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.

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.

ANALYSIS OF DURABILITY OF REINFORCED CONCRETE STRUCTURES OF BRIDGES ACCORDING TO THEIR TYPICAL DESIGNS

2020 ◽  
Vol 264 (4) ◽  
pp. 58-63
Author(s):  
Larysa Bodnar ◽  
◽  
Serhii Zavhorodnii ◽  
Serhii Stepanov ◽  
Vitalii Yastrubinetskyi
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Highway Bridges ◽  
Reinforced Concrete Structures ◽  
Bridge Management ◽  
Bridge Span ◽  
Standard Design ◽  
Standard Designs ◽  
Bridge Spans ◽  
The Impact

Thousands of bridges built in the 20th century are operated on Ukrainian roads. In the limited funding of the road industry of Ukraine, the age of highway bridges is constantly increasing, the number of defects in structures is growing. The largest number of defects is concentrated in the bridge spans. The main part of the bridge spans consists of prefabricated reinforced concrete beams, manufactured in factories of reinforced concrete structures according to standard designs developed in the middle of the last century. As a result of long-term operation of bridges, the shortcomings of these designs which reduce the service life of bridge spans and bridges in general are revealed. The systematic approach is required to study this process. The Analytical Expert Bridge Management System (AESUM) operates in the Ukravtodor system. This software complex accumulates all the information on the results of inspections (certification) of bridges on public roads. The special module AESUM – a database of standard designs of bridge spans which is constantly updated was developed to make decisions on repair works taking into account the features of structures on standard designs, to store this information in a single complex, in electronic form. Standard designs of reinforced concrete bridge spans built and operated on the roads of Ukraine are considered, and a comparative analysis of the features of these designs is performed taking into account the impact on the safety of bridge operation, their main features and shortcomings are given. The concept of rank of the standard design on durability is entered. A formula for estimating the durability of bridge span of a standard design using this concept is proposed. The analysis of durability of bridge span is performed. A number of problematic standard designs have been identified. Keywords: road bridge, standard designs, durability.

Analytical Modeling and Experimental Verification of the Vibrations of the Zigzag Microstructure for Energy Harvesting

2010 ◽  
Vol 133 (1) ◽  
Author(s):  
M. Amin Karami ◽  
Daniel J. Inman
Keyword(s):  
Energy Harvesting ◽  
Resonance Condition ◽  
Low Frequency ◽  
Dominant Frequency ◽  
Design Guidelines ◽  
Ambient Vibration ◽  
Micro Electro Mechanical Systems ◽  
Fundamental Frequencies ◽  
Near Resonance ◽  
Tip Mass

This paper addresses an issue in energy harvesting that has plagued the potential use of harvesting through the piezoelectric effect at the micro-electro-mechanical systems (MEMS) scale. Effective energy harvesting devices typically consist of a cantilever beam substrate coated with a thin layer of piezoceramic material and fixed with a tip mass tuned to resonant at the dominant frequency of the ambient vibration. The fundamental natural frequency of a beam increases as its length decreases, so that at the MEMS scale the resonance condition occurs orders of magnitude higher than ambient vibration frequencies, rendering the harvester ineffective. Here, we propose a new geometry for MEMS scale cantilever harvesters with low fundamental frequencies. A “zigzag” geometry is proposed, modeled, and solved to show that such a structure would be able to vibrate near resonance at the MEMS scale. An analytical solution is presented and verified against Rayleigh’s method and is validated against a macroscale experiment. The analysis is used to provide design guidelines and parametric studies for constructing an effective MEMS scale energy harvesting device in the frequency range common to low frequency ambient vibrations, removing a current barrier.

Fatigue Strength of Deteriorated Steel Highway Bridges

1990 ◽  
Vol 116 (10) ◽  
pp. 2671-2690 ◽  
Author(s):  
Patrick D. Zuraski ◽  
John E. Johnson
Keyword(s):  
Fatigue Strength ◽  
Highway Bridges ◽  
Steel Highway Bridges
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