Study on Seismic Behavior of Vertical Connection in Prefabricated Reinforced Concrete Structures

2011 ◽  
Vol 250-253 ◽  
pp. 1385-1394
Author(s):  
Guo Hua Song ◽  
Dong Wei Wang ◽  
Bing Kang Liu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Concrete Structures ◽  
Shear Resistance ◽  
Repeated Loading ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Dowel Action ◽  
Cycle Loading ◽  
Good Agreement

The paper attempts to research the seismic behavior and mechanical mechanisms under repeated low-cycle loading of vertical connections in prefabricated reinforced concrete structures. Eighteen specimens were designed and tested, the test process and the mechanical mechanisms are studied, the seismic behavior of connections is analyzed, and the shear resistance formulas are proposed. The theoretical values based on proposed formulas are good agreement with test results. Under repeated loading, the shear resistance decreases, the connection ductility increases with connecting bar, but decreases with connection width. However, all the connections fail crisply with poor ductility. At sudden-cracking, the shear resistance increases with connecting bar, but changes nonlinearly with connection width. The resistance is composed of attributions of mechanism of diagonal-compressive column (MDCC) and mechanism of compressive friction action (MCFA). After sudden-cracking, the shear resistance is provided by weakened MDCC and dowel action of connecting bars (DACB). It increases with connecting bar and connection width.

scholarly journals The Mechanical Properties of Centrifuged Concrete in Reinforced Concrete Structures

2020 ◽  
Vol 10 (10) ◽  
pp. 3570
Author(s):  
Romualdas Kliukas ◽  
Ona Lukoševičienė ◽  
Arūnas Jaras ◽  
Bronius Jonaitis
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Concrete Strength ◽  
Concrete Structures ◽  
High Strength ◽  
Reinforcement Ratio ◽  
Transverse Reinforcement ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Moduli Of Elasticity

This article explores the influence of transverse reinforcement (spiral) and high-strength longitudinal reinforcements on the physical-mechanical properties of centrifuged annular cross-section elements of concrete. The test results of almost 200 reinforced, and over 100 control elements are summarizing in this article. The longitudinal reinforcement ratio of samples produced in the laboratory and factory varied from 1.0% to 6.0%; the transverse reinforcement ratio varied from 0.25% to 1.25%; the pitch of spirals varied from 100 mm to 40 mm and the concrete strength varied from 25 MPa to 60 MPa. Experimental relationships of coefficients for concrete strength, moduli of elasticity and limits of the longitudinal strain of centrifuged concrete in reinforced concrete structures in short-term concentrically compression were proposed.

scholarly journals Contribution to the damage modelling of reinforced concrete structures

2018 ◽  
Vol 149 ◽  
pp. 01052
Author(s):  
Mourad KHEBIZI ◽  
Hamza GUENFOUD ◽  
Mohamed GUENNFOUD
Keyword(s):  
Reinforced Concrete ◽  
Numerical Models ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Nonlinear Behaviour ◽  
Cracked Concrete ◽  
Finite Elements Modeling ◽  
Linear Behaviour ◽  
Cyclical Loading ◽  
Good Agreement

A two-dimensional multi-layered finite elements modeling of reinforced concrete structures at nonlinear behaviour under monotonic and cyclical loading is presented. The non-linearity material is characterized by several phenomena such as: the physical non-linearity of the concrete and steels materials, the behaviour of cracked concrete and the interaction effect between materials represented by the post-cracking field. These parameters are taken into consideration in this paper to examine the response of the reinforced concrete structures at the non-linear behaviour. Two examples of application are presented. The numerical results obtained, are in a very good agreement with available experimental data and other numerical models of the literature.

Magnetoelastic Measurements of Steel Stress under Uniaxial Loading

2006 ◽  
Vol 321-323 ◽  
pp. 377-380 ◽  
Author(s):  
Hong C. Rhim ◽  
Bo Hwan Oh ◽  
Hyo Seon Park
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Uniaxial Loading ◽  
Magnetic Response ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Traditional Technique ◽  
Steel Bar ◽  
Steel Bars ◽  
Different Diameters

An attempt has been made to measure existing steel stress using magnetoelasticity. A device has been developed and used for the measurement of magnetism in response to the deformation of a steel bar. The proposed technique can be used for the assessment of existing reinforced concrete structures by the measurements of steel stress embedded inside concrete. A traditional technique requires to break the existing steel bar to measure existing strain. However, the proposed technique is developed to measure the stress without damaging the steel bar. A successful application of magnetoelasticity depends on the establishment of relationship between elastic and magnetic response due to loading. To investigate the correlation between the two, steel bars are loaded in tension under uniaxial loading while the magnetic reading is recorded. Based on the test results, equations are suggested to predict stress for steel bars with different diameters.

scholarly journals DEFLECTION OF FLEXURAL REINFORCED CONCRETE STRUCTURES WITH EXTERNAL NON-METALLIC REINFORCEMENT (EXPERIMENTAL AND THEORETICAL INVESTIGATION)

