Research on Mechanical Performance of an Irregular Kiewitt Dome Structure

Kiewitt dome structure is commonly used in spatial structures, on which many researches have been carried out. However, few researches focus on irregular dome structure. The mechanical performance of an irregular Kiewitt dome structure, cut by two vertical planes from a semi-sphere dome structure to form two openings supported by beams for architectural gates, is studied. The analysis and comparison of the dome structures with the opening or not, as well as the parametric analysis of section of the supporting beam, are conducted by SAP2000. Finally, nonlinear analysis is done by ANSYS. The results show that the existence of openings decreases the integrity of the structure and the members near the opening need to be strengthened. The stiffness of the arch beam has great effects on the vibration characteristics, the axial force distribution of the members, and the buckling modes of the structure. Proper arch beam section is recommended to meet the requirement of the structure.