斜向预应力混凝土道面局部锚固区力学性能试验研究  

Research on Mechanical Performance of Local Anchorage in Cross-Tensioned Concrete Pavement

作　　者：蒙朝美 王观虎[2] 沈勇 刘睿 叶晖 MENG Chaomei;WANG Guanhu;SHEN Yong;LIU Rui;YE Hui(Unit 95979,Taian 271207,Shandong,China;Aviation Engineering School,Air Force Engineering University,Xi’an 710038,China)

机构地区：[1]95979部队,山东泰安271207 [2]空军工程大学航空工程学院,西安710038

出　　处：《空军工程大学学报》2025年第1期119-126,共8页Journal of Air Force Engineering University

摘　　要：斜向预应力混凝土道面充分利用预应力筋的抗拉强度使水泥混凝土道面在承受荷载前处于双向受压状态,从而有效提高混凝土道面的承载力与耐久性。基于斜向预应力混凝土道面局部锚固区应力复杂的特点,开展了斜向预应力混凝土道面模型试验,实测了局部锚固区纤维混凝土预制模块在预应力筋作用下的力学响应,分析了U形缺口形状对预制模块力学响应的影响效应。结果表明局部锚固区在预应力筋的作用下处于复杂受力状态,对称受拉时锚固区U型缺口顶部预应力筋所在截面的实测拉应变最大;U形缺口形状对预制模块实测应变影响较显著,梯形预制模块结构简单、重量较轻,但存在应力集中现象、力学性能较差,大倒角预制模块消除了应力集中现象,力学性能好,但预留空间大,预制结构较重,小倒角的预制模块的力学性能和工艺性能介于梯形和大倒角形之间;相邻预制模块拼接缝隙显著增大了预制模块的实测应变,对称受拉是预制模块最不利的受荷条件,在预应力筋张拉前应对拼接缝隙进行注浆处理,以改善预制模块的受力条件。The cross-tensioned concrete pavement is for the tensile strength of pre-stressed tendon to be utilized fully for making concrete pavement in a state of bi-directional compression prior to bearing vehicle loading and environmental effect by tensioning cross-strands,significantly enhancing bearing capacity and durability of concrete pavement.The model test is conducted to get mechanical performance of local anchorage in cross-tensioned concrete pavement based on its complicated distribution of stress,following by discussing influence of shape of U-shaped notch in prefabricated modules on measured strain.The results show that the local anchorage is in a complicated stress state under action of tensioning of cross-strands.The measured tensile strain reaches its maximum value at the top of U-shaped notch in the section where the tensioning cross-strands locate under action of symmetric tensioning.Additionally,the shape of U-shaped notch has apparently influence on measured strain.The trapezoidal prefabricated modules have simple structure and light weight,but poor mechanical performance owing to phenomenon of stress concentration.While prefabricated modules with larger angle of chamfer are good in mechanical performance,but heavier weight.The prefabricated modules with smaller angle of chamfer simultaneously have better mechanical performance and lighter weight.Furthermore,the gap between adjacent prefabricated modules obviously makes the measured strain on increase,and symmetric tensioning is the most unfavorable loading condition for prefabricated modules.Therefore,the gap between adjacent prefabricated modules should be dealt with grouting before tensioning of cross-strands to decrease tensile strain.

关 键 词：斜向预应力混凝土道面 局部锚固区 力学性能 预制模块 U形缺口形状 

分 类 号：U416.216[交通运输工程—道路与铁道工程]