scholarly journals EVALUATION OF STIFFENING EFFECT AND FATIGUE RESISTANCE OF ADHESIVE-APPLIED BOTTOM SURFACE THICKNESS INCREASE RC SLAB WITH CFRP GRID

2014 ◽  
Vol 68 (1) ◽  
pp. 502-509 ◽  
Author(s):  
Yusuke OIKAWA ◽  
Tadashi ABE ◽  
Kota NAGAI ◽  
Atsuya KOMORI
Keyword(s):  
Fatigue Resistance ◽  
Bottom Surface ◽  
Thickness Increase ◽  
Rc Slab ◽  
Stiffening Effect ◽  
Surface Thickness

scholarly journals NON-DESTRUCTIVE EVALUATION FOR HORIZONTAL CRACKS IN EXISTING RC SLABS BY ANALYSIS-AIDED IMPACT ELASTIC-WAVE METHODS

2012 ◽  
Vol 06 ◽  
pp. 670-675
Author(s):  
Heung-Soo Lee ◽  
Toshiro Kamada ◽  
Shinya Uchida ◽  
Toshiki Iwasaki
Keyword(s):  
Elastic Wave ◽  
Highway Bridges ◽  
Bottom Surface ◽  
Response Analysis ◽  
Wave Method ◽  
Rc Slab ◽  
Ball Diameter ◽  
Rc Slabs ◽  
Wave Methods ◽  
Non Destructive

In this study, impact elastic-wave method was performed at the bottom surface of RC slab cut from an existing highway bridges to survey the horizontal cracks. Before measurements by impact elastic-wave method, impact response analysis was applied to determine optimal steel ball diameter, distance between impact point and receiving point of elastic-wave. Efficiency of analysis-aided impact elastic-wave method was confirmed by drilling and observing the interior of the RC slab by stick scanner. Evaluation results by this method agreed well with results of visual inspection. Thus, validity of the analysis-aided impact elastic-wave method on detection of horizontal cracks in RC slabs of highway bridges was demonstrated.

The Deflection of Donut Type Hollow Slab Considering Crack Behaviors

2013 ◽  
Vol 577-578 ◽  
pp. 621-624
Author(s):  
Joo Hong Chung ◽  
Hyun Ki Choi ◽  
Seung Chang Lee ◽  
Chang Sik Choi
Keyword(s):  
Crack Width ◽  
Hollow Spheres ◽  
Building Structures ◽  
Tension Stiffening ◽  
Cracking Behavior ◽  
Bond Slip ◽  
Crack Behavior ◽  
Rc Slab ◽  
Stiffening Effect ◽  
Crack Space

Recently, various types of slab systems which can reduce self-weight of slabs have been studied as the height and width of building structures rapidly increase. A hollow slab system is widely known as one of the effective slab system which can reduce self-weight of slab. According to previous studies, the hollow slab with donut type hollow sphere had enough flexural strength. On the other hand, there were some differences in flexural stiffness and deflection between general RC slab and donut type hollow slab. The deflection of hollow slab was influenced by the shapes of hollow spheres due to its different second moment of inertia and amount of concrete surrounding bottom re-bar. Especially, the cracking behaviors also influence the deflection of slab. General RC slab deflection has been sufficiently investigated and some models to consider the crack behavior such as crack width, crack space, tension stiffening effect, bond-slip relationship. However, there is no study about the crack behavior on the hollow slab. Therefore, the purposes of this paper are to presents the cracking behavior of donut type hollow slab and to evaluate the deflection considering the crack behavior under flexural load.

scholarly journals EVALUATION OF FATIGUE RESISTANCE AND MAINTENANCE METHOD OF RC SLAB WITH THE TOP SURFACE REINFORCED BY OVERLAYING THE SFRC

2011 ◽  
Vol 65 (1) ◽  
pp. 485-492
Author(s):  
Tadashi ABE ◽  
Makiko TAKANO ◽  
Tetsukazu KIDA ◽  
Takayoshi KODAMA
Keyword(s):  
Fatigue Resistance ◽  
Rc Slab

scholarly journals EVALUATION OF FATIGUE RESISTANCE AND MAINTENANCE OF RC SLAB REINFORCED BY CFS UNDER RUNNING WHEEL LOAD

2011 ◽  
Vol 65 (1) ◽  
pp. 493-500
Author(s):  
Tadashi ABE ◽  
Tetsukazu KIDA ◽  
Chanho WON ◽  
Atsuya KOMORI
Keyword(s):  
Fatigue Resistance ◽  
Running Wheel ◽  
Wheel Load ◽  
Rc Slab
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