Dynamic Relaxation Method for Load Capacity Analysis of Reinforced Concrete Elements

Szcześniak, Anna; Stolarski, Adam

doi:10.3390/app8030396

Cited by 6 publications

(6 citation statements)

References 26 publications

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“…This is very important in the case of non-biodegradable or hardly decomposable materials such as polymers or glass waste. Polymer materials have been used as a replacement for natural aggregate in concrete [ 21 , 22 , 23 , 24 , 25 ], replacement of cement [ 26 , 27 , 28 ], additions (e.g., PET bottles [ 29 , 30 , 31 ], polyvinyl chloride (PVC) pipes [ 32 ], high density polyethylene (HDPE) [ 33 ], and thermosetting plastics [ 34 ]), expanded polystyrene foam (EPS) [ 35 ], polypropylene fibres [ 31 , 36 , 37 ], admixtures (e.g., polycarbonate and polyurethane foam [ 38 , 39 , 40 ]), or elements to concrete (e.g., concrete reinforcing bars [ 41 ] and plastic anchors [ 3 , 42 , 43 ]). The used polypropylene fibre by-products of recycling plastic packaging in concrete compared with plain concrete have been discussed in detail in a previous study [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Polypropylene Fibre-Reinforced Cement–Glass Composite

et al. 2021

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In accordance with the principles of sustainable development, environmentally friendly, low-emission, and energy-intensive materials and technologies, as well as waste management, should be used. Concrete production is responsible for significant energy consumption and CO2 production; therefore, it is necessary to look for new solutions in which components are replaced by other materials, preferably recycled. A positive way is to use glass waste. In order to determine the effect of a significant glass cullet content on the properties of concrete, glass powder was used as a filler and 100% glass aggregate. The cement–glass composite has low tensile strength and brittle failure. In order to improve tensile strength, the effects of adding polypropylene fibres on the mechanical properties of the composite were investigated. With the addition of 300, 600, 900, 1200, and 1500 g/m3 of fibres, which corresponds to 0.0625%, 0.1250%, 0.1875%, 0.2500%, and 0.3125% of cement mass, respectively, flexural strength increased compared with the base sample by 4.1%, 8.2%, 14.3%, 20.4%, and 26.5%, respectively, while the increase in splitting strength was 35%, 45%, 115%, 135%, and 185%, respectively. Moreover, with the addition of fibres, a decrease in slump by 25.9%, 39.7%, 48.3%, 56.9%, and 65.5%, respectively, compared with the reference specimen was determined.

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Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Polypropylene Fibre-Reinforced Cement–Glass Composite

et al. 2021

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“…However, the results presented in [50] relate to concretes subjected to static loads only. However, it should be emphasized that the situations when it is necessary to take into account dynamic loads in the analyses of concrete structures are numerous, e.g., [51][52][53][54][55][56][57][58][59][60][61]. Their summary is presented in detail in Section 2.…”

Section: Introductionmentioning

confidence: 99%

The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

Golewski

2021

Energies

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The paper presents results of tests on the effect of the addition of fly ash (FA) in the amounts of 0%, 20%, and 30% by weight of cement on the interfacial microcracks in concrete composites subjected to dynamic loads. The analyses were carried out based on the results of the microstructural tests using a scanning electron microscope (SEM). The average width of the microcracks (Wc) in the interfacial transition zone (ITZ) of coarse aggregate with cement matrix was evaluated. During the studies beneficial effect of the addition of FA on reduction of the size of Wc in the ITZ of concrete composites under dynamic loading were observed. Based on obtained test results, it was found that using the 20% FA additive causes favorable changes in the microstructure of mature concrete. In this composite, the average value of Wc was lower by more than 40% compared to the result obtained for the reference concrete. In contrast, concrete containing 30% FA additive had greater microcracks in the ITZ area by over 60% compared to the material without additive. In all analyzed composites, an increase in the Wc value by almost 70% to over 110% in the case of occurrence of dynamic loads was also observed. This was the most evident in the case of concrete with a higher content of FA.

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“…This method employs nonlinear equilibrium equations with damping (i.e. irregular motion) in form-finding of tensegrity structures [5]. Iteration steps by mimicking a pseudo dynamic in time process which involve repetitive formulation of velocities and nodal forces begins with an initial configuration until satisfaction of equilibrium condition [6].…”

Section: Kinematical Methodsmentioning

confidence: 99%

Overview on the Form-Finding of Tensegrity Structure

Farhana¹,

Lian²,

Yee³

et al. 2018

IJET

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This paper presents an overview of the previous research on the form finding structures which include tensegrity and biotensegrity structure. Tensegrity systems have been widely used for many applications due to the stability and flexibility of the structures. On technologies era nowadays, a stable structure is needed to implement for new developments especially robotics and machineries. Therefore, the importance of finding the shape or design configuration is to ensure it is in self-equilibrium which able to support itself. In order to build new structures which lies on general requirement, previous researchers have proposed several form-finding methods for instance by using force density method, advance force density method, finite element method, dynamic relaxation method, genetic algorithm, novel linear approach and Monte Carlo method. What kind of stable structures can be produced and how efficient the structures by using those methods? In this paper, understanding on the form-finding methods and various numerical examples of form-finding conducted in previous studies are presented to enhance researchers’ knowledge on the form-finding of tensegrity structures.

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Dynamic Relaxation Method for Load Capacity Analysis of Reinforced Concrete Elements

Abstract: Featured Application: predicting the development of structural elements failure and analysis of the construction systems' safety, the dynamic analysis of structures with damping.

Cited by 6 publications

References 26 publications

Physical and Mechanical Properties of Polypropylene Fibre-Reinforced Cement–Glass Composite

Physical and Mechanical Properties of Polypropylene Fibre-Reinforced Cement–Glass Composite

The Beneficial Effect of the Addition of Fly Ash on Reduction of the Size of Microcracks in the ITZ of Concrete Composites under Dynamic Loading

Overview on the Form-Finding of Tensegrity Structure

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