A Study on Factors Influencing Cost Overrun in High-rise Building Construction across India

Cost overrun is a common problem in construction projects worldwide.Most Indian construction projects,particularly those involving high-rise buildings,have had severe cost overruns.For managers,architects,engineers,and contractors,completing building projects within the specified cost budget has become the most important and hard assignment.Since it is common for high-rise building projects to go over budget,the aim of this study is to find out the causes of cost overruns and provide effective measures.The study found 70 cost overrun factors based on a comprehensive literature review and expert opinions.A Google form questionnaire was distributed to 150 construction professionals across India.After following up,101 of the 150 responses were received.A five-point Likert scale was used and the acquired data was analyzed and ranked using the Relative Importance Index(RII)technique.According to the findings of RII,the top ten critical factors influencing cost overruns were frequent change orders during construction by the owner,delay in construction,escalation of material prices,market inflation or deflation,rework,frequent changes in design,inaccurate evaluation of the project timeline,unforeseen ground condition,inaccurate quantity take-off,and delay in progressive payment by the owner.Spearman’s rank correlation test revealed that there is a very significant relationship between the rankings of factors provided by the owner,the consultant,and the contractor.In addition,a factor analysis tool in the SPSS software was also used to categorize the seventy factors into sixteen core components.The top ten critical factors were presented to subject matter experts,and their suggestions were being compiled.These results are expected to help construction professionals minimize cost overruns,improve cost control measures,and initiate future research.

Application of predictive control scheduling method to real-time periodic control tasks overrun

Based on the abort strategy of fixed periods, a novel predictive control scheduling methodology was proposed to efficiently solve overrun problems. By applying the latest control value in the prediction sequences to the control objective, the new strategy was expected to optimize the control system for better performance and yet guarantee the schedulability of all tasks under overrun. The schedulability of the real-time systems with p-period overruns was analyzed, and the corresponding stability criteria was given as well. The simulation results show that the new approach can improve the performance of control system compared to that of conventional abort strategy, it can reduce the overshoot and adjust time as well as ensure the schedulability and stability.

Transient dynamic analysis and comparison on wedging processes of overrunning clutches with different contact surfaces

The effects of contact surface on dynamic wedging behavior of the roller and inner-ring of the overrunning clutch in a dual-turbine torque converter were investigated to reveal the friction self- locking mechanism and dynamic process. Planar strain clutch models including roller, inner-ring and outer-ring were built, and transient wedging process was analyzed with an explicit dynamics meth- od. The modeling of stress and strain distribution and variation of two kinds of contact surfaces show that there are three stages named slipping, wedging and binding respectively during whole wed- ging process. Meanwhile the geometric structures of contact surfaces greatly influence the peak stress and strain distribution of the wedging process of the roller and inner-ring. The load bearing performance of contact surfaces with logarithmic spiral curve is better than that with straight line. Our study provides theoretical foundation for design and further optimization of wedging contact surface of an overrunning clutch in a dual-turbine hydrodynamic torque converter.

Effect of Camel Milk Fortified with Dates in Ice Cream Manufacture on Viscosity, Overrun, and Rheological Properties during Storage Period

The effect of using camel milk with 2 dates types (Sokary & Al-Khalas), in 3 forms (paste, pieces, and molasses), with 2 different concentrations (5% & 10%) in the manufacturing of ice cream on its viscosity, overrun%, rheological and melting properties during storage period up to 60 days at -18&#176C was studied. It was noticed that there are higher mean of viscosity values (cp) when using “Al-khalas” dates paste 5% and 10% followed by samples with “sokary” paste then samples with molasses in ice cream samples compared to those with added date’s pieces of either “Sokary” or “Al-khalas”. There are significant differences of overrun values between all treatments and samples with the added date paste of either “sokary” or “Al-khalas” which recorded the lowest values. Increased melting resistance and good qualities as heat shock and melting properties were significantly better for the samples with added dates pieces or paste unlike the molasses. The storage effect is obvious decline, especially when using dates molasses.

