To gain understanding of the applicability of carbon fiber reinforced polymer (CFRP) cable in cable-supported bridges, based on the Runyang Bridge and Jinsha Bridge, a suspension bridge using CFRP cables and a cable-s...To gain understanding of the applicability of carbon fiber reinforced polymer (CFRP) cable in cable-supported bridges, based on the Runyang Bridge and Jinsha Bridge, a suspension bridge using CFRP cables and a cable-stayed bridge using CFRP stay cables are designed, in which the cable’s cross-sectional area is determined by the principle of equivalent axial stiffness. Numerical investigations on the aerodynamic stability of the two bridges are conducted by 3D nonlinear aerodynamic stability analysis. The results showed that as CFRP cables are used in cable-supported bridges, for suspension bridge, its aerodynamic stability is superior to that of the case using steel cables due to the great increase of the torsional frequency; for cable-stayed bridge, its aerodynamic stability is basically the same as that of the case using steel stay cables. Therefore as far as the wind stability is considered, the use of CFRP cables in cable-supported bridges is feasible, and the cable’s cross-sectional area should be deter-mined by the principle of equivalent axial stiffness.展开更多
Aiming at the seismic-resistant performance of cable-supported glass curtain walls,the methods for formulating nonlinear single degree of freedom system and calculating the nonlinear response spectrums are proposed. T...Aiming at the seismic-resistant performance of cable-supported glass curtain walls,the methods for formulating nonlinear single degree of freedom system and calculating the nonlinear response spectrums are proposed. Taking pretension effect in cables and geometrical nonlinearity into account,the nonlinear acceleration spectrums are calculated under given conditions,such as site and different seismic fortification intensities. The seismic design response spectrums are developed. During vibrating,varying period due to the influence of pretension effect in cables and geometrical nonlinearity drives the maximum period of plateau in nonlinear response spectrums to move towards the long period zone,and the maximum of seismic effect coefficient is larger than that of current seismic code. The theoretical analysis and the example demonstrate that using the nonlinear response spectrums is safe and economical.展开更多
矢量场可视化是科学计算可视化中最具挑战性的研究课题之一 .为了能在二维屏上直观显示三维矢量场 ,将基于纹理的 L IC方法拓展到三维矢量场可视化 ,通过设计稀疏线噪声纹理并配合斜坡卷积核提高Volum e L IC图象质量 ,显著增强空间深度...矢量场可视化是科学计算可视化中最具挑战性的研究课题之一 .为了能在二维屏上直观显示三维矢量场 ,将基于纹理的 L IC方法拓展到三维矢量场可视化 ,通过设计稀疏线噪声纹理并配合斜坡卷积核提高Volum e L IC图象质量 ,显著增强空间深度感 ,并采用光线投射直接体绘制方法生成 Volum e L IC图象 ;另外 ,针对循环动画的突兀现象 ,提出 HRCK(Hanninged Ram p Convolution Kernel)法生成流畅的 Volum e L IC循环动画 ;提出Volum e L IC Probe交互洞察三维矢量场内部信息 .通过实例表明 ,本文所提方法具有良好的可视化效果 ,交互方便 .展开更多
基金Project (No. 502118) supported by the Natural Science Foundation of Zhejiang Province, China
文摘To gain understanding of the applicability of carbon fiber reinforced polymer (CFRP) cable in cable-supported bridges, based on the Runyang Bridge and Jinsha Bridge, a suspension bridge using CFRP cables and a cable-stayed bridge using CFRP stay cables are designed, in which the cable’s cross-sectional area is determined by the principle of equivalent axial stiffness. Numerical investigations on the aerodynamic stability of the two bridges are conducted by 3D nonlinear aerodynamic stability analysis. The results showed that as CFRP cables are used in cable-supported bridges, for suspension bridge, its aerodynamic stability is superior to that of the case using steel cables due to the great increase of the torsional frequency; for cable-stayed bridge, its aerodynamic stability is basically the same as that of the case using steel stay cables. Therefore as far as the wind stability is considered, the use of CFRP cables in cable-supported bridges is feasible, and the cable’s cross-sectional area should be deter-mined by the principle of equivalent axial stiffness.
基金the National Natural Science Foundation of China (Grant No. 50478028).
文摘Aiming at the seismic-resistant performance of cable-supported glass curtain walls,the methods for formulating nonlinear single degree of freedom system and calculating the nonlinear response spectrums are proposed. Taking pretension effect in cables and geometrical nonlinearity into account,the nonlinear acceleration spectrums are calculated under given conditions,such as site and different seismic fortification intensities. The seismic design response spectrums are developed. During vibrating,varying period due to the influence of pretension effect in cables and geometrical nonlinearity drives the maximum period of plateau in nonlinear response spectrums to move towards the long period zone,and the maximum of seismic effect coefficient is larger than that of current seismic code. The theoretical analysis and the example demonstrate that using the nonlinear response spectrums is safe and economical.
文摘矢量场可视化是科学计算可视化中最具挑战性的研究课题之一 .为了能在二维屏上直观显示三维矢量场 ,将基于纹理的 L IC方法拓展到三维矢量场可视化 ,通过设计稀疏线噪声纹理并配合斜坡卷积核提高Volum e L IC图象质量 ,显著增强空间深度感 ,并采用光线投射直接体绘制方法生成 Volum e L IC图象 ;另外 ,针对循环动画的突兀现象 ,提出 HRCK(Hanninged Ram p Convolution Kernel)法生成流畅的 Volum e L IC循环动画 ;提出Volum e L IC Probe交互洞察三维矢量场内部信息 .通过实例表明 ,本文所提方法具有良好的可视化效果 ,交互方便 .
