scholarly journals Compare Among Methods for Re-Habitation Damaged Concrete Beams-Ferrocement, Steel, FCRP and Nano-Materials Sections

2022 ◽  
Vol 961 (1) ◽  
pp. 012028
Author(s):  
Noralhuda M. Azize
Keyword(s):  
Project Management ◽  
Concrete Beams ◽  
Research Result ◽  
Concrete Structures ◽  
Future Research ◽  
Ecological Design ◽  
Nano Materials ◽  
Nano Material ◽  
Project Management Professionals ◽  
Steel Section

Abstract The complicated and costly of concrete structures as well as the exposure to risk, owing to several factors such as ecological, design and construction, has resulted in a wide variety of methods for residential concrete structures, such as ferrocement sections technology, steel section technology, FCRP technology, and nano-material technologies. In this article the four approaches employed for rehabilitation of damaged concrete were compared. The questionnaire is given to 100 construction engineers and project management professionals to determine their preferred methods and advise them on their strength, effort, time and cost. To confirm the results, the researcher conducted an experiment to compare among these methods. research result, recommendations for future research, and conclusions were discussed in detail.

Project Management Software Usage Patterns and Suggested Research Directions for Future Developments

1998 ◽  
Vol 29 (2) ◽  
pp. 19-28 ◽  
Author(s):  
Bruce Pollack-Johnson ◽  
Matthew J. Liberatore
Keyword(s):  
Project Management ◽  
Future Research ◽  
Demographic Information ◽  
Research Directions ◽  
Management Software ◽  
Professional Societies ◽  
Modeling Techniques ◽  
Project Management Software ◽  
Project Management Professionals ◽  
Usage Patterns

Although project management software is very visible in publications of the professional societies, it has not been known how much and why it is actually used by project management practitioners, what modeling techniques are used, how such use has evolved over time, and what are the needs of project management professionals for future research. To fill this gap, we designed a survey to gather such information as well as basic demographic information.

Anchorages of stirrups under transverse tension in concrete - development of a design model

2019 ◽  
Author(s):  
Mirhat Medziti ◽  
Daia Zwicky
Keyword(s):  
Crack Width ◽  
Concrete Beams ◽  
Tensile Force ◽  
Concrete Structures ◽  
Experimental Tests ◽  
Reinforced Concrete Beams ◽  
Design Model ◽  
Hook Effect ◽  
Internal Forces ◽  
Negative Bending

<p>According to Swiss code SIA 262 "Concrete structures", stirrups of reinforced concrete beams must "surround the tensile longitudinal reinforcement" and must "be anchored to mobilize the static height of internal forces". For existing concrete structures, Swiss code SIA 269/2 provides stirrup detailing requirements while limiting these directives for stirrup anchorage to the compression zone. In zones of negative bending, these requirements are often not satisfied for execution reasons. This question is addressed in a largely experimental Ra&amp;D project. Anchorage tests were performed and analyzed, with a total of 144 tests on 9 concrete beams. These underwent a longitudinal tensile force up to 1’000 kN to simulate transverse cracking at stirrup anchorages in negative flexure zones. The study parameters are crack width (0, 0.4 and 0.9 mm), stirrup diameter (10 and 14 mm), bar ribbing (smooth and ribbed) and hook angle (90°, 135°, 180° and straight bars). A design model based on the "tension chord model" (TCM) developed at ETH Zurich is proposed. This simple and practical design model has proved ist effectiveness to consider bond effects. Reduction factors for bar diameter (k<sub>Ø</sub>), relative bar ribbing (k<sub>fR</sub>), hook effect (k<sub>θ</sub>) and crack width (k<sub>w</sub>) were taken into account for calibration. Results of analytical calculations are coherent with experimental tests.</p>

Internal projects as strategic tools: an organisation-level perspective and a research agenda

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Torbjørn Bjorvatn
Keyword(s):  
Project Management ◽  
Theory Development ◽  
Future Research ◽  
Content Type ◽  
Theoretical Contribution ◽  
Research Areas ◽  
Linear Relationships ◽  
Strategic Role ◽  
And Performance

PurposeThe purpose of this conceptual paper is to describe and explain how organisations use internal projects to implement organisation-level strategy objectives.Design/methodology/approachTheory development with an emphasis on explaining key constructs and their mutual relationships. The theoretical contribution is represented in a diagram along with a detailed verbal account.FindingsThe paper develops a dynamic, cross-level framework to illustrate the organisational processes and outcomes that determine project-based strategy implementation within a single organisation. The interplay between the base organisation and the project, and benefits realisation were singled out as key future research areas. The proposed framework engages with central discourses in the fields of project management, strategic management, innovation studies, knowledge management and organisation studies.Research limitations/implicationsOnly the contours of an organisation-level theory of strategically motivated internal projects are outlined. Future research must elaborate on the complexities, the non-linear relationships and the boundary conditions that follow from the proposed framework.Practical implicationsManagers are alerted to the strategic role of internal projects, how these projects help connect strategy and performance and what the accompanying organisational processes and outcomes look like.Originality/valueThe paper constitutes an early conceptual treatment of strategy-driven internal projects as a distinct project category, thus addressing a major knowledge gap in project studies. Organisational project-management theory is extended with suggestions for future research.

