scholarly journals The FRP and TRC strengthening of the masonry structures

2019 ◽  
Vol 97 ◽  
pp. 02041
Author(s):  
Arkady Granovsky ◽  
Oleg Simakov ◽  
Bulat Dzhamuev
Keyword(s):  
Cross Section ◽  
Carbon Fibers ◽  
Ultimate Load ◽  
Experimental Studies ◽  
Masonry Structures ◽  
Test Results ◽  
Load Bearing Capacity ◽  
Site Specific ◽  
Section Size ◽  
External Reinforcement

The use of external reinforcement based on carbon fibers is technically and economically justified to strengthen concrete structures, which is confirmed by years of experience. The use of this method of reinforcement for masonry structures has significantly less history and, accordingly, experience. However, experimental and site specific efficacy of the use of external reinforcement in the amplification of the pillars of masonry by the device holder has been proven. The experiments of strengthening of a brickwork carried out earlier, as well as the developed theory of calculation, concern application of a full-bodied brick. Given the volume of construction of large-format ceramic stone, the task of strengthening structures from it becomes more urgent every year. In order to solve this problem, the present experimental studies were carried out – experimental studies of the clip effect on the fragments of brickwork with the strengthening of the external reinforcement system based on carbon fibers. In addition to studies of the influence of the size of bricks and the presence of voids, there was a study of the possibility of strengthening the samples with a cross-section size ratio of more than 2. In this case, carbon through anchors were mounted in the Central part of the samples. The test results obtained characters of destruction of specimens, the ultimate load-bearing capacity, made the appropriate conclusions.

Shear Behavior Of Anchors On The Basis Of Carbon Fiber At External Reinforcement

2019 ◽  
pp. 59-64
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Carbon Fibers ◽  
Experimental Studies ◽  
Shear Forces ◽  
External Reinforcement ◽  
Concrete Body ◽  
Improve Calculation ◽  
Analysis Of Results ◽  
The Impact

In systems of external reinforcement on the basis of carbon fibers used for strengthening concrete structures, special attention should be paid to the anchoring of carbon reinforcement elements. Taking into account their installation in the external reinforcement system in the reinforced structure, the anchoring elements can work on the shear. At the same time, the nature of such operatioj as a whole is insufficiently studied, which raises many questions both about their calculation and their design. In order to improve calculation and design methods of carbon anchors, special experimental studies of the parameters of anchors and their impact on the bearing capacity of the anchor fastening were carried out. These studies relate to the length of the anchorage in the concrete body, maximum shear forces, ultimate deformations of the anchor etc. According to the results of the experiments conducted, the analysis of results obtained was performed, in particular, various schemes of destruction of anchors were analyzed and the impact of the depth of the anchor, its diameter of the anchor, as well as the type of binder on the degree of theirdestruction were studied.

scholarly journals Determination of the load-bearing capacity of «steel-wood» connections of LVL structures under tension

2021 ◽  
Vol 18 (1) ◽  
pp. 60-69
Author(s):  
Quoc Phong Tran ◽  
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Steel Plate ◽  
Experimental Studies ◽  
Steel Plates ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Dowel Connections ◽  
Wooden Structures

The article presents the results of calculation of the load-bearing capacity of connections of LVL structures under tension using cylindrical dowels in trusses and frames. The description of calculation schemes for determining the load-bearing capacity of connections with different location and sizes of steel plates in the connection is given. The influence of steel plate placement on the distribution of forces in the cross-section of samples is investigated. Based on the results of analytical and experimental studies, the load-bearing capacity of dowels during bending is considered, as well as the mechanism of wooden structures` fracture during chipping. A comparative analysis of the effectiveness of different schemes of dowel connections with three steel plates under tension is carried out.

The Corner Radius Influence on the Deformation Behavior of Brick Pillars Strengthened by CFRP Confinement

2015 ◽  
Vol 1122 ◽  
pp. 273-277
Author(s):  
Jan Kubat ◽  
Jiří Karas
Keyword(s):  
Carbon Fibers ◽  
Deformation Behavior ◽  
Ultimate Load ◽  
Compressive Loading ◽  
High Strength ◽  
Resin Matrix ◽  
Transverse Reinforcement ◽  
Load Bearing Capacity ◽  
Stress States ◽  
Cfrp Confinement

The article addresses the issues of the application of materials based on high-strength carbon fibers as external glued transverse confinement of concentrically compressed masonry pillars. Transverse confinement of compressed pillars contributes to their enhanced load-bearing capacity and ductility due to the introduction of horizontal forces and creation of multi-axial compressive loading of masonry.The article describes experimental research within the NAKI, DF12P01OVV037 research project. The research was carried out on a set of brick pillars with dimensions of 286 x 286 x 870 mm, reinforced by confinement in carbon fibers in an epoxy resin matrix. The corner edges of brick pillars were treated by rounding with radii of 20 mm, 35 mm, 50 mm and 85 mm. To conclude, the article compares differently treated pillars in terms of the ultimate load reached, the deformation behavior, stress states in the transverse reinforcement, the pillars’ failure mode and the crack pattern along the cross section. Based on the comparison, some findings are formulated.

