超高层建筑结构选型技术研究

Study on selection method of structural schemes of super tall building

对于超高层建筑的设计,往往有多个可供选择的结构方案。为了能够科学快速地选择出建筑功能、结构性能、抗震性能和经济性能等综合指标都能达到最满意的结构方案,本文基于模糊数学和层次分析法的原理采用模糊层次综合优选法来确定超高层建筑的结构方案。该法首先将影响超高层建筑结构方案选择的因素划分为包括目标层、准则层和指标层三部分的递阶层次结构,其中准则层因素分为静力性能、多遇地震下抗震性能和经济性能三类,指标层因素又细分为21个指标;然后给出了各指标的隶属函数,从而求出各指标的隶属度和指标层相对于准则层的权重集;最后根据模糊矩阵合成运算得出最终的综合评判结果。该法既避免反复试算造成的人力、物力资源的浪费,又避免了专家个人能力局限性的制约,具有重要的工程价值。

For the design of super tall building,there are usually several proposed structural schemes to be selected.The best structural scheme should be provided with the most rational technical index including mechanical behavior index,seismic behavior index,and cost-efficiency index.In order to achieve this scheme scientifically and rapidly,this paper presents the multilevel fuzzy comprehensive optimization method(MFCOM) based on fuzzy mathematics and analytical hierarchy process.Firstly,this method divides the influencing factors of structural scheme selection of super tall building into the multilevel structure,which includes three levels: goal level,rule level and index level.The rule level includes static behavior,the seismic behavior index of frequent level and economic performance.The index level includes twenty-one factors.The determination of membership function of each factor in index level is then presented,and then membership degree of each index and weight set of index level to rule level are derived.The fuzzy comprehensive evaluation result is finally obtained according to fuzzy matrix synthesized operation.This method can avoid repeating calculation which results in the excessive human and material resources,and can decrease the constraint of the personal competence of the specialist,and has important engineering value.