长螺旋桩机预钻孔在大直径管桩施工中的应用

针对大直径预应力管桩在施工中出现的挤土上浮现象,通过某工程的静载试验,提出了采用长螺旋桩机预钻孔在大直径预应力管桩施工中运用的方法,达到确保单桩竖向承载力的效果,解决了大直径预应力管桩防止施工中挤土上浮的问题。     

后张法预应力简支箱梁张拉伸长值计算及施工

针对兰新客专后张法预应力简支箱梁在预应力施工中遇到的问题进行了分析和研究,归纳出后张法预应力简支箱梁施工生产过程中预应力张拉伸长值计算、施加及封锚施工各阶段卡控要点,为今后类似工程施工提供了技术参考。     

浅谈后张法预应力张拉伸长量的计算与测定

结合有关资料和施工体会,对预应力筋张拉施工时伸长量进行了分析,并对伸长值实测结果的取用进行了介绍,从而更好地发挥预应力钢筋的作用.     

长束预应力在横琴二桥的应用及施工控制

现代桥梁的日益向大跨度化发展,预应力曲线长束的设计与施工是其一大特点。本桥采用74m长束单端张拉方案,预应力施工质量控制要求较高。     

引孔沉桩法在复杂回填土工程中的应用

本文介绍了某500kV变电站在锤击预应力管桩施工中,因沉桩困难而采用了引孔沉桩法处理的情况,并提出了对场地回填施工的建议及锤击预应力管桩施工中引孔沉桩应注意的问题。     

大跨长联梁桥预应力束摩阻系数研究

联长达520m的某黄河桥采用了预应力混凝土梁桥结构,基于《公路桥梁施工技术规范》,采用先进传感器,进行预应力束摩阻损失系数测定及研究。试验结果指导施工的同时,也表明试验方案的正确可靠性,试验方案可以为类似桥型设计及施工提供参考。     

宜昌预应力卵形消化池摩阻损失及张拉伸长值实测

为了解宜昌卵形消化池结构环向预应力筋的有效张拉应力,进行了预应力摩阻损失测试工作,并将测试束的张拉伸长实测值和计算值进行了对比。依照现场施工方法,摩阻损失测试分为成束预应力筋整束张拉和成束预应力筋单根分批张拉两种情况进行。实测结果可为该类结构的预应力设计和施工提供参考。     

预应力混凝土结构施工分析

主要分析了在预应力混凝土结构施工过程遇到的问题,并分析原因,对此类问题各种处理方法进行详细探讨,另外还对预应力损失的计算方法作了阐述。     

悬臂灌注连续梁桥预应力通长束施工技术

结合泰东河大桥工程实践,就悬臂灌注连续梁桥预应力通长束的施工技术进行了论述,分别介绍了预应力孔道成型,通长束的穿束及双控张拉等关键技术,为类似工程提供了指导。     

超大长细比预应力管桩施工质量控制——基于超深厚软弱地层中

结合工程实际施工案例,针对在超深厚软弱地质情况下超大长细比预应力管桩施工时存在的桩偏位、桩身倾斜、断桩等施工难点进行了分析,通过真空预压处理场地、设置消挤孔、合理部署施工顺序、控制预应力管桩焊接接头质量、控制沉桩速度、土方开挖保护管桩等措施,提高预应力管桩施工质量。     

Escalation of commitment in troubled IT projects: Influence of project risk factors and self-efficacy on the perception of risk and the commitment to a failing project

Past studies have indicated that project managers may be less likely to continue failing IT projects if they are able to perceive project risks accurately. Using the scenario of a failing IT project, a computer simulation-based experiment investigated the influence of individual self-efficacy and project risk factors on the perception of risk. Participants played the role of a project manager and managed a simulated IT project. The results suggest that project managers are likely to underestimate the risks of a project with endogenous risk factors as compared to a project with exogenous risk factors. Results of this study point to a ‘self-efficacy bias’ where project managers with higher self-efficacy may underestimate the risks of a troubled IT project as compared to project managers with lower self-efficacy. Further, risk perception mediated the influence of self-efficacy on the commitment to a failing IT project.     

浅谈高速公路建设项目的工程变更管理

分析了目前高速公路建设项目的工程变更管理现状及工程变更对高速公路建设项目的影响,提出了加强高速公路建设项目工程变更管理的若干技术要点,从不同方面论述了强化高速公路工程变更管理、控制工程投资的有效方法和途径,以实现工程预期目标。     

某医院改造手术部项目的风险管理

对手术部改造项目实行风险管理;结合项目实例,依据WBS工作任务包对此项目进行风险管理;实现了风险管理的目的;手术部改造项目需要针对项目实际,利用项目风险管理,达到项目全过程的风险控制.     

Relationships between project governance and information technology governance and their impact on project performance

This research endeavors to address the question of how to enhance project performance through exploring the relationships among information technology (IT) governance, project governance and project performance. The research utilizes an empirical survey methodology. The survey of 533 working professionals in various industries renders 282 usable responses or a response rate of 53.91%. The results suggest that both IT governance and project governance have a positive impact on project performance. Moreover, we found that three dimensions of IT governance (i.e., strategy setting, value delivery, and performance management) are positively associated with project performance while all three dimensions of project governance (i.e., portfolio direction, project sponsorship as well as project effectiveness & efficiency, and disclosure & reporting) are positively associated with project performance. Additionally, the alignment between IT governance and project governance is also found to be positively associated with project performance. These findings provide evidence to project management professionals in regard to IT governance and project governance being part of the operational strategy in facilitating the success of projects. It also demonstrates the importance of the alignment strategy between IT governance and project governance in enhancing project performance.     

Does project management matter? The relationship between project management effort,complexity, and profitability

The purpose of this study is to explore the causal impact of project management effort on project profitability (i.e., profit on sales) for varying degrees of project complexity in an engineer-to-order (ETO) project setting. We use a sample of 917 projects’ status reports of a large firm that offers ETO products coupled with a control function approach to empirically investigate the causal effect of project management effort on projects’ profitability. Furthermore, we investigate the marginal impact of project management effort and its effect for different degrees of project complexity. Our results reveal a positive but diminishing impact of project management effort on project profitability. Furthermore, we find that higher project complexity jeopardizes project profitability. However, project management's marginal impact increases with increasing project complexity, ultimately leading to higher returns of more complex projects. While previous research provided correlational evidence between project management and project success, this study is, to the best of our knowledge, the first to demonstrate a causal impact of project management on profitability. The results offer unique insights into the economic benefits of project management while taking into account the complexity of the projects. The study confirms the benefits of project management efforts regarding project profitability and underlines the high relevance of project management for complex projects, thereby underlining the importance of contingency theory. It shows that firms can compensate higher ETO customization and higher project complexity through higher project management effort.     

基于造价控制的最优承发包模式选择

目前,国内外工程项目的承发包模式众多,在对国内外各种承发包模式综合研究的基础上,将其分成了包括传统的 DBB 模式、工程总承包模式和项目管理承发包模式三大类别,分析了各种承发包模式的特点和适用范围,为了更好地实现项目的既定目标,针对不同的项目承发包模式,提出了不同的造价控制方法。并具体分析了工程项目各种承发包模式的特点及与项目造价控制的关系,试图在项目质量、工期和造价目标相互平衡的条件下,寻求最有利于投资者进行造价控制的最优承发包模式。     

浅谈工程中的变更与索赔

介绍了工程造价的构成 ,工程变更的原因、程序和分类以及工程索赔的原因、原则和程序 ,提出了工程索赔时的注意事项 ,提出了工程的变更和索赔在工程应用中的重要性     

基于项目干系人的管理策略

一个项目的成功是由诸多因素构成的。本文着重论述一个项目管理不应忽视的问题———项目干系人的管理策略,主要涉及了如下三个问题:哪一个项目干系人对建设项目是最重要的,几种类型的项目干系人对建设项目产生什么样的影响,在努力满足项目干系人需求和期望的同时项目人力资源管理应该采取什么样的策略。     

工程项目组织变迁框架研究

随着工程项目建设的开展,各种参与组织加入或退出工程项目组织系统,因而在工程项目全寿命期内存在工程项目组织的变迁。工程项目组织变迁的研究须结合工程项目及其组织的特殊性。以工程项目组织及其变迁的特性为立足点,给出工程项目组织变迁的定义,并阐述其系统结构过程、变迁形式、一般机理、内外环境分析及特点。     

谈建设工程工程量清单计价规范项目特征描述

阐述了工程量清单项目特征描述的重要意义,对项目特征的具体描述作了探讨,比较了项目特征与工程内容的区别,并发表了一些看法,以提高人们对工程量清单项目特征描述的重视,使工程量清单计价量准价实。