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409-道路基层力学经验模型及对路用性能的影响&New Damage, Healing and Aging Framework for Asphalt Roads
  发表时间:2019-05-25  阅读次数:311

道路基层力学经验模型及对路用性能的影响

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主讲人:罗雪 特聘研究员

邀请人:朱兴一

时间:2019年5月29日(周三)9:00-11:00

地点:交通运输工程学院211会议室

主讲人简介

    罗雪,主要从事道路与材料工程的教学和科研工作,研究方向包括道路材料性能试验技术和分析方法、路面性能退化及灾变预测与评估、沥青混合料和路面新型设计方法、以及道路快速无损检测技术等,发表期刊及会议论文40余篇(SCI论文30余篇),国际学术会议论文演讲30余次,目前任美国土木工程师协会、全美改性沥青协会、国际道路联合会、以及美国沥青技术协会会员,同时担任SCI期刊Advances in Civil Engineering客座主编和Journal of Transportation Engineering, Part B: Pavements副主编。

主讲内容简介

    道路基层的关键材料特性对沥青和水泥混凝土路面的路用性能产生重大的影响,现行AASHTOWare力学经验法将基层材料的土水特征曲线、回弹模量、抗冲刷指标等作为设计参数,但有研究指出沥青和水泥路面的典型路用性能对这些设计参数敏感度很低甚至不敏感,因此,采用或建立能确切地评判路用性能的基层材料力学经验模型至关重要。为构建其力学经验模型,首先,对基层材料影响路用性能的关键材料特性进行全面的分析和评价,考虑基层的服役环境中交通循环荷载和环境因素对关键材料特性的影响,据此提出科学的排序标准选取或发展合适的力学经验模型;其次,对关键材料特性开展试验研究、理论及数值分析,提出能准确表征基层材料服役特征(如应力相关性和湿度敏感性等)的试验及分析方法,并建立基层材料关键性能的预估模型;最后,通过参数的敏感性分析对比本研究提出的基层模型和AASHTOWare力学经验法中对应的模型,为提高沥青和水泥混凝土路面典型路用性能对基层材料的敏感程度和优化基层材料设计提供进一步的认识。

New Damage, Healing and Aging Framework for Asphalt Roads

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主讲人:Dr. Bjorn Birgisson

邀请人:朱兴一

时间:2019年5月29日(周三)9:00-11:00

地点:交通运输工程学院211会议室

主讲人简介

    Dr. Bjorn Birgisson currently serves as a TEES Eminent Professor in the Zachry Department of Civil Engineering at Texas A&M University. Formerly, he served as the inaugural Director of the Center for Infrastructure Renewal. He has published over 200 technical papers in journals and proceedings. Prior to joining Texas A&M, he served as a Pro Vice-Chancellor for Aston University and the Executive Dean for the School of Engineering and Applied Science and Chaired Professor of Transport Science at Aston University from January 2014 to August, 2016. Prior to that, Dr. Bjorn Birgisson was the vice president responsible for research and Chaired Professor of Highway and Railway Engineering at the KTH Royal Institute of Technology in Stockholm, Sweden. Dr. Birgisson has served on over 20 boards of centers, institutes and companies during the last 10 years. Most recently he co-established the new Academy for Pavement Science and Engineering (APSE), which includes over 40 universities from all over the world, for which he serves on the executive board.

主讲内容简介

    This presentation summarizes new findings from research at Texas A&M University on fracture damage, healing and aging. A new comprehensive energy-based framework for healable microdamage is proposed, along with energy-based criteria for healing. In addition, a critical crack length beyond which no healing can occur is presented for both adhesive and cohesive cracks. This critical crack length can also be represented by a strain energy threshold that defines the transition between healable micro-cracks and non-healable macro-cracks. Finally, a new aging framework is introduced that illustrates how the micro-damage evolution and the healing thresholds are affected by aging.

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