Study of Factors Causing Time and Cost Overrun in Pre-Construction Project (A Case Study of Malaysia)

Cost and time overrun are the key troubles of any improvement ventures. These troubles are inflicting the terrible end result in the development of kingdom monetary improvement and thriving. To overcome these problems, the?paper examines predominant impact on elements causing the mission postponement and cost. A poll review was led for the situation study embracing various information-gathering procedures. The discoveries from the contextual investigation uncovered that the most persuasive factors in Malaysia:?1) contractor’s inappropriate arranging, 2) poor site the board, 3) deficient contractual worker experience,?are the most powerful factors. This paper has likewise broken down the normal and least effective of the postpone variables causing task deferral and cost overrun in Malaysia. It likewise infers that there are various measures as per the idea of deferring components to decrease the effect on task postponement and cost overruns in the development industry.?There are significant factors in the control of time overrun that would be actual thought related to know and tackle in great impact to improvement rate which may additionally no capacity that be recovered. Thirty (30) massive development extensions in Malaysia were exceptional coping with time overrun at some stage in development. Out of 30 undertakings, 17 (56.67%) ventures had been introduced by using 1100 days’ time overrun, 5 (16.67%) extensions in the middle of a hundred and one to 200 days, 5 (16.67%) ventures?201 to 300 days while three (10%) ventures have been deferred for timeframe over 300 days.

Avoiding Cost Overruns in Construction Projects in India

The main aim of this paper is to identify the major reasons for cost overruns in construction projects in India as well as the critical success factors that are helping to avoid the cost overruns. For this, the existing literature is reviewed and critical success factors are identified. Based on them, survey questions and interview questions are prepared. The findings supported the proposed hypothesis, i.e., lack of certain critical success factors leads to cost overruns in construction projects in India. They also confirmed the proposed proactive and reactive strategies of some researchers. The effective critical success factors include appropriate planning in the initial stages, skills of contractors and architects, good relationship and regular coordination among client and contractor, and early contribution of contractor with the project. The ideal methods that help to reduce cost overruns include efficient planning, proper management of site and supervision of the project, suitable planning and arrangement of project, proper methods for construction, regular meetings on development of the project, and hiring proficient subcontractors and suppliers.

Project Team Perception of Causes of Building Cost Overruns： A Reflection in Tanzania

The paper provides an empirical insight into the significance of shared cognition reflected in the perception of key actors in selected construction projects. It has explored how clients, consultants and contractors prioritize causes of cost overrun in building projects in Tanzania and measured the statistical variance in their order of rank. A total of 55 respondents were selected from public projects that had experienced cost overruns. The results show an inclination of the top 4 causes of cost overrun being technical and originate from internal sources. The Spearman correlation coefficient established a strong positive correlation in the ranking of causes of cost overrun in construction project by clients, consultants and contractors, suggesting a shared cognition is in place for the project team. The outcome provides a good base for contemplating success of mitigation measures for cost overruns and reiterates the significance for a shared cognition for project team success.

Seem to overrun on time and budget for engineering projects

In this thesis,construction industries face with the major challenges are cost overruns and time delays, which have existed in most of projects, especially in developing countries. Construction projects and the environment are increasingly complex, thus it has greater demands on project managers and cost managers that deliver processes on time. However the process of construction is limited to unforeseeable and variable factors, resulting from many sources. The aim of the report is to analyze determining factors about causing budget overrun and time delays by reviewing and identifying past cases. Furthermore, the construction process is made up of three critical phases, i.e. conception, design, construction. Generally, the majority of time delays and cost overrun happen in the period of construction, where many factors are always unforeseeable, and time delays usually associate with cost overruns. （Chan and Kumaraswamy, 1997）

Research on Cost Overrun Risk of Construction Phase of Vietnam Highway International Contracting Project

Recently, the highway construction projects increase rapidly in Vietnam and most of them are international contracting projects. It results serious negative influence on the local government and enterprises that the common cost overrun of projects, and the risk factors of it is different in the different countries, different stages and projects types. So in this paper, we generate an evaluation index system of highway construction projects cost overrun risk in Vietnam in the perspective of different project participants, and also evaluate the effects of these factors in method of regression analysis. The empirical results confirmed 7 main factors that have aggravated cost overrun risk in construction stages, e.g. survey and design scheme risk. In final, the corresponding suggestions are proposed to reduce the project cost overrun risk.

