Structural Engineering

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Browsing Structural Engineering by Subject "Allowable Strength Design"

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    Design Module for Self-Supporting Steel Latticed Communication Towers
    (Addis Ababa University, 2018-10) Samuel, Tilahun; Shifferaw, Taye (PhD)
    Self-supporting towers are one of the most essential and common steel structures which are being constructed quite frequently to provide a better facility in communication network to the people. Hence, the failure of such a structure is a major concern. Therefore, utmost priority must be given in considering all possible extreme conditions for designing communication towers, by evaluating and studying their wind and seismic behaviors properly. In this study, concepts behind codes specifications in relation with, equal angle steel section used as structural members in communication towers and communication tower itself, have been investigated thoroughly, so that they can be referred as a principles for analysis and design. In this research, wind and seismic behavior of self-supporting steel latticed communication towers have been studied for 35 m/s, 40 m/s, 45 m/s, and 50 m/s wind speed, in five different seismic zones, by analyzing different height of bare towers with XX bracing system. Moreover, charts for specified wind speeds and seismic zones which can be used as preliminary design for communication towers has been developed. These charts shows the responses of towers with different heights, wind speeds and seismic loads in different loading directions. In addition to that, step by step design procedure and design of articulated modular self supporting steel latticed tower is presented with the help of algorithm and flowchart by using recommended allowable strength design codes specifications, in relation with analyzing and designing of steel communication tower. Finally, the design module is prepared in a way that it can be used as a Guide line in designing and analyzing the effect of wind load and seismic load on the steel latticed communication towers.