雷德朋体系的道路交通规划思想评述

雷德朋作为汽车时代第一域,其道路交通规划思想曾被认为是现代依赖小汽车的土地开发模式的先驱。通过对雷德朋体系规划思想的历史追溯,回顾了其规划思想产生的背景,提出的规划目标和对应的规划方法,在此基础上对规划思想的整体性优点进行了分析,在总结其提出的分级道路系统和人车分流体系特点的同时也指出其历史局限性,并根据上述分析重新评价了雷德朋体系合理的历史定位。为当前发展以公共交通为导向和强调多种交通模式相融合的道路交通规划新思想提供借鉴。     

Parametric study of seismic performance of super-elastic shape memory alloy-reinforced bridge piers

One of the important measures of post-earthquake functionality of bridges after a major earthquake is residual displacement. In many recent major earthquakes, large residual displacements resulted in demolition of bridge piers due to the loss of functionality. Replacing the conventional longitudinal steel reinforcement in the plastic hinge regions of bridge piers with super-elastic shape memory alloy (SMA) could significantly reduce residual deformations. In this study, numerical investigations on the performance of SMA-reinforced concrete (RC) bridge bents to monotonic and seismic loadings are presented. Incremental dynamic analyses are conducted to compare the response of SMA RC bents with steel RC bents considering the peak and the residual deformations after seismic events. Numerical study on multiple prototype bridge bents with single and multiple piers reinforced with super-elastic SMA or conventional steel bars in plastic hinge regions is conducted. Effects of replacement of the steel rebar by SMA rebar on the performance of the bridge bents are studied. This paper presents results of the parametrical analyses on the effects of various design and geometric parameters, such as the number and geometry of piers and reinforcement ratio of the RC SMA bridge bents on its performance.     

苏州明清园林中歇山顶亭大木构架特征研究

苏州明清园林中的歇山顶亭具有典雅、精细、秀美及充满诗情画意的气质,以及灵活、多样、与环境巧妙结合的特性,独具一格,很值得研究。文章从吴文化与香山帮传统建筑营造技艺入手,对苏州明清园林中歇山顶亭的平面形状、构架体系及构件细部进行了分析,阐明了歇山顶亭大木构架特点。本研究的开展有助于对苏州明清园林中歇山顶亭的分类与特征进行补充,并为进一步挖掘香山帮木作营造技术的渊源与变迁奠定基础。     

屋顶“平改坡”节能工程施工与项目管理

简单论述了屋顶"平改坡"工程在建筑节能方面的重要性,着重对屋顶"平改坡"节能工程的施工和项目管理方面需要注意的事项进行了研究,通过有效实施,提高了工程质量,同时加快了施工进度。     

曝气生物滤池处理高档卷烟纸生产废水

采用混凝沉淀/曝气生物滤池(BAF)组合工艺对卷烟纸生产废水进行处理,处理水量为2 000～3 400 m3/d,混凝沉淀出水COD为120～400 mg/L,色度为2～4倍。经BAF工艺处理后的出水COD<100 mg/L,去除率稳定在50%～80%,色度<4倍。工程运行实践表明,采用混凝沉淀/BAF组合工艺处理高档卷烟纸生产废水稳定可行,具有良好的经济效益和环境效益。     

优化偏心支撑框架的连接件以获得最大耗能能力

给出偏心支撑框架(EBF)的优化设计方法,将其作为被动控制手段应用于建筑结构的抗震设计中。在EBF梁与支撑的连接件处设置加劲肋以提高其刚度和塑性变形能力。给出连接件加劲肋位置及厚度的优化设计方法,采用Tabu搜索算法求解最优解,其目标函数为破坏前的塑性能量耗散。采用有限元软件计算静态循环荷载作用下连接件的变形,结果显示,通过微单元优化可以提高连接件的耗能能力。     

“白改黑”道路路面的通病与防治措施

"白改黑"路面是水泥混凝土路面加铺沥青混合料所形成的路面结构。由于"白改黑"路面结构的特点,因此早期路面发生病害不可避免。介绍了"白改黑"路面的特性及早期病害产生的重要原因,并提出了"白改黑"路面早期病害的防治措施。     

Systemic Diagramming: An Approach to Decoding Urban Ecologies

For many students, sustainability has become an obligatory add-on for any project. Here Ulysses Sengupta and Deljana Iossifova explain how they have sought to address this in their teaching at the University of Nottingham through a ‘systemic diagramming’ approach. This provides essential tools for understanding how resource flows and environmental concerns are embedded in physical urban transformation, socioeconomic fault lines and underlying power relations.     

实腹式垂直拉索通信塔的设计研究

世博白莲泾通信景观综合塔是国内首个实腹式垂直拉索受力体系,独特的建筑外形给结构设计带来难度,本文对该通信塔的结构受力分析、温度影响、异型截面风荷载体型系数和索力监测等问题进行研究,为今后此类结构的设计提供参考。     

A study on the fault diagnosis of the 3-d roll shape in cold rolling

The metal processing system usually consists of various components such as motors, work rolls, backup rolls, idle rolls, sensors, etc. Even a simple fault in a single component in the system may cause a serious damage on the final product. It is, therefore, necessary to diagnose the faults of the components to detect and prevent a system failure. Especially, the defects in a work roll are critical to the quality of strip. In this study, a new 3-D diagnosis method was developed for roll shape defects in rolling processes. The new method was induced from analyzing the rolling mechanism by using a rolling force model, a tension model, the Hitchcock’ s equation, and measurement of the strip thickness, etc. Computer simulation shows that the proposed method is very useful in the diagnosis of the 3-D roll shape.