Yükleniyor…
Yükleniyor…
With the increasing pressure for competitiveness on construction contractors, it is necessary to capture, transfer and reuse project knowledge and use lessons learned from previous projects to improve project performance. Knowledge is increasingly seen as a key but often underutilized asset. While Knowledge Management (KM) tends to focus on aspects of the capture, storing and retrieval of knowledge, knowledge creation, dissemination and application is also vital. Thus there is value in managing organizational knowledge. This knowledge originates from the experiences of organizations and is retained in the form of corporate memory. This retained knowledge is usable in expediting similar work in the future, thus benefiting the organization by assisting in rapid implementation on projects. The main objective of this thesis is to investigate the challenges of knowledge management (KM) and introduce a Model of Framework for Lessons Learned Process (LLP) that facilitates the sharing of knowledge about experiences and transferring of lessons learned at organizational level in North Cyprus construction industry. The research focus is to identify the processes of knowledge management, analyze the use of project feedback and lessons learned, and introduce a Model of Framework for LLP in construction contractors. A questionnaire survey, which was administered to the construction contractors in the industry, has been used in conducting the survey. The research includes an extensive literature study, interviews with managers on how to manage lessons learned processes throughout the organizations, analysis of this information to develop findings, and extending these to model an evolving framework of LLP over time in organizations. Without managing lessons learned process, the proper culture, and efficient technology application, the value of the knowledge, even if it is present, will be significantly less.
Deterioration due to corrosion becomes a more serious problem when the exact time of expected earthquakes is unknown. Therefore, the prediction of performance levels of corroded reinforced concrete (RC) structures is important to prevent serious premature damage. Many models have been developed regarding the effects of corrosion as a function of time. It is possible to evaluate and identify the performance level of RC structures as immediate occupancy (IO), life safety (LS), collapse prevention (CP), and collapse (C). The first part of this study contributes to an understanding of time dependent effects of corrosion on seismic performance levels of corroded RC buildings that will be a guideline for the further studies for strengthening and assessing of RC buildings. The developed model in the first part of this thesis provide to predict the time dependent seismic performance levels of RC buildings by considering three major effects of corrosion (e.g., deformation due to bond-slip relationships, loss of cross sectional area of reinforcement bars and reduction in concrete compressive strength). In second part of this thesis, the effect of corrosion on the bond strength between reinforcement bars and concrete was studied in a series of experiments. An accelerated corrosion method was used to corrode the reinforcement bars embedded in concrete specimens. Pullout tests were performed to develop an empirical model for the ultimate bond strength by evaluating bond strengths in two different concrete mixes, three concrete cover depths and different mass losses of reinforcement bars after corrosion. Bond-slip relationships for the different corrosion levels were compared for different concrete classes and concrete cover depths.