基于模糊数学的STS管幕结构的连接参数优化

Optimization of Connection Parameters of Steel Tube Slab Structures Based on Fuzzy Mathematics

依托STS管幕结构纵向抗弯性能试验,建立了STS管幕构件纵向抗弯性能有限元分析模型并验证了模型的可行性.采用正交试验研究了钢管壁厚、钢管直径、螺栓直径、钢管间距、翼缘板厚度对构件纵向抗弯承载力、跨中位移和经济性指标的影响,结合模糊数学理论优化了连接参数.结果表明:对构件达到屈服荷载时跨中位移影响最大的参数为钢管直径,对构件纵向抗弯承载力和每延米构件材料平均价格影响最大的参数为钢管壁厚.为兼顾安全性和经济性,连接参数比值应为钢管直径∶钢管壁厚∶螺栓直径∶钢管间距∶翼缘板厚度=1∶0.03∶0.05∶1.15∶0.02.

A finite element model of the standard STS specimen was established on the basis of laboratory tests on longitudinal bending performance,then the model’s feasibility was verified.The influence of the wall thickness and diameter of pipe,the bolt diameter,the spacing between pipes and the flange plate thickness on the longitudinal flexural bearing capacity,the mid-span deformation under the yield load and the specimen’s average price per meter was studied by orthogonal test,and the parameters of STS specimen were optimized by fuzzy mathematics.The results indicate that the pipe diameter has the greatest influence on the mid-span deformation under the yield load,and the pipe thickness has the greatest influence on the longitudinal flexural bearing capacity and the specimen’s average price per meter.To meet the safety and economy,the ratio of parameters is suggested to be,the pipe diameter∶the pipe thickness∶the bolt diameter∶the spacing between pipes∶the flange thickness=1∶0.03∶0.05∶1.15∶0.02.