摘要
以某机场航站楼指廊为例,研究了弦支结构拉索索力测试的振动频率法。单跨索采用梁弯曲模型建立振动微分方程,根据拉索参数确定振动频率与索力的关系。研究表明:对于跨度较小、截面面积较大的拉索,需考虑抗弯刚度等参数的影响;采用加速度传感器实测拉索前三阶频率,根据频率与索力的关系公式计算出索力与油压表读数对比,误差最小为1.61%,吻合比较良好;根据多跨拉索的受力特点,采用MIDAS将拉索简化为多跨连续梁模型计算拉索前三阶频率,并与实测频率进行拟合,拟合后最小方差为0.856。研究结果对利用振动频率法测试弦支结构的索力具有一定的指导意义。
Take an airport terminal finger gallery as an examplem,the vibration frequency method of the force test of the string branch structure was studied.The beam bending model is used to establish the vibration differential equation,and the relationship between the vibration frequency and the cable force is determined according to the cable parameters.The study shows that:for the cable with small span and large section area,the influence of bending stiffness and other parameters should be considered.When the acceleration sensor is used to measure the first third order frequency of the cable,according to the relationship between the frequency and the cable force formula to calculate the cable force and the oil pressure meter reading comparison,the minimum error is 1.61%,the agreement is relatively good.According to the force characteristics of the multi-span cable,MIDAS was used to reduce the first third order frequency to the multi-span continuous beam model,and it was fitted to the measured frequency with a minimum variance of 0.856.The results have some significance for test the cable force of string branch structure by vibration frequency method.
作者
周春娟
袁晓明
刘彦
惠存
ZHOU Chun-juan;YUAN Xiao-ming;Liu Yan;Hui Cun(Shaanxi Architecture Science Research Institute Co.,Ltd.,710082,Xi'an,China;Zhongyuan University of Technology,450007,Zhengzhou,China;BCEG No.3 Construction Engineering Co.,Ltd.,100044,Beijing,China;Spatial Structures Research Center,Beijing University of Technology,100124,Beijing,China)
出处
《建筑技术》
2024年第21期2676-2679,共4页
Architecture Technology
基金
陕西省科技厅重点研发计划“两链”融合重点专项(2022LL-JB-13)。
关键词
弦支结构
振动频率法
索力测试
string branch structure
vibration frequency method
cable force test
