盐碱地区大面积混凝土晒场裂缝原因及防治

夏季盐碱地区大面积现浇混凝土晒场完工一段时间后，往往易出现空鼓、隆起、变形裂缝。其原因与土壤性质、施工工艺、基层结构、现场条件以及混凝土自身收缩等因素有关。本文通过实例分析其裂缝产生的原因，并提出防治措施。     

Method to Monitor Helicopter Rotor Fault Using Diagnostic Matrix

An efficient method for helicopter rotor fault diagnosis was proposed using diagnostic matrix and its software framework was developed.The diagnostic matrix was extracted by the way of simulating the quantitative models of damaged and undamaged rotor systems.The conflicts were recognized by the virtual symptom sensor based on the dependencies between symptoms and faults.Diagnostic candidates were generated by the Boolean hitting algorithm.The proposed method provides multi-fault real-time diagnostic capabil...     

圆柱体表面缺陷检测的ANSYS仿真

采用交变磁场测量的圆柱体表面缺陷的ANSYS仿真,以各向同性铝圆柱体为试件,采用柱坐标系及矩形激励线圈,电流流向为圆柱体轴向.将圆柱体体划分后再对各分体局部网格划分.划分较密的缺陷部分向周围划分较疏部分过渡时,采用四面体自由划分衔接.对带有表面周向缺陷的圆柱体网格划分后,产生的单元类型为四面体与六面体的混合.其仿真采用波前求解器.仿真路径为激励线圈沿缺陷长度方向、经过缺陷中心点进行周向移动.     

谈建筑工程绿色施工技术的应用与管理

结合具体工程,详细论述了绿色施工技术在该项目中的体现,如节水、节地、节能、节材与环境保护等方面,指出在整个施工过程中将该技术充分运用到每一处,牢牢抓住这一观点,是实现绿色创新的重要保障。     

古建筑保护中的整旧如旧与整旧如新

以古建筑保护的方向为出发点,对整旧如旧与整旧如新两种古建筑的修缮保护观点进行了论述,指出整旧如新的做法在古建筑的保护中存在着很大的弊端,但整旧如旧如果处理不当同样会对古建筑产生保护性伤害,在古建筑保护修缮过程中应针对不同问题区别对待。     

Developing a procurement path determination chart SEM-based approach

The choice of an appropriate procurement system is crucial to construction project success. Procurement selection is largely based on path determination charts, with at least eight key criteria needing to be weighted by decision-makers. Including certain criteria whilst ignoring client-borne transaction costs (TCs) resulting from environmental uncertainties simplifies this process. TCs are ‘unseen’ costs associated with pre- and post-contract work. The effects of uncertainties in the transaction environment and procurement systems on TCs are investigated, comparing the traditional and design-build procurement systems. A cross-sectional sample approach was deployed, involving survey questionnaire and results verification through ‘real-world’ cases. Data was sought from construction professionals in management, design and operation of construction projects. The research participants evaluate their time spent on procurement activities using a five-point Likert scale. Hypotheses of the relations between environmental uncertainties, procurement systems, and pre- and post-contract TCs are tested using a structural equation modelling (SEM) approach. The study found that TCs account for about 46.75% and 42.88% of the daily time spent by project managers in traditional and design-build procurement systems in New Zealand respectively. The study concludes that the TC concept is a useful framework for determining objective instead of subjective opinions for procurement decisions.     

探讨绿色建筑设计与绿色节能建筑

随着建筑行业的快速发展,为了缓和日渐紧张的人口和资源矛盾,提高资源使用率,降低资源消耗,实现人与自然和谐相处的发展策略,必须要走绿色环保性建筑的道路。本文就绿色建筑的设计和绿色节能建筑进行讨论分析。     

公路路基防护与加固措施探析

由于高速公路全年连续运行使用,通过破坏当地地表、人工修筑且显露于外的路基在长时间经受各种因素的影响,可能会导致路基的稳定性受到破坏,产生一系列问题。     

浅析高层建筑给排水消防设计

高层建筑消防给排水施工设计所涉及的专业内容较为广泛,需要结合每个系统的实际情况展开最具安全保障的有效设计,强化设计的稳定可靠性。唯有在可靠的技术保障下实施便捷操作,方能保证建筑与人员的安全。     

武汉二七长江大桥防雷与接地设计

介绍武汉二七长江大桥的直击雷防护、侧击雷防护措施和电涌保护器的设置．以及接地设计、接地电阻的检测、施工要求等。重点介绍大桥利用基础桩基内外边缘的结构钢筋（包括钢护筒）作为接地板的做法。