CFRP与钢组合斜拉索设计方案及理论研究

Design Schemes and Analysis of Composite Stay Cables with CFRP and Steel Materials

摘要:

提出两种碳纤维增强塑料(CFRP)与钢组合的斜拉索方案:CFRP与钢组合截面斜拉索,以及CFRP与钢组合结构斜拉索.前者发挥CFRP材料的优异性能，同时避免CFRP材料的锚固难题,两种材料的截面面积比为关键设计参数；后者将CFRP斜拉索与钢斜拉索在同一桥梁不同跨度区域分别应用,优化了整桥经济性能,不同材料斜拉索合理跨度区域的确定是其设计关键.采用解析解形式的参数分析,给出不同情况下关键设计参数的推荐数值,从理论上初步证明了两种方案替代传统钢斜拉索的可行性.

Abstract:

This paper presents two new schemes,the stay cables with carbon fiber-reinforced polymer (CFRP) and steel composite section and the stay cables with CFRP and steel composite structure.In the former scheme,the CFRP core remains the superior performance of CFRP materials,and the steel coat can provide protection for the CFRP core and excellent anchorage performance is therefore achieved.The ratio of the CFRP section area to the whole section area is determined as the key design parameter.The latter scheme,a cost efficient design,in which the CFRP stay cables and steel stay cables are applied to a bridge’s different spans.The proper values of key parameters are proposed based on a parametric study by means of the analytical solutions and the feasibility of the proposed stay cables is theoretically proved.The proposed stay cable is an ideal alternative to the traditional steel stay cable.