This paper is concerned about the study of two spans cable stayed bridges. Three common types of these bridges as harp, radiating and fan shapes arc considered. The static analysis considering single plane and double planes of cables as the mathematical models is carried out. The variations of pylon height to span of the bridge in all cases, the influence of connections between pylons and deck floor and the arrangements of cables are the major factors of this work. The effect of symmetrical and asymmetrical loads such as, the own weight of all structural elements, traffic load including impact, and wind loads in longitudinal and transverse directions of the bridges are taken into account. The study of fundamental natural frequencies is investigated. Finally, the dynamic analysis in time domain for some special cases is presented. In both static and dynamic analysis, the energy method, based on the minimization of the total potential energy of structural elements, via conjugate gradient technique is used. The procedure is carried out using the iterative steps to acquire the final configurations. The author constructed all computer programs used in the analysis. The major conclusions, which have been drawn from the present work, are outlined.
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