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.

Profiles of Design Dimensions and Fundamental Natural Frequencies for Steel Interstate Highway Bridges in Southeastern Missouri

1998 ◽  
Vol 1624 (1) ◽  
pp. 82-92 ◽  
Author(s):  
Ralph Alan Dusseau
Keyword(s):  
Highway Bridges ◽  
Ambient Vibration ◽  
Fast Fourier Transformation ◽  
Earthquake Hazards ◽  
Empirical Formulas ◽  
Interstate Highway ◽  
Fundamental Frequencies ◽  
Bridge Span ◽  
Bridge Spans ◽  
Steel Highway Bridges

Results from a research 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 bridges along Interstate 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 steel highway bridges are presented here. The second objective was to perform field ambient vibration analyses on 25 typical bridge spans along the I-55 corridor. These 25 spans included 17 steel girder spans. Eight seismometers were used to record ambient vibrations at four locations on each bridge span. These records of bridge motion versus time were each subjected to a fast Fourier transformation, and plots of amplitude versus frequency were generated. These plots were used to determine the fundamental vertical and lateral frequencies of the bridge spans measured. The third objective was to use these fundamental frequencies in conjunction with the dimension parameters stored in the database to develop empirical formulas for estimating fundamental frequencies. These formulas were applied to all 211 Interstate highway bridges in southeastern Missouri. Profiles for both the fundamental vertical and the lateral frequencies were then developed, and the results for the steel highway bridges are presented here.

Dynamic Response Test of Reinforced Concrete Slab under Blast Loading

2014 ◽  
Vol 507 ◽  
pp. 291-294
Author(s):  
Zhi Zhong Li ◽  
De Gao Tang ◽  
Wei Wei Li ◽  
Zhi Fang Yan
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Concrete Slab ◽  
Peak Load ◽  
Blast Loading ◽  
Reinforcement Ratio ◽  
Empirical Formulas ◽  
Reinforced Concrete Slab ◽  
Time Curve ◽  
Explosion Test

Reinforced concrete panels were tested explosion for reinforced concrete slab in the dynamic response under blast loading. Dimensions of 1300mm×1300mm×50mm plates under different reinforcement ratio were designed. Explosion test was carried out for three different batches of reinforcement ratio reinforced concrete slab in the explosion simulator. The load was calculated using empirical formulas. Blast loading time curve was obtained by the explosion test and the correctness of the numerical simulation method was verified. The results indicate that reinforced concrete slab under blast loading is different from static damage destruction. Diagonal cracks appear on plat under the blast loading destroyed. When the peak load is large, a large square cracks plate was appeared in the middle of the plate and accompanied diagonal cracks. When the peak load is small, diagonal cracks develop fully, square cracks were smaller.

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