scholarly journals Support for the Development of Technological Innovations at an R&D Organisation

2021 ◽  
Vol 13 (22) ◽  
pp. 12469
Author(s):  
Beata Poteralska
Keyword(s):  
Technology Assessment ◽  
Research Result ◽  
Innovation Process ◽  
Research Problem ◽  
Future Research ◽  
Technological Innovations ◽  
Original Matrix ◽  
Organisational Capabilities ◽  
Theoretical Approaches ◽  
Innovation Processes

Effective development of technological innovations requires efficient management at the stages of their generation, realisation, and their implementation. For this aim, concepts such as foresight, technology assessment, and organisational capabilities assessment can be applied; however, so far they have been used mainly individually or sometimes combined but to a very limited extent. Moreover, they are not used comprehensively, but only selectively, e.g., at some stages of the innovation processes. The research problem undertaken in the paper concerns the effectiveness of the integration of these concepts: future research (mainly foresight), technology assessment, and organisational capabilities assessment for the needs of supporting innovation processes. The paper is aimed at presenting an original approach assuming the integration of the aforementioned triad. The proposed approach has been developed individually by the paper’s author on the basis of (1) state of the art analysis comprising both theoretical approaches and practical examples of individual and combined application of the concepts analysed, and (2) the author’s practical experience resulting from research projects conducted collectively. The research result comprises an original matrix approach where the individual concepts of the triad are applied in a way enabling their mutual complementation at all successive stages of the innovation process. The approach proposed comprises modules referring to the succeeding stages of the innovation process, namely generation, realisation and application of technological innovations. The areas of the approach application and possible directions of its further development are presented.

scholarly journals Numerical and experimental investigations of steel-concrete beams with thin-walled section

Vestnik MGSU ◽  
2019 ◽  
pp. 22-32
Author(s):  
Farit S. Zamaliev
Keyword(s):  
Experimental Data ◽  
Computer Simulation ◽  
Strain State ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Stress Strain ◽  
Stress Strain State ◽  
Numerical Studies ◽  
Field Samples ◽  
Thin Walled

Introduction. Conducted is to the evaluation of the stress-strain state of the steel-concrete beams with thin-walled section. In recent times, steel-reinforced concrete structures have become widely used in civilian buildings (beams, slabs, columns). Thin-walled section have not found wide application in steel concrete structures, unlike steel structures. Presents the results of numerical studies of beams consisting of concrete, anchors and steel beams. Two investigating of the location of anchors are given. Numerical investigations are presented of steel-concrete beams with thin-walled section based on numerical studies. Testing procedure and test result are given. Results of calculations, comparison of numerical and experimental studies are presented. Materials and methods. For full-scale experiments, steel I-beams with filling of side cavities with concrete were adopted, screws are used as anchor ties, with varied both the lengths and their location (vertically and obliquely). As steel curved C-shaped steel profiles were used steel profiles from the range of the company “Steel Faces”. ANSYS software package was used for computer modeling. A total of 16 steel concrete beams were considered, for which the results of strength and stiffness evaluation were obtained in ANSYS. Results. The data of the stress-strain state of beams on the basis of computer simulation are obtained. The results are used for the production of field samples. Data of computer simulation are compared with the indicators of field experiments. Conclusions. The stress-strain state of steel-concrete structures was studied on the basis of numerical and experimental data. The proposed calculation method gives good convergence with the experimental data. Anchor connections made from self-tapping screws can be used in studies for modeling in steel-concrete beams structures and other anchor devices, ensuring the joint operation of concrete and steel profiles in structures.

scholarly journals Review on Magnetohydrodynamic flow of nanofluids past a Vertical plate under the influence of Thermal Radiation

2021 ◽  
Vol 850 (1) ◽  
pp. 012037
Author(s):  
J ShanthaSheela ◽  
A David Maxim Gururaj ◽  
Mohammed Ismail ◽  
S Dhanasekar
Keyword(s):  
Thermal Radiation ◽  
Vertical Plate ◽  
Physical Nature ◽  
Industrial Applications ◽  
Future Research ◽  
Nano Materials ◽  
Governing Equations ◽  
Distinctive Features ◽  
Highly Nonlinear ◽  
Nano Fluids

Abstract Nanofluids are the fluids containing nano materials, with interesting properties, and the distinctive features have shown unprecedented potential for many Industrial applications. Nano fluids have been receiving great attention in recent years for heat transfer applications in industrial processes. In literature, the highly nonlinear governing equations involved in the study of MHD nanofluids flow with thermal radiation past a vertical plate under varying physical nature are solved using numerical and analytical schemes. It is noted that due to the complexity of the governing equations, numerical schemes are more preferable than analytical schemes. The authors have taken effort in registering various forms of governing equations involved in the above studies, its impact on velocity and temperature field. This paper also tries to identify the research gaps and pave way for future research.

