Sensitivity Data-driven Optimization of Coupling Trusses Section of Multi-petal Supertall Building under Period Constraint

<p>Coupling trusses are efficient subassemblies in the lateral structure system of the multi-petal supertall tower. However, the thicker the steel chord of the coupling truss, the higher steel Z- direction performance and technical requirements for production and processing carried out, which also cause the heavier joint weight resulting in construction and hoisting difficulties. In this paper, the structural system of a 460m-high multi-petal tower is decomposed by multiple levels. Multiple sections of members are set as single-factor variables and sensitivity analysis is used to study the variable's contribution to period control. The optimization strategies under different steel thickness control standards of coupling truss were developed, and the truss plate thickness was optimized with the minimum increase of material cost and building space cost under the structure period constraint. The applicability and efficiency of the optimization strategy based on incremental sensitivity analysis were verified in dealing with similar engineering problems.</p>