Study On Wind-induced Dynamic Response And Wind Vibration Coefficient For Double-layer Latticed Shell Roof Structures

In response to the demand for architecture and use function, construction oflarge-span roofs is increasing. Enlargement of the span of these structures inevitablytend to involve light–weighted roofs, which lead these structures sensitive to windload, therefore the effects of wind load, especially of dynamic wind load arebecoming significant at their design stage. Double-layer latticed sphere shell structureis one of the widely-used styles in roof structures, but the wind load design for thisstructure hasn't been stipulated in existing Chinese load code. So it's an urgent needof proposing a kind of wind response analysis method suited for double-layer latticedshell structures. The paper presents an overview of the analysis method about wind dynamicvibration for latticed shell structures in frequency domain also in time domain. Byprogramming with waved superstition method combing with FFT technology,procedure of wind velocity is generated. The program is verified to be effective andleads to satisfied results. Time domain analysis is performed on the original one-layerlatticed shell roof structures of Beijing Laoshan Cycling Velodrome under randomwind load. Based on the comparison of the computed wind vibration coefficient andwind tunnel results, the correctness and validity of this method are to be verified. Thewind vibration coefficient of the two-layer latticed shell project has been calculatedthrough the same method, and the result can be referenced in practice. Eleven models in the same design condition and different span and ratio of riseto span is built, and their wind vibration coefficients are calculated separately. Basedon these results, some important conclusions can be obtained. The wind vibrationcoefficient is increased along with the enlargement of the span, ratio of rise to spanand the reduction of the stiffness. While, the coefficient is complicated to beconfirmed because many factors may have affection on the value, probably includingspan, ratio of rise to span, stiffness, mass, damping, boundary condition, frequency,height above the ground. It's necessary to research deeply to achieve a simple,accurate empirical quotation of wind vibration coefficient for double-layer latticedshell roof structures.