scholarly journals EXPERIMENTAL LOAD TESTS OF REINFORCED CONCRETE SLAB

2016 ◽  
Vol 78 (5-5) ◽  
Author(s):  
Vojtech Buchta ◽  
Roman Fojtik ◽  
Jan Hurta
Keyword(s):  
Concrete Slab ◽  
Reinforced Concrete Slab ◽  
Design Models ◽  
Codes Of Practice ◽  
The World ◽  
Internal Forces ◽  
Load Tests ◽  
Foundation Structure ◽  
Research Analysis

Foundation structures, their testing and modelling their behavior is a wide area to research. Analysis of interaction between the subsoil and the foundation structures has been developed for many years. For the determination of stress in foundation structure is needed to determine the influence of the stiffness respectively pliability of subsoil to structural internal forces, and vice versa, how the stiffness of the foundation structure affects the resulting subsidence. A lot of different elements are tested or modeled in the world. Previous researches on loading of reinforced slabs have shown a number of phenomena significantly influencing their strength and behaviour. However, no general agreement is yet found on a physical theory (either in codes of practice or in design models) suitably describing the interaction between the subsoil and the foundation structures.  

Experimental Testing the Interaction of Fiber-Concrete Foundation Slab and Subsoil and Compare the Results with Numerical Models

2014 ◽  
Vol 1020 ◽  
pp. 227-232 ◽  
Author(s):  
Vojtech Buchta
Keyword(s):  
Civil Engineering ◽  
Numerical Models ◽  
Experimental Testing ◽  
Concrete Slab ◽  
Fiber Type ◽  
Test Element ◽  
Actual Behavior ◽  
Foundation Base ◽  
Internal Forces ◽  
Foundation Structure

We solve interaction between the foundation base and the subsoil in civil engineering quite often. For the determination of stress in foundation structure is needed to determine the influence of the stiffness respectively pliability of subsoil to structural internal forces, and vice versa, how the stiffness of the foundation structure affects the resulting subsidence. It is necessary to compare the mathematical models with the actual behavior of the real structure. In 2013 was realised static load on testing equipment in the campus of Faculty of Civil Engineering, VSB–TU Ostrava. Dimensions of test element was 2000 x 2000 x 170 mm and the concrete slab was reinforced with steel fiber type DRAMIX 3D 65/60B6. During measurements were performed and recorded: tensometrical measurement on the surface of the slab, tensometrical measurement inside the slab, measuring the vertical load, measurement of the vertical deformation, measuring the stress on the interface of the slab and soil. Were also developed numerical models of this test in program Nexis. Comparison the test results with numerical models are presented in this paper. [1,9]

Serviceability Assessment of Composite Footbridge Under Human Walking and Running Loads

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
Faraz Sadeghi ◽  
Ahmad Beng Hong Kueh
Keyword(s):  
Concrete Slab ◽  
Model Verification ◽  
Human Walking ◽  
Steel Beams ◽  
Vibration Source ◽  
Design Standards ◽  
Reinforced Concrete Slab ◽  
Codes Of Practice ◽  
Current Design ◽  
Vibration Responses

Footbridge responses under loads induced by human remain amongst the least explored matters, due to various uncertainties in determining the description of the imposed loadings. To address this gap, serviceability of an existing composite footbridge under human walking and running loadings is analyzed dynamically in this paper employing a finite element approach. The composite footbridge is made-up of a reinforced concrete slab simply supported at two ends on top of two T-section steel beams. To model the walking and running loads, a harmonic force function is applied as the vibration source at the center of the bridge. In the model verification, the computed natural frequency of footbridge exhibits a good agreement with that reported in literature. The vibration responses in terms of peak acceleration and displacement are computed, from which they are then compared with the current design standards for assessment. It is found that the maximum accelerations and displacements of composite footbridge in presence of excitations from one person walking and running satisfy the serviceability limitation recommended by the existing codes of practice. In conclusion, the studied footbridge offers sufficient human safety and comfort against vibration under investigated load prescription.

scholarly journals DETERMINATION OF THE MOVEMENTS OF THE COMBINED FLOORING USING PROFILED FLOORING FROM HORIZONTAL LOADS

2021 ◽  
Vol 6 (9) ◽  
pp. 37-44
Author(s):  
O. Efimov ◽  
L. Gimranov ◽  
A. Fattahova ◽  
M. Chekanin
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Shear Stiffness ◽  
Horizontal Load ◽  
Joint Work ◽  
Reinforced Concrete Slab ◽  
Steel Reinforced Concrete ◽  
Common Solution ◽  
Supporting Frame

Combined steel-reinforced concrete floors using profiled flooring are the most common solution in buildings with a steel frame. Flexible stops ensure the joint work of the frame and the flooring disks. Deformations of the combined flooring, and therefore of the frame in the horizontal plane, can occur due to the possible appearance of uneven force effects that cause a shift. At the same time, the magnitude of these deformations is influenced by both the level of force influences and the shear stiffness of the flooring disk, as well as the malleability of the flexible stops connecting the latter to the supporting frame. The paper proposes a method for determining the deformations of the flooring disk and the supporting frame from a horizontal load. The problem is considered in which a square floor slab is based on a contour on the crossbars of the frame, but its fixing with flexible stops is provided on two parallel sides. A formula for determining the movements of the frame from the horizontal load is proposed. The displacement of the flooring disk is analytically determined, it is noted how the malleability of flexible stops affects the determination of the final result. Using the example of a numerical experiment, the possibility of using the proposed method is demonstrated. The movement in the flooring disks will allow to assess the rigidity of the frame from horizontal loads without focusing on the deformation of each component of the steel-reinforced concrete slab. In addition, it will help to use materials and resources more efficiently by optimizing design solutions.

