Dynamic response of the high‐rise steel tridimensional parking structure for vertical impact excitation of the lifting system

Abstract

For the vertical lifting high-rise steel tridimensional parking structure, the vertical impact excitation resulting from the repeated acceleration and deceleration of the lifting system is analyzed and obtained according to the operational mode of lifting system. The dynamic model of the parking structure is established, and the structural dynamic response for vertical impact excitation of the lifting system is analyzed by the finite element software ANSYS (Ansys Inc., Cecil Township, Pa, USA). Influence of various factors, such as the lifting height of the lifting cage, structural damping, parking case, speedup mode and abnormal operation of the lifting system, on the structural dynamic response is investigated, and the corresponding suggestions on vibration reduction and rational speedup mode are given. Finally, the structural dynamic buckling caused by vertical impact excitation of the lifting system is discussed. The results indicate that the maximum structural vibration response occurs in the acceleration stage after start of the lifting system and depends on the velocity pattern. Additionally, the lifting height and structural damping have not remarkable influence on the maximum structural vibration response. It is suggested that the vehicles be parked in the garage from bottom to top symmetrically, and the abnormal speedup or stop of the lifting system should be avoided. Yun SY, Hamburger RO, Cornell CA, et al. 2002. Seismic performance evaluation for steel moment frames. Journal of Structural Engineering 128(4): 534-545. Zhang RH, Soong TT. 1992. Seismic design of viscoelastic dampers for structural applications. Journal of Structural Engineering 118(5): 1375-1392.

Dynamic Response of Latticed Shell and Its Steel Column Supports under Impact Load

“…The yield strength fy is 235MPa, Young's modulus E is 2.1×10 5 MPa, plastic hardening modulus Et is 7.9×10 2 MPa, and lateral deformation coefficient ν is 0.3. The impact loads can be abstracted as triangular, sinusoidal, rectangular or oscillation pulse [22]. As suggested by Wang et al, a triangular impulse load was applied on the steel column supports of the lattice shell.…”