DESIGN OF FRP STRUCTURES IN SEISMIC ZONE | Top Glass

STRUTTURE IN VETRORESINA IN ZONE SISMICHE - MANUALE

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quadrato rossoDESIGN OF FRP STRUCTURES IN SEISMIC ZONE
Giosue' Boscato, Carlo Casalegno, Salvatore Russo

THE MANUAL

The use of FRP (Fibre Reinforced Polymer) material in the structural engineering field is by now current practice and supported by theoretical studies as well as many applications and constructions.
FRP material is widely accepted in the strengthening of existing structures (made by reinforced concrete, steel, wood and masonry) but not yet commonly used for new buildings even if some recent all-FRP constructions, in particular built with FRP members made by pultrusion process, are very promising.
The study of the structural behaviour of pultruded FRP members, especially in the case of static loads, has been widely developed. Instead, for what concerns the dynamic response, very few experimental and analytical research projects have been proposed. The issue is particularly interesting because of the mechanical characteristics of pultruded FRP material.
The elastic-brittle constitutive law with anisotropic mechanical behaviour imposes some specific precautions, while the high durability, the low density of 1700-1900 kg/m3 and the relatively high values of strength suggest its potential and promising application also in seismic zones.
The dynamic properties of pultruded FRP material are characterized by high periods of vibration, low frequency and a spontaneous dissipative capacity of the dynamic actions due to its low density. Currently there are no available guidances for the seismic design for structures with pultruded FRP members.

The aim of this manual is to address the issues related to the design of pultruded FRP structures subjected to static and dynamic loading. After a thorough introduction the manual gives a practical guidance on how to address the structural design of pultruded FRP structures. The final part – chapter 5 - is dedicated to a new software, named FRP-Design Software (FRP-DS), with which is possible set up to structural verifications in supporting the common commercial numerical code.
The development of the manual is the following:
Chapter 1 (pp. 6 - 20), INTRODUCTION, provides a general background on FRP pultruded profiles, for what concerns the material, the structural behavior, the availability of standards, guidance documents and manuals; a part is dedicated to notable applications.
In Chapter 2 (pp. 21 - 35), BASIC PRINCIPLES FOR THE SEISMIC ANALYSIS, the synthesis of the key-aspects related to the seismic design, such as the definition of period of vibration, damping coefficient, behaviour factor and the dissipation capacity are discussed.
Chapter 3 (pp. 36 - 87), EXAMPLE OF CALCULATION, provides a calculation example of a FRP spatial truss structure taking into account the different load combinations in static and seismic fields and the analysis at ultimate and serviceability limit state.
In Chapter 4 (pp. 88 - 94), FINAL EVALUATION FOR DEISGN OF FRP STRUCTURES IN SEISMIC ZONE, some final considerations for the design of FRP structures in seismic zone are presented.
Chapter 5 (pp. 95 - 116), FRP DESIGN SOFTWARE (FRP-DS), illustrates the features of the FRP Design Software.

Acknowledgements

The authors thank Top Glass SpA for the understanding of the potential capacity of the pultruded FRP material in civil engineering, architecture and construction fields.
This work was possible thanks to the fundamental support of the Top Glass SpA and OCV Italia Srl - OWENS CORNING (www.ocvitalia.it) and Polynt (www.polynt.it) as official suppliers of raw materials used for the manufacturing of profiles used in experimental tests.
The authors thank also Eng. Mauro Calderan, from IUAV University of Venice, Italy, who collaborated to the build the FRP-DS software.

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