Reinforcement Possibilities of Round Timber Bolted Joints

2014 ◽  
Vol 1082 ◽  
pp. 359-364
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Tensile Strength ◽  
Civil Engineering ◽  
Bolted Joints ◽  
Steel Plates ◽  
Mechanical Reinforcement ◽  
With Screws ◽  
Test Result ◽  
Round Timber ◽  
Rate Of Improvement

In this article the results of round timber bolted joints with inserted steel plates tests are presented. First, unreinforced round timber specimens were tested. Mechanical reinforcement by using modified washers, steel bands, BOVA plates and boost with screws of round timber specimens based on test result was then proposed. Reinforced specimens of various densities were then tested and rate of improvement in tensile strength was established for each of five proposed reinforcement methods. Tests were carried out on EU100 pressure machine in Faculty of Civil Engineering of VŠB-TUO Ostrava.

Round Timber Bolted Joints with Mechanical Reinforcement

2013 ◽  
Vol 838-841 ◽  
pp. 629-633 ◽  
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Tensile Strength ◽  
Civil Engineering ◽  
Bolted Joints ◽  
Steel Plates ◽  
Mechanical Reinforcement ◽  
Static Tests ◽  
Timber Joints ◽  
With Screws ◽  
Round Timber ◽  
Rate Of Improvement

This paper presents the results of static tests of round timber bolted joints with inserted steel plates. All round timber joints static tests in tension were carried out on pressure machine EU 100 in laboratory of the Faculty of Civil Engineering VŠB-TU Ostrava. At first, timber specimens were tested without reinforcement. Based on these results, mechanical reinforcement methods were proposed: using modified washers and boost with screws. These samples were also tested. Rate of improvement in tensile strength was established for used reinforcement method.

Round Timber Bolted Joints Reinforcement Methods

2014 ◽  
Vol 1020 ◽  
pp. 351-355 ◽  
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Bolted Joints ◽  
Steel Plates ◽  
Bolted Joint ◽  
New Approach ◽  
Static Tests ◽  
Tension Tests ◽  
Tension Testing ◽  
With Screws ◽  
Round Timber ◽  
Rate Of Improvement

This paper presents the results of static tests of non-reinforced and reinforced round timber bolted joints with slotted-in steel plates. In this article, a new approach to the reinforcement of round timber bolted joints is presented. Based on results from tension tests of timber bolted joint samples, reinforcement methods were proposed. From these, modified washers and boost with screws were chosen for further tension testing. Results were compared to unreinforced ones and rate of improvement established.

Reinforced Round Timber Joints under Static and Cyclic Loading

2014 ◽  
Vol 893 ◽  
pp. 702-706 ◽  
Author(s):  
Antonín Lokaj ◽  
Kristýna Klajmonová ◽  
Vit Křivý
Keyword(s):  
Fatigue Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Mechanical Reinforcement ◽  
Static Tests ◽  
Timber Joints ◽  
Static And Cyclic Loading ◽  
With Screws ◽  
Round Timber ◽  
Made In

Aim of this article is in presentation of results of static and cyclic tests of round timber bolted joints with inserted steel plates. At first, timber specimens were tested without reinforcement. Based on static tests results, mechanical reinforcement methods were proposed and tested: using modified washers and boost with screws. Rate of improvement in tensile strength was established for used reinforcement method. Static tests in tension were carried out on pressure machine EU 100 in laboratory of the Faculty of Civil Engineering VŠB-TU Ostrava. Round timber joints multi cyclical dynamic (fatigue) tests in tension were made in laboratory of ITAM AS CR Prague and in TRI Žilina.

Impact Fracture of Jointed Steel Plates of Bolted Joint of Cars

2014 ◽  
Vol 566 ◽  
pp. 232-237
Author(s):  
H. Ambarita ◽  
M. Daimaruya ◽  
H. Fujiki
Keyword(s):  
Tensile Strength ◽  
Shear Test ◽  
Fracture Criterion ◽  
Shear Fracture ◽  
Impact Fracture ◽  
Bolted Joints ◽  
Steel Plates ◽  
Bolted Joint ◽  
Car Body ◽  
The Impact

The present study is concerned with the development of a fracture criterion for the impact fracture of jointed steel plates of a lap bolted joint used in the suspension parts of a car body. For the accurate prediction of crash characteristics of car bodies by computer-aided engineering (CAE), it is also necessary to examine the behaviour and fracture of the jointed steel plates subjected to impact loads. Although the actual impact fracture of jointed steel plates of a lap bolted joint in cars is complicated, for simplifying it is classified into the shear fracture and the extractive fracture of jointed steel plates. Three kinds of steel plates, i.e., common steel with the tensile strength of 270 MPa and two high tensile strength steels with the tensile strength of 440 and 590 MPa level used for vehicles, are examined. In the impact shear test, the specimens are made of two plates and jointed by a bolt, and in the impact extractive test the specimens are made of a plate and drilled in the centre for a bolt. The impact shear test of jointed steel plates of lap bolted joints is performed using a modified split Hopkinson bar apparatus, while the impact extractive one is performed using one-bar method. Numerical simulations by a FEM code LS-DYNA are also carried out in order to understand the mechanism of shearing and extractive fractures process of jointed steel plates. The obtained results suggest that a stress-based fracture criterion may be developed for the impact shearing and extractive fractures of jointed steel plates of lap bolted joints used in a car body.

scholarly journals Carrying Capacity of Round Timber Bolted Joints with Steel Plates Under Static Loading / Únosnost Svorníkových Spojů Kulatiny S Vloženými Ocelovými Plechy Při Jednorázovém Statickém Namáhání

2012 ◽  
Vol 12 (2) ◽  
pp. 100-105 ◽  
Author(s):  
Antonín Lokaj ◽  
Kristýna Klajmonová
Keyword(s):  
Carrying Capacity ◽  
Static Loading ◽  
Laboratory Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Bolted Connections ◽  
Static Tests ◽  
Deformation Response ◽  
Timber Connections ◽  
Round Timber

Abstract Aim of this article is in presentation of results of static tests of round timber bolted connections with steel plates. Round timber connections tests in tension were made on pressure machine EU100 in laboratory of the Faculty of Civil Engineering VSB-TU Ostrava. Results of laboratory tests have been statistically evaluated and completed by graphical records of deformation response on loading.

