共查询到20条相似文献，搜索用时 281 毫秒
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本提出了一各结构施工期设计基准风速的风险分析方法，运用该方法可以分析得出按年度出现设计基准风速的发生概率或风险率。 相似文献
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林忠 《福建工程学院学报》2002,(1)
针对砼楼板常见的裂缝现象 ,从现浇板截面有效高度损失和施工荷载效应调查入手 ,探究其对结构承剪抗弯能力的影响和规律 ,并对施工期砼楼板施工荷载效应进行结构分析和裂缝控制。 相似文献
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本文介绍了邹平县南水北调东线续建配套工程施工期环境影响评价分析。并论述了施工期具体环境保护措施。 相似文献
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赵辉 《杨凌职业技术学院学报》2013,(3):37-39
对水库工程而言,施工期洪水的排泄是十分重要的问题。处理不当就有可能使工程在一次洪水中功亏一篑。本文作者根据往年洪水发生的经验教训,预估施工期可能发生的超标洪水,对不同洪水频率形成的坝前滞洪库容作了推算,同时对相应的泄水设施的设计泄水能力及泄水过程进行了验算,为编制当年水库在施工期安全度汛方案作了依据考证。 相似文献
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本文主要从工作原理、如何布设、监测资料随机分析三个方面阐述了钢板计的整个实际应用过程。特别是其监测结果对校验引水压力钢管在施工期的设计荷载，以及了解温度对其影响程度，都起到了十分重要的作用。 相似文献
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匙静 《石家庄职业技术学院学报》2002,14(2):22-23,50
认为流水步距的定义应为相邻的两个施工班组相继投入施工的间隔时间，不包括组织间歇，技术间歇，搭接时间等时间间歇，指出了计算全等节拍流水施工期常用公式中的一些弊，并给出了经验公式。 相似文献
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输变电工程的建设对环境的冲击和破坏将直接影响到生态的恢复和平衡,重点探讨输变电工程建设过程中包括前期、施工期等的环境保护问题,以此提出输变电工程建设过程中的环境保护措施,提出在项目规划、设计时针对降低电磁环境、声环境影响等的措施;施工期自然环境、弃土等环保施工保护措施以减少生态环境的破坏,和对居住人群的影响。 相似文献
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谢守亮 《长江工程职业技术学院学报》1993,(2)
对葛洲坝大江电站从施工期至蓄水期的安全监测资料——水平位移、垂直位移(包括基岩变形)。软缝变形、缝面开合度、钢筋应力、扬压力和渗流量进行了全面分析。并从安全监测的角度对厂房结构的工作性态进行了评估,通过分析认为:各监测物理量符合实际情况,厂房结构设计合理,工作性态正常。 相似文献
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文章对广西田林县那比水电站库区水温进行了计算,找出其变化规律,为碾压混凝土在施工期和运行期的温度场和温度徐变应力的仿真计算分析提供重要的数据。从而采取合理的碾压混凝土坝体降温措施。 相似文献
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本文从公路工程开工前期、施工期和营运期各个阶段分析对沿线环境造成的影响,并针对性地提出相应的环保措施,减少对环境带来的不利影响. 相似文献
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A European pressurized reactor (EPR) steel containment liner structure is comprised of the cylinder part and the dome part. An introduction of the steel liner structure is presented, followed by studies on the key mechanical features of the construction process using a refined finite element method. The steel liner was divided into several modules and then assembled during construction. Firstly, the equipment structure used to hoist the liner module was optimized, the lifting lug was analyzed using a multi-scale finite element model; the wind speed limit during lifting was also studied. Subsequently, the effect of internal forces during assembly between the liner modules, the lateral pressure of fresh concrete, the non-uniform temperature load, and the wind load on the cylinder module was analyzed. According to the time-varying structural performance during continuous concrete pouring and the hardening construction, an “overlapping element and birth-death element” technique was adopted to analyze the deformation and stress of the long-span steel dome liner. In addition, the stability-bearing capacities of the dome structure during construction were also studied, which took into consideration the effect of the initial geometrical imperfections and the elasto-plasticity of the material. This study presents a reference in terms of the mechanics of the construction scheme and the safety of such a type of structure. 相似文献
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罗兆亮 《邢台职业技术学院学报》2007,24(5):81-83
本文针对PMPK设计软件使用过程中出现的问题，结合PKPM系列微机建筑结构CAD系统软件的应用，指出了建筑结构设计中应用PKPM存在的问题，分析了问题产生的原因，提出了今后设计中应注意的事项。 相似文献
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Factors such as errors during the fabrication or construction of structural components and errors of calculation assumption or calculation methods, are very likely to cause serious deviation of many strings＇ actual prestressing forces from the designed values during tension structure construction or service period, and further to threaten the safety and reliability of the structure. Aiming at relatively large errors of the prestressing force of strings in a tension structure construction or service period, this paper proposes a new finite element method （FEM）, the ＂tensile force correction calculation method＂. Based on the measured prestressing forces of the strings, this new method applies the structure from the zero prestressing force status approach to the measured prestressing force status for the first phase, and from the measured prestressing force status approach to the designed prestressing force status for the second phase. The construction tensile force correction value for each string can be obtained by multi-iteration with FEM. Using the results of calculation, the strings＇ tensile force correction by group and in batch will be methodic, simple and accurate. This new calculation method can be applied to the prestressed correction construction simulation analysis for tension structures. 相似文献
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本文在简述构式语法的基础上,分析了英汉习语习得的构式观,强调了在构式语法指导下英语习语习得过程中结构与意义整体信息的输入。探讨了构式语法对二语教学的启示,从而为英语教学的发展提供新的研究视角。 相似文献
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膜结构作为一种新型的结构体系,在大跨度空间结构中应用越来越广泛,本文依据多年的工程实践,论述了膜结构施工前、后的若干问题,详细的介绍了膜结构的加工制作方法和施工技术,总结了膜结构现场施工过程中的注意事项,为该类型结构的施工和制作提供了一定的依据。 相似文献
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在现浇框架结构中，混凝土工程质量直接影响混凝土结构乃至整个建筑的安全，在施工中经常发生一些质量通病，特别是在暑期施工中，混凝土的养护也影响到混凝土工程质量。混凝土工程质量控制良好有利于结构的安全性、美观性及企业的经济效益。 相似文献
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《International Journal of Educational Research》2003,39(1-2):113-131
In this article two studies on the use of diagrams in computer-supported collaborative learning are compared. Focus is on the way argumentative diagrams can be used during collaborative learning tasks, more specifically how diagrams support argumentative interaction between students when they discuss ill-defined topics. The main goal is to discover how diagram construction before discussion, and diagram construction during discussion, influence the way students explore the space of debate during discussion. Twenty pairs of 16/17-year-old students were randomly selected from 126 pairs. Ten pairs worked with a diagram before discussion and ten during discussion. The research showed that students use diagrams in very different ways, ranging from a means for talking to just a notebook. Our expectation that using a diagram during discussion leads to more depth in discussion than using one before discussion, was not confirmed. Possible explanations for this finding are structure of the task, and the way students interpreted the goal of the task. 相似文献
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It is important and difficult to control the temperature of mass concrete structure during high arch dam construction.A new method with decision support system is presented for temperature control and crack prevention.It is a database system with functions of data storage,information inquiry,data analysis,early warning and resource sharing.Monitoring information during construction can be digitized via this system,and the intelligent analysis and dynamic control of concrete temperature can be conducted.This method has been applied in the construction of the Dagangshan Arch Dam in China and has proven to be very convenient.Based on the decision support of this system and the dynamic adjustment of construction measures,the concrete temperature of this project is well-controlled. 相似文献