Controlling the deflection of long beams using different patterns of pre-tensioning cables

Document Type : Article


Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran


Despite appropriate design of beams under bending and shear, the deflection of long steel beams usually exceeds the allowable range, and therefore the structural designers encounter challenges in this regard. Considering significant features of the cables, namely, low weight, small cross section, and high tensile strength, they are used in this research so as to control the deflection of beams. In this study, for the first time, theoretical relations are developed to calculate the increase in pre-tensioning force of steel cables under external loading as well as the deflection of steel beam with different support conditions and different patterns of cable. Moreover, required cross-sectional area of steel cable has been calculated to reach allowable deflection in steel beams with different support conditions and different patterns of cable. The obtained results show that the theoretical relations can appropriately predict the deflection of beam with different support conditions and different patterns of cable. In this study, simply supported as well as fixed supported beams are pre-stressed with V-shaped and modified V-shaped patterns of the cable. According to the obtained results, the modified V-shaped pattern of the cable is more efficient than V-shaped pattern one.


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