CFRP-铝合金组合管Keiwitt网壳的弹塑性稳定性

采用有限元方法研究碳纤维增强复合材料(CFRP)-铝合金组合管构成的Keiwitt网壳结构的弹塑性稳定性能,并与纯铝合金网壳进行对比。先通过组合管轴心受压的试验结果校验了有限元模型;再对CFRP-铝合金组合管构成的网壳进行全过程分析,其中考虑几何和材料非线性,获得了极限承载力,并研究矢跨比、初始缺陷和非对称荷载分布等参数对网壳稳定性能和极限承载力的影响;最后比较了组合管网壳与纯铝合金网壳的经济性。结果表明,组合管网壳的材料费用虽较高,但其承载力高,对几何缺陷和非对称荷载敏感性小,适合于建造大跨结构。

Elasto-plastic stability of Keiwitt latticed domes made of carbon fiber reinforced polymer-aluminum alloy composite pipes

The elasto-plastic stability of Keiwitt latticed domes made by carbon fiber reinforced polymer(CFRP)-aluminum alloy composite pipes is investigated using the finite element method.It was compared with the pure aluminum latticed domes.The finite element model of the composite pipes was verified by comparison with axial compressive test results.The complete loading process of the domes using composite pipes was then analyzed to get their ultimate capacity using nonlinear geometric and material effects.The model was used to analyze the influence of various parameters,including the rise-span ratio,initial imperfections,and unsymmetrical loads,on the stability and ultimate bearing capacity of the dome.Finally,the economics of latticed domes built using composite pipes and pure aluminum alloy pipes is compared.The results show that composite pipe latticed domes have higher loading capacities and less sensitivity to geometric imperfections and unsymmetrical loads although their material costs are more than that of pure aluminum alloy tubes.Hence,latticed domes made by CFRP-aluminum alloy composite pipes are suitable for long-span structures.