Stability Performance Analysis To Landmark Tower Of Yantai

Landscape tower for yantai as a landmark landscape architecture in yantai development zone, its whole structure by bottom eight pillar of large Angle and up the casing outside the department frame etc. Abnormity of complex structural system, the structure arrangement, belongs to the structure of complex overrun. The current specification for the design of the structure stability method can not meet the needs of the stability of the structure design. To comprehensively consider the effect of various actual factors, to designed the special stability to further optimize the structure design, strengthen the weak parts of the structure,lt is necessary to improve the stability of the structure bearing capacity.Based on SAP2000 established landscape tower of yantai finite element model, by the buckling analysis, P - △ effect analysis, geometrical nonlinear stability analysis, the stability of the structure discussed in-depth study, the results show that:(1) In linear buckling analysis, whole structure introduced the first X to bend flexion, following after Y to flexural buckling and local buckling component, the first order buckling mode characterized by overall bending instability, large inclined column buckling lags behind the overall structure of the buckling. The structure of the eigenvalue buckling factor more than 10, shows that the structure has good stability.(2) Under the effect of horizontal wind load P - △ effect analysis, the structure of the vertex displacement increment greater than 10%, the effect of P - △ cannot be ignored.(3) In geometric nonlinear analysis, the casing outside the cylinder, brace first yield, show the good yield mechanism. The overall structure of the critical load coefficient is than 5, show that the structure has good nonlinear stability.(4) Structure of the overall stability limit bearing capacity is not sensitive to influence the cross section of inclined column,the impact on the stability limit bearing capacity is not obvious, It is not the way of inclined column section is increased by improving the stability of the whole structure performance.(5) Column support arrangement has obvious impact on the bearing capacity of structure stability. In the weak parts of the structure reasonable decorate support can effectively improve the ultimate bearing capacity of structure stability.(6) The connection between the outer frame tube and inner frame short beam line stiffness has a large effect on stable structure. With the increase of short beam line stiffness, the casing outside the cylinder increases the role of participation in the overall portfolio, the structure of the whole lateral stiffness. Analysis shows that short beam line stiffness between in (0.265～ 0.318) x106KN. m, the stability of the bearing structure with good performance; Within short beam and frame, the connection between the outer frame tube way influence on the performance of the structure stability, when connected to pin or semi-rigid connection structure of the second order effect is greater than the node is just answer when the second-order effect of structure, cannot be ignored. Must strengthen the node connection rigidity in structure design, otherwise it will overestimate the stability bearing capacity of structure.(7) The global stability of the structure is not sensitive to geometric imperfection.