculation of beam constructions of floors and coverings of industrial buildings assume their consideration when calculating separately from the frame structures, in particular, reinforced concrete slabs, without taking into account their joint work, which leads to a significant margin of safety. Today in Ukraine there is a significant number of industrial buildings and structures that need strengthening and reconstruction. In this regard, of particular importance are studies of the actual load-bearing capacity of the frames of single-storey and multi-storey industrial buildings, and both in the reconstruction and in new construction, the results of which will significantly reduce costs and more rationally design structures. At the same time, one of the most relevant areas is the study of the joint work of metal load-bearing structures with prefabricated reinforced concrete structures of rigid disks of coatings and floors in their calculation.           Moreover, in the national building codes, as well as in the educational and methodological literature, the calculation methods of taking into account the joint work of such constructions are not fully covered. The purpose of this work is to estimate the reduction of mass of the metal beam structure in its calculation in bending, taking into account the joint work with the rigid disk of the floor consist of precast concrete. As part of the study, the calculation of the floor beam according to the traditional calculation scheme - without taking into account the joint work with the floor slab, the calculation of its cross-section taking into account the joint work with floor slabs and experimental numerical study of the floor by the finite element method. Modeling of the floor fragment was performed in the software packages "SCAD Office" and "LIRA CAD 2019". Numerical research is aimed at verifying the feasibility of using the calculation methodology of DBN B.2.6-98-2009 to determine the effective width of the shelf when calculating the T-sections for prefabricated reinforced concrete slabs, which are included in the joint work with the floor beams. A comparative analysis of the obtained cross-section of the beam with the beam which was previously calculated by the traditional method of calculation  in stresses in the most dangerous cross section and the total mass of the beams. According to the results of the analysis, the correctness of the application of the above normative method for determining the effective width of the shelf of T-bending reinforced concrete elements was confirmed.

scholarly journals A concrete prefabricated slab as a technology for reconstructing damaged, local air-field pavements

2018 ◽  
Vol 2018 (12) ◽  
pp. 51-64
Author(s):  
Mariusz Wesołowski ◽  
Bartosz Świerzewski
Keyword(s):  
Bearing Capacity ◽  
Field Tests ◽  
Working Life ◽  
Concrete Slabs ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
The Real ◽  
International Airport ◽  
Fast Reconstruction

The age of currently operated concrete airfield pavements in Poland exceeds 30 years opera-tion period many times. Such a long working life of airfield pavements forced to search for the efficient and fast technologies of their reconstruction. The article described in detail the technologies of fast reconstruction of airfield concrete slabs using prefabricated slabs. The addressed technology guarantees the reconstruction and even the improvement of the condi-tion of load-bearing capacity of mentioned airfield slabs which was confirmed during labora-tory tests, field tests and practically verified in the real operation in the International Airport Kraków-Balice.

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