New type of overrunning clutch based on curved-plate compression-torsion metamaterial

Overrunning clutches are unidirectional drive mechanisms that are widely used in transmission systems.However,existing overrunning clutches have complex structures,require high preparation accuracy,and fail after a certain degree of wear.To address these issues,we propose a new type of overrunning clutch consisting of a conical structure and novel compression-torsion conversion(CTC)metamaterial with curved plates.Theoretical calculations are employed to guide the material distribution and ensure the deformation coordination of the curved-plate CTC metamaterial for greater ultimate torque.The transmission mechanism of the proposed overrunning clutch is derived to guide the parameter selection of the CTC metamaterial and the conical structure.Experiments and finite element simulations reveal that the curved-plate CTC metamaterial features excellent CTC efficiency,flexibility,and transverse stiffness,which is conducive reducing the resistance of the overrunning state and ensures stability during operation.The unidirectional transmission system constructed with the new overrunning clutch shows reliable performances under working and overrunning states.The constructed overrunning clutch provides an effective one-way transmission method.The clutch with simple construction and self-compensated ability for wear exhibits great potential in miniaturized and lightweight equipment or robots.

斜撑离合器环形弹簧径向刚度计算

斜撑离合器在机械领域及航空动力系统起着重要作用,弹簧的径向刚度是影响斜撑离合器脱开转速和楔合性能的重要指标。斜撑离合器弹簧的径向刚度尚无可靠的计算方法,因此将弹簧等效为圆环,推导出弹簧径向刚度的理论计算方法,并通过仿真和试验验证了理论计算的正确性。

天山中段2次6级地震前钻孔应变高频异常分析

2014年以来,天山中段分量钻孔应变仪空前增多,这些高采样率的应变观测资料蕴含着丰富的构造信息。如何从高采样率观测资料中提取有效的前兆异常信息,是分析研究人员亟待解决的问题。文章通过对天山中段分量钻孔应变观测数据进行S变换和超限率分析发现,在天山中段2次6级地震前有5套应变资料出现高频信息异常。这些异常均在震前出现,随后达到峰值,临震前或地震后衰减,其中短周期异常信号主要集中在10~720 min频段,且S变换与超限率分析结果具有很好的同步性。结合精河地震震源区及附近的GPS分析结果,发现高频异常信息的分布与该地区地壳运动场具有很好的一致性,进一步验证了高频信息异常的可信度。

工程造价超预算的原因分析和控制方法研究

在工程项目实施过程中,工程造价控制成为项目管理中的关键环节。本文从工程造价预算控制有益于项目顺利结算、有利于项目合理投入、有助于减少变更数量三个方面阐述了其意义。提出了造成超预算是因为施工组织设计脱离实际、工程施工进度失去控制、项目成本管理缺乏力度三个主要原因,提出了相应的控制方法,应严审施工组织设计以减少施工变更、严控工程施工进度以降低延期消耗、强化预算控制意识以提升投入效能。

高速斜撑超越离合器楔合动态响应研究

针对斜撑式超越离合器高速楔合容易产生故障的实际情况,对其楔合动态过程进行研究。工作过程中,斜撑式超越离合器内部楔块之间、楔块与内外环间以及各部件同保持架间存在碰撞。首先基于Hertz接触理论,求解了碰撞刚度,为明确各参数对高速斜撑超越离合器动态响应的影响程度,建立了包括楔合延迟时间、冲击力矩、最大转速差等在内的评价指标。同时,将高速斜撑超越离合器的楔合动态过程进行划分,以研究几何参数对不同响应阶段的影响。最后,开展了楔块与内环的摩擦条件、弹簧力、碰撞刚度、阻尼和负载等对高速斜撑超越离合器楔合动态响应的研究。结果表明,不同参数对所定义的评价指标的影响程度不同,极端情况下可导致楔合失败。该研究可为工程实践提供一定的理论参考和指导。

