摘要
通过引入一端铰支一端固支、两端固支等不同边界条件下吊杆的形状函数,运用能量方法。推导出索力、抗弯刚度与吊杆固有频率间的关系式,进而给出基于前2阶固有频率的索力精确测量公式。该公式将抗弯刚度作为隐式计算参数,回避了其难以准确识别的问题。以某系杆拱桥的索力实测为例,将建议公式与常用公式的计算结果和实测值进行比较并加以分析,分析结果证明建议公式准确考虑了抗弯刚度和边界条件对索力测量的影响且其精度满足工程实践要求。
By introducing shape functions under different boundary conditions, including one end simply supported and the other fixed, two ends fixed, etc., the relational expression between tension, flexuml rigidity and natural frequency was deduced with energy method. Then, the precise metrical formula of tension based on the first and second order natural frequency was proposed. The proposed formula takes flexural rigidity as implicit parameter and avoids the problems in identifying. Taking tension measurement of one tied arch bridge as example, the results of proposed formula and common formulas as well as actual results were compared and analyzed. It indicates that flexural rigidity and boundary conditions which influence the precision of tension measurement are considered accurately in the proposed formula and the precision of proposed formula can meet the needs of engineering practice.
出处
《公路交通科技》
CAS
CSCD
北大核心
2008年第6期87-91,98,共6页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
索力精确测量公式
能量法
系杆拱桥
抗弯刚度
边界条件
bridge engineering
precise metrical formula of tension
energy method
tied arch bridge
flexuml rigidity
boundary condition
