Sharif Digital Repository

Workers' absence considerably a ects the performance of labor-intensive construction projects. Identifying such absence patterns assists construction project managers in preparing proper project organization, reducing the absence rate, and improving the project performance. Despite its critical role, no study has investigated the absence pattern in the construction industry in Iran. This study addresses this gap by identifying the worker's absence pattern and providing recommendations to reduce the absence rate. First, a comprehensive literature review is conducted on the impacts of in uential factors in the worker's absence. Then, a questionnaire-based survey is designed and distributed... 

Despite the seismic vulnerability of non-structural Exterior Infill Walls (EIWs), their resilient design has received minimal attention. This study addresses the issue by proposing a novel framework for predicting possible damage states of EIWs. The framework benefits from an automated combination of Building Information Modeling as a visualized 3D database of the building's components and the Machine Learning classification as the prediction engine. The framework's applicability is studied in a Proof of Concept example of the exterior walls of the buildings damaged in the 2017 earthquake in Kermanshah, Iran. The Extremely Randomized Trees classifier produced the best results for predicting... 

The utilization of tower cranes at construction sites entails inherent risks, notably the potential for loads to fall. This study proposes a novel method for identifying the tower crane load fall zone and determining workers’ locations relative to this zone. Previous studies have failed to accurately identify the load fall zone, mainly due to the difficulties in detecting various types of crane loads. This study presents a method that uses computer vision algorithms to detect crane loads based on their movement patterns and elevation, while also employing the YOLOv7 deep learning algorithm to detect workers and using stereo camera depth data to measure their positions in the 3D world... 

Safety has been one of the main concerns in the construction industry in recent years. Construction fatalities, injuries, and accidents impose unrecoverable losses and enormous costs every year. Despite all advancements in new methods, tools, equipment, and regulations, the rate of accidents, especially in fatal four, has not considerably improved. This fact has motivated safety professionals and researchers to explore further innovative ways to remedy the problem. One of the outcomes of safety studies is training. Continuous yet effective training can present essential safety knowledge to new employees and refresh the comprehension of current employees. However, such training sessions... 

Urban area regeneration is a matter of every municipality over time. Regeneration projects are usually cost-intensive and directly affect many vulnerable members of society. Public-private-people partnership (PPPP) is one of the adopted methods by various municipalities in these projects. Multiple players with different backgrounds and uncertainties involved complicate the development process of PPPP projects. A carefully designed framework is required to successfully deliver these projects. This research develops a holistic PPPP framework for the old urban neighborhood regeneration projects in Iran. The collective experience of urban area regeneration projects from the literature and field... 

The use of smart and complicated technologies in manufacturing industries has brought new issues to the maintenance systems in recent years. In this research, an intensive literature review is performed to identify and classify these issues. Inspired by the recent advances that Building Information Modeling (BIM) has brought to the construction industry, the research proposes adopting BIM in manufacturing maintenance systems to address the existing issues. A list of BIM capabilities utilized for addressing maintenance issues of buildings is extracted from the literature. It is argued that these BIM capabilities can also solve similar maintenance issues found in manufacturing industries. A...