孟加拉某公路项目路面沥青混凝土配合比设计

通过孟加拉国某公路项目的施工实践,介绍路面沥青混凝土配合比设计情况,根据实验结果,确定最佳配合比及最佳沥青含量及相应参数,保证了工程质量。     

援孟八桥深水钢吊箱围堰设计

以中国援助孟加拉国第八桥项目为依托,对比了各类常见钢围堰的优缺点,并结合项目实际情况选择钢吊箱、钢板桩作为主桥基础施工的围护结构。主桥跨中处深水基础采用钢吊箱围堰施工,钢吊箱围堰通过吊箱钢侧板和底板上的混凝土封底形成封闭的止水结构,为深水基础的施工提供操作空间及施工条件。本文从设计思路、结构形式及各工况的结构验算等方面进行阐述,研究表明,该钢吊箱结构设计安全可靠,传力明确合理。此外,该钢吊箱结构在现场实际施工中具有良好的止水和支护效果,为后期指导同类型钢吊箱设计与施工提供有效依据。     

孟加拉国米轨客车空调系统

孟加拉国米轨铁路客车的气候条件十分恶劣,要求客车的空调系统有很强的环境适应能力和非常高的运行可靠性。长春轨道客车股份有限公司研制开发了孟加拉国米轨客车的空调系统。该空调系统主要由单元式空调机组、送风系统、回风系统、废排系统等组成。从初步的试验数据来看,其运行效果比较理想。     

The value of transportation accessibility in a least developed country city – The case of Rajshahi City,Bangladesh

Little appears to be known about the capitalization of transportation accessibility in South Asian housing markets, which typically differ from those of industrialized countries. This study starts addressing this gap by providing empirical evidence about the nature and the magnitude of the value of accessibility as reflected by residential rents in Rajshahi City, Bangladesh. Results of our SARAR spatial hedonic model estimated on 526 observations from a random sample collected via in-person interviews indicate that the rent of a multi-unit dwelling decreases by 0.0239% for every 1% increase in network access distance to the nearest major road. Moreover, proximity (within 400 m) to a primary school and to a healthcare facility commands rent premiums of respectively 93.55 BDT ($1.40) and 109.45 BDT ($1.64). Surprisingly, whether access roads are paved or not does not statistically impact rents, probably because of the dominance of walking, rickshaws use, and biking, combined with the rarity of personal cars. Likewise, proximity to bus stops and to train stations is not reflected in rents of multi-family dwellings, likely because buses and trains in Rajshahi City only provide regional and national service. Differences in estimates of our spatial models between maximum likelihood (ML) and generalized spatial two-stage-least-squares illustrate the danger of relying on ML in the presence of heteroskedasticity. These results should be useful for planning transportation infrastructure funding measures in least developed country cities like Rajshahi City.