scholarly journals An Experimental Research on Connection of Boundary Concrete Filled Steel Tube Columns and Reinforced Concrete Slab

2019 ◽  
Vol 9 (2) ◽  
pp. 3525-3531
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Steel Tube ◽  
Reinforced Concrete Frame ◽  
Reinforced Concrete Slab ◽  
Flat Slab ◽  
Concrete Filled Steel Tube ◽  
Rc Slab ◽  
Cfst Columns

A combination of outstanding advantages of concrete filled steel tube (CFST) column with reinforced concrete (RC) flat slab creates the effective and potential structure to replace traditional reinforced concrete frame structures in high-rise buildings. The CFST column – RC slab connection is the key factor for this structure type to work properly and effectively. Currently, the studies mainly focus on inner CFST column and RC slab connection, there are very few experimental studies on connection of edge or corner CFST columns and RC flat slab. This paper proposes edge and corner CFST columns to RC flat slab connection structures using H-shaped shear head and then conducts two large size tests to investigate behaviors of the connection.

scholarly journals Connection of Reinforced Concrete Flat Slab and Concrete Filled Steel Tube Column: Proposed Structures, Experiment, Simulation and an Analytical Prediction Model for Shear Strength

2019 ◽  
Vol 9 (2) ◽  
pp. 779-786
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Prediction Model ◽  
Structure Type ◽  
Steel Tube ◽  
Shear Capacity ◽  
Analytical Prediction ◽  
Flat Slab ◽  
Concrete Filled Steel Tube ◽  
Rc Slab

Concrete filled steel tube column (CFST) combined with reinforced concrete (RC) flat slab provides potential structural solution to replace the traditional structures in high-rise buildings. The CFST column – RC slab connection is the key factor for this structure type to work effectively. This paper proposes an improved structure for connection of concrete filled steel tube column and reinforced concrete flat slabs using steel plate shear-head. The experiments of two large-sized specimens are performed to assess the capacity and reliability of the proposed connection. Numerical simulation using Abaqus is also performed to validate the test results. Based on experimental and numerical simulation results, an analytical prediction model to estimate the punching shear capacity of the flat slab is presented.

scholarly journals Operation of a steel-concrete composite beam considering slab cracking

2014 ◽  
Vol 13 (2) ◽  
pp. 265-274
Author(s):  
Marek Łagoda ◽  
Krzysztof Śledziewski
Keyword(s):  
Reinforced Concrete ◽  
Composite Beam ◽  
Composite Structures ◽  
Current Practice ◽  
Concrete Slab ◽  
Experimental Studies ◽  
The State ◽  
Reinforced Concrete Slab ◽  
Continuous Beams ◽  
Indeterminate Structures

The theme of the paper is the effect of scratching of reinforced concrete slab on the work of a steel-concrete composite beam. The paper evaluates the state of knowledge in the field of composite structures, in particular, statically indeterminate structures with concrete in tension zones. Additionally, in a nutshell, it describes the current practice of design. Moreover, experimental studies were described on continuous beams that were made by the authors. A proposal for further work on this topic was also presented.

Effect of Column Dimensions on the Punching Shear of Flat Slab

2019 ◽  
pp. 378-393
Author(s):  
Hamid Abdulmahdi Faris ◽  
Lubna Mohammed Abd
Keyword(s):  
Reinforced Concrete ◽  
Shear Failure ◽  
Concrete Slab ◽  
The Other ◽  
Punching Shear ◽  
Concrete Slabs ◽  
Reinforced Concrete Slab ◽  
Flat Slab ◽  
Interior Edge ◽  
Reinforced Concrete Slabs

The "flat slab" is a reinforced concrete slab bolstered, by a number of columns. Punching, shear is a category for collapse for reinforced concrete slabs exposed to great confined forces. In "flat slab" constructions the shear failure happens, at column bolster joints. To avoid this, collapse two methods are used, first method is increasing the column dimensions and, the other is to use drop panel if the first method leads to uneconomical, design. Two examples are used to find the effect, of column dimensions, increase on the punching shear failure of "flat slab". The first example, is a "flat slab" of span (5 by 5) m and the other is of span (6 by 6) m. The column which examined is the interior, edge and corner columns, and the interior column is the most dangerous case. It is concluded that, the increase of column dimensions are lead to avoid of punching shear failure in "flat slab" and the drop panel is enlarge the area of the critical shear perimeter and this avoiding punching shear failure.

