Bearing Capacity of Restored and Strengthened Reinforced Concrete Floor Slabs

2020 ◽  
pp. 21-27
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
High Efficiency ◽  
Raw Materials ◽  
Experimental Studies ◽  
Building Structures ◽  
Concrete Floor ◽  
Reinforced Concrete Slabs ◽  
Floor Slabs ◽  
External Reinforcement

The influence of various repair compositions on the bearing capacity of restored and strengthened floor slabs modeling flat reinforced concrete floor slabs of communication collectors is considered. Industrial brands of repair compositions based on cement binder, repair compositions containing quartz sand and mixing water after treatment with low-temperature non-equilibrium plasma, and materials for external reinforcement of building structures were used. It is shown that industrial repair compositions based on cement and repair compositions based on modified raw materials restore the bearing capacity of model floor slabs in almost the same way. In this case, the destruction of floor slabs occurs on the repair composition. It was established that the external reinforcement of reinforced concrete slabs restored with repair compositions using carbon mesh or tape significantly increases their bearing capacity. The high efficiency of the use of epoxy polymer composite materials for the repair and strengthening of reinforced concrete structures of various functional purposes is confirmed by the results of verification calculations of the initial and model floor slabs, as well as conducted experimental studies.

BEARING CAPACITY OF RECONDITIONED ARMORED CONCRETE FLOOR SLABS

2020 ◽  
Vol 91 (5) ◽  
pp. 77-86
Author(s):  
Yu.M. BAZHENOV ◽  
◽  
G.V. NALBANDYAN ◽  
V.A. USHKOV ◽  
◽  
...  
Keyword(s):  
Bearing Capacity ◽  
High Efficiency ◽  
Epoxy Composite ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Plasma Modification ◽  
Floor Slabs ◽  
Cementitious Binder ◽  
External Reinforcement ◽  
Functional Purpose

It has been substantiated that plasma treatment of raw components is expedient to enhance the physical and mechanical properties of building mortars based on cementitious binder. The developed method of plasma modification of raw components is notable for high efficiency and usability. It has been considered how repair compositions based on cementitious binder have influence on the mechanical strength of the reconditioned and armored floor slabs simulating flat floor slabs of communication conduits. It is shown that the repair compositions based on cementitious binder restore the bearing capacity of the floor slabs by 72.1–96.5%, and when tested for breakdown the reconditioned slabs fail within the repair composition. It has been found that after external reinforcement of the reconditioned armored floor slabs with CarbonWrap Tape 230/150 their bearing capacity increases by 1.7–3.8 times. The effectiveness of epoxy composite materials for strengthening of the building constructions of various functional purpose is proved with the results of experimental studies and checking calculations of the armored floor slabs.

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.

scholarly journals EVALUATING THE EFFECTIVE DESIGN OF REINFORCED CONCRETE FLOOR SLABS IN CIVIL WORKS IN TRA CU DISTRICT – TRA VINH PROVINCE

2020 ◽  
Vol 1 (35) ◽  
pp. 51-61
Author(s):  
Cong Thanh Nguyen ◽  
Nhung Hong Tu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slabs ◽  
Slab Thickness ◽  
Design Technique ◽  
Concrete Floor ◽  
Reinforced Concrete Slabs ◽  
Floor Slabs ◽  
Design Documents ◽  
Engineering Projects ◽  
Effective Design

This study was conducted to determine the effectiveness of the design of reinforced concrete slabs of several civil engineering projects in Tra Cu district – Tra Vinh province. Utilizing the design documents of 6 projects, these slabs were redesigned based on TCVN 5574 – 2018. The design results were compared with those provided in the design documents. The results show that most of the design in the provided documents was either greater than or equal to the end design studied: the slab thickness is from 0% - 20%, the steel percentage of the slabs are from 0% - 63,3%, and the concrete quantity is from 0% - 20%. In conclusion, it is recommended for engineers to select an optimal slab design technique in order to reduce dead loads, to provide a reasonablesteel percentage and still being capable of carrying loads, which will result in an effective design for the project.

scholarly journals Strengthening Klein’s floor slabs with the use of current norms

2015 ◽  
Vol 14 (4) ◽  
pp. 197-205
Author(s):  
Marcin Górecki ◽  
Dominika Franczak-Balmas
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slabs ◽  
Steel Beams ◽  
Structural Members ◽  
Existing Buildings ◽  
Concrete Floor ◽  
Reinforced Concrete Slabs ◽  
Floor Slabs

The paper presents the effectivity of using the steel-concrete floor slabs in existing buildings. Steel-concrete slabs described in this paper consist of old steel beams which are main structural members of the floor slabs and reinforced concrete slabs which are new elements of the floor slabs. Beams and reinforced concrete slabs are connected with connectors. The computational example which shows the efficiency of utilizing the steel-concrete floor slabs with the use of current norms has been presented in the paper.

