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Articles by A.A.A. Ali
Total Records ( 2 ) for A.A.A. Ali
  M. R. Abdul Kadir , W.P. Lee , M. S. Jaafar , S. M. Sapuan and A.A.A. Ali
  The Industrialised Building System (IBS) was introduced in Malaysia in 1966, but it failed to establish itself on a continuous basis though there is a sustained large market for residential projects even since. One of the reasons behind this shortcoming is the lack of scientific data on labour productivity that could convince policy maker. Hence, the objective of this study is develop a standardised data collection methodology for measuring and comparing the conventional building system and IBS in term of labour productivity, crew size and cycle time. Labour productivity (manhours/m2) is defined as the manhours required to complete the structural element of one unit house. A total of 499 data points were obtained from seven residential projects constructed between January 2003 and April 2004. Analysis of Variance (ANOVