影响矩阵法确定斜拉桥的合理成桥状态

结合跨海斜拉桥范和港大桥这一工程实例,提出了如何基于影响矩阵法的原理,并结合相关软件,来快速得到影响矩阵,最终计算了范和港大桥的合理成桥索力,结果符合规范及工程计算的精度要求,方法简单方便,具有一定的借鉴意义。     

建筑外窗抗风压性能静载检测方法的研究

主要对静载检测建筑外窗抗风压性能的方法进行了研究。首先分析了窗扇的受力特点;然后提出以达到相同挠度变形为基础,将加载集中力F转换成均布力P并进行抗风压性能评级的方法。最后将静载检测窗户抗风压性能的结果与试验室中利用静压箱的检测结果进行了比较。     

空调系统中热湿处理过程的评价方法及应用

提出对热、湿处理过程进行单独(火用)评价的概念,并构建了相应评价指标.以某一次回风空调系统的典型夏季空气处理过程为例,在热力学极限意义上阐明了对热、湿处理进行单独(火用)评价的实施过程,计算结果表明该空气处理过程的显热(火用)效明显高于潜热(火用)效,潜热(火用)效低下的原因主要在于再热显热(火用)损和冷凝水(火用)损...     

浅谈桥梁静动载试验检测方法

指出桥梁静动载试验是分析桥梁特性的重要手段,在综述静动载试验的主要项目、试验目的、试验方法和注意事项的基础上,提出了静动载试验的改进方面和发展方向,以期为桥梁的安全运营、维护、加固、改建奠定基础。     

北京地铁浅埋暗挖双层风道设计

结合工程实例,介绍了双层风道的设计及施工方法,建立荷载—结构模型,使用SAP84程序软件取代框架进行平面计算,提出了设计中应注意的关键点,并利用监控量测获得信息指导施工,及时采取相应措施,确保施工安全。     

工程桩静荷载检测时间探讨

在静载检测的观测时间与桩的沉降量和工程桩承载力判别分析对比的基础上,提出采用维持荷载法检测工程桩静荷载是可行的。     

BS5400规范中的荷载及荷载组合

结合对英国规范BS5400中有关荷载规定的理解，就对国内桥梁设计具有重大参考价值的内容，从恒载、二期恒载、活荷载、荷载组合等方面进行了介绍，对于大跨度桥梁横向的动力分析有很好的帮助。     

高层建筑新增裙楼加固技术及结构静力荷载试验

某高层建筑完工后决定新增４６００ｍ＾２的裙楼,需对主楼地下室结构等主要部分进行加固处理。施工中采取了将顶标高－０．１８０ｍ的楼板梁两侧各增加一根梁组成复合梁等措施。试验表明在连接节点的设计方案合理,施工质量可靠。     

多种检测方法在奥林花园小区桩基检测中的综合应用

文章主要分析了合肥市奥林花园小区工程桩基的检测方案，提供了多种基桩常规检测方法在单个工程中综合应用的范例。     

Thermodynamic analysis of compression ignition engine using neat Karanja oil under varying compression ratio

Exergy analysis method has been widely used to evaluate the energy utilisation efficiency and potential of waste heat energy. The objective of the present investigation is to analyse the exergy efficiency, destruction of exergy, mean gas temperature, exhaust temperature, brake thermal efficiency and brake-specific fuel consumption of a single cylinder diesel engine using diesel and neat Karanja oil blends at different compression ratios (CRs) at full load and at different loads with a CR of 18. It is observed that 10% neat Karanja oil blend (K10) shows similar performance to diesel and better than 20% neat Karanja oil blend (K20). But K20 shows better performance at a CR of 18 as compared to 16. At higher loads, exergy efficiency and destruction of exergy are found more at a CR of 18 for all fuels. Destruction of exergy decreases and exergy efficiency increases at CR 18.     

公路预应力混凝土大悬臂盖梁的计算

通过上海A4高速公路跨越黄浦江的奉浦大桥引桥工程实例,介绍了公路预应力混凝土大悬臂盖梁的受力模式和设计计算方法,对计算结果进行了分析,得出了该方法合理可行的结论.     

