EXPEDIENCY OF CHOICE OF CARDBOARD — POLYETHYLENE PIPES OF ROUND SECTION AS UNEXTRACTIVE PUSTOTOOBRAZOVATELEJ FOR MONOLITHIC REINFORCE-CONCRETE BEAM FLAGS OF CEILING

2020 ◽  
pp. 86-91
Author(s):  
B.A. Pushkarev ◽  
N.B. Burenina
Keyword(s):  
Concrete Beam ◽  
Reinforce Concrete ◽  
Moisture Resistance ◽  
Polyethylene Pipes ◽  
Reinforce Concrete Beam ◽  
New Construction ◽  
Analysis Design ◽  
Energy Consumptions ◽  
Round Section ◽  
Selection Of

A study sent to the search of the most effective construction of unextractive pustotoobrazovatelej with the purpose of decline of weight and cost of monolithic reinforce-concrete beam flags of ceiling is undertaken in the article. The selection of materials is executed for unextractive pustoobrazovatelja on the basis of comparison of different materials on energy consumptions on their production. The new construction of unextractive pustoobrazovatelja is reasonable and offer with the use of cardboard-polyethylene pipe of round section. Recommendations are given on the parameters of pustoobrazovatelja depending on length of flight of ceiling flag. The methods of testing, analysis, design, study, comparison and generalization are applied. On the basis of comparison of totality of properties of different pustotoobrazovatelej (form, durability, inflexibility, moisture resistance, volume of substituting for a concrete, industrial applicability, labor intensiveness, jenergozatratnosti) the best pustotoobrazovatelem appeared offered cardboard-polyethylene pustotoobrazovatel’ made from the cardboard pipes of round section covered by polyethylene tape in 0,045 mm thick.

Digital Imagine Correlation (DIC) Method for Detecting Crack Development in Construction Materials Subject to Loading

2010 ◽  
Vol 44-47 ◽  
pp. 2524-2528 ◽  
Author(s):  
Wen Pei Sung ◽  
Ming Hsiang Shih ◽  
Yu Kuang Zhao
Keyword(s):  
Concrete Beam ◽  
Construction Materials ◽  
Reinforce Concrete ◽  
Reinforced Concrete Beam ◽  
Crack Development ◽  
Image Correlation ◽  
Brick Wall ◽  
Reinforce Concrete Beam ◽  
Von Mises ◽  
Dic Technique

The digital image correlation (DIC) technique is developed for identifying the crack development in brick wall and reinforced concrete beam. This method is tested on brick wall and reinforce concrete beam to evaluate the observation with various strain quantities and mesh sizes. The analysis results reveal that using the von Mises strain field will lead to fine precision of crack observation, and that clearer imagines can be obtained with smaller mesh sizes. This technique is capable of judging crack loading to predict crack occurrences.

scholarly journals Investigating the effect of vibration on the stability of the three-wheeled scooter taxi

2021 ◽  
Vol 39 (4) ◽  
pp. 1117-1122
Author(s):  
S.J. Ojolo ◽  
O.O. Ajayi ◽  
G.A. Asuelinmen
Keyword(s):  
Excitation Frequency ◽  
Vehicle Safety ◽  
Asian Countries ◽  
Wheeled Vehicle ◽  
Safety Margins ◽  
Schematic Layout ◽  
Analysis Design ◽  
The Stability ◽  
The Impact ◽  
Selection Of

The present three wheeled scooter taxi (TWST) that are widespread in Africa and Asian Countries are fuel economical and inexpensive. However, they are unstable due to their schematic layout. This instability places limitation on the usage of the vehicle. Researchers have investigated the rollover and lateral stabilities of this vehicle, including the effect of vibration on the comfort of the riders. However, not much work has been done on the impact of vibration on the stability of the vehicle. These instabilities could be induced by trenches, potholes, uneven and ungraded roads that are prevalent in developing countries. Therefore, this work modelled and analysed the effect of vibration on a TWST using a standard road bump as reference point. The results proved the vehicle to be unstable in the vicinity of excitation frequency of 15.95rad/sec and spring constant of 68,600N/m due to resonance. This would affect safety of life and property. Therefore, it would be appropriate for some of the manufacturers of these vehicles to provide for enough safety margins in the design and selection of springs where the vehicles are rollover and laterally unstable. This will enhance the vehicle safety and receptivity. Keywords: Three wheeled Vehicle, Vibration Modelling and Analysis, Design, Safety of Life and Property

Reinforcement of Prefabricate Concrete Beams with Basalt-Epoxy Bars

2014 ◽  
Vol 1020 ◽  
pp. 275-279
Author(s):  
Marlena Rajczyk ◽  
Bartłomiej Stachecki
Keyword(s):  
Numerical Modeling ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Physical Parameters ◽  
Modern Engineering ◽  
New Construction ◽  
Prefabricated Structure ◽  
Reinforcement Conditioning ◽  
Made In ◽  
Composite Reinforcement

The article presents a way of reinforcing concrete beams with innovative composite materials in the form of basaltic-epoxy bars. Considering the carrying the element out in the technology of the prefabrication, the main assumptions and aims of the method and economic conditioning were described. Examples of domestic, modern engineering objects made in the prefabricated structure were expressed. The particular attention was devoted to the issue of the cover of the composite reinforcement conditioning the permanence of the ready element. In the part of the article devoted to the numerical analysis of the new construction, is characterized the most important mechanical and physical parameters of used composite bars and presented the assumptions of the method of the numerical modeling of beams subjected to clean bending. For the optimum evaluation of the element a research set was prepared in the form of the reinforced beam by composite bars, and another one by steel rods and concrete beam without the reinforcement - enabling evaluation of the correctness of the method. The analysis is opening the doors for the more accurately research on the usefulness of the composite reinforcement of the concrete prefabrication to the modern construction.

Foam Concrete Gravity Wedges as a Thermal Insulation of Flat Roofs

2016 ◽  
Vol 722 ◽  
pp. 331-336 ◽  
Author(s):  
Karel Mikulica ◽  
Martin Labaj
Keyword(s):  
Thermal Insulation ◽  
Cost Reduction ◽  
Mineral Wool ◽  
Foam Concrete ◽  
Roof Structure ◽  
Good Grasp ◽  
Speed Up ◽  
New Construction ◽  
Flat Roofs ◽  
Selection Of

Proper selection of thermal insulation materials is an essential part of almost any construction project, whether it is a new construction, renovation or revitalization. There is a large number of materials available on the market and it is often very difficult to have a good grasp. Though some material has very similar features, they often cannot replace each other. The same applies to single-shell flat roofs. So far the most often used thermal insulation boards are from polystyrene and mineral wool. Their installation is accompanied by a large volume of waste. The experimental part deals with the general assessment of the behavior and properties of foam concrete. This allows simplification of technology of thermal insulation laying. Besides the construction speed up and the overall cost reduction the improvement in mechanical properties of the roof structure has been achieved.

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