Nowadays the serviceability criteria often govern contemporary structural design. Structures such as lightweight pedestrian bridges, slender floors, grandstands and long span stairs are prone to vibrations caused by human activities. Also lattice tower type structures are remarkably flexible, low in damping and light in weight that results in structures that are susceptible to human induced vibrations. Traditionally for such type of structures dynamic analysis is performed to evaluate only wind induced vibrations and effects on the structure. But there is a lack of understanding and inadequate design information of the building codes, regarding the slender tower dynamic response to human induced loads. The Thesis consists of three main parts: literature review on which the objective of the study and the tasks of the theses are based (section 1); part two deals with the experimental identification and approximation of human induced time varying forces (section 2); part three deals with the application of those loads to the lattice self-supporting tower structure and dynamic response to it (section 3). During the research numerous experimental investigations that can be divided in to two main groups were performed: 1) experimentally obtained continuous walking histories of individuals; 2) modal tests and measurements of response to the walking excitation of 19 full scale observation towers as well as the subjective assessment of vibration amplitudes of test persons. The theoretical part deals with the parameters that mostly influence the structure response to human induced loading, the effect of different walking force component on the total vibration of the structure, phenomenon and response of the structure to loads induced by a group of people. As a result the thesis presents a calculation methodology of assessing the maximum vibration level of light-weight lattice towers with different dynamic and geometric parameters due to human movement initiated dynamic loads of stochastic nature. It includes recommendations about the range of structures that requires considering the human dynamic loads, applicable loads itself, its dispositions, necessary parameters to adopt for calculations, the analytical solution for preliminary design calculations and criteria to limit vibrations due to comfort of visitors. Comparisons of experimentally obtained tower response and predictions were used to determine the accuracy of the proposed methodology and it is found to be sufficiently accurate to be used in the design process. The thesis contains 135 pages, 82 figures, 28 tables and a reference list of 136 sources.