American Research Journal of Civil and Structural Engineering

Johnson Kampamba1 , Simon Kachepa2 , Milidzani Majingo3 and Kathata Pearl Babitseng4

Purpose: To assess the practice of property maintenance in high rise properties in the Gaborone central business district (CBD). The objectives of this study were to; identify the maintenance practices adopted in high rise building in the CBD area, assess the challenges faced by maintenance personnel in carrying out maintenance works and find out the most preferred maintenance practices in high rise buildings. Methodology: Both primary and secondary sources of data were used. Primary data was collected through the use of questionnaires which were administered to five facility managers of high rise buildings (Masa centre, iTowers, Zambezi Tower, Square Tower, and Prime Plaza) and 100 occupants of the buildings. Secondary data was collected from journal articles, published books, conference papers, periodicals and dissertations. Microsoft Excel was used to analyse and present the data. Findings: Based on literature reviewed, it was revealed that property maintenance is very important in high rise properties and that there are two types of maintenance which are; planned and unplanned maintenance or predictive and emergency maintenance. It was also found out that planned preventative maintenance is the most preferred maintenance activity. Maintenance personnel are often faced with institutional, financial, personnel and equipment and construction and user challenges. Research limitations/implications: The implication for this study is that if proper maintenance activities are not implemented by maintenance personnel, building occupants will not be satisfied with their occupancy in the building and its life span will ultimately reduce. Recommendations: Training maintenance personnel should be done in order to ensure that professionals are up-to-date with new technical methods of carrying out maintenance activities effectively. Property owners should be actively involved in construction of high rise buildings so that important information can be documented to eliminate the issue of facilities managers managing properties which they do not have full details about. Value of the Study: This study has provided a context in which maintenance procedures in high rise buildings can be effectively carried out to improve overall building rating and performance.

Hamid Jafari Nia1 , Hamideza Babaali1 , Kaveh Ostad-Ali-Askari*2

Nowadays, the problem of scheduling and executing projects with the least cost and time has become one of the main concerns of project managers. In this regard, researchers have used different methods and patterns. One of these methods is to use concurrent engineering in projects. Simultaneous engineering means the creation of a project schedule for projects based on existing units and human resources so that a synchronous rule can be applied to the project so that the project can be completed in less time. Modeling time and cost in large-scale construction projects is actually complicated and complicated. These complexities actually increase the risk of time and cost in the project. In this research, a new method called Chouquet integral algorithm is used to analyze time and cost equations. The chouquet integral is a method used to analyze and linearize complex equations. The proposed method is implemented on an executable model in 2017 and analyzed and analyzed in MATLAB software. The results show that the error rate of time and cost in the construction model resulted in a reduction of 27% and 14%, respectively.