京秦高速公路路面早期破坏原因

对沥青路面常见病害产生的原因进行分析,并从路面结构设计、厚度设计、配合比设计及路面现场施工等方面提出提高路面质量的技术措施。     

水泥混凝土路面病害的预防及处理措施

随着我国公路建设的快速发展,水泥混凝土路面的铺筑越来越广泛。目前,我国各省市二级公路大部分采用水泥混凝土刚性路面,在部分省市如广西、广东,水泥混凝土刚性路面还广泛运用于高速公路。因此,水泥砼路面的质量对投资和运营至关重要。     

浅析沥青混凝土路面的早期破坏

分析了高速公路沥青混凝土路面早期破坏的几种主要形式,并提出相应的控制措施。     

Evolution of the household vehicle fleet: Anticipating fleet composition, PHEV adoption and GHG emissions in Austin, Texas

In today’s world of volatile fuel prices and climate concerns, there is little study on the relationship between vehicle ownership patterns and attitudes toward vehicle cost (including fuel prices and feebates) and vehicle technologies. This work provides new data on ownership decisions and owner preferences under various scenarios, coupled with calibrated models to microsimulate Austin’s personal-fleet evolution.Opinion survey results suggest that most Austinites (63%, population-corrected share) support a feebate policy to favor more fuel efficient vehicles. Top purchase criteria are price, type/class, and fuel economy. Most (56%) respondents also indicated that they would consider purchasing a Plug-in Hybrid Electric Vehicle (PHEV) if it were to cost $6000 more than its conventional, gasoline-powered counterpart. And many respond strongly to signals on the external (health and climate) costs of a vehicle’s emissions, more strongly than they respond to information on fuel cost savings.Twenty five-year simulations of Austin’s household vehicle fleet suggest that, under all scenarios modeled, Austin’s vehicle usage levels (measured in total vehicle miles traveled or VMT) are predicted to increase overall, along with average vehicle ownership levels (both per household and per capita). Under a feebate, HEVs, PHEVs and Smart Cars are estimated to represent 25% of the fleet’s VMT by simulation year 25; this scenario is predicted to raise total regional VMT slightly (just 2.32%, by simulation year 25), relative to the trend scenario, while reducing CO₂ emissions only slightly (by 5.62%, relative to trend). Doubling the trend-case gas price to $5/gallon is simulated to reduce the year-25 vehicle use levels by 24% and CO₂ emissions by 30% (relative to trend).Two- and three-vehicle households are simulated to be the highest adopters of HEVs and PHEVs across all scenarios. The combined share of vans, pickup trucks, sport utility vehicles (SUVs), and cross-over utility vehicles (CUVs) is lowest under the feebate scenario, at 35% (versus 47% in Austin’s current household fleet). Feebate-policy receipts are forecasted to exceed rebates in each simulation year.In the longer term, gas price dynamics, tax incentives, feebates and purchase prices along with new technologies, government-industry partnerships, and more accurate information on range and recharging times (which increase customer confidence in EV technologies) should have added effects on energy dependence and greenhouse gas emissions.     

Asymmetric response model for evaluating airline service quality: An empirical study in cross-strait direct flights

In this paper we propose a framework to investigate service quality asymmetrically. An asymmetric response model within structural equation framework is developed to study the relationship between service quality and the passenger’s behavioral intention in the cross-strait direct flight (Taiwan–Shanghai). The results reveal that service quality in the loss region has more impact on behavioral intention than service quality in the gain region. Hence, attention should be paid to the service quality of important attributes in the loss region and strategies should ensure service quality of those important attributes that meet passenger’s expectations.     

山区河流航道整治建筑物遭受异相耦合破坏作用的特征及仿真探讨

探讨了山区河流航道整治建筑物水毁灾害过程中各物相 (固态、液态、气态 )之间耦合破坏作用的特征 ,耦合作用物理模型及仿真模型的概念和关系 ,为深入研究整治建筑物水毁机理提供理论依据     

城市交通与城市空间结构演变

通过回顾城市交通和城市空间结构的发展演变过程，研究城市交通引导城市空间结构健康“生长”的有效途径，提出通过公共交通引导城市可持续发展的模式，以及适合中国特色的和谐城市形态和城市交通。     

单桩荷载传递法修正计算分析

基于层状地基采用双曲线模型为荷载传递函数,提出了用Mindlin解和桩土共同作用的联合方法对荷载传递法的进行修正,并计算分析了单桩承载特性。将Lee的方法与双曲线荷载传递函数相结合使得Lee方法中考虑土体横向连续性的优点得以发挥。将横向连续性与竖向连续性修正相结合得到修正荷载传递法,用编制的计算机程序进行了工程实例的计算,结果表明,计算结果与实测值较为接近,其土层的平均SPT值较小,土体较容易产生变形,当试验荷载较高时,可能造成桩周土与桩身之间的滑移。修正荷载传递法与未修正和仅进行竖向修正的荷载传递法相比具有一定的精确性,能更好地反映单桩承载特性,且适用于群桩的分析计算。     

桥梁检测技术研究及工程运用

简述了桥梁结构检测的主要内容与评定方法，结合目前桥梁检测技术发展的现状，对桥梁检测技术进行了综合评价，并介绍了桥梁检测技术的发展前景。     

大跨斜拉桥扁平钢箱梁损伤定位指标的噪声鲁棒性比较研究

以润扬大桥斜拉桥的扁平钢箱梁结构为分析对象,采用子结构方法将扁平钢箱梁结构的整体尺度动力特性和细节尺度构件损伤相互衔接实现多尺度损伤分析。在此基础上对模态曲率、模态应变能、模态柔度和斜拉索索力等4类结构损伤定位指标的抗噪声干扰能力进行了对比分析。分析结果表明,模态应变能和模态柔度对于扁平钢箱梁结构损伤定位具有较好的互补性,将其相结合对扁平钢箱梁主跨和边跨的损伤识别具有较好的抗噪声干扰能力。