scholarly journals An innovation for flat traditional conventional footing

2021 ◽  
Vol 23 (07) ◽  
pp. 358-364
Author(s):  
Aakriti Sharma ◽  
◽  
Dr. Prashant Garg ◽  
Amandeep Singh ◽  
◽  
...  
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Experimental Studies ◽  
Failure Surface ◽  
Good Method ◽  
Test Results ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Shell Foundation ◽  
Shell Foundations

Since their inception in the 1950s, shell foundations have grown in popularity over regular ones. In this paper, the ultimate load capacities of shell foundations on clay were determined by Numerical model tests. The results were compared with those for flat foundations with the same base. The model test results were found using finite element analysis using the program PLAXIS 2D. The experimental studies indicated that the ultimate load capacity of shell footing on clay is higher than that on flat-footing and the load settlement curves were significantly modified. The shell foundation over clay can be considered a good method to decrease the resulting settlement and material consumption at different thicknesses. Also, the rupture surface of the shell upright and inverted system was significantly deeper than both normal footings. The numerical analysis helps in understanding the deformation behavior of the studied systems and identifies the failure surface of upright and inverted shell footing.

Calculation Of Carbon Fiber Anchors For Pull-Out And Shear When Installing External Reinforcement Systems

2020 ◽  
pp. 4-8
Keyword(s):  
Composite Materials ◽  
Carbon Fibers ◽  
Experimental Studies ◽  
The Body ◽  
Carbon Fibres ◽  
Calculation Methods ◽  
Regulatory Documents ◽  
Pull Out ◽  
External Reinforcement ◽  
Concrete Elements

The operation of external reinforcement systems based on carbon fibers when strengthening normal and inclined sections of bending reinforced concrete elements depends largely on the anchoring to the body of the reinforced structure. In addition to adhesion, one of the options for ensuring the required level of anchoring of external reinforcement is the installation of anchoring elements, including those based on carbon fibers. This article discusses the calculation of anchors based on carbon fibres used in the arrangement of the external reinforcement system. Two principles of anchor arrangement operation are highlighted: for shear and for pull-out. Separate design provisions have been developed for each, taking into account the parameters of anchoring elements and the nature of the destruction obtained during experimental studies. The proposed calculation methods are based on experimental studies of both bending elements reinforced by external reinforcement systems and directly anchoring elements. In addition, the development of these methods takes into account the provisions available in the regulatory documents on the calculation of anchors and composite materials.

STRENGTH OF CLT PANELS BY SHEAR AND TORSION

2020 ◽  
pp. 315-322
Author(s):  
Andrii Bidakov ◽  
◽  
Oksana Pustovoitova ◽  
Ievgenii Raspopov ◽  
Bogdan Strashko ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Experimental Studies ◽  
Load Bearing Capacity ◽  
Rolling Shear ◽  
Torsional Strength ◽  
Load Bearing ◽  
Factors Of Influence ◽  
Main Factors ◽  
The Cross

Urgency of the research. Positive experience with the use of CLT panels in distress has been observed for a long time in Eastern Europe and is considered necessary to study the strength and factors affecting the load-bearing capacity of this type of structures made of transverse glued wood (CLT). Target setting. An integral important issue for CLT panels is torsional strength, which has a scheme of destruction by chipping layers of boards and requires the establishment of the main factors of influence to assess the load-bearing capacity of this type of stress. Actual scientific researches and issues analysis. Shear and torsional strength is one of the main issues in the strength of CLT panels as an orthotropic plate, which has interested many researchers from different countries, including Blaß, Görlacher (2002) [1], Bosl (2002) [4], Jeitler (2004) [11 ], Jöbstl, Bogensperger, Schieckhofer [12], Wallner (2004) [18], Bogensperger, Moosbrugger (2007) [3], Silly (2010) [14, 15], Hirschmann (2011), Blaß, Flaig (2012) [2], Dröscher, Brandner, Kreuzinger, Sieder (2013), Dietsch (2017), Serrano (2018). Uninvestigated parts of general matters defining. The issue of identifying factors influencing the bearing capacity of PKD panels during shear and torsion has not been resolved.. The purpose of the article. Establishment of the main factors of influence for an estimation of bearing capacity of CLT of panels at shift and torsion.. The presentation of the main material. Cross laminated timber, as a sheet building material based on layers of boards with mutually perpendicular arrangement of boards in adjacent layers, has a number of important factors that affect the strength of CLT panels in shear and torsion. Thirty years of world experience in the use of CLT panels in multi-storey construction proves the importance of considering different models of panels as diaphragms and rigid frame elements from panel-frame buildings. Particular attention is paid to the nature of the destruction of the panel for chipping, both in the plane of the panel and from the plane. The importance of this type of stress state is further enhanced by a group of different shear or group of test schemes according to EN16351, including rolling shear strength tests. The latter value of strength is a new phenomenological feature of CLT panels. Conclusions and suggestion. Based on experimental studies of the strength of the glued rods in the cross section of CLT panel, the change in strength depending on the diameter of the metal rod and its location in the cross section, which is characterized by alternation of mutually transverse layers of boards.

