scholarly journals STUDY ON FIRE RESISTANCE OF REINFORCED CONCRETE SLAB UNDER THE POSITIVE BENDING MOMENT

2008 ◽  
Vol 73 (626) ◽  
pp. 677-684 ◽  
Author(s):  
Toshihiko NISHIMURA ◽  
Shigeo UEHARA
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Concrete Slab ◽  
Bending Moment ◽  
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 Study of fire-resistance of reinforced concrete slab of a new type

2017 ◽  
Vol 116 ◽  
pp. 02018 ◽  
Author(s):  
Oleg Kalmykov ◽  
Ludmila Gaponova ◽  
Petro Reznik ◽  
Sergey Grebenchuk
Keyword(s):  
Reinforced Concrete ◽  
Fire Resistance ◽  
Concrete Slab ◽  
Reinforced Concrete Slab ◽  
New Type

Fire Behaviour of GFRP-Reinforced Concrete Slab Strips: Fire Resistance Tests and Numerical Simulation

2021 ◽  
pp. 788-800
Author(s):  
António P. C. Duarte ◽  
Inês C. Rosa ◽  
Mário R. T. Arruda ◽  
João P. Firmo ◽  
João R. Correia
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Fire Resistance ◽  
Concrete Slab ◽  
Fire Behaviour ◽  
Reinforced Concrete Slab ◽  
Resistance Tests

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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