摘要
为分析单根吊索破坏是否会引起其余吊索的连续性破坏,并验算吊索安全系数的取值是否合理,以某在建自锚式悬索桥为例,利用通用有限元软件ANSYS建立全桥有限元模型,采用构件拆除法分析单根吊索断裂时周围吊索的静力和动力响应增量、内力及动力放大系数,进而探讨吊索安全系数取值。结果表明:单根吊索断裂对相邻吊索的静力和动力影响剧烈,动力效应显著;当吊索的安全系数减小为1.5时,边跨最短吊索断裂会引起同侧吊索的连续断裂,导致桥梁倒塌;该桥吊索安全系数取为3.0是合理的,能够确保单根吊索断裂时桥梁的强健性。
To analyze if the loss of a single sling of the self-anchored suspension bridge would cause progressive destruction to the remaining slings and to check if the value selected for the safety factor of the slings was rational, a self-anchored suspension bridge being built was taken as an example. The universal software ANSYS was used to set up the finite element model for the whole bridge of the example bridge, the static and dynamic response increment, the internal forces and dynamic amplification factors of the adjacent slings under the loss of a single sling were analyzed by the component removal method and the value for the safety factor of the slings was hence studied. The results of the analysis and study show that the impact of the loss of a single sling on the static and dynamic of the adjacent slings is violent and the dynamic effect is signifi- cant. As the value for the safety factor is reduced by 1.5, the loss of the shortest sling at side span will cause progressive destruction to the remaining slings on the same side and will result in the collapse of the bridge. It is rational that the value for the safety factor of the slings of the bridge should be 3.0 and the safety factor of such value can ensure the robustness of the bridge with the loss of a single sling.
出处
《桥梁建设》
EI
CSCD
北大核心
2014年第6期35-39,共5页
Bridge Construction
