为了探究RUHPC + AC复合式路面在车轮动载下的力学响应规律,制作了RUHPC + AC复合试件,进行车轮动态载荷力学响应试验,从应变特性和应变变化幅度两方面重点对AC层应变进行了深入分析。结果表明:AC层顶和层底纵向在加载初期处于拉压复合...为了探究RUHPC + AC复合式路面在车轮动载下的力学响应规律,制作了RUHPC + AC复合试件,进行车轮动态载荷力学响应试验,从应变特性和应变变化幅度两方面重点对AC层应变进行了深入分析。结果表明:AC层顶和层底纵向在加载初期处于拉压复合应变状态,前者主要受压,后者主要受拉,达到一定加载时间后呈现为全部受压。此外,AC层纵向、竖向应变随加载时间呈现对数关系增大趋势,而AC层应变变化幅度随加载时间呈线性关系减小。研究结论为RUHPC + AC复合式路面的设计和维护提供了参考依据,有助于该复合式路面在未来道路工程领域的推广。In order to investigate the mechanical response law of RUHPC + AC composite pavement under wheel dynamic loading, RUHPC + AC composite specimens were fabricated, the mechanical response test of wheel dynamic loading was carried out, and the AC layer strain was analyzed in-depth from the aspects of strain characteristics and strain change amplitude focusing on the AC layer strain. The results show that the longitudinal direction of the top and bottom of the AC layer is in the state of tension-pressure composite strain at the beginning of loading;the former is mainly subjected to compression, and the latter is mainly subjected to tension, and all of them are subjected to compression after reaching a certain loading time. In addition, the longitudinal and vertical strains of the AC layer showed a trend of increasing logarithmically with loading time, while the magnitude of strain change of the AC layer decreased linearly with loading time. The conclusions of the study provide a reference basis for the design and maintenance of RUHPC + AC composite pavements, which will help the composite pavements become popular in the field of road engineering in the future.展开更多
Some metamorphic relations （MR） are not good at detecting faults in metamorphic testing. In this paper, the method of making compositional MR （CMR） based on the speculative law of proposition logic is presented. T...Some metamorphic relations （MR） are not good at detecting faults in metamorphic testing. In this paper, the method of making compositional MR （CMR） based on the speculative law of proposition logic is presented. This method constructs new MRs by composing existing MRs in a pairwise way. Because CMR contains all the advantages of the MRs that form it, its fault detection performance is wonderful. On the other hand, the number of relations will decrease greatly after composing, so a program can be tested with much fewer test cases when CMRs are used. In order to research the characteristics of a CMR, two case studies are analyzed. The experimental results show that the CMR＇s performance is mostly determined by the central MRs forming it and the sequence of composition. Testing efficiency is improved greatly when CMRs are used.展开更多
文摘为了探究RUHPC + AC复合式路面在车轮动载下的力学响应规律,制作了RUHPC + AC复合试件,进行车轮动态载荷力学响应试验,从应变特性和应变变化幅度两方面重点对AC层应变进行了深入分析。结果表明:AC层顶和层底纵向在加载初期处于拉压复合应变状态,前者主要受压,后者主要受拉,达到一定加载时间后呈现为全部受压。此外,AC层纵向、竖向应变随加载时间呈现对数关系增大趋势,而AC层应变变化幅度随加载时间呈线性关系减小。研究结论为RUHPC + AC复合式路面的设计和维护提供了参考依据,有助于该复合式路面在未来道路工程领域的推广。In order to investigate the mechanical response law of RUHPC + AC composite pavement under wheel dynamic loading, RUHPC + AC composite specimens were fabricated, the mechanical response test of wheel dynamic loading was carried out, and the AC layer strain was analyzed in-depth from the aspects of strain characteristics and strain change amplitude focusing on the AC layer strain. The results show that the longitudinal direction of the top and bottom of the AC layer is in the state of tension-pressure composite strain at the beginning of loading;the former is mainly subjected to compression, and the latter is mainly subjected to tension, and all of them are subjected to compression after reaching a certain loading time. In addition, the longitudinal and vertical strains of the AC layer showed a trend of increasing logarithmically with loading time, while the magnitude of strain change of the AC layer decreased linearly with loading time. The conclusions of the study provide a reference basis for the design and maintenance of RUHPC + AC composite pavements, which will help the composite pavements become popular in the field of road engineering in the future.
基金The National Natural Science Foundation of China(No.60425206,60633010,60773104,60503033)the Excellent Talent Foundation of Teaching and Research of Southeast University
文摘Some metamorphic relations （MR） are not good at detecting faults in metamorphic testing. In this paper, the method of making compositional MR （CMR） based on the speculative law of proposition logic is presented. This method constructs new MRs by composing existing MRs in a pairwise way. Because CMR contains all the advantages of the MRs that form it, its fault detection performance is wonderful. On the other hand, the number of relations will decrease greatly after composing, so a program can be tested with much fewer test cases when CMRs are used. In order to research the characteristics of a CMR, two case studies are analyzed. The experimental results show that the CMR＇s performance is mostly determined by the central MRs forming it and the sequence of composition. Testing efficiency is improved greatly when CMRs are used.