Bending Effect On The Mechanism Of Punching The Support Zone Of The Reinforced Concrete Slab

2019 ◽  
pp. 20-28
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Strain State ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Reinforced Concrete Structure ◽  
Stress Strain ◽  
Reinforced Concrete Slab ◽  
Stress Strain State ◽  
Reinforced Concrete Slabs

The analysis of various regulatory methods for calculating reinforced concrete slabs for punching and comparing with experiment results is made. The tested sample, measuring equipment and test bench are described. Dimensions and materials for the production of the prototype were chosen on the basis of experience in the construction of girderless and capless regular monolithic reinforced concrete frames. The results of experimental studies of a fragment of a slab reinforced concrete structure in order to study the stress-strain state, when implementing the mechanism of punching, are presented. The results of observations obtained during the tests are presented. A comparison of the nature of operation of the tested fragment of the slab with the nature of operation of the full-fledged construction is given. A comparative analysis of the stress-strain state of the tested sample and the results of the calculation of the bearing capacity for punching according to various normative methods is performed. According to the results of the experiment, the main criteria determining the implementation of the punching mechanism are established, and a new method for calculating girderless floors is proposed on the basis of a fundamentally different approach in determining the bearing capacity.

Experimental and Computer Researches of Ferroconcrete Floor Slabs at High-Temperature Influences

2019 ◽  
Vol 968 ◽  
pp. 361-367 ◽  
Author(s):  
Andrii Kovalov ◽  
Yuriy Otrosh ◽  
Mykola Surianinov ◽  
Tatiana Kovalevska
Keyword(s):  
Computer Simulation ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Numerical Data ◽  
Technical Condition ◽  
Distribution Data ◽  
Building Structures ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs

The unsatisfactory technical condition of many buildings and structures is due to their aging and requires a quick technical condition assessment. The most promising way for experimental researches data verification is computer modeling of structures, also during a fire. It is advisable to use the ANSYS software. Experimental fire tests of reinforced concrete slabs were carried out. In order to assess the experiment quality and the reliability of the received temperature distribution data, it was used a reinforced concrete slab computer simulation in the ANSYS R.17.1 software system. There was provided a comparative analysis of experimental studies results and numerical data analysis. The results confirm that method of conducted experimental research and computer simulation with further numerical analysis can be recommended for practical application. The mathematical model makes possible operative prediction for the controlled parameters values of building structures.

scholarly journals The influence of depth of tensile concrete deterioration on the load bearing strength and deflections of corrosion-damaged floor slabs

2018 ◽  
Vol 251 ◽  
pp. 02012
Author(s):  
Ashot Tamrazyan ◽  
Arman Minasyan
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Concrete Slabs ◽  
Load Bearing ◽  
Concrete Floor ◽  
Bearing Strength ◽  
Concrete Deterioration ◽  
Reinforced Concrete Slabs ◽  
Floor Slabs ◽  
Tensile Zone

The paper considers the change of load-bearing strength and deflections of corrosion-damaged precast reinforced concrete floor slabs in the conditions of cyclic freezing-thawing in full-scale climatic conditions. The aim of the study is to determine the influence of the depth of tensile concrete deterioration on the change in load-bearing strength and deflections. Corrosion-damaged precast reinforced concrete floor slabs were selected and experimental investigation was performed. Based on the results of the study, the influence of the depth of deterioration of tensile zone of concrete on the load-bearing strength and deflections of structures was determined. At the same time, as the loads increase, deflections increase and the height of the compressive zone decreases. In the experimental investigation, changes of the load-bearing strength and deflections of precast reinforced concrete slabs were determined, depending on the depth of tensile concrete deterioration. The performed studies allow us to estimate the load-bearing strength and deflection values of corrosion-damaged reinforced concrete slabs depending on the relative value of the concrete deterioration in the tensile zone without performing additional experiments and calculations.

scholarly journals ACCOUNTING THE STEEL PROFILE IN THE CALCULATIONS OF THE LOADING CAPABILITY OF STEEL-CONCRETE BEAMS

2019 ◽  
pp. 26-33
Author(s):  
N. Vinogradova
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Experimental Studies ◽  
Structural Elements ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
External Reinforcement ◽  
Thin Walled ◽  
Monolithic Structure

Prefabricated monolithic floors are the best solution in terms of cost and time of work. In addition, due to the lightweight filling blocks included in the prefabricated monolithic structure, the overlap has less weight than the classic monolithic or precast slabs. Within the framework of this article, elements of prefabricated monolithic floors — reinforced concrete T-beams with a steel thin-walled profile, which is used primarily as formwork at the stage of construction and installation works, are calculated. Nevertheless, the calculation of the steel profile as an external reinforcement increases the load-bearing capacity of the beams by 50%. To assess the fact effect of the steel thin-walled profile on the strength characteristics of structural elements, experimental studies are conducted. According to the results of the experiment, it is found that the contribution of the steel thin-walled profile to the bearing capacity of the beams is 15%, while if the profile slip due to anchoring in the supporting zones is reduced, the bearing capacity increases by 50-60% compared to similar beams without a profile

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.

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