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 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 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.

Steel-Reinforced Concrete Floors With The Use Of Bent Steel Profiles

2020 ◽  
pp. 10-14
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Concrete Strength ◽  
Theoretical Research ◽  
Steel Beams ◽  
Reinforced Concrete Structure ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Advantages And Disadvantages ◽  
Concrete Strengthening

The issues of designing a steel-reinforced concrete floor using bent steel profiles are considered. The steel-reinforced concrete flooring consists of a monolithic reinforced concrete slab arranged on a removable formwork, and steel bent profiles. The removable formwork during the concreting process rests on steel beams without additional mounting posts in the floor span. Steel beams accept the weight of the formwork and concrete during the pouring, working on bending. After concrete strengthening, they mainly work on stretching as part of composite steel-reinforced concrete structure. The article has identified the advantages and disadvantages of steel-reinforced concrete flooring with the use of light steel thin-walled bent profiles. Checking the strength of the beam at the concreting stage and evaluating the load-bearing capacity of the floor after the concrete strength is set confirm the performance of this structure. Using the regulatory methodology for SP 266.1325800.2016, the area of implementation of steel and concrete flooring with CFS beams and the nomenclature of applied steel beams have been established. For practical application of the presented design, it is recommended to conduct experimental and theoretical research and develop engineering methods.

scholarly journals The search for sustainable parameters for steel-reinforced concrete section of a bridge superstructure

2018 ◽  
Vol 230 ◽  
pp. 02015
Author(s):  
Yuriy Krul ◽  
Roman Kaplin
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
High Strength ◽  
Theoretical Models ◽  
Iteration Algorithm ◽  
Geometrical Parameters ◽  
Slab Thickness ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Bridge Superstructure

The article contains the description of an efficient lightweight steel-reinforced concrete bridge superstructure, which includes metal blocks with a box-like section and reinforced concrete efficient roadway slab. Metal blocks are made of sheet perforated elements manufactured according to the no-waste technology. The blocks are interconnected as a single space bridge superstructure frame by means of high strength bolts. The reinforced concrete slab of the roadway is an efficient hollow slab. It includes upper and lower housing, inner ribs placed with a particular pitch, and all its remained part is filled with polystyrene foam extractable fillers along its height. At this, a rib height is equal to the full slab height. The metal and reinforced concrete parts are linked by means of a special system of shearing connections. The article describes an iteration algorithm of the construction enhancement, in course of which the geometrical parameters, such as bridge superstructure section full height, reinforced concrete slab thickness and a construction metal part height were defined. Theoretical models being the ground for the strain-stress state (SSS) of the sections studied analysis were developed.

The Typical Methods of Using Section Steel Reinforced Concrete Beams and Slab

2012 ◽  
Vol 204-208 ◽  
pp. 885-888
Author(s):  
Xiu Hua Li ◽  
Cheng Wu Wang ◽  
Chen Xi Yue ◽  
Jiang Dong Cai
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Concrete Slab ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Reinforced Concrete Slab ◽  
State Regulations ◽  
Steel Reinforced Concrete ◽  
Industrial Buildings

The technology of Concrete beams and slab reinforcement is one of the key technologies of reinforcing and reusing existing buildings. There are many ways of reinforcement on the components and there are also some relevant state regulations. Take the carbon fiber sheet reinforcement technology as an example. It is mainly used to improve the bearing capacity of concrete, but plays limited role in improving the stiffness of concrete. When the changes in the load of industrial buildings are relatively large, it is difficult for this approach to achieve the purpose of reinforcement. While using section steel reinforced concrete slab can not only improve the bearing capacity of beams and plates, but also significantly increase the stiffness of beams and slab. The paper by introducing different methods of section steel reinforced concrete beam, beam end bearing and slab, the essay shows the improvement that a variety of reinforcement methods have made on bearing capacity and stiffness, and points out the precautions during the construction, which provides a reference for engineering applications.

scholarly journals Fatigue Tests of Concrete Slabs Reinforced with Stainless Steel Bars

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Guoxue Zhang ◽  
Ying Zhang ◽  
Yangyang Zhou
Keyword(s):  
Stainless Steel ◽  
Reinforced Concrete ◽  
Fatigue Life ◽  
Concrete Slab ◽  
Reinforcement Ratio ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Steel Rebar ◽  
Maximum Crack ◽  
Ordinary Steel

Experimental studies on fatigue behavior of reinforced concrete slab with stainless steel rebar and carbon steel rebar have shown that, at the same reinforcement ratio, the slope of the deflection-cycle number curves of stainless steel-reinforced concrete slab is lower than that of ordinary steel-reinforced concrete slab. The higher the reinforcement ratio is, the smaller the maximum crack width would be. Higher stress level contributes to larger deflection and reinforcement strain in midspan and shorter fatigue life. Compared to the ordinary steel-reinforced concrete slab, the stainless steel-reinforced concrete slab shows narrower maximum crack under the same number of loading cycles. Less significant midspan deflection, reinforcement strain, and longer fatigue life are observed in stainless steel-reinforced concrete slab at the same reinforcement ratio, stress level, and cycling time. With the increase of reinforcement ratio, the deflection and fatigue life extended.

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.

Approach to the Load Resistance in Two Kinds of Bamboo Reinforced Concrete Slab

2011 ◽  
Vol 261-263 ◽  
pp. 459-463
Author(s):  
Camilo Flores Bastidas ◽  
Constanza Lucia Flores Bastidas ◽  
Jun Ichiro Giorgos Tsutsumi ◽  
Caori Patricia Takeuchi
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Load Resistance ◽  
Strength Properties ◽  
Load Test ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Composite Slabs ◽  
Material Load ◽  
Bamboo Stem

Steel reinforced concrete is generally used in houses structure elements. However bamboo strength properties similarly to the wood, make it an alternative concrete composite material. Load test were performed in two kinds of bamboo guadua concrete reinforced composite slabs. During the tests the slabs functioned as domestic roofing-flooring in standing houses, the slab systems tested were bamboo stem covered slab and stem free slab. Two different tests were designed to measure the deflection in the middle of the composite slab and along a single bamboo stem. In three different slab sizes and after replications, no deflection under the applied load was recorded. Therefore, bamboo composite slabs without steel reinforcing seem likely to be used in long lasting houses for middle and high class dwellings in Colombia.

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