Abstract
In this research study, horizontal impact tests were carried out on five reduced scale pier models using China’s most advanced multifunctional ultrahigh heavy drop hammer impact test system and DHDAS dynamic signal acquisition and analysis system. Due to the fact that the traditional measurement method can only be used for local measurement damage, and the volatility is high, this paper proposes a test method for the modal frequency identification of the overall damage of reinforced concrete pier and applies the ultrasonic damage measurement method to verify the results. The tests analyzed the modal frequencies and ultrasonic velocity identifications for the purpose of evaluating the impact damages of bridge piers, as well as the relationship between them. The results showed that the modal frequencies were consistent with the ultrasonic waves in identifying and evaluating the damages to the piers. Also, the modal frequency damage factors were determined to be functions of the ultrasonic wave velocity damage factors. Therefore, the results of this study confirmed that it was feasible to characterize the impact damages of piers using a modal frequency method.
Highlights
Pier structures may become damaged, cracked, or aged to varying degrees for a variety of reasons during their utilization
Researchers around the world have carried out studies regarding the identification of RC structural damages and have proposed a variety of identification methods [4,5,6]. ese methods mainly include static, dynamic, and dynamic-static combination methods. e static method is to analyze the static test data to determine the change of structural element stiffness, which can be used for damage assessments and the determination of structural bearing capacities [7]
The most commonly used damage identification methods are traditional experimental methods, such as acoustic or ultrasonic methods, electromagnetic methods, and radiography methods [13,14,15]. ese methods require the damage areas to be known beforehand, and it must be easy for the damage detection sensor to reach the tested part
Summary
Pier structures may become damaged, cracked, or aged to varying degrees for a variety of reasons during their utilization. You-Sheng completed a comparative analysis of several calculation methods for the natural frequencies of pile foundation piers and pointed out their respective advantages and disadvantages [28] These studies mainly use impact vibration test methods and numerical research methods. It has been found that the results of identifications of structural damages using modal frequencies to assess the overall damages of structures and study the overall damage information of the structures have shown high antinoise and identification accuracy abilities These types of methods have been observed to have convenient measurement adaptabilities [29,30,31]. Erefore, this study proposed to use a modal frequency method to identify the impact damages of reinforced concrete piers. A multifunctional ultrahigh heavy drop hammer impact test system and a DHDAS dynamic signal acquisition and analysis system were utilized in this study to carry out experimental horizontal impact tests on five reduced scale pier model specimens. e feasibility and accuracy of identification in the evaluations of the pier impact damages using modal frequencies were examined and analyzed, and a traditional ultrasonic velocity method was used for verification purposes
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
