Analysis On Dynamic Behavior Of Kiewitt Single-layer Latticed Shells With C-joint

Recently, semi-rigid joint single layer reticulated domes have been the object of research for many scholars because of its advantages of easy construction, better mechanical characteristic and beautiful exterior. However, up to now, most studies focus on the static stability analysis of semi-rigid reticulated dome and studies focusing on dynamic characteristics of semi-rigid reticulated dome are deficient and so this dissertation will do study on dynamic characteristics of semi-rigid joint dome.Finite element model was built using ABAQUS and during analysis, both geometric and material nonlinearity were considered. Correct of this model was verified by comparing with results of test.Using the finite element model, taking the joint stiffness as the main parameter and taking the other structure parameters into consideration, such as ratio of rise to span, geometric nonlinearity, section of members, analysis of free vibration frequency and internal force of members under common earthquake were conducted.Difference of mechanical properties among diagonal members, radial members and circumferential was derived by parameter analysis of dynamic internal force for semirigid reticulated shell. Based on the above analysis, one method of obtaining the seismic force coefficient was derived. Influence of parameters, such as stiffness of joint, roof mass, ratio of rise to span, on the seismic internal force coefficient were studied. Based on the large calculated examples, seismic internal force coefficients under common earthquake were derived.Failure models and distinguished criterion were investigated under harmonic load and earthquake load. The mathematic model applied to distinguish failure model of semi-rigid joint reticulated dome was derived. At last, damaged model of semi-rigid joint reticulated shell was derived to evaluate the damaged degree of structure.Through study of this dissertation, finite element model for semi-rigid joint were built and one seismic design method of semi-rigid joint reticulated dome was derived. Seismic internal force coefficient was counted and then seismic internal force coefficient is provided for reference. Failure modes for semi-rigid reticulated shell were studied. Also, method of distinguishing failure mode and damaged model of semi-rigid joint single layer reticulated dome were set up.