含轴向内表面裂纹管道极限载荷有限元计算

获得结构的极限承载能力,是结构极限分析的基本任务。利用三维弹塑性有限元技术,通过新的极限载荷确定方法一停机点法,对内压作用下含轴向内表面裂纹管道的极限载荷进行了系统的计算与分析。结果表明：无量纲极限内压（pB／pP）主要和裂纹深度与管道厚度比（A／T）、管道厚度与直径比（T／DO）有关,裂纹长度与管道直径比（L／DO）对其影响可以忽略。建立了含轴向内表面裂纹管道无量纲塑性极限内压数据库,可供缺陷管道安全评定时参考。     

Influence of Light Distribution and Installation Style of Luminaires on Power Consumption and Lighting Effect of Tunnel Lighting北大核心CSCD

Light distribution (LD) and installation style of luminaires affect the utilization factor (UF) of luminaires, and the UF affects the luminaire power and road pavement illuminance and further the power consumption of illu- minating system and the luminous effect of road pavement. An UF model of tunnel lighting was established based on the luminaire LD data and installation parameters, in which four LD styles were adopted. For each LD the parame- ters optimization and simulation were conducted regarding four installation styles, e.g. central style, offset-of-vault style, symmetric style and staggered style. The energy-saving and the lighting effects of each LD and luminaire in- stallation style at the tunnel middle zone were studied. The results show that symmetric luminaire installation is the most energy-saving style and has the best lighting effect than the other three luminaire installation styles; the lighting effect of central luminaire installation is the second best; staggered luminaire installation is the most energy-intensive style and has the worst lighting effect except for some special-shaped LD; waterdrop-shaped LD is the most suitable one along transverse direction of tunnel and applicable to the central, offset-of-vault and symmetric luminaire instal- lation styles; symmetric butterfly-shaped LD is the most suitable one along longitudinal direction of tunnel and appli- cable to the central, offset-of-vault, staggered and symmetric luminaire installation styles; with waterdrop-shaped LD along transverse direction and symmetric butterfly-shaped LD along longitudinal direction, they are suitable for the above four luminaire installation styles, and have better energy-saving and lighting effect; as for the LD with symmetric and oblique curve, it’s better for the profile of oblique luminaire distribution to be comply with that along tunnel transverse direction, and it is suitable for the symmetric and offset-of-vault luminaire installation styles. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

地铁系统设备房安装装修常见问题与解决思路

总结了国内地铁系统设备房安装装修中常见的施工现场协调难、成品保护与损失纠责难、隐患整改难等问题.从系统设备房安装装修设计、分标、施工组织与管理等方面提出了对这些问题的解决思路.     

船舶设计中的电缆桥架宽幅的决定方法

为了在电气详细生产设计中能够快速并准确地选择合适的电缆桥架,通过结合电缆模型的排列并将之总结成运用公式,使设计者在选择电缆桥架时能够提高设计效率及正确性,船厂的应用表明,这种方法非常有效并可以满足船级社的要求。     

跨座式单轨交通轨道道岔安装工艺

对已经成功地投入商业运营的城市快速高架单轨交通轨道系统道岔设备的安装工艺进行了较为深入的研究,提出了适合于我国国情的施工工艺。结合重庆轻轨较—新线跨座式单轨交通进口道岔设备安装工程,详细叙述隧道内道岔设备和小半径大坡度区段道岔设备的安装过程。     

隧道衬砌施工缝止水带施工工艺探讨

为规范隧道施工缝和沉降缝止水带施工,首先介绍了橡胶止水带的应用范围和特点,然后介绍了环向止水带和纵向止水带的操作步骤和安装要求。通过采用钢筋U型卡和方木支架对止水带进行固定以及选用合理便捷的连接形式,使得止水带连接和安装问题得到了有效解决,消除止水带质量通病,为隧道工程的止水带施工提供借鉴。     

沥青混合料搅拌设备的安装调试

沥青混合料搅拌设备是修筑公路沥青路面材料的关键生产设备,其整体性能涉及了设计、制造、安装、调试以及人员培训等多个方面分析了在保证设计和制造质量的前提下,设备售后的安装、调试以及人员培训方面对其后期使用和整体效益发挥方面的影响,可为此类设备的售后工作提供有益借鉴     

三塔悬索桥中塔上横梁合龙施工技术

武汉鹦鹉洲长江大桥为（200＋850＋850＋200） m 三塔四跨悬索桥结构,中塔采用钢-混凝土叠合结构,其中钢塔塔柱、上横梁分段吊装,节段间采用高强度螺栓连接。中塔上横梁在横桥向分为两段,采用分段无支架悬臂安装,使用小型调节工件配合进行节段合龙控制。通过建立有限元计算模型,模拟上横梁施工过程中各主要工况下塔顶变形及合龙口位移值。工程实施中,利用有限元计算结果,对施工过程进行控制,顺利实施了上横梁合龙施工。     

上海长江大桥泛光灯平台安装施工

为了夜间船只通航安全,在桥梁通航孔的辅墩上安装泛光灯平台。该文通过上海长江大桥工程施工实践,介绍了安装方案选择过程,以及平衡架施工过程的安全技术管理,可为今后同类型工程施工提供相应的参考。     

公路滑坡及边坡病害整治工程补充预算定额的编制

简要介绍了预应力锚索的施工工艺、工作内容及编制补充预算定额的计算过程、定额用量,对公路滑坡及边坡病害整治工程的造价控制,起到一定的参考作用。