ESTIMATION OF WATER PONDING ON STEEL PLATE ATTACHED TO THE BOTTOM SURFACE OF REINFORCED CONCRETE SLAB OF HIGHWAY BRIDGES

2018 ◽  
Vol 74 (3) ◽  
pp. 376-384
Author(s):  
Hajime TACHIBANA ◽  
Sohichi HIROSE ◽  
Akira FURUKAWA ◽  
Keisuke NAKAMOTO
Keyword(s):  
Reinforced Concrete ◽  
Steel Plate ◽  
Concrete Slab ◽  
Highway Bridges ◽  
Bottom Surface ◽  
Reinforced Concrete Slab

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.

scholarly journals Serviceability limit state of two-way reinforced concrete slab strengthened with different techniques

2018 ◽  
Vol 162 ◽  
pp. 04001
Author(s):  
Eyad Sayhood ◽  
Ammar Ali ◽  
Zahraa Sharhan
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Limit State ◽  
Experimental Results ◽  
Bottom Surface ◽  
Reinforced Concrete Slab ◽  
Near Surface ◽  
Reinforced Concrete Slabs ◽  
Concrete Layer ◽  
Near Surface Mounted

The experimental results for service load of sixteen simply supported two way reinforced concrete slabs under the action of concentrated patch load were determined based on the amount of permissible deflections and the crack widths.All the slabs had the same overall dimensions and flexural steel reinforcement. Five types of strengthening were adopted. The first and second methods include applying either near surface mounted (NSM) or near reinforcement mounted (NRM) ferrocement layers. While the third method includes applying a concrete layer reinforced with welded wire fabric mesh of various diameters. The fourth and fifth methods include fixing CFRP rods and laminates, respectively, on the bottom surface of slabs. Strengthening techniques were applied on the bottom surface of fifteen slab specimens. In addition, a control slab specimen without any strengthening was used for the purpose of comparison. The calculated results for ultimate loads based on serviceability requirements (deflection and crack width according to both ACI and BS formulae) were lower than the experimental results.

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