โปรแกรมการวิเคราะห์เชิงพลวัตของโครงข้อแข็ง 2 มิติที่ติดระบบมวลหน่วงปรับค่า / ภาณุพงศ์ ไตรธรรม = A dynamic analysis program for 2-D frames with tuned mass dampers / Panupong Tritham
This research develops a computer program for dynamic analysis of linear elastic 2-D frames with tuned mass dampers (TMDs). Subjected to dynamic loads, such as earthquake and wind loadings. Invert iteration with shift method is employed to identify the natural frequencies and mode shapes of structures. Modal method is adopted for dynamic analysis with help of the state – space vector representation calculate time history respond of structure. To verify the developed program, the results of static analysis of the example structures are compared with those from STAAD III. While the result dynamic analysis of the example structures with TMD are compared with exact solution. The comparison indicate that obtain result from the program are consistence and accurate. Finally, the design examples of the 10- story frames with one and three bay with TMD subjected to earthquake (El Centro 1940) and wind loadings are considered. The effects of mass ratio and detuning of TMD are investigated in order to find an optimal parameters of TMD. It is found that the most effective mass ratio of TMD is around 0.03-0.07. However, the error in installation of TMD which causes detuning more than 20% makes TMD's effectiveness becomes insignificant.