A conceptual framework for managing post-disaster reconstruction projects in emerging economies: the case of Angola

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Nyamagere Gladys Sospeter ◽  
Pantaleo D. Rwelamila ◽  
Joaquim J. Gimbi
Keyword(s):  
Project Management ◽  
Conceptual Framework ◽  
Business Environment ◽  
Emerging Countries ◽  
Provincial Government ◽  
Future Research ◽  
Research Approach ◽  
Content Type ◽  
Essential Components ◽  
Post Disaster

PurposeThis study develops a conceptual framework appropriate for managing Post-Disaster Reconstruction Projects (PDRPs) so as to avoid cost and time overruns in Angola.Design/methodology/approachAn explanatory sequential mixed research approach was used. Data was collected from project participants within the ministry of planning, the provincial government office of planning and the local government in Angola. A questionnaire with closed questions was completed by 130 survey respondents. Semi-structured focus group interviews were conducted with seven participants selected through purposive sampling. Descriptive statistics, t-test and content analysis were used to analyse quantitative and qualitative data, respectively.FindingsThe study indicates that there is presently no formal project management process. Neither have government project management standards been developed and broadcast. This results in ad hoc processes being mostly used for managing PDRPs. The study further presents disaster preparation programme, community engagement, resources and stakeholder's engagement, post-disaster procurement policies, financial guides, post-disaster recovery legislation, context-specific (social economic, demographic, political and cultural variables), programme preparation as essential components to be considered for developing an appropriate framework for managing PDRPs.Research limitations/implicationsThe study is limited by its geographical settings which focussed the results on one province in Angola. However, the findings can be useful for other countries wishing to gain insights on the framework with “overlooked components” for managing DPRPs in emerging countries with similar disaster environment, government policies and same business environment.Practical implicationsThe framework for managing PDRPs may positively impact project realization, hence minimization of time and cost overruns. The findings are vital for managers, local practitioners and policy/decision-makers in emerging countries of essential components and lessons useful for managing PDRPs and making decisions when they intend to participate in such projects. An understanding of which approaches are critical and essential components of the framework serves as a basis for improving project delivery. Future research studies should describe its practical application.Originality/valueThe study provides insights by identifying an ordered grouped set of project management models/approaches mostly applicable for managing PDRPs in Angola, better understanding of appropriate components/variables to be considered and develops a conceptual framework for managing PDRPs in emerging countries, post-war context.

Investigating the adoption of social media in the construction industry: empirical evidence from project teams in China

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guofeng Ma ◽  
Shan Jiang ◽  
Jianyao Jia
Keyword(s):  
Social Media ◽  
Project Management ◽  
Environmental Factors ◽  
Construction Industry ◽  
Structural Equation ◽  
Project Teams ◽  
Equation Modeling ◽  
Future Research ◽  
Time Interval ◽  
Content Type

PurposeA lack of reliable and effective communication tools poses major barriers impeding the performance of construction projects consisting of diverse participants. Although some construction project teams (CPTs) begin to apply social media (SM) as an available approach for project management the entire mechanism of SM adoption in this specific context remains understudied. Therefore, this study aims to adopt a CPT's lens to investigate the critical antecedents and associated effects underlying SM adoption in the construction industry.Design/methodology/approachBased on the technology–organization–environment (TOE) theory, a conceptual model was proposed and tested by empirical data collected from 159 CPTs in China. Structural equation modeling technique was employed for data analysis.FindingsThe results demonstrate that all the five extracted TOE-based antecedents including two technological factors (i.e. compatibility and expected cost), one organizational factor (i.e. top management support) and two environmental factors (i.e. project partner collaboration and project fit) are crucial to the adoption of SM in CPTs. Besides, SM acceptance is found to mediate the relationships between organizational and environmental factors and SM use. Moreover, SM use significantly predicts the communication effectiveness of CPTs.Research limitations/implicationsA questionnaire study based on cross-sectional data from China may only unveil the logic of SM adoption in the context of Chinese construction industry within a shorter time interval. It is recommended that future research could develop longitudinal studies among various construction practitioners in different countries to further specify and generalize the current findings.Originality/valueThis paper provides a comprehensive understanding of SM adoption in the construction industry by exploring the preadoption antecedents and postadoption effects from the perspective of project teams. The empirical findings advance the current web-based project management literature and afford new insights for construction practitioners into better managing SM application to reap its full capabilities in projects.

