给水管网压力监测点的优化布置

以厦门市给水管网压力监测点的布置为例，根据给水管网压力监测系统的实际运行数据，综合利用变量相关系数和变量标准差等信息，建立了管网压力监测系统信息量的优化模型．并采用残差、信息损失比率及逐步回归方法，确定了给水管网压力监测点的优化布置方案。     

浅谈工程量清单的编制

文章依据《建设工程工程量清单计价规范》,围绕当前工程量清单编制实践中存在的一些共性问题,分别对分部分项工程量清单、措施项目清单、其他项目清单三部分的编制方法逐一进行了探讨。文章并结合案例分析了工程量清单项目设置过程中项目名称设置、工程特征表述与工程内容描述间的区别与联系,指出准确编制工程量清单应注意的问题。     

嵌岩桩设计中几个问题的探讨

从嵌岩桩设计中迟到的实际问题出发，指出了现行设计规范存在的不足。对设计方法、设计标准、设计参数的取值及桩的载荷试验标准等问题进行了深入的探讨，并提出了按桩的承载方式进行设计、从承载力和变形双向进行控制、参数取值应符合桩的荷载传递规律等有益的结论。     

矿山建筑与山区地基

二峰山铁矿建筑群座落在地形、地貌、地质、地层复杂多变的采空区，因此对矿山建筑物和山区地基的影响很大。为处理好矿山建筑与山区地基的关系，探讨了矿山建筑群的布局，排渣场和路边地形的利用问题。分析了矿山地基事故发生的各种原因，并提出几种典型地基的处理办法，而且还在技术和经济上均取得了较大成效。     

Non-linear finite element analysis of axially restrained steel beams at elevated temperatures in a fire

A method is presented for the analysis of the non-linear structural behavior of axially restrained steel beams at elevated temperatures, which employs the axis arc-length and section rotation of the deformed beam as basic variables. The novelty of the proposed formulation is an inclusion of a balance function that measures the error of the equilibrium between the internal- and external-forces in a cross-section of the beam. This strategy can easily deal with the geometric non-linearity and elasto-plasticity of steel at elevated temperatures. Each node for representing the section of the beam has two degrees of freedom in the proposed method. It is more computationally economical than the traditional beam element, which has three degrees of freedom. An example beam is studied to verify the proposed method. Parameters including the load ratio, axial restraint stiffness ratio, transversal and longitudinal temperature gradient, are studied. The middle-span’s deflection, axial force and moment, along with the strain and stress distributions across the section, are calculated at elevated temperatures. The comparison with results from the finite element method employing shell elements shows that the method presented here is precise.     

扩底抗拔桩承载力计算方法与工程应用

上海地区扩底抗拔桩具有中长度、小扩展角度的特点。基于现场足尺试验与工程实践,提出了适合该桩型抗拔承载力计算的两种方法:圆柱面剪切法和扩大系数法。其中圆柱面剪切法假定桩端扩大头以上一定范围内的土体剪切面直径等于扩大头最大直径,超过此范围的桩等截面部分的侧摩阻力不受影响。扩大系数法通过扩底扩大系数和旁压扩大系数来反映扩大头段抗拔阻力的提高。这两种方法分段套用现有规范的抗拔桩计算公式,参数选取容易,公式简洁,便于工程设计人员采用。这种新型的扩底抗拔桩及其承载力计算方法在瑞金医院地下车库和上海铁路南站南广场中得到应用,试验结果皆大于计算值,其中上海铁路南站南广场工程计算值与试验结果非常接近,进一步验证了计算方法的合理性,并为认识扩底抗拔桩的承载特性提供了参考。     

三种地基处理方法提高某水闸基桩水平承载力效果对比研究

工程建设中经常会遇到软弱地基土,它们必须经过处理才能满足强度和变形的要求.结合曹娥江大闸枢纽工程,对三种地基处理方法下(碎石振动碾压法、振动碾压法和振捣法)基桩的受力特性进行了分析.通过单桩水平静载荷试验得出结论,三种方法对桩水平承载力都有很大的提高,特别是碎石振动碾压法和振动碾压法的效果最显著.     

自平衡法在预应力管桩承载力测试中的应用和对比分析

自平衡法是一种新型的桩基承载力测试方法,与传统静载荷试验方法相比具有许多优点。采用自平衡试桩法对东南大学江宁九龙湖校区研究生公寓的3根预应力混凝土管桩进行了承载力测试,并成功地探索出回收荷载箱并可再次利用的新型测试方案。研究结果表明,自平衡法在管桩测试中取得了较好的效果,可为设计提供可靠依据。     

后张法预应力箱梁施工实践与探索

分析了后张法预应力箱梁施工中存在的一些技术性、工艺性和安全性的问题，同时也揭示了我国现阶段建筑市场领域设计、施工、监理行业技术工作者的情况，以期对设计、施工、监理行业的技术工作者有点启示。     

Pedestrian and Bicycle Volume Data Collection Using Drone Technology

ABSTRACT

Pedestrian and bicycle volume data is one of the most fundamental types of data for active transportation planning. However, they are not yet well developed. This paper explores an innovative method that uses drone technology to collect pedestrian and bicycle volume data. It confirms the feasibility of the technology as an alternative method to collect complex movements of pedestrians and bicycles. Furthermore, this paper presents a method that converts the video footage to a spatiotemporal dataset. The dataset includes not only the pedestrian and bicycle count data, but also their behavior and characteristics. The spatiotemporal data can become a valuable resource for a variety of active transportation planning practices and research, including the collection of pedestrian and bicycle volume data in parks and recreational areas, the study of collisions between pedestrians and bicycles, and the analysis of the social path. Since it is possible to envision that the development of technologies can overcome current technical difficulties, such as battery lifespan, it is worth considering the application of drone technology to active transportation planning practice and research.