基于位移影响矩阵的高铁站房混凝土框架结构预应力损失计算方法  

Calculation Method of Prestressing Loss in Concrete Frame Structure of High-speed Railway Station Buildings Based on Displacement Impact Matrix

作　　者：曾月 丁峰 赵一超 卓彪 刘艳辉[1] ZENG Yue;DING Feng;ZHAO Yichao;ZHUO Biao;LIU Yanhui(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2021年第1期115-121,共7页Railway Standard Design

基　　金：国家自然科学基金面上项目(51378427);国家重点研究课题(2016YFC0802205-9)。

摘　　要：预应力混凝土框架结构被广泛应用于高铁站房,由于预应力的损失可能导致结构存在一定的安全隐患和服役风险,能即时准确获取构件预应力损失程度,对判断站房的使用安全性是至关重要的。为计算该结构预应力筋的预应力损失程度,基于位移影响矩阵原理,建立预应力损失程度与结构中梁监测点处位移变化值之间的关系方程,提出一种计算该结构预应力筋预应力损失程度的方法。研究表明:该方法能较精确地计算出预应力筋的损失程度,可用于高铁站房预应力混凝土框架结构的预应力损失监测。当单位预应力损失量为25%时,计算得到的预应力损失程度误差最小。预应力混凝土框架结构的梁跨中位置的位移变化对计算预应力损失的敏感性最好。主梁发生预应力损失时,会使与之相连的次梁监测点处位移发生变化;次梁发生预应力损失时,对其他梁监测点处的位移无影响。Prestressed concrete frame structures are widely used in high-speed railway station buildings.The loss of prestressing may result in some security risks for the structures.The timely and accurate identification of prestressing loss is very important for judging the safety of station buildings.By establishing a relationship between the degree of prestressing loss and the change of displacement at the monitoring point of the beam,a method of calculating the degree of prestressing loss of the prestressed tendons is proposed based on displacement impact matrix.The study shows that this method can accurately calculate the prestressing loss of tendons,and it can be used to monitor the prestressing loss of prestressed concrete frame structures.When the unit prestressing loss is 25%,the calculating error is the smallest.The displacement change at the mid-span of the beam is most sensitive to calculate the prestressing loss.The prestressing loss in the main beam will change the displacement at the monitoring point of the connected secondary beam.When it occurs in the secondary beam,it has no impact on the monitoring point of other beams.

关 键 词：高速铁路 铁路站房 预应力混凝土框架结构 结构变形 位移影响矩阵 单位预应力损失量 预应力损失程度 

分 类 号：TU378.4[建筑科学—结构工程] U291.6[交通运输工程—交通运输规划与管理]