The Research On Structure Selection And Optimization Based On Sensitivity Analysis For High-rise Residence

The features of high-rise residence are high similarity and repetition rate.In optimization of these buildings,the flows consisting of first classification and then optimization on single type of structure are better,which will also enlarge the optimization effect.Structure design is a system engineering problem as well as structure optimization which are not merely consisted of topological and size optimization.Processes including type selection,topological and size optimization should be taken into account for systematic structure optimization.This article is focused on the research of structure optimization of high-rise residence.The research is carried out from two points of view about type selection and optimization based on sensitivity,considering the weakness that the work of type selection are always simplified or neglected,and optimization based on algorithm are not convenient in practice.The main researches are listed as follows:1)A decision model is proposed on high-rise residence structure.A decision criteria system is built.The criteria properties of both qualitative and quantitative indexes are identified by triangular fuzzy number and fuzzy membership separately.A decision model introducing TOPSIS is built to select optimum structure type of high-rise residence.And the feasibility of model is checked by an example.2)A selection model is proposed about foundation selection concerning preference on single alternative.The necessity of preference on single alternative is analyzed.A decision criteria system is built.The criteria properties are identified by methods from chapter 2.The relational grade theory is introduced in solving the issue of selection concerning preference on single alternative,using methods proposed in chapter 2.A decision model solving above issue is proposed.And the feasibility is checked by an example.3)An approximate algorithm is derived in consideration of stricture torsion based on energy theory.The feasibility of algorithm is checked by an example.Analytic method is used to demonstrate the fact that the strain energy of high shear wall structure under lateral loads mainly consist of three parts,namely bending and shear strain energy of wall-column and bending strain energy of lintel beam.The algorithm will be benefit for derivation of objective functions,which will be convenient for optimization model4)A model about coordination optimization is proposed as well as solution.The model is developed based on sensitivity analysis,combined with the characteristic of coordination optinization,and focused on modified paces of sensitivity.Two concepts,relative sensitivity and amplitude ratios of sensitivity,are defined to assist model solution.The expressions of sensitivity are given on main performance function of shear wall structure.5)A model of multi-level objective to be optimized is proposed based on sensitivity,analyzing characteristic of most optimization problems.The solution is given using defined new concepts,combining with relational grade theory.The feasibility of model is checked by an example.6)Sensitivity analysis of two indiexes,span-depth ratio of lintel beam and length ratio of lintel beam and wall column to energy dissipation of shear wall,is given It is focused on energy dissipation of shear wall under the elastic-plastic performance.The sensitivity results can be referred by elastic-plastic optimization.Perform-3D is served as main tool in energy dissipation analysis.66 models with elastic-plastic fiber are built(average 39 fibers are setting for every model),330 groups of elastic-plastic analysis under earthquake have been finished.15 models(75 groups of analysis)are used to demonstrate the fact that the elastic-plastic performance will be optimum when two shear wall legs is of the same length.51 models(255 groups of analysis)are used to research sensitivity of span-depth ratio of lintel beam and length ratio of lintel beam and wall column to energy dissipation of shear wall.It is showed from the results that the larger of span-depth ratio,the greater of dissipation energy;the larger of length ratio of lintel beam and wall column,the weaker of dissipation energy.Nevertheless,the absolute value of sensitivity result is maximum when span-depth ratio is around 5.0,and the absolute value of sensitivity result is minimum when length ratio of lintel beam and shear wall leg is around 1.0.