含层间界面的复合小梁疲劳性能影响因素的交互作用

发布时间：2018-01-09 22:16

本文关键词：含层间界面的复合小梁疲劳性能影响因素的交互作用　出处：《公路》2017年07期 　论文类型：期刊论文

【摘要】：为探讨在车辆荷载重复作用下,铺面材料疲劳性能的变化规律,采用含有层间界面的复合小梁进行四点弯曲疲劳试验。通过改变复合小梁的材料组合方式、黏层油类型及用量,以及应变水平等影响因素,测定复合小梁试件的疲劳寿命。结果表明:(1)对于双层均为密实型材料的复合小梁,各因素对其疲劳寿命的影响大小顺序为黏层油用量应变水平黏层油类型,对于上层为空隙型、下层为密实型的复合小梁,各因素影响顺序为应变水平黏层油用量黏层油类型;(2)随着上层沥青混合料空隙的增大,层间黏结性能下降,复合小梁疲劳寿命减小,而随着黏层油用量的增加,层间黏结性能先增后减,复合小梁的疲劳寿命也先增后减;(3)混合料级配类型及材料性质在影响复合小梁疲劳寿命的因素中居主导地位,SMA-13与SMAP-5的结构组合整体性最好,疲劳寿命最大;(4)确定了复合小梁疲劳寿命与黏层油用量之间的相互关系,并采取现象学法疲劳模型,建立疲劳寿命方程。
[Abstract]:In order to study the fatigue behavior of pavement materials under the repeated loads of vehicles, a four-point bending fatigue test was carried out with composite trabeculae with interlaminar interface. The material combination mode of composite trabeculae was changed. The fatigue life of the composite trabecular specimens was determined by influencing factors such as the type and amount of viscous layer oil and the strain level. The results show that the composite trabeculae with double layers are compacted. The influence of various factors on the fatigue life of the composite trabeculae is in the order of viscous layer oil content strain strain horizontal viscous layer oil type for the upper layer voids and the lower layer for dense trabeculae. The order of influencing factors is the type of strain horizontal viscous layer oil. (2) with the increase of the void in the upper layer of asphalt mixture, the interlaminar bonding performance decreases, and the fatigue life of the composite trabeculae decreases, while with the increase of the oil content of the adhesive layer, the interlaminar adhesion energy increases first and then decreases. The fatigue life of composite trabeculae increased first and then decreased. (3) mixture gradation type and material properties play a leading role in influencing the fatigue life of composite trabeculae. SMA-13 and SMAP-5 have the best structural integrity and the largest fatigue life. (4) the relationship between fatigue life of composite trabecular beam and the amount of viscous layer oil is determined, and the fatigue life equation of composite trabecular beam is established by using phenomenological fatigue model.
【作者单位】：西南交通大学土木工程学院;道路工程四川省重点实验室;中国水利水电第七工程局有限公司;
【基金】：国家自然科学基金项目,项目编号51378438 企事业科技合作项目,项目编号JHFDD-JSFW-001
【分类号】：U416.217
【正文快照】： 在铺面工程正常使用过程中,由于车辆荷载的反复作用,使其结构内部应力应变长期处于交迭变化的状态,致使路面容易发生疲劳破坏,疲劳破坏是沥青路面主要破坏方式之一[1-2]。众所周知,影响沥青路面疲劳因素繁多,探究沥青路面疲劳特性的侧重点也各异。文献[3]从沥青用量、摊铺等待

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