Construction

Advanced Polymer Composites for Structural Applications in by L C Hollaway

By L C Hollaway

Over the last 3 a long time complicated polymer composites have emerged as an enticing development fabric for brand spanking new buildings and the strengthening/rehabilitation of latest structures and bridges. The ideas linked to the expertise, research and layout of polymer composites in building are regularly being researched and the growth made with this interesting fabric will proceed at an ever- expanding cost to fulfill the calls for of the development undefined. This quantity of complaints is from the second one ACIC 2004 foreign convention, which enthusiastic about the appliance and additional exploitation of complicated composites in building. The convention allowed practising engineers, asset managers, researchers and consultant of regulatory our bodies to advertise the lively trade of clinical and technical info at the speedily altering scene of complex composites in building. This quantity makes a speciality of the presentation of latest techniques, suggestions and case reports, that allows you to bring about higher exploitation of complex polymer composites and FRP fabrics for civil engineering infrastructure, rehabilitation and renewal.

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It should, however, be emphasized that a system which merely detects indications of damage or degradation without connecting it to structural response measures such as stiffness, deflection, frequency etc. is of little use to the owner of that structure. Vibration based methods are often used as a means of assessing structural response and can primarily be classified as belonging to either the forced vibration, or ambient vibration methods. The forced vibration method relies on the introduction of excitation through the use of a hammer, shaker or other equipment placed on the Characterization and Health Monitoring of FRP Bridge Systems 21 structure.

Considerable amount of research has been conducted in the area of damage detection using modal parameters, in which, mode shape changes [3], mode shape curvature [4], modal strain energy [5], flexibility changes[6], and other modal parameters are used to estimate the location and severity of the damage inside the structure. T~d where, 8. is the ithmodal vector and C is the system stiffness matrix. The contribution ofjthmember to ithmodal stiffness is then given by K, = cj&. (9) The fraction of modal energy of the ith mode contributed by the jthmember, also called modal sensitivity, is defined as I$ = K,lK, (10) Correspondingly, using * to represent the damaged structure, we can define the fraction of modal energy of a damaged structure as F*..

Testing under combined conditions (stress, moisture, solution, temperature, andlor other regime) at both the materials and structural levels is critical. Although tests conducted under controlled isolated conditions are important for the development of an understanding of degradation mechanisms and models for life-prediction, combined effects can be much more severe and in most cases will dominate overall response. Assessment and characterization of the effects of incomplete and under cure, especially for ambient temperature cure systems is essential.

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