an

Design Considerations Modern codes and standards require that a transmitting tower be designed to resist dead and live wind and earthquake loads. Loads, forces, and stresses that result from temperature changes, movements due to differential settlements, or any combination of these should also be considered. Older towers should be carefully checked to assure that no significant changes in design criteria have been required, since their original design and erection, that would increase the possibility of failure. Dead and Live Loads Dead loads consist of the weights of the members of a tower and any equipment that is permanently attached to it, including any attached signs. AM transmitting towers support only their lighting equipment. The FM transmitting tower supports its transmission line, antenna, and lighting equipment. The microwave tower must support microwave dishes, reflectors, and  lighting equipment. The […]