Dynamic Analysis For Steel Towers Atop Buildings Of Different Ways Of Anchoring

In recent years, the steel towers atop buildings have been adopted in many regions in our country with the development of communication business. However, earthquake experiences reveal that the steel towers atop buildings will have strong reaction under earthquake action because of significant "whiplash effect". The systemic research on this structural system is seldom touched, and accordingly no design code can be provided as reference. Therefore, to engineering anti-seismic design, it is urgent to study the dynamic characteristics of steel towers atop buildings and the interaction between steel tower and the main structure.By aid of structural damp theory, the calculation method of equivalent viscous damping ratio of structural system of steel towers atop buildings is studied to reflect the various damping energy dissipation properties of steel tower and the main structure.There are two anchoring methods of steel towers atop buildings: self-supporting and guy line. Tow individual groups of examples are founded based on the structural dynamics and the mode-superposition response spectrum analysis method, and the structural dynamic behavior and response of two anchoring methods are compared. Analysis shows that the seismic effect of steel towers atop buildings is obviously enlarged than steels towers on ground. And also, the steel towers atop buildings can be seen as a TMD system to control the structure passively.Sometimes, the steel columns can not anchor in the concrete columns directly. In order to solve the problem, this paper especially presents a new anchoring method— —attachment. Through theoretical analysis, its feasibility and scope of application are studied. And analyze its dynamic behavior compared to the self-supporting method. In engineering background, this paper certificates its applicability and presents several proper styles of the anchorage points as reference for structural design.