Dynamic Experimental Analysis Of Concrete Elements Stiffness Subjected To Progressive Damage
(Almeida, Sandra Freire de)
Structural integrity assessment may be performed by experimental modalanalysis. The dynamic tests provide natural frequencies values whosechanges may be used to identify existent damage and to estimate theequivalent stiffness of cracked elements. Nowadays more researchesabout dynamic effects on civil structures are becoming available. Amongall aspects related to the dynamic behaviour of reinforced concretestructures, the progressive damage of their elements is one of greatrelevance. According to the damage progress, the natural frequenciesdecrease and the damping factors increase. These dynamiccharacteristics changes allow getting the equivalent stiffness valuesfor the various degrees of cracking, even indicating the closeness tofailure. The objective of this research is to assess the concreteelements integrity and to discuss the results from experimental modalanalysis due to different damage levels. There were carried throughdynamic and static experiments to evaluate the modulus of elasticity ofconcrete. It was observed its changes related to concretemicro-cracking, compression strength and age. The experimental testingshad been carried through in cylindrical and prismatic specimens. Theresults obtained from free vibration tests were compared with the onesobtained from the usual static tests. Reinforced concrete beams werealso subjected to static and dynamic testings to assess the behavior ofthe dynamic parameters throughout a damage process. The dynamicnon-destructive tests can be used to find out concrete and reinforcedbeam properties, beyond its economic advantages, easiness to do andtrustworthiness
Resumos Relacionados
- Risk Scales And Factors Predictive Of Sexual Offence Recidivism
- Sexual Offence Recidivism: Prediction Versus Understanding
- Ketamine Brain Damage And The Near Death Experience
- Ketamine Brain Damage And The Near Death Experience
- Importance Of Human Resource Development
|
|
