Productivity in the use of resources required for civil engineering construction to erect necessary infrastructure is vital for economic progress, because the construction sector is an important component of economic activity in the country. Because productivity has to be measured before it can be improved, a seven-tier hierarchy of construction activities is proposed. Productivity can and should be measured, monitored and improved on each of the seven levels.
This paper analyses experimental work on partially prestressed members previously reported in the literature, in the light of various existing design models for deflection and cracking. Using the available data in a parametric study, the most suitable design approaches are identified. In some instances improved formulations are derived. In addition, recommendations are made for further experimental work that is required to confirm the long-term deflection and cracking behaviour of partially prestressed members.