波形钢腹板组合梁体外预应力筋模型试验及建议公式  

Model test and suggested formula of external prestressed tendons of corrugated steel web composite beams

作　　者：曹洪亮 李广昊 陆小蕊 高华睿 CAO Hongliang;LI Guanghao;LU Xiaorui;GAO Huarui(Shandong Gaoguang Expressway Group Co.,Ltd.,Binzhou 256600,China;Department of Civil Engineering,Shandongjiaotong University,Jinan 250023,China;Geotechnical and Structural Engineering Research Center of Shandong University,Jinan 250061,China)

机构地区：[1]山东高广高速公路有限公司,滨州256600 [2]山东交通学院土木工程系,济南250023 [3]山东大学岩土与结构工程研究中心,济南250061

出　　处：《建筑结构》2022年第6期119-125,共7页Building Structure

基　　金：山东省高等学校科技计划项目(J15LG02)。

摘　　要：为研究波形钢腹板组合梁受弯破坏过程中弹性阶段体外预应力增量的影响因素和计算方法,验证了基于光纤的智能预应力钢绞线在桥梁工程中应用的可行性和优越性,基于光纤光栅智能钢绞线技术对波形钢腹板组合梁模型开展试验研究。考虑了荷载形式、剪切变形和二次效应,推导了弹性阶段适用于波形钢腹板组合梁的体外预应力筋应力增量的计算公式。研究结果表明:公式计算结果与试验结果吻合较好;在弹性阶段,二次效应对弹性阶段体外预应力增量的影响为0.2%,可以忽略不计;光纤光栅传感器和振弦式压力传感器测量的锚下预应力-荷载的发展规律相同,测试数据的误差最大值为4.01%,证明了光纤光栅智能钢绞线技术在工程应用中的可行性和准确性;光纤光栅智能钢绞线技术不仅具有传统钢绞线优异的力学指标和优良的感知性能,而且突破了振弦式传感器监测测点少的局限性,所以光纤光栅智能钢绞线技术比振弦式压力传感器更具优越性。In order to study the influencing factors and calculating methods in the elastic stage prestressed increment of prestressed tendons in corrugated steel web composite beam under bending failure process. The feasibility and superiority of the application of intelligent prestressed steel strand based on optical fiber in bridge engineering were verified. Based on the technology of fiber grating fiber grating intelligent steel strand and the model of corrugated steel web composite beam, the experimental research was carried out. Considering the load form, shear deformation and secondary effect, the calculation formula of stress increment of external prestressed tendon for corrugated steel web composite beam in elastic stage was deduced. The results show that the calculating results are in good agreement with the experimental results. The effect of second-order effect on external prestressing increment of the elastic stage is 0.2%, which could be ignored. The development law of effective prestressed-load measuring by fiber grating sensor and vibrating string pressure sensor is same, and the maximum error of test data is 4.01%. The feasibility and accuracy of fiber grating intelligent steel strand technology in engineering application are proved. Fiber grating intelligent steel strand technology not only has the traditional steel strand excellent mechanical indicators and excellent perceptual performance, but also breaks through the limitation of fewer monitoring points of vibrating string sensor, so the fiber grating intelligent steel strand technology is more advantageous than vibrating string pressure sensor.

关 键 词：波形钢腹板组合梁 预应力筋 光纤光栅智能钢绞线 二次效应 应力增量 

分 类 号：TU398.1[建筑科学—结构工程]