后张法预应力混凝土简支梁桥的恒载挠度分析

结合工程实例,使用桥梁专用软件分析了预制简支梁的挠度影响因素,并从理论上建立模型,测试了混凝土养护龄期、预制主梁的存梁期及恒载和活载之比等对板梁变形的影响,为设计施工提供了一些依据。     

O-CELL 静载试桩法及其应用

O -CELL法是美国发明的静载试桩方法 ,其最大优点是可在试桩时量测出桩的端阻力和桩周侧摩擦力 ,具有经济、安全、方便等特点 ,但这种方法不适用于一些桩型 ,对长混凝土桩也不适用。     

基于(火用)分析的水源热泵系统运行优化

为了减少热泵系统运行的有效能损失,提高能量利用的完善度,在满足系统供冷、供热的可靠运行条件下,建立了水源热泵空调系统的压缩机、冷凝器、电子膨胀阀、蒸发器、冷凝器侧的水泵及蒸发器侧的水泵的(火用)损失数学模型,以总(火用)损失(热泵机组和水泵(火用)损失)最小为目标函数,对水.水热泵系统进行运行优化,得出相应的运行参数范围.     

某工程大直径钻孔灌注桩单桩竖向抗压静载试验分析

文章以肥西县某宾馆桩基工程为实例,对大直径钻孔桩单桩竖向抗压静载试验进行了分析,得出本次试验桩的单桩竖向抗压承载力特征值均满足设计要求。     

桥梁质量检测和静载试验

为了从强度、刚度稳定性和耐久性等方面判明八仙大桥的安全度,对质量病害有一个确切全面的了解,以便针对质量缺陷提出相应的技术对策,通过现场质量检测和荷载试验对本桥进行了技术状况评定,以保证本桥能安全运行和正常使用。     

Sensitivity of the total heat loss coefficient determined by the energy signature approach to different time periods and gained energy

In order to identify buildings that have energy saving potential there is a need for further development of robust methods for evaluation of energy performance as well as reliable key energy indicators. To be able to evaluate a large database of buildings, the evaluation has to be founded on available data, since an in-depth analysis of each building would require large measurement efforts in terms of both parameters and time. In practice, data are usually available for consumed energy, water, and so on, namely consumption that the tenants or property holder has to pay for. In order to evaluate the energy saving potential and energy management, interesting key energy indicators are the total heat loss coefficient K_tot (W/K), the indoor temperature (T_i), and the utilisation of the available heat (solar radiation and electricity primarily used for purposes other than heating). The total heat loss coefficient, K_tot, is a measure of the heat lost through the building's envelope, whereas T_i and the gained energy reflect the user's behaviour and efficiency of the control system.In this study, a linear regression approach (energy signature) has been used to analyse data for 2003-2006 for nine fairly new multifamily buildings located in the Stockholm area, Sweden. The buildings are heated by district heating and the electricity used is for household equipment and the buildings’ technical systems. The data consist of monthly energy used for heating and outdoor temperature together with annual water use, and for some buildings data for household electricity are also available. For domestic hot water and electricity, monthly distributions have been assumed based on data from previous studies and energy companies. The impact on K_tot and T_i of the time period and assumed values for the utilised energy are investigated.The results show that the obtained value of K_tot is rather insensitive to the time period and utilised energy if the analysis is limited to October-March, the period of the year when the solar radiation in Sweden yields a minor contribution to heating. The results for the total heat loss coefficient were also compared to the calculations performed in the design stage; it was found that K_tot was on average 20% larger and that the contribution to heating from solar radiation was substantially lower than predicted. For the indoor temperature, however, the utilised energy had a large impact.With access to an estimate of K_tot and T_i, an improved evaluation of the energy performance may be achieved in the Swedish real estate market. At present the measure commonly used, despite the fact that monthly data is available, is the annual use of energy for space heating per square metre of area to let.     

Building typologies as a tool for assessing the energy performance of residential buildings - A case study for the Hellenic building stock

Successful strategies towards minimizing the energy consumption and greenhouse gas emissions attributed to the building sector require knowledge on the energy-related characteristics of the existing building stock. Despite the numerous studies on energy conservation applications in buildings, current knowledge on the energy-related characteristics of the building stock still remains limited. Building typologies can be a useful instrument to facilitate the energy performance assessment of a building stock. This work is based on a harmonised structure for European building typologies (TABULA) developed for residential buildings, but the methodology may be extended to the tertiary sector as well. National typologies are sets of model buildings with characteristic energy-related properties representative of a country's building stock. The model buildings are used as a showcase for demonstrating the energy performance and the potential energy savings from typical and advanced energy conservation measures (ECMs) on the thermal envelope and the heat supply system. The proposed Hellenic residential building typology is presented for the first time along with an assessment of various ECMs that are used for an estimate of the energy performance of building stock in Greece in an effort to meet the 9% indicative national energy savings target by 2016.