【摘 要】
:
Boston Manor Viaduct opened to traffic in 1965 and was constructed as part of the expansion of the motorway network in the United Kingdom.It consisted of 21
【机 构】
:
Connect Plus (M25) Ltd London,UK
【出 处】
:
The 7th International Conference on Bridge Maintenance, Safe
论文部分内容阅读
Boston Manor Viaduct opened to traffic in 1965 and was constructed as part of the expansion of the motorway network in the United Kingdom.It consisted of 21 spans.The four spans nearest to Heathrow airport were constructed of reinforced concrete beams and slabs.The remaining spans are all of composite steel/concrete deck design.There are 17 spans: fourteen steel plate girder beams supporting cross girders with composite concrete slab whilst the remaining three spans use a pair of steel trusses in place of the four plate girder beams.
其他文献
本文通过文献梳理与实地调研相结合的方法阐明了日本农村集体产权制度的演进、特征和产权构成。研究发现,从“多数人对同一财产共同享有所有权”的视角来看,农村集体产权制度并非公有制国家独有,在资本主义私有制国家是国家所有权和私人所有权之外的第三种产权形式。日本农村集体产权制度是以土地等资源的农民集体所有和集体成员按需使用而形成的产权制度,具有总有权性质,根据各地习惯进行规范,存在多元权利形式和非公示性的特征,其法理体系相对完善,司法实践丰富。建议基于总有权理论推进我国农村集体产权制度改革;采取“一户一股”的方式确
业绩承诺已成为我国上市公司并购重组的基本特征,但在这一热潮下,违约现象也屡有发生,促使人们思考业绩承诺背后的真实动机。本文基于我国资本市场的高频交易数据,从财富转移与信号传递两个视角辨析了并购重组中业绩承诺对机构和个人投资者在资金流向与投资收益方面的影响。研究发现,业绩承诺信息公告后,小投资者会更多买入并购企业股票,其投资收益为负并遭受了较大损失;而大投资者则显著降低其持仓,投资收益显著为正,财富效应在大小投资者之间转移明显。进一步的研究还发现,财富转移效应在业绩承诺违约、自愿性业绩承诺的并购重组中的差异
文章基于“稻米理论”,利用CLDS2016的数据,研究了文化差异对农村人口流动意愿的影响。研究结果表明,在加入控制变量、关注了内生性和样本选择偏误之后,相比于主产粮为非稻米的农村,主产稻米的农村居民有更低的流动意愿。依据稻米理论,文章对主产粮形成文化差异的机制进行检验,发现因灌溉系统的高成本和公共品属性,用水需求更高的稻米区具备了更高的集中灌溉设备拥有概率和集中灌溉面积,促成了人际交往合作和集体主义文化的产生。进一步地,文章探讨了文化差异影响人口流动意愿的内在机制,发现集体主义文化的稻米区有更高的社会资本
Orthotropic steel bridge deck is the main deck system of steel girder in long-span bridges with the advantage of light deadweight,high carrying capacity,and
The Romanian concrete viaduct over Stans valley completed in 1969 was damaged in time due to the water aggression by carbonatation and reinforcement bars co
在土地流转型规模经营面临的风险问题逐步显现的同时,服务带动型规模经营能否成为推动中国农业现代化的第二条道路,是当前农业发展理论和实践需要回答的重要问题。本文聚焦农户的农业产量和收益,初步建立了一个比较两种规模经营方式的逻辑框架,并基于山东临沂12个村、201个小麦种植户的实地调查,对土地流转与社会化服务在农业现代化中的作用及其关系进行了案例对比分析。结果表明,土地流转并非提升农业产出的必要条件,社会化服务才是农业实现规模经济的充要条件;尽管社会化服务在提升农业产出上更具有优势,但土地流转在扩大种植收益、提
This paper discusses a bridge analysis methodology,hypotheses and assumptions,documenting a bridge consumption methodology based on bridge fatigue concepts
本文基于扎根理论,从资源投入、经济增长、环境影响三个方面构建分析框架,将碳汇产出、氮磷污染纳入海洋碳汇渔业绿色效率的评价指标体系,并利用Super-SBM模型测算中国海洋碳
Fatigue is regarded as one of the major causes of failure for civil infrastructure worldwide.Continuous operation of such infrastructure over time requires
Assembly voided slab bridge is widely been used in China.It has many advantages.While the hinged joint of this kind of bridge becomes the weakest part.Distr