Analysis and design of a telecommunication steel tower strengthened with FRP plates

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dc.contributor.author VLACHAKIS, KONSTANTINOS en
dc.date.accessioned 2019-03-27T10:43:04Z
dc.date.available 2019-03-27T10:43:04Z
dc.date.issued 2019-03-27
dc.identifier.uri http://dspace.lib.ntua.gr/handle/123456789/48516
dc.identifier.uri http://dx.doi.org/10.26240/heal.ntua.9337
dc.rights Default License
dc.subject Ινοπλισμένα Πολυμερή el
dc.subject Ιστός τηλεπικοινωνιών el
dc.subject Ενίσχυση el
dc.subject Πειραματικές δοκιμές el
dc.subject Εναλλακτική μέθοδος el
dc.subject Carbon Fiber Reinforced Polymer en
dc.subject telecommunication tower el
dc.subject Alternative method el
dc.subject Experimental testing el
dc.subject Stregthening el
dc.title Analysis and design of a telecommunication steel tower strengthened with FRP plates en
dc.contributor.department ΔΠΜΣ Δομοστατικός Σχεδιασμός και Ανάλυση Κατασκευών el
heal.type masterThesis
heal.classification CIVIL ENGINEERING en
heal.language en
heal.access free
heal.recordProvider ntua el
heal.publicationDate 2018-10-25
heal.abstract Telecommunication lattice towers are probable the most common type of tower used for telecommunication purposes. They have many advantages like the easy on-site transport and erection due to the use of angle sections. However, over the last years several towers’ failures have occurred due to severe weather conditions. Also, telecommunication market needs have a tremendous increase, more and larger antennas need to be placed on existing towers. Based on the above it seems that in many cases strengthening of existing towers is unavoidable. In the current practice, replacing the leg member with a larger angle is not feasible, so a second angle is usually inserted and connected with the existing section to form a built-up member in a star-battened configuration. This common strengthening method has some significant disadvantages, with most important the increasement of the structural weight and the area swept by the wind, and therefore the wind forces. An alternative strengthening method is introduced in this thesis, by which the legs or braces are strengthened using Carbon Fiber Polymer plates (CFRP). Because both literature and experimental tests on steel sections strengthened with CFRP plates are limited, it is needed to be executed several experimental tests on steel sections strengthened with CFRP plates. For this purpose, three tests are executed on such specimens, one tensile test and two four-point bending tests, in order to estimate the response and the strength of strengthened steel members. Besides the tests, analytical calculations based on two different methods and numerical analyses using Finite elements software are made. As it is concluded, CFRP strengthening increased tensile and bending capacity of the steel plate almost 5 times, independently if the CFRP was in the tension or in compression side. That means that CFRP plates have also a large strength on compression stresses. Using the results of the experimental tests, the design of a telecommunication tower strengthened with CFRP plates follows. At first, an evaluation of a typical existing tower is made. As it is proved the existing tower cannot bear some typical loads in order to fulfil codes’ requirements and future telecommunication needs. Both towers’ legs and braces are overloaded almost all over the height of the tower. In the alternative strengthening method CFRP plates are bonded only to members that fail. This application doesn’t increase the wind loads since the reference wind area is the same and also there is no increase in dead loads. Nonlinear analysis and then structural design is executed. As it is concluded, finally, the strengthening of an existing telecommunication tower using CFRP plates is a possible solution, that may be very effective and has certain advantages comparing with the conventional strengthening method. It is obvious, that more research need to be done so that this alternative method can be feasible. (en) el
heal.advisorName Vayas, Ioannis en
heal.committeeMemberName Vamvatsikos, Dimitrios en
heal.committeeMemberName Thanopoulos, Pavlos el
heal.academicPublisher Σχολή Πολιτικών Μηχανικών el
heal.academicPublisherID ntua
heal.numberOfPages 69
heal.fullTextAvailability true

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