摘要
根据悬索桥主塔从裸塔、主缆施工、主梁吊装到成桥不同阶段的受力特点,将悬索桥主缆对 主塔的约束作用简化为不同等效约束刚度的弹簧,利用静力法推导了带有弹簧约束的主塔模型稳 定临界力计算公式,并给出中、边跨主缆约束刚度的计算公式及主缆对塔约束刚度的计算方法。针 对不同阶段的主缆约束刚度,该计算公式能在裸塔及主缆约束刚度无穷大时与悬臂压杆、一端铰支 一端固定压杆的稳定计算公式相吻合,表明该计算公式较准确地反映了悬索桥施工、成桥各阶段主 缆对主塔的约束作用和计算公式的正确性。算例表明该方法简便易行。
According to the characteristic of main tower in the suspension bridge from single tower, main cable and girder construction to final stage, the equivalent restraint stiffness k is utilized to simplify the main cable constraint to the main tower, and the model is developed to simulate the constraint of the main cable to the tower during different stage. The equation for calculating critical force of main tower with spring restraint is derived by static mechanics, it accords with the critical force formula in material mechanics at limit state. And the restraint stiffness k of side span and main span are also given. An example indicates that the method is easy for engineering application.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2005年第1期41-43,47,共4页
Journal of Chang’an University(Natural Science Edition)
关键词
桥梁工程
悬索桥
主塔
稳定分析
等效约束刚度
bridge engineering
suspension bridge
main tower
buckling analysis
equivalent restraint stiffness