2002 ◽  
Vol 8 (3) ◽  
pp. 164-168
Author(s):  
Juozas Valivonis
Keyword(s):  
Reinforced Concrete ◽  
Theoretical Investigation ◽  
Concrete Beams ◽  
Theoretical Calculations ◽  
Concrete Structures ◽  
Reinforced Concrete Beams ◽  
Experimental Investigations ◽  
Reinforced Concrete Structures ◽  
Metallic Reinforcement ◽  
Good Agreement

In many cases concrete structures with prestressed steel being sufficiently strong do not meet requirements for stiffness. It is possible to avoid steel prestressing in concrete structures by means of providing additional non-metallic reinforcement, which gives opportunity to increase stiffness of beams significantly. Experimental investigations of reinforced concrete beams with external non-metallic reinforcement were made. Method for calculation of deflection of beams with external non-metallic reinforcement is presented in this article. Theoretical calculations of deflections using the proposed method were performed. Sufficiently good agreement with experimental deflection values was obtained.

scholarly journals CALCULATION SCHEME OF REINFORCED CONCRETE STRUCTURES OF CIRCULAR CROSS-SECTION UNDER BENDING WITH TORSION

2021 ◽  
Vol 17 (3) ◽  
pp. 63-82
Author(s):  
Vladimir Kolchunov ◽  
Sergey Bulkin
Keyword(s):  
Reinforced Concrete ◽  
Cross Sections ◽  
Concrete Structures ◽  
Circular Cross Section ◽  
Shear Stresses ◽  
Reinforced Concrete Structures ◽  
Dowel Action ◽  
The Moment ◽  
External Forces ◽  
Spatial Section

The developed design diagram of the ultimate resistance of reinforced concrete structures in bending with torsion of circular cross-sections most fully reflects the features of their actual exploitation. For a spatial crack of a diagonal large ellipse, sections are taken in the form of a swirling propeller with concave and convex spatial parabolas from the first and second blocks between vertical transverse circular sections from the beginning to the end of the crack. For practical calculations in compressed and tensioned concrete, a polyline section of three sections is considered: two longitudinal trapezoids and the third middle section of the radius curve of a small ellipse close to forty-five degrees. When calculating unknown forces, solutions of the equations of equilibrium and deformations of the sections are made up to the end of the crack passing through the moment points for the resultant moments and the projections of internal and external forces. Shear torsional stresses along the linear longitudinal sections of the trapezoid were presented, as well as normal and shear stresses located on the end cross-sections at a distance x from the support. The height of the compressed area of concrete decreases with an increase in bending moments in the spatial section between the first and third cross-sections. It is found in their relationships and connections. The dowel action of reinforcement is determined using a special model of the second level with discrete constants. The static loading scheme was considered from the standpoint of an additional proportional relationship between the torques along the length of the bar in the spatial section and the first and third transverse sections. For a dangerous spatial crack, when projected onto the horizontal axis, the length C was found from a diagonal large ellipse of a round bar.

Response of R/C Buildings during the 1987 Whittier Narrows Earthquake

1993 ◽  
Vol 9 (1) ◽  
pp. 67-95 ◽  
Author(s):  
Emmanuel Maragakis ◽  
Mehdi Saiidi ◽  
Saber Abdel-Ghaffar
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Strong Motion ◽  
Elastic Response ◽  
Reinforced Concrete Structures ◽  
Structural Members ◽  
Linear Elastic ◽  
Observed Damage ◽  
Comparison Of The Results ◽  
Good Agreement

Strong motion records from several reinforced concrete structures were recovered after the 1987 Whittier, California earthquake. The objective of this paper is to present the highlights of a research study which was performed to review the available data from reinforced concrete buildings, to select representative buildings, and to analyze these buildings using available computer programs for linear analysis. Linear-elastic mathematical models were built for each structure based on the physical properties of the structural members. A comparison of the results of the computer analysis to the available measured responses data showed good agreement for the majority of the buildings studied. Limited studies on the effects of damping variation and soil-structure interaction were performed. The results of this study have led to the conclusion that the linear dynamic analysis can realistically predict the response of reinforced concrete structures subjected to small to moderate earthquakes. The deviations from the elastic response were consistent with the observed damage of the structures during the Whittier earthquake.

scholarly journals Seismic resistant joints for reinforced concrete structures

1981 ◽  
Vol 14 (3) ◽  
pp. 145-159 ◽  
Author(s):  
R. C. Fenwick
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Shear Resistance ◽  
Structural Member ◽  
Bond Stress ◽  
Reinforced Concrete Structures ◽  
Joint Zone ◽  
Seismic Resistant ◽  
Two Factors

The theory of shear resistance of beam column joints is described and the results of two tests on beam column units
in which bond plates were used in the joints are presented. Potential advantages for the use of this form of construction arise from the reduction in reinforcement congestion in the joint zone and the elimination of bond stress limitations
on beam reinforcement passing through interior joints. These two factors in some situations allow structural member sizes to be reduced, and simpler reinforcement arrangements to be used as bar sizes are not restricted. A number of tentative recommendations are made for the design of this form of joint.

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