الفهرس 
CHAPTER (1) (INTRODUCTION)Only 14 pages are availabe for public view
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Abstract
In our present time, precast pre-stressed concrete is playing an important role and being constructed worldwide for a variety of functions in environmental conditions, in the upcoming buildings, malls, convention centers, hospitals, bridges, underground works, railway stations, industrial buildings, and skyscrapers, etc.
Precast pre-stressed beams system in bridge projects differ from conventional structural engineering projects mainly in the special problems that have to be considered during construction, transportation, erection, installation, and operation.
The crew productivity improvements in bridges are attributed to the technological advances in equipment and construction methods over the last two decades. Many factors impact the crew productivity has a system in bridges.
For every projects, productivity, time, cost, and quality have been the main concern. The purpose of the study discussed in this thesis is improving the crew productivity and projects’ performance for the construction of precast pre-stressed beams in bridges.
The research was conducted by making personal interviews, copy of literature review, researchers’ knowledge, telephone calls and correspondence via an email. After we collecting 95 factors in a questionnaire we designing a model on Excel to calculate the important index , frequency index , Servite index and the variance for measuring and evaluating crew factors productivity for construction process of precast pre-stressed in bridges based also on several main factors that affect the precast, After that we designing s model on MATLAB, measuring and evaluating the crew productivity of construction of pre-stressed in bridges for based on the several factors Collecting and the calculation on the Excel model process to conclude in model with the recommendation for improving the crew productivity in bridge .
The construction industry can use the findings in this thesis as a basis for improving the crew productivity and projects’ performance for the construction of pre-stressed in bridges projects