RESEARCH ON STIFFNESS OF HUB-SHAPE INLAY JOINT AND BEARING CAPACITY OF SINGLE-LAYER SPHERICAL RETICULATED SHELL

The hub-shape inlay joint is a new type of assembled joint designed and developed in China, and has the advantages of convenient construction, smooth shape and high positioning accuracy, and it belongs to a typical semi-rigid joint. However, the research on this kind of joints is limited, and existing codes do not contain the relevant theoretical calculation formulas and design requirements for the semi-rigid single-layer spherical reticulated shell. Recognizing the aforementioned issues, a refined model of the hub-shape inlay joint is established by ANSYS package, and the moment-rotation curve of the joint is fitted based on the power function model. Meanwhile, the influence of joint stiffness on ultimate bearing capacity of the semi-rigid shell with different spans and rise-to-span ratios is discussed in detail. The results show that the moment-rotation curves of the hub-shape inlay joints in out-of-plane bending and torsional bending are in good agreement with the power function model. The sensitivity of the ultimate bearing capacity of shell to the bending stiffness of the joints is greater than the axial stiffness of the joints, and the sensitivity of the ultimate bearing capacity to the stiffness of the joints will get weaker with the increase of the span or rise-to-span ratio of the shell.