以非线性数值计算为手段,对比分析缆索系统、加劲梁、桥塔及支承系统等结构系统,研究表明主跨3 500 m CFRP主缆悬索桥具有技术可行性。利用精细有限元结构仿真分析手段,对主跨3 500 m CFRP主缆悬索桥结构体系进行参数敏感性分析,研究结...以非线性数值计算为手段,对比分析缆索系统、加劲梁、桥塔及支承系统等结构系统,研究表明主跨3 500 m CFRP主缆悬索桥具有技术可行性。利用精细有限元结构仿真分析手段,对主跨3 500 m CFRP主缆悬索桥结构体系进行参数敏感性分析,研究结构参数对超大跨径悬索桥静、动力性能影响,结合结构系统数值模型分析研究,确定了主跨3 500 m CFRP主缆悬索桥最优结构体系。建立物理模型,进行CFRP主缆索股的锚固、滑移、弯折等理论分析及静载、疲劳试验研究。研发了可用于实桥的黏结性锚具,锚固效率系数达100%。验证了抗滑移、弯折性能,在鞍座处摩擦系数约0.5,在索夹处达0.331,在鞍座处的弯曲强度超过其抗拉强度的90%,在索夹处几乎不存在弯折问题。以研究成果为依据,进行了主跨3 500 m CFRP主缆悬索桥原型设计。展开更多
The feasibility of longer spans relies on the successful implementation of new high-strength light weight materials such as carbon fiber reinforced polymer(CFRP). First, a dimensionless equilibrium equation and the co...The feasibility of longer spans relies on the successful implementation of new high-strength light weight materials such as carbon fiber reinforced polymer(CFRP). First, a dimensionless equilibrium equation and the corresponding compatibility equation are established to develop the cable force equation and cable displacement governing equation for suspension cables, respectively. Subsequently, the inextensible cable case is introduced. The formula of the Irvine parameter is considered and its physical interpretation as well as its relationship with the chord gravity stiffness is presented. The influences on the increment of cable force and displacement by λ2 and load ratio p′ are analyzed, respectively. Based on these assumptions and the analytical formulations, a 2000 m span suspension cable is utilized as an example to verify the proposed formulation and the responses of the relative increment of cable force and cable displacement under symmetrical and asymmetrical loads are studied and presented. In each case, the deflections resulting from elastic elongation or solely due to geometrical displacement are analyzed for the lower elastic modulus CFRP. Finally, in comparison with steel cables, the influences on the cable force equation and the governing displacement equation by span and rise span ratio are analyzed. Moreover, the influences on the static performance of suspension bridge by span and sag ratios are also analyzed. The substantive characteristics of the static performance of super span CFRP suspension bridges are clarified and the superiority and the characteristics of CFRP cable structure are demonstrated analytically.展开更多
文摘以非线性数值计算为手段,对比分析缆索系统、加劲梁、桥塔及支承系统等结构系统,研究表明主跨3 500 m CFRP主缆悬索桥具有技术可行性。利用精细有限元结构仿真分析手段,对主跨3 500 m CFRP主缆悬索桥结构体系进行参数敏感性分析,研究结构参数对超大跨径悬索桥静、动力性能影响,结合结构系统数值模型分析研究,确定了主跨3 500 m CFRP主缆悬索桥最优结构体系。建立物理模型,进行CFRP主缆索股的锚固、滑移、弯折等理论分析及静载、疲劳试验研究。研发了可用于实桥的黏结性锚具,锚固效率系数达100%。验证了抗滑移、弯折性能,在鞍座处摩擦系数约0.5,在索夹处达0.331,在鞍座处的弯曲强度超过其抗拉强度的90%,在索夹处几乎不存在弯折问题。以研究成果为依据,进行了主跨3 500 m CFRP主缆悬索桥原型设计。
基金Project(2010-K2-8)supported by Science and Technology Program of the Ministry of Housing and Urban Rural Development,ChinaProject supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions,China
文摘The feasibility of longer spans relies on the successful implementation of new high-strength light weight materials such as carbon fiber reinforced polymer(CFRP). First, a dimensionless equilibrium equation and the corresponding compatibility equation are established to develop the cable force equation and cable displacement governing equation for suspension cables, respectively. Subsequently, the inextensible cable case is introduced. The formula of the Irvine parameter is considered and its physical interpretation as well as its relationship with the chord gravity stiffness is presented. The influences on the increment of cable force and displacement by λ2 and load ratio p′ are analyzed, respectively. Based on these assumptions and the analytical formulations, a 2000 m span suspension cable is utilized as an example to verify the proposed formulation and the responses of the relative increment of cable force and cable displacement under symmetrical and asymmetrical loads are studied and presented. In each case, the deflections resulting from elastic elongation or solely due to geometrical displacement are analyzed for the lower elastic modulus CFRP. Finally, in comparison with steel cables, the influences on the cable force equation and the governing displacement equation by span and rise span ratio are analyzed. Moreover, the influences on the static performance of suspension bridge by span and sag ratios are also analyzed. The substantive characteristics of the static performance of super span CFRP suspension bridges are clarified and the superiority and the characteristics of CFRP cable structure are demonstrated analytically.