Simulation of Large-Scale Magnetic Manipulation of Micro/Nano-Material Based on Monte Carlo Method

2020 ◽  
Author(s):  
Che-Fu Su ◽  
Xinrui Xiang ◽  
Jirui Wang ◽  
Edward Fratto ◽  
Majid Charmchi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Monte Carlo ◽  
Large Scale ◽  
Magnetic Alignment ◽  
Nano Materials ◽  
Magnetic Assembly ◽  
Nano Material ◽  
Magnetic Strength ◽  
Aggregate Structures ◽  
Monte Carlo Simulation Model

Abstract Magnetic assembly of micro/nano materials are of great interest due to their unique properties. These nano-scale materials can be ensemble with other matrixes to prepare for new functional micro/nano composites with enhanced specific properties such as, thermal conductivity. In this study, we demonstrated the distribution and magnetic alignment of nickel (Ni) nanoparticle/nanowires inside of a non-magnetic matrix, (e.g., water or a molten wax), experimentally and computationally. A two-dimensional Monte Carlo simulation model is employed to investigate the aggregate structures of Ni nanoparticle/nanowires subjected to a one-directional static magnetic field. It is anticipated that the applied magnetic strength will influence the attractive forces between nanoparticle/nanowires that will produce chain-like cluster structures parallel to magnetic direction where the aligned chains will be separated by a range of distances that are also function of magnetic field strength.

Research of the effect of changing the ratio of the content of steel and basalt-plastic reinforcement on the strength indicators of beams with hybrid reinforcement

2021 ◽  
Vol 2021 (23) ◽  
pp. 167-177
Author(s):  
Serhii Stoyanovich ◽  
Keyword(s):  
Strain State ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Stress Strain ◽  
Control Series ◽  
Metallic Composite ◽  
Stress Strain State ◽  
Stage Of Development ◽  
Hybrid Reinforcement ◽  
Composite Reinforcement

Introduction.The current stage of development of the construction industry is associated with the introduction of new materials into practice, compared with the «traditional» (steel, concrete, wood) have certain advantages in the form of improved strength, corrosion resistance, etc. These materials include non-metallic composite reinforcement.Problems Statement. The main disadvantage of non-metallic composite reinforcement (except for carbon fiber reinforcement) is significantly lower modulus of elasticity compared to metal reinforcement. This is the reason for the occurrence of excessive deformations in concrete structures, does not ensure the fulfillment of the requirements for the second group of limiting states. One of the ways to reduce the de-formations of concrete structures, without a significant increase in the percentage of reinforcement of the section, is the use of hybrid reinforcement, when reinforcement is performed simultaneously with metal and composite reinforcement. Currently, there is a very limited amount of experimental data on the stress-strain state of structures with such reinforcement.Purpose. Research of the stress-strain state of structures with hybrid reinforcement, establishing its effectiveness and the optimal ratio of the content of metal and composite reinforcement to achieve sat-isfactory strength and stiffness of a concrete structure.Materials and Methods. The work of beams under load, reinforced with basalt-plastic reinforce-ment, metal reinforcement (control series) and with hybrid reinforcement with metal and basalt-plastic re-inforcement simultaneously was researched. To find out the effect of changes in the content of basalt-plas-tic reinforcement in relation to metal on the performance of beams with hybrid reinforcement, various series of samples of beams with different ratios of basalt-plastic and metal reinforcement.Results. On the basis of the conducted studies, the nature of the work and destruction of concrete beams with hybrid reinforcement was assessed depending on the percentage of metal and basalt-plas-tic reinforcement. The strength indicators of concrete beams with hybrid reinforcement were obtained and analyzed. The test results showed that the strength of beams with hybrid reinforcement increased in comparison with beams of the control series and was at the level of beams reinforced with basalt-plastic reinforcement. At the same time, the deflections and crack width of the beams decreased.Conclusion. The use of hybrid reinforcement makes it possible to increase the bearing capacity of concrete beams, depending on the percentage of reinforcement in the section. The determining factors for the strength of beams with hybrid reinforcement are the strength of the concrete in the compressed zone and the percentage of section reinforcement. The optimal percentage of the ratio of metal and basalt reinforcement in concrete beams with hybrid reinforcement is 60 % / 40 %.Keywords:beams with hybrid reinforcement, basaltoplastic reinforcement, steel reinforcement, strength, deformability.

Sign in / Sign up

Export Citation Format

Share Document