The force control of suspension bridge anchorage cable is the main contents which will be researched . according to the character of suspen - sion bridge anchorage , three questions is solved in this paper on the basis of the construction control experience of the highway bridge of yichang yanzhi river . firstly , an effective method of cable force control is presented in this paper , which has settled the puzzle of cable force accurate operate through fixing a pressure transducer at the behind of the hydraulic jack . secondly , an exactitude calculation model is founded in this paper . in addition the influence of boundary condition , sag , inclination , flexural rigidity and environment temperature to the cable vibration frequency which make the frequency method could be used to the measurement of cable force . in the end of this paper , a control system of anchorage cable force is developed on the basis of the above research . this system is very steady , credible , high precision and convenient . it is a new and credible method to be used to the force control of sus - pension bridge anchorage cable . in this paper , the conundrum of cable force control has been solved . the fruits are very useful to the development of inland suspension bridge 提出了一种有效可行的锚跨张力控制方法,即通过在油压千斤顶后加压力传感器,并利用单片机技术进行数据采集,解决了悬索桥锚跨索股初张力精确控制的难题;建立了锚跨索股索力的精确计算模型,分析了索股的边界条件、斜度、垂度、抗弯刚度及环境温度对索股频率的影响,解决了弦振法在大跨径悬索桥索力测试中的应用问题;在上述研究成果的基础上,研制出了锚跨张力控制系统,该系统具有稳定可靠,精度高,使用方便等特点,它的投入使用将为我国今后大跨径悬索桥锚跨张力控制提供一种全新的、可靠的手段。
The precision ( or quality ) of main cable erection depends to a great extent on that of datum strand erection while the precision of the datum strand erection in turn mainly depends on the determination method of sag modified quantity of the datum strand under condition of erection ( usually a condition of non - datum state ) and the construction control method for the strand when it is just to meet the modified sag 摘要主缆的架设精度(或架设质量)在很大程度上取决于基准索股的架设精度,而基准索股的架设精度主要取决于架设条件下(一般为非基准状态)基准索股架设垂度修正量的确定和达到修正垂度的控制方法。
By fully analysis of two real cable - stayed bridges , following conclusions have been reached : 1 ) under dead loads the sag of inclined cable stayed is the main point of geometric nonlinear behaviors of cable - stayed bridges , and the effects of the interaction of large bending and axial deformation in bending members and the large displacement are relatively small 通过理论分析和实例计算,本文得出以下结论: 1 )在恒载作用下,斜拉索的垂度效应是几何非线性的主要来源,组合效应、大变形效应的影响相对较小,若仅仅进行线性分析,则计算所得结果的误差会很大。
Firstly based on reading many literatures , the development history and present situation of csmss is introduced and an explicit definition of csmss is defined . the nonlinear finite element method equations are presented in detail , considering the orthotropic material property of the membrane and the wrinkled or relax properties of elements 详细推导了索杆膜空间结构的几何非线性公式,并且针对膜材的正交各向异性特性、膜材的褶皱、索的自重垂度、索的松弛等问题采取了相应的有效实用的计算方法。
The main work of this thesis includes : 1 . using energy theory , the cable sag and bending stiffness effects are investigated on the determination of cable tension forces through cable ' s fundamental frequency . based on the curve fitting , the practical formulas are proposed where the cable tension can be easily estimated using measured fundamental frequency 本文的主要工作包括: 1 .考虑拉索的垂度和抗弯刚度对基频的影响,用能量的方法,并辅以曲线拟合,提出了由基频计算索力的实用公式,公式与理论解的误差在以内,并对公式的适用范围进行了讨论。