scholarly journals Effect of Successive Impact Loads From a Drop Weight on a Reinforced Concrete Flat Slab

2019 ◽  
Vol 281 ◽  
pp. 02003 ◽  
Author(s):  
Ali Jahami ◽  
Yehya Temsah ◽  
Ossama Baalbaki ◽  
Mohamad Darwiche ◽  
Youmn Al-Rawi ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Impact Load ◽  
Concrete Slab ◽  
Residential Buildings ◽  
Structural Elements ◽  
Dynamic Impact ◽  
Rock Falls ◽  
Reinforced Concrete Slab ◽  
Flat Slabs ◽  
Different Types

Lebanon is one of the countries which are at high risk of experiencing rock falls. In order to ensure public safety, engineers must take into consideration this risk. In the past years, numerous researches were conducted on the behavior of horizontal structural elements, slabs, of different types under dynamic impact load. Reinforced concrete flat slabs are commonly used slabs in residential buildings. To build a profound understanding of the structural behavior of the slabs under such loadings, it is important to investigate the effect of energy dissipation on the equivalent impact force, mid-span deflection and damage pattern. In this study a sample reinforced concrete slab of 500 x 1000 x 100 mm dimensions is considered. The aim of this paper is to find how these factors vary with the increase in energy as the drop load resembling the real rock fall is left to drop freely from different heights 0.6 m and 1 m.

scholarly journals TENDENCY IN STRUCTURAL ELEMENTS OF BUILDINGS FOCUSED ON REINFORCED CONCRETE SLAB WITHOUT BEAMS

2019 ◽  
Vol 25 (61) ◽  
pp. 1051-1056
Author(s):  
Nagayoshi SOU ◽  
Yoshihisa NAKATA ◽  
Kazuki TAJIMA ◽  
Atsunori MIYATA ◽  
Takumi ARAMAKI ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Structural Elements ◽  
Reinforced Concrete Slab

scholarly journals TENDENCY IN STRUCTURAL ELEMENTS OF BUILDINGS FOCUSED ON REINFORCED CONCRETE SLAB WITH BEAMS

2020 ◽  
Vol 26 (62) ◽  
pp. 37-42
Author(s):  
Nagayoshi SOU ◽  
Yoshihisa NAKATA ◽  
Kazuki TAJIMA ◽  
Takumi ARAMAKI ◽  
Atsunori MIYATA ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Structural Elements ◽  
Reinforced Concrete Slab

3D modelling of reinforced concrete slab with yielding supports subject to impact load

2016 ◽  
Vol 21 (7-8) ◽  
pp. 988-1025 ◽  
Author(s):  
A. Kezmane ◽  
B. Chiaia ◽  
O. Kumpyak ◽  
V. Maksimov ◽  
L. Placidi
Keyword(s):  
Reinforced Concrete ◽  
Impact Load ◽  
Concrete Slab ◽  
3D Modelling ◽  
Reinforced Concrete Slab

scholarly journals Structural performance assessment of reinforced concrete flat slab-edge column connections under the effects of outward eccentricity

2015 ◽  
Vol 8 (2) ◽  
pp. 164-195
Author(s):  
N. G. B. Albuquerque ◽  
G. S. S. A. Melo
Keyword(s):  
Reinforced Concrete ◽  
Failure Modes ◽  
Concrete Slab ◽  
Bending Moment ◽  
Structural Performance ◽  
Structural Behaviour ◽  
Reinforced Concrete Slab ◽  
Specific Test ◽  
Flat Slabs ◽  
Vertical Displacements