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

Work on the pull-out of anchors based on carbon fibers when arranging external reinforcement systems

2019 ◽  
pp. 29-34
Keyword(s):  
Carbon Fibers ◽  
Experimental Studies ◽  
Breaking Load ◽  
The Body ◽  
Pull Out ◽  
External Reinforcement ◽  
Concrete Body ◽  
The Moment ◽  
Two Stages ◽  
The Impact

Reliable anchoring of carbon reinforcement elements into the body of the structure is one of the most important aspects when designing the strengthening of reinforced concrete structures with the system of external reinforcement based on composite materials. The use of carbon fiber anchoring elements in this case is confirmed by numerous tests, but there are no methodological provisions for the calculation and design of these anchors at the moment. Special experimental studies of the parameters of anchors and their effect on the bearing capacity of the anchorage have been conducted for this purpose. The tests were carried out in two stages, during the experiments the breaking load, the size of the concrete pull-out cone, as well as the nature of the destruction of the anchor were recorded. In addition, the length of the anchorage in the concrete body, the pull-out forces, the maximum deformations of the anchor and the length of the anchorage when introducing the anchor fibers in the external reinforcement system have been defined. According to the results of the experiments, the analysis of the results, in particular, various schemes of destruction of anchors and the impact of the depth of the anchor on them, its diameter, as well as the type of binders was carried out.

Experimental Research on the Strengthening of RC Columns by High Performance Ferrocement Laminates

2011 ◽  
Vol 243-249 ◽  
pp. 1409-1415 ◽  
Author(s):  
Long Min Jiang ◽  
Fan Hua Tang ◽  
Man Li Ou
Keyword(s):  
Bearing Capacity ◽  
High Performance ◽  
Ultimate Load ◽  
Strengthening Effect ◽  
Test Results ◽  
Load Bearing Capacity ◽  
Rc Columns ◽  
Cracking Behavior ◽  
Load Bearing ◽  
Better Than

Eleven approximate full-size specimens including nine eccentrically compressed columns of monotonic loading and two axially compressed columns of laterally cyclic loading were tested. By a series of comparison experiment of specimens strengthened by high performance ferrocement laminates (HPFL) and no strengthened specimens, it was found that the RC columns strengthened with attached HPFL demonstrated greater degree of improving in load-bearing capacity, in which the carrying capacity increment of the strengthened eccentrically compressed columns with lesser eccentricity was greater than that of the same type of columns with bigger eccentricity under the same strengthening conditions; the strengthening effects of the specimens with lower concrete grade are better than that of those ones with higher concrete grade; the ductility and energy dissipation ability of the strengthened columns were remarkably increased. In this paper, the test results is described, the principle and regularity that this category of strengthening laminate improved the ultimate load-bearing capacity, ductility, cracking behavior and mode of failure etc. of the RC columns are analyzed. The studying results proved that this strengthening measure for RC columns is superior to make the strengthening effect notable, working behavior of strengthened column excellent, strengthening construction easy and economical.

Concrete Reinforced by Glass-Fibre Mesh and Their Efficient Usage in Plated Façade Components Stiffened by Rib

2013 ◽  
Vol 743 ◽  
pp. 67-72 ◽  
Author(s):  
Marcela Karmazínová
Keyword(s):  
Glass Fibre ◽  
Ultimate Load ◽  
Test Results ◽  
Load Bearing Capacity ◽  
Geometrical Characteristics ◽  
Actual Behaviour ◽  
Fibre Concrete ◽  
Strain Mechanism ◽  
Loading Tests ◽  
Fibre Mesh

The paper deals with the problems of the actual behaviour of glass-fibre-concrete (GFC) facade components stiffened by the rib. The results of loading tests of GFC plated panels subjected to the load simulating the effects of the wind pressuring or sucking are especially presented in the paper. Loading tests were oriented to the investigation of the actual behaviour of GFC component in the loading progress up to the failure, in particular with the accent to monitoring the strain mechanism in the loading process and subsequent the failure mechanism at reaching the ultimate load-bearing capacity. The particular test results in the form of the objective ultimate capacities obtained as the maximal loads at the failure give the important information on the properties of the plated facade panel composed of glass-fibre-concrete produced by the “splashing” method, namely in the relation to the physical-mechanical properties of the material and to the geometrical characteristics of the panel cross-section.

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