Stability Analysis of Circular Steel Tube Cable-braced Grid Shells with Initial Imperfection

摘要

Cable-braced grid shell is new single-shell form that is preferable to structural characteristics of glass skylight. Due to the cross diagonal cables arranged in the grid plane, the whole structure becomes a hybrid structure with superior mechanical properties, which combines advantages of rigid structure and advantages of flexible structure. Through finite element analysis, a circular steel tube cable-braced grid shell that has a span of 50 meters and with initial imperfections, is taken as an example in the paper. Numerous effects on the stability of cable-braced grid shell, such as load distribution form, height-to-span ratio, cross-sectional area of component and prestressed cable, are taken into comparison. The main factors which have effects on the stability of cable-braced grid shell are demonstrated, as a practical research reference for the future development of cable-braced grid shell.