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Theories for composite material structures are too difficult for such design engineers for constructionand some simple but accurate enough methods are necessary. The author has reported that some laminate orientationshave decreasing values of D 16 , B 16 , D 26 and B 26 stiffnesses as the ply number increases. For such plates, the fiberorientations given above behave as specially orthotropic plates and simple formulas developed by the author. Most ofthe bridge deck structures on girders have large aspect ratios. For such cases further simplification is possible byneglecting the effect of the longitudinal moment terms M x on the relevant partial differential equations of equilibrium.In this paper, the result of the study on the subject problem is presented. Key Words: composite material structures, specially orthotropic, longitudinal moment terms, finite difference method,beam theory 1. INTRODUCTION The future of material industry will depend on if and whenthe conventional construction materials are replaced by com-posite materials. If composite materials are used for construc-tion, the quantity is huge : in tons, not in kilos or pounds. Acomposite materials can be used economically and efficientlyin broad civil engineering applications when standards andprocesses for analysis, design, fabrication, construction andquality control are established. The problem of deterioratinginfrastructures is very serious all over the world. The U.S. CivilEngineering Research Foundation (CERF) report, “High-Performance Construction Material and System : An EssentialProgram for America and its Infrastructure”, published, in col-laboration with several organizations, U.S. Department ofTransportation figures as follows: (1) The road bridge condition in U.S.A at the year 2009,149,654 of the Americans 603,259 bridges are structur-ally deficient or obsolete. (structurally deficient 71,177,functionally obsolete 78,477) (2) 199,584 of these bridges are more than 50 years old andunsuitable for current or projected traffic. (3) Traffic delays alone will cost Americans $115 billion peryear in lost work time and fuel by the year 2009. Steel girders become rusty. The reinforcing bars embeddedin concrete beams or slabs are subject to corrosion caused byelectro-chemical action. Underground fuel thanks are undersimilar condition. In 1979, the U.S. Bureau of Standards(NIST) study showed that yearly loss caused by corrosionrelated damages mounted to 82 billion dollars, about 4.9% ofGNP. About 32 billion dollars could be saved if existing tech-nologies were used to prevent such losses [1].These figures are in the United States of America, where var-ious federal, state, and other agencies are doing their best inmaintaining such structures in good condition. The issue ofdeteriorating and damaged infrastructures and lifelines hasbecome a critically important subject in the United States aswell as Japan and Europe. The problem in developing nations,where degree of construction quality control and maintenanceare in question, must be much more profound [1,2].The composite materials can be effectively used for repair-ing such structures. Because of the advantages of these mate-rials, such repair job can fulfill two purposes:(1)Repair of existing damage caused by corrosion, impact,earthquake, and others.(2) Reinforcing the structure against anticipated future sit-

The Influence of the Aspect Ratio on the Composite Material Bridge Deck Structures