scholarly journals Ultrasonic pitch and catch technique for non-destructive testing of reinforced concrete slabs

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Wael A. Zatar ◽  
Hai D. Nguyen ◽  
Hien M. Nghiem
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Point Contact ◽  
Test Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs ◽  
Rc Slab ◽  
Non Destructive

Abstract This study aims at evaluating reinforced concrete (RC) bridge elements using ultrasonic pitch and catch (UPC) non-destructive testing (NDT) technique. A validation reinforced concrete slab with two embedded layers of rebars and artificial defects (voids, honeycombs, and debondings) was designed and tested. A commercial UPC NDT device (hereafter called “UPC device”), which is based on the ultrasonic shear-wave test method using dry-point-contact transmitting and receiving transducers in a “pitch-catch” configuration, was used to map internal defects of the validation RC slab. The recorded data from the UPC device was analyzed using a modified synthetic aperture focusing technique (SAFT). A software was developed to reconstruct 2-D images of the RC slab cross-sections using novel signal filtering and processing techniques. The results revealed that the 2-D image reconstructed from the developed software accurately exhibited locations and horizontal dimensions of the steel rebars, voids, and debondings. In addition, the developed software was capable to provide much higher resolution and sharper images of the anomalies inside the RC slab compared to the UPC device’s proprietary imaging software.

Behavior of Two-way RC Slabs Combination Strengthened with CFRP Strips and Steel Sheets

2014 ◽  
Vol 501-504 ◽  
pp. 1048-1052 ◽  
Author(s):  
Xiao Jin Li ◽  
Yi Yan Lu ◽  
Na Li
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Concrete Slabs ◽  
Test Results ◽  
Reinforced Concrete Slab ◽  
Steel Sheets ◽  
Reinforced Concrete Slabs ◽  
Rc Slab ◽  
Rc Slabs ◽  
Strengthening Technique

A total of four two-way reinforced concrete slabs strengthened with three methods were tested. The four test specimens were one unstrengthened reinforced concrete slab (control), one slab strengthened with CFRP strips, one slab strengthened with steel sheets, and one slab strengthened with an innovative method of applying CFRP strips and steel sheets combination bonding to the tension face of the slab. The test results show the CFRP-Steel combination strengthened technique is a rapid and effective strengthening technique for two-way RC slab. The increase in ultimate capacities of CFRP-Steel combination strengthened slab is 221.1% over the control slab, 84.4% over the CFRP-strengthened slab, and 45.2% over the steel-strengthened slab. In addition, the CFRP-Steel combination strengthened slab exhibited superior ductility than the CFRP-strengthened slab.

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 MODELING THE WORK OF THE STRUCTURE STRENGTHENING STRUCTURE STRUCTURE BY THE METHOD OF CONNECTING A FOUNDATION BOARD WITH A REMOVABLE FORMWORK IN A TRAY

2020 ◽  
Vol 8 (1) ◽  
pp. 39-47
Author(s):  
Vitaliy Subbotin
Keyword(s):  
Reinforced Concrete ◽  
Similarity Theory ◽  
Concrete Slab ◽  
Experimental Studies ◽  
Optimal Conditions ◽  
Injection Wells ◽  
Reinforced Concrete Slab ◽  
Structural Reinforcement ◽  
Working Together ◽  
Reinforcement Design

The conditions of creating a model for conducting experimental studies in a tray of a patented reinforcement design of existing strip foundations are considered. It is proposed to simulate and investigate the effectiveness of the new design of reinforcement of the strip foundation, allowing to take into account the rheological processes in the soil of the base when performing measures for structural reinforcement using a profiled sheet in conjunction with monolithic elements. Based on the rules of modeling and similarity theory, it is proposed to determine the optimal conditions for experimental modeling of a solution to strengthen existing monolithic reinforced concrete strip foundations by working together with a monolithic reinforced concrete slab divided by a profiled sheet in height into two parts (upper and lower) with injection wells for injection of a hardening mortar directly under fixed formwork from a profiled sheet

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