The following information was submitted:
Transactions: INTERNATIONAL JOURNAL of MATHEMATICAL MODELS AND METHODS IN APPLIED SCIENCES
Transactions ID Number: 17-166
Full Name: Mirela Popa
Position: Lecturer
Age: ON
Sex: Female
Address: 124, Mamaia Blvd, 900527, Constanta, Romania
Country: ROMANIA
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E-mail address: mpopa@univ-ovidius.ro
Other E-mails: pmirela2003@yahoo.com
Title of the Paper: The response of maritime structures with vertical walls at breaking wave forces in terms of duration of the impact
Authors as they appear in the Paper: Mirela Popa,Gabriela Draghici,Cosmin Filip
Email addresses of all the authors: mpopa@univ-ovidius.ro,g.draghici@yahoo.com,filip.cosmin@yahoo.com
Number of paper pages: 8
Abstract: Usually for design and verification of maritime structures, the effects of forces generated by waves are obtained by static calculation, even for these actions is clearly evident the time variation. This because of the large difference between waves period and natural period of maritime structure and it is expressed by a dynamic amplification factor less than or close to 1. Recent researches have shown that, under certain conditions, the impact waves on maritime structures generate a high intensity pressures that vary quickly in time. In such cases it requires a dynamic analysis. The dynamic analysis, unlike static analysis in wich the wave action is described only by its maximum value, requires the loading history's definition. The loading history can be approximated like a triangular time-history described by three quantities: the maximum amount of impact force, rise time and total duration. The structural response to the dynamic action depends not only from the!
external forces but also its dynamic characteristics, like its natural periods. For this reason care have been given to how you can obtain a discrete model as simple and which takes into account the special boundary conditions, using type SPRING finite element. In this way the natural periods can be obtained quickly, using FREQUENCY modules implemented in finite element programs. From the modal time history analysis revealed a significant increase in the response obtained from the dynamic analysis to those obtained by static analysis, which is expressed by high levels of the dynamic amplification factor. This paper presents the results from a study of the structural response (the form of top displacement) in order to determine the dynamic amplification factor and it depend of the rise time (tr) and the total duration (td) of shock. Also, through response spectra, we studied how the maximum displacement response values vary depending on the natural period and on the time !
characteristics of shock, for the constant value of the maximum force.
Keywords: Dynamic amplification factor, Equivalent static force, Response spectra, Response time history, Rise time, Total duration, Triangular shock
EXTENSION of the file: .pdf
Special (Invited) Session: Studies related to maritime structures response to wave forces type triangular shock
Organizer of the Session: 658-377
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