scholarly journals Measurement of Flat Slab Deformations by the Multi-Image Photogrammetry Method

2017 ◽  
Vol 25 (4) ◽  
pp. 19-25 ◽  
Author(s):  
Marián Marčiš ◽  
Marek Fraštia ◽  
Tomáš Augustín
Keyword(s):  
Image Processing ◽  
Concrete Slab ◽  
Measurement Techniques ◽  
3D Measurement ◽  
Flat Slab ◽  
The World ◽  
Photogrammetric Method ◽  
Load Tests ◽  
Building Components ◽  
Photogrammetric Measurement

Abstract The use of photogrammetry during load tests of building components is a common practise all over the world. It is very effective thanks to its contactless approach, 3D measurement, fast data collection, and partial or full automation of image processing; it can deliver very accurate results. Multi-image convergent photogrammetry supported by artificial coded targets is the most accurate photogrammetric method when the targets are detected in an image with a higher degree of accuracy than a 0.1 pixel. It is possible to achieve an accuracy of 0.03 mm for all the points measured on the object observed if the camera is close enough to the object, and the positions of the camera and the number of shots are precisely planned. This contribution deals with the design of a special hanging frame for a DSLR camera used during the photogrammetric measurement of the deformation of flat concrete slab. The results of the photogrammetric measurements are compared to the results from traditional contact measurement techniques during load tests.

Comparison of Experimental Tests of Foundation Slabs

2015 ◽  
Vol 744-746 ◽  
pp. 383-386
Author(s):  
Vojtech Buchta ◽  
Jan Hurta ◽  
Roman Fojtik
Keyword(s):  
Civil Engineering ◽  
Experimental Tests ◽  
Foundation Base ◽  
Internal Forces ◽  
Foundation Structure

In civil engineering we solve problems with interaction between the foundation base and the subsoil often. For the determination of stress in foundation structure is needed to determine the influence of the stiffness respectively pliability of subsoil to structural internal forces, and vice versa, how the stiffness of the foundation structure affects the resulting subsidence. In this article I would like to compare subsidence and deformation of several different baseboards.

Experimental Measurement of Ground Base Plate / Experimentální Měření Základové Desky Na Podloží

2012 ◽  
Vol 12 (2) ◽  
pp. 26-31 ◽  
Author(s):  
Radim Čajka ◽  
Vojtěch Buchta ◽  
Kamil Burkovič ◽  
Roman Fojtík
Keyword(s):  
Experimental Measurement ◽  
Civil Engineering ◽  
Numerical Models ◽  
Base Plate ◽  
Testing Device ◽  
Foundation Slab ◽  
Internal Forces ◽  
Foundation Structure

Abstract Analyses of interaction between the foundation slab and the subsoil has been developed for many years. For the determination of stress in foundation structure is needed to determine the influence of the stiffness respectively pliability of subsoil to structural internal forces, and vice versa, how the stiffness of the foundation structure affects the resulting subsidence. At the Faculty of Civil Engineering testing device was constructed so that the phenomena could be examined and then compared with numerical models.

Determination of Internal Forces in End Plates of Simple End Plate Joints

2009 ◽  
Vol 12 (-1) ◽  
pp. 83-94
Author(s):  
Stefan Dominikowski ◽  
Piotr Bogacz
Keyword(s):  
End Plate ◽  
Internal Forces

Dimension and Frequency Profiles of Concrete Highway Bridges in New Madrid Region of Southeastern Missouri

1997 ◽  
Vol 1594 (1) ◽  
pp. 84-93 ◽  
Author(s):  
Ralph Alan Dusseau
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Highway Bridges ◽  
Ambient Vibration ◽  
Earthquake Hazards ◽  
Empirical Formulas ◽  
Reinforced Concrete Slab ◽  
Box Girder ◽  
Bridge Spans ◽  
New Madrid

The results of a study funded by the U.S. Geological Survey as part of the National Earthquake Hazards Reduction Program are presented. The first objective of this study was the development of a database for all 211 highway bridges along I-55 in the New Madrid region of southeastern Missouri. Profiles for five key dimension parameters (which are stored in the database) were developed, and the results for concrete highway bridges are presented. The second objective was to perform field ambient vibration analyses on 25 typical highway bridge spans along the I-55 corridor to determine the fundamental vertical and lateral frequencies of the bridge spans measured. These 25 spans included six reinforced concrete slab spans and two reinforced concrete box-girder spans. The third objective was to use these bridge frequency results in conjunction with the dimension parameters stored in the database to develop empirical formulas for estimating bridge fundamental natural frequencies. These formulas were applied to all 211 Interstate highway bridges in southeastern Missouri. Profiles for both fundamental vertical and lateral frequencies were then developed, and the results for concrete highway bridges are presented.

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