scholarly journals CRACKING ANALYSIS OF PRECAST – IN SITU REINFORCED CONCRETE SLAB WITH PLASTIC VOID FORMERS

2022 ◽  
Vol 14 (0) ◽  
pp. 1-5
Author(s):  
Juozas Masėnas
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Numerical Model ◽  
Concrete Slab ◽  
Shear Stiffness ◽  
Reinforced Concrete Slab ◽  
Cracking Pattern

In this article results of experimental and numerical analysis of precast – in situ reinforced concrete slab with plastic void formers are discussed. Slab is composed of precast and in situ concrete layers. Voids are formed inside the slab using spherical plastic void formers. Slab cracking pattern is determined by numerical analysis. Cracking pattern acquired by numerical analysis is compared to cracking pattern determined by experimental study. Shear stiffness in the bond between precast and in situ concrete layers was specified when numerical model was built.

Experimental Study on Earth Pressure of Corrugated Steel Culvert under High Fill Embankment

2013 ◽  
Vol 405-408 ◽  
pp. 1815-1819
Author(s):  
Wen Sheng Yu ◽  
Zhu Long Li ◽  
Xiao Ru Xie ◽  
Li Yuan Guo
Keyword(s):  
Mechanical Property ◽  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Earth Pressure ◽  
Reinforced Concrete Slab ◽  
The Earth ◽  
Filling Height ◽  
Test Points ◽  
Better Than

To analyze the earth pressure of corrugated steel culvert under high fill embankment, a field test was taken and the change law was got with the filling height increasing, the force state when geotechnical grilles were laid on the top of corrugated steel culvert was compared to that of reinforced concrete slab culvert. Results show that the pressure on the top of corrugated steel culvert is smaller than that on the external in same level when test points are near to culvert, the values of test points above and below geotechnical grilles are close, and the pressure of corrugated steel culvert is smaller than that of reinforced concrete slab culvert when filling height is above 7.3 m. So analysis indicates corrugated steel culvert spreads the upper load better, the geotechnical grille can reduce the pressure effectively through earth pressure redistribution, and the mechanical property of corrugated steel culvert is better than reinforced concrete slab culvert under high fill embankment.

scholarly journals Investigation on Structural Behavior of Bamboo Reinforced Concrete Slabs under Concentrated Load

2021 ◽  
Vol 50 (1) ◽  
pp. 227-238
Author(s):  
Yanuar Haryanto ◽  
Nanang Gunawan Wariyatno ◽  
Hsuan-Teh Hu ◽  
Ay Lie Han ◽  
Banu Ardi Hidayat
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Absorption Capacity ◽  
Concrete Slabs ◽  
Structural Behaviour ◽  
Reinforced Concrete Slab ◽  
Concentrated Load ◽  
Steel Reinforced Concrete ◽  
Reinforced Concrete Slabs ◽  
Cracking Pattern

Reinforced concrete is perhaps the most widely used building material in the world. However, the materials used for reinforcement of concrete i.e. steel is quite expensive and scarcely available in the developing world. As a result, bamboo is considered to be a cheaper replacement with high tensile strength. This research investigated the structural behaviour of bamboo-reinforced concrete slabs used for footplate foundation subjected to concentrated load. For this purpose, four different reinforced concrete slab panels were developed and analyzed. The influence of replacing steel with bamboo for the reinforcement of concrete slabs on their structural behaviour was assessed by determining the load-deflection characteristics, the ultimate load, the stiffness, the ductility, the cracking pattern, and the energy absorption capacity. The results showed that in comparison to steel reinforced concrete slabs, the strength of 82% can be acquired by the bamboo reinforced slabs. Furthermore, ductility demonstrated by the two types of specimens was almost equivalent i.e. up to 93%. Those indicated that the structural behaviour demonstrated by bamboo reinforced slabs is quite comparable to that of steel reinforced concrete slabs. Therefore, bamboo can prove to be a promising substitute for steel in concrete reinforcement. Future studies may further examine this opportunity.

scholarly journals DETERMINATION OF THE MOVEMENTS OF THE COMBINED FLOORING USING PROFILED FLOORING FROM HORIZONTAL LOADS

2021 ◽  
Vol 6 (9) ◽  
pp. 37-44
Author(s):  
O. Efimov ◽  
L. Gimranov ◽  
A. Fattahova ◽  
M. Chekanin
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Shear Stiffness ◽  
Horizontal Load ◽  
Joint Work ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Common Solution ◽  
Supporting Frame

Combined steel-reinforced concrete floors using profiled flooring are the most common solution in buildings with a steel frame. Flexible stops ensure the joint work of the frame and the flooring disks. Deformations of the combined flooring, and therefore of the frame in the horizontal plane, can occur due to the possible appearance of uneven force effects that cause a shift. At the same time, the magnitude of these deformations is influenced by both the level of force influences and the shear stiffness of the flooring disk, as well as the malleability of the flexible stops connecting the latter to the supporting frame. The paper proposes a method for determining the deformations of the flooring disk and the supporting frame from a horizontal load. The problem is considered in which a square floor slab is based on a contour on the crossbars of the frame, but its fixing with flexible stops is provided on two parallel sides. A formula for determining the movements of the frame from the horizontal load is proposed. The displacement of the flooring disk is analytically determined, it is noted how the malleability of flexible stops affects the determination of the final result. Using the example of a numerical experiment, the possibility of using the proposed method is demonstrated. The movement in the flooring disks will allow to assess the rigidity of the frame from horizontal loads without focusing on the deformation of each component of the steel-reinforced concrete slab. In addition, it will help to use materials and resources more efficiently by optimizing design solutions.

scholarly journals Deflection Analysis of Layered Slabs with Plastic Inserts

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6050
Author(s):  
Juozas Masėnas ◽  
Remigijus Šalna ◽  
Linas Juknevičius ◽  
Juozas Valivonis
Keyword(s):  
Reinforced Concrete ◽  
Analytical Method ◽  
Concrete Slab ◽  
Shear Stiffness ◽  
Linear Stage ◽  
Reinforced Concrete Slab ◽  
Calculation Results ◽  
Deflection Analysis ◽  
Numerical Research ◽  
Experimental Values

The article deals with experimental and numerical research of the layered reinforced concrete slab with plastic inserts. The investigated layered reinforced concrete slab is made of prefabricated and monolithic reinforced concrete layers. Voids were formed in the plate with spherical plastic inserts. With reference to the built-up bars theory, the paper proposes an analytical method for calculating the deflection of the layered reinforced concrete structures in non-linear stage, when bond between layers is partially rigid. The article also focuses on the numerical simulation of the layered slab, compares the estimated theoretical values of deflection with the experimental values and assesses the shear stiffness of the bond of prefabricated and monolithic concrete layers for calculating the deflection of the reinforced concrete slab. Paper presents the parametric analysis of deflection dependence on shear stiffness and the width of the contact zone of the layers. It was established that proposed analytical method and numerical analysis properly characterise the behaviour of the slab. Calculation results were close to experimental data. Moreover, it was determined that performance of this type of slab is highly influenced by shear stiffness of the bond between the concrete layers. Analysis confirmed that slab fails when bond is damaged, and layers slip in the support zone.

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