Although several advantages - either constructive or architectural - are assigned to flat slabs, the continuity between consecutive spans in multifloor buildings may turn slab-column connections into a critical region, due to the limited contact between both elements. When transferring moments caused by horizontal and/or vertical eccentric loads are present, these effects are even more pronounced on external panels. Specific studies on the effects of outward eccentricities are still rather scarce, although it is recognized that the codes, in general, are concerned with eventually meeting all potential cases, seeking to improve safety structural performance. Some current recommendations are based on considerable extrapolations, whose theory was originally developed for cases of asymmetric loading at internal connections and need to be consolidated with specific test data. Thus, to investigate the structural behaviour of slabs-edge columns connections, four specimens were tested, reproducing a 2,350 mm x 1,700 mm portion of a 180 mm thick reinforced concrete slab adjacent to a 300 mm x 300 mm cross section squared edge column, with a projection at the base for the imposition of eccentricities. The position of the support under the column has determined the eccentricity, defining in physical terms the interaction between bending moment and shear force, as follows: 300 mm (inward), centred (reference) and 300 mm and 400 mm (outward). Experimental results allowed to comparatively assess the performance of the specimens relating the strain measurements in steel and concrete, vertical displacements, rotations, failure mode and ultimate loads of the slabs. Results indicate that the influence of transferring moments on failure modes is much more pronounced than the shear action in the case of edge connections subjected to outward eccentricities.

scholarly journals Experimentally Validated Numerical Analysis of Reinforced Concrete Slab-Column Connections Subjected to Punching Shear

2020 ◽  
Vol 10 (2) ◽  
pp. 125-132
Author(s):  
S.C. Floruț ◽  
D.A. Popescu ◽  
V. Stoian ◽  
D. Daniel ◽  
T. Nagy-György ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Numerical Modelling ◽  
Concrete Slab ◽  
Maximum Load ◽  
Shear Capacity ◽  
Experimental Investigations ◽  
Reinforced Concrete Slab ◽  
Finite Element Software ◽  
Flat Slabs ◽  
Load Carrying

AbstractThe paper presents the results of experimental investigations and numerical analyses performed on reinforced concrete flat slabs. Two tests were carried out on two flat slab specimens designed without specific shear reinforcement. The present paper deals only with the experimental behaviour and numerical modelling of such slabs, this representing the initial part of a larger study which aims to evaluate the shear capacity of such deficient slabs resulted from faulty design or execution and to identify viable and efficient strengthening solutions. ATENA finite element software package was used to numerically model the behaviour of the specimens. A very good agreement was achieved between the results of experimental investigations and numerical modelling with deviations of 0.2% in terms of maximum load carrying capacity and of 7% in terms of corresponding displacement. The specimens were able to carry loads of more than 950kN, larger than those evaluated using designated Eurocodes, displaying a safety factor of 2.72.

scholarly journals A review on the performance of reinforced concrete structures under blast loading

2020 ◽  
Vol 3 (4) ◽  
pp. 216-228
Author(s):  
K. Senthil ◽  
Iwansh Gupta ◽  
S. Rupali ◽  
Loizos Pelecanos
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Slab ◽  
Concrete Columns ◽  
Reinforced Concrete Beam ◽  
Structural Behavior ◽  
Charge Weight ◽  
Structural Elements ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Columns

An explosion on the elevated structures caused by terrorist activities or manmade events can induce significant deformations in the Civil Engineering structures. Therefore, it is necessary to review the response of the structural behavior such as reinforced concrete slab, reinforced concrete beams, and columns. On the basis of this objective, a detailed literature review is conducted to understand the scope for protecting such structures and the structural behavior under blast loading. Based on the detailed literature survey, the investigations about the behavior of conventional reinforced concrete columns and slab initiated in 2005 however, the behavior of reinforced concrete beam was focused since the year 2010. Also, the literature reveals that the investigations on structural elements using analytical techniques are limited in comparison to experiments and simulations. In addition to that, the response of the structural elements was predicted and the trend was calibrated and fitted logarithmically with the experimental results. The predicted spall diameter in the reinforced concrete slab is 0.95 m corresponding charge weight of 100 kg however the influence of spalling was found to be negligible after the 100 kg of charge weight. The predicted spall length in the reinforced concrete beam is 1.6 m corresponding charge weight of 100 kg and the effect may be negligible after 100 kg of charge weight. The predicted deflection in the reinforced concrete columns is 30 mm corresponding to a peak reflected impulse of 1000 MPa-ms, whereas the deflection was found to be negligible after the 1000 MPa-ms of peak reflected impulse.

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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