SINAMICS SL150磁通调节器输出超限分析与处理

本文结合日照钢铁控股集团有限公司1580mm热连轧精轧主传动系统升级改造之后出现的磁通调节器输出超限进行分析,提出解决方案,为今后出现类似的故障处理提供参考。

光伏与智能软开关协同的柔性配电网电压优化控制评述

随着光伏渗透率的提高和电力电子设备的大规模应用,近年来光伏与智能软开关(Softopenpoint,SOP)协同电压优化控制的相关研究已广泛开展并取得了丰硕成果。介绍了柔性互联配电网的内涵、定义及主要组成形态,提出了含光伏及SOP的柔性互联配电网协同整体控制架构,分别对电压协同优化模型、控制架构、控制方法进行了分析和梳理。综述了多设备多时间尺度协调电压优化控制、计及源荷不确定性的鲁棒电压优化控制、无模型数据驱动自适应电压优化控制3种电压优化控制方法的研究现状。在此基础上从控制策略、控制目标、应用对象3方面展望了光伏与SOP协同的柔性互联配电网电压优化控制的未来研究方向。

现代奥运会场馆治理的历史进程、多重困境与消解之道

奥运场馆的超大规模与巨额成本使奥运会的举办频遭诟病。运用文献资料、逻辑分析等方法,对百年奥运场馆数量波动上涨、使用更新优化、布局模式转换、配套迭代升级的状况及致因进行解析,认为场馆规划有失致使额外成本攀升,场馆利用不佳导致场馆荒废闲置频现,办奥挤出效应招致反对浪潮频发,场馆治理不当引致生态破坏屡现,据此提出若干消解策略:超前规划场馆,规避奥运场馆赛后“白象化”;注重赛后利用,促进奥运场馆发展可持续;倡导节俭办赛,探索场馆多元利用新举措;注重低碳环保,追求场馆治理环境正影响。

基于Apriori算法的飞机冲偏出跑道诱因挖掘

为加强民航客机飞行运行全过程的安全管理,减少飞机起降阶段冲偏出跑道事件发生的概率,对冲偏出跑道事件中的诱发因素进行定性和定量分析,根据事故事件特点,建立起降阶段飞机冲偏出跑道事件诱因分析体系,对不同类型的事件进行布尔离散化,采用Apriori算法对飞机冲偏出跑道数据集开展关联分析,挖掘出不同诱发因素之间的关联规则。以国内某航空公司波音737机队在2001-2021年间冲偏出跑道数据进行分类和识别;运用Apriori算法建立数据挖掘仿真模型;使用MATLAB编程迭代计算,找到飞机冲偏出跑道诱因中有强关联的因素,并保留其数据。结果表明,当飞机故障时,有28.77%的概率会出现飞行员操作有误;当道面积雪时,有23.64%的概率会出现违反标准操作程序;当飞行程序设计不合理时,有22.84%的概率会出现飞行员判断有误;当飞机故障时,有20.65%的概率会出现飞行员控制有误;当跑道道面湿滑时,有20.12%的概率会出现飞行员控制有误。

某三甲专科医院DRG超支病例住院费用结构研究

目的:通过分析天津市某三甲专科医院DRG超支病例的费用构成及其变化规律,旨在为医院费用结构优化、管理效率提升及成本控制提供依据。方法:研究对象为2023年该医院DRG超支金额排名前15的病组,采用结构变动度法分析费用影响因素,并通过灰色关联分析评估各费用分项与总费用的关联度。结果:从7840例病例中筛选出2822例DRG超支病例(占35.99%),主要超支集中在RG13、ES31、HR11、EX23、EX21组。费用主要包括药品费、影像检查费、化验费和治疗费,且这些费用分项在超支与正常病例间存在结构差异,对住院费用的影响各不相同。灰色关联分析揭示影像检查费、化验费在11个DRG组中与总费用关联最强,药品费在3个组中关联最强,床位费在1个组中关联最强。结论:通过调整影像检查费、化验费、药品费和治疗费,可以有效控制医院成本,减少患者住院费用,优化医保基金利用,实现医院、患者和医保基金的共赢。