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   Influence of Changes in the Prestress Force on Dynamic Specifications of the Prestressed Concrete Beam  
   
نویسنده Babakhani Behrouz ,Rahami Hossein
منبع Numerical Methods In Civil Engineering - 2020 - دوره : 5 - شماره : 1 - صفحه:8 -14
چکیده    Prestress techniques tend to increase crosssectional capacity and optimize design. such features have made these techniques rather popular. over time, these structures tend to fail, and the reduction of prestress force over the lifetime of the structure is said to be one of the most significant destructive factors in these structures. this decrease in force occurs due to various reasons. in majority of cases, a cracking of prestressed concrete beams appears due to the reduction of prestress strength. where there is permanent monitoring by the sensors buried within prestressed tendons, the force of the tendons can be investigated. but given the high cost of this procedure, such monitoring cannot be implemented in many structures. nevertheless, it is possible to determine changes in prestress forces through investigating the dynamic behavior of structures. this paper examines the changes in the dynamic behavior of a prestressed beam experiencing a variety of prestress force levels. the idea is to monitor force changes in the prestressed tendons via examining certain dynamic characteristics of the beam (namely, modal damping and resonance frequency) and carry out repair prior to fail. the results show that with increasing the prestressing force, the system frequency increased and the system damping decreased.
کلیدواژه Pre-Stressed Beam ,Resonance Frequency ,Mode Damping ,Damage Detection ,Health Monitoring Of Structures
آدرس Islamic Azad University, East Tehran Branch, Department Of Civil Engineering, Iran, University Of Tehran, School Of Engineering Science, College Of Engineering, Iran
 
     
   
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