Reinforced Round Timber Bolted Joints under Cyclic Loading

2014 ◽  
Vol 1020 ◽  
pp. 199-203
Author(s):  
Antonín Lokaj ◽  
Kristýna Klajmonová
Keyword(s):  
Cyclic Loading ◽  
Carrying Capacity ◽  
Laboratory Tests ◽  
Fatigue Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Dynamic Tests ◽  
Bolted Connections ◽  
Timber Joints ◽  
Round Timber

Aim of this article is in presentation of results of dynamic tests of reinforced round timber bolted connections with slotted – in steel plates. Multicyclic dynamic (fatigue) tests in tension were made with round timber joints on pulsator. Results of laboratory tests have been statistically evaluated and completed with graphical records of carrying capacity of connections in tension corresponding to number of loading cycles.

Round Timber Joints under Tensile Loading Perpendicular to the Grain

2014 ◽  
Vol 1065-1069 ◽  
pp. 1327-1330
Author(s):  
Kristýna Klajmonová ◽  
Antonín Lokaj
Keyword(s):  
Bolted Joints ◽  
Steel Plates ◽  
Truss Structures ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Static Tests ◽  
Load Carrying ◽  
Calculated Load ◽  
Timber Joints ◽  
Round Timber

This paper presents the results of static tests of non-reinforced round timber bolted joints with slotted-in steel plates loaded perpendicular to the grain. This type of joints loading is particularly widespread in truss structures. Round timber test samples series were prepared to validate the behavior of a joint loaded in tension perpendicular to the grain. The joints samples were experimentally tested in the laboratory of the Faculty of Civil Engineering VŠB TU Ostrava. The test results were compared with the calculated load-carrying capacity of joints by Johansen’s yielding theory.

Carrying Capacity of Round Timber Bolted Joints with Steel Plates under Cyclic Loading

2013 ◽  
Vol 838-841 ◽  
pp. 634-638 ◽  
Author(s):  
Antonin Lokaj ◽  
Kristýna Klajmonová
Keyword(s):  
Cyclic Loading ◽  
Carrying Capacity ◽  
Laboratory Tests ◽  
Fatigue Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Dynamic Tests ◽  
Deformation Response ◽  
Timber Joints ◽  
Round Timber

Aim of this article is in presentation of results of dynamic tests of round timber bolted connections with slotted in steel plates. Multicyclic dynamic (fatigue) tests in tension were made with round timber joints on pulsator INSTRON in laboratory of ITAM CAS Prague. Results of laboratory tests have been statistically evaluated and completed with graphical records of deformation response to loading.

Round Timber Bolted Joints with Steel Plates under Static and Cyclic Loading

2014 ◽  
Vol 627 ◽  
pp. 29-32
Author(s):  
Antonín Lokaj
Keyword(s):  
Fatigue Tests ◽  
Bolted Joints ◽  
Steel Plates ◽  
Dynamic Tests ◽  
Static Tests ◽  
Deformation Response ◽  
Timber Joints ◽  
Static And Dynamic Tests ◽  
Static And Cyclic Loading ◽  
Round Timber

Aim of this paper is in presentation of results of static and dynamic tests of round timber bolted connections with slotted – in steel plates. Round timber joints static tests in tension were made on pressure machine. Round timber joints multicyclic (fatigue) tests in tension were made on pulsator. Results of laboratory tests have been statistically evaluated and completed by graphical records of deformation response on loading. Samples of round timber bolt connections with slotted - in steel plates were tested for carrying capacity and deformation of a single tension – up to the failure of connection.

scholarly journals Strength Attainment of Geopolymer Concrete with GGBS at Ambient Curing

2019 ◽  
Vol 9 (2S2) ◽  
pp. 56-59
Keyword(s):  
Tensile Strength ◽  
Ambient Temperature ◽  
Sodium Hydroxide ◽  
Cross Sections ◽  
Strength Properties ◽  
Industrial Wastes ◽  
Mix Design ◽  
Geopolymer Concrete ◽  
Ambient Curing ◽  
Test Result

Geopolymer concrete plays a major role in concrete industry by replacing cement and using the industrial wastes. In this study, the cement is completely replaced by GGBS and strength properties are analyzed. An M30 mix design is prepared and the specimens are cast and tested. For this, sodium hydroxide and sodium silicate are used as activator and its ratio is fixed as 1:2.5. Sodium hydroxide of 12 molarity, 550kg/m3 of GGBS is used in the study. Admixture La Hypercrete S25 (HTS code 38244090) is added in the mix by 1% of weight of GGBS to obtain the required workability. For compression study, cubes in 100 mm size are cast. Cylinders with 100mm dia and 200mm height are tested for splitting tensile strength and beam specimens of 500mm long and 100mm cross sections were cast for determining the flexure behaviour. The beams are subjected to ambient curing and tested at 3, 7, 14, 28 and 56 days. The test result shows that there is a gradual increment in all the strengths from 3 to 56 days and it proves that geopolymer concrete with GGBS cured at ambient temperature performs well in the strength properties.

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