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41.
介绍武汉白沙洲长江公路大桥主桥87 m混凝土箱梁采用设临时墩搭支架平台、模拟前支点挂篮悬浇的施工工艺和方法。 相似文献
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为解决冗余度机器人手臂在运动过程中出现的关节角偏差问题,探讨与分析了一种基于新型性能指标的二次型优化模型,以使机械臂的关节能实现重复运动.在考虑各种关节物理极限(如关节角度极限和关节速度极限)的情况下,该模型最终被转化为一个标准的二次型优化问题来求解.同时,基于负梯度法的原理分析和基于PUMA560的平面四连杆机械臂的计算机仿真结果表明,该方案具有可行性和有效性. 相似文献
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文章针对目前广西公路施工内业资料的收集、整理过程中存在内容失真,浪费人力资源等情况,介绍采用高等级公路施工资料的统一格式及电子化管理,以更好地提高施工内业资料管理效率。 相似文献
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从城市环境的现状和影响城市环境的因素入手,对城市景观设计中应具备的生态观和审美观进行分析,根据分析的结果,提出一套适合城市发展需要景观设计的新思路、新理念。 相似文献
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高速铁路先简支后连续模型箱梁内模制造及施工工艺探讨 总被引:1,自引:1,他引:0
曹凤洁 《铁道标准设计通讯》2005,(2):39-40
针对高速铁路先简支后连续梁的内模设计、制造及先简支后连续法梁体混凝土灌筑、施工工艺进行探讨。 相似文献
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Lawrence Frank Mark Bradley Sarah Kavage James Chapman T. Keith Lawton 《Transportation》2008,35(1):37-54
The primary purpose of this study was to investigate how relative associations between travel time, costs, and land use patterns
where people live and work impact modal choice and trip chaining patterns in the Central Puget Sound (Seattle) region. By
using a tour-based modeling framework and highly detailed land use and travel data, this study attempts to add detail on the
specific land use changes necessary to address different types of travel, and to develop a comparative framework by which
the relative impact of travel time and urban form changes can be assessed. A discrete choice modeling framework adjusted for
demographic factors and assessed the relative effect of travel time, costs, and urban form on mode choice and trip chaining
characteristics for the three tour types. The tour based modeling approach increased the ability to understand the relative
contribution of urban form, time, and costs in explaining mode choice and tour complexity for home and work related travel.
Urban form at residential and employment locations, and travel time and cost were significant predictors of travel choice.
Travel time was the strongest predictor of mode choice while urban form the strongest predictor of the number of stops within
a tour. Results show that reductions in highway travel time are associated with less transit use and walking. Land use patterns
where respondents work predicted mode choice for mid day and journey to work travel.
Lawrence Frank is an Associate Professor and Bombardier Chair in Sustainable Transportation at the University of British Columbia and a Senior Non-Resident Fellow of the Brookings Institution and Principal of Lawrence Frank and Company. He has a PhD in Urban Design and Planning from the University of Washington. Mark Bradley is Principal, Mark Bradley Research & Consulting, Santa Barbara California. He has a Master of Science in Systems Simulation and Policy Design from the Dartmouth School of Engineering and designs forecasting and simulation models for assessment of market-based policies and strategies. Sarah Kavage is a Senior Transportation Planner and Special Projects Manager at Lawrence Frank and Company. She has a Masters in Urban Design and Planning from the University of Washington and is a writer and an artist based in Seattle. James Chapman is a Principal Transportation Planner and Analyst at Lawrence Frank and Company in Atlanta Georgia. He has a Masters in Engineering from the Georgia Institute of Technology. T. Keith Lawton transport modeling consultant and past Director of Technical services, Metro Planning Department, Portland, OR, has been active in model development for over 40 years. He has a BSc. in Civil Engineering from the University of Natal (South Africa), and an M.S. in Civil and Environmental Engineering from Duke University. He is a member and past Chair of the TRB Committee on Passenger Travel Demand Forecasting. 相似文献
T. Keith LawtonEmail: |
Lawrence Frank is an Associate Professor and Bombardier Chair in Sustainable Transportation at the University of British Columbia and a Senior Non-Resident Fellow of the Brookings Institution and Principal of Lawrence Frank and Company. He has a PhD in Urban Design and Planning from the University of Washington. Mark Bradley is Principal, Mark Bradley Research & Consulting, Santa Barbara California. He has a Master of Science in Systems Simulation and Policy Design from the Dartmouth School of Engineering and designs forecasting and simulation models for assessment of market-based policies and strategies. Sarah Kavage is a Senior Transportation Planner and Special Projects Manager at Lawrence Frank and Company. She has a Masters in Urban Design and Planning from the University of Washington and is a writer and an artist based in Seattle. James Chapman is a Principal Transportation Planner and Analyst at Lawrence Frank and Company in Atlanta Georgia. He has a Masters in Engineering from the Georgia Institute of Technology. T. Keith Lawton transport modeling consultant and past Director of Technical services, Metro Planning Department, Portland, OR, has been active in model development for over 40 years. He has a BSc. in Civil Engineering from the University of Natal (South Africa), and an M.S. in Civil and Environmental Engineering from Duke University. He is a member and past Chair of the TRB Committee on Passenger Travel Demand Forecasting. 相似文献
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贝雷桁架是公路与市政建设行业中常用的设备构件。该文以上海市轨道交通9号线一期工程淀浦河桥挂篮施工为例,介绍如何采用贝雷桁架代替挂篮施工中常采用的三角形支架或菱形支架,进行挂篮设计与施工。 相似文献