摘要
为了研究预应力活性粉末混凝土(RPC)道面板的力学性能,为预应力活性粉末混凝土道面板的疲劳性能试验提供数据参考,并为预应力活性粉末混凝土道面板在机场道面工程中的应用提供理论依据,以预应力为变量,对预制的普通RPC道面板和预应力RPC道面板进行静力抗弯试验,分析比较道面板的抗弯、抗裂等力学性能及施加200 kN的预应力对其力学性能的影响程度。静力抗弯试验采用逐级加载的方法在2个道面板上施加竖向的集中荷载,直至道面板发生破坏。最终得到了跨中混凝土应变、预应力筋跨中应变与道面板跨中挠度随荷载变化的曲线。试验结果显示:施加200 kN预应力的RPC道面板比普通RPC道面板的极限荷载提高66%,跨中拉应变提高105%,极限挠度提高74%,延性系数提高36%,表明施加200 kN的预应力可以大幅度地提高RPC道面板的抗弯性能、抗裂性能以及延性。使用ABAQUS有限元模拟软件进行有限元分析。发现数值模拟得到的各曲线与试验测得的各曲线吻合程度较高,从而验证了有限元分析方法的可靠性。在此基础上,使用200 kN的预应力RPC道面板模型进行了机场道面工况的有限元模拟研究。发现在分别承受3种不同的飞机荷载时预应力RPC道面板可以稳定地保持在弹性工作阶段。表明预应力RPC道面板具有良好的工程使用价值。
In order to study the mechanical properties of RPC pavement slabs,provide data a reference for the fatigue performance test of prestressed RPC pavement slabs and a theoretical basis for its application in airport pavement projects,with prestress as a variable,the static flexural test on prefabricated ordinary RPC pavement slabs and prestressed RPC pavement slabs is carried out to analyze and compare their mechanical properties such as flexural and crack resistance properties as well as the influence of 200 kN prestress on their mechanical properties.In the static flexural experiment,a step-by-step loading method is used to apply vertical concentrated load on 2 pavement slabs until the pavement slabs are damaged.Finally,the curves of strain of concrete,strain of prestressed rebars and deflection of pavement slab in mid-span varying with load are obtained.The test result shows that(1) compared with ordinary RPC pavement slabs,the ultimate load of the RPC pavement slabs with 200 kN prestress is increased by 66%,the mid-span tensile strain is increased by 105%,the ultimate deflection is increased by 74%,and the ductility coefficient is increased by 36%,indicating that the exerting of 200 kN prestress can significantly improve the bending resistance,crack resistance and ductility of the RPC pavement slabs.The FEA is carried out by using ABAQUS FE simulation software.It is found that the curves obtained by numerical simulation are in good agreement with the curves measured in the experiment,which verified the reliability of the FEA method.On this basis,the FE simulation study on airport pavement conditions is carried out by using the 200 kN prestressed RPC pavement slab model.It is found that the prestressed RPC pavement slab can stably maintain the elastic working stage when subjected to 3 aircraft loads,indicating that the prestressed RPC pavement slab has good engineering value.
作者
阎西康
温家鹏
杜闯
周明
杜二伟
YAN Xi-kang;WEN Jia-peng;DU Chuang;ZHOU Ming;DU Er-wei(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;Shaanxi Highway Transport Technology Development Consulting Company,Xi’an Shaanxi 710054,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2022年第2期20-29,48,共11页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金项目(51878240)
天津市企业科技特派员项目(19JCTPJC56400)。
关键词
道路工程
抗弯性能
静力抗弯试验
活性粉末混凝土道面板
预应力
有限元分析
road engineering
flexural performance
static flexural experiment
prestressed reactive powder concrete(RPC)pavement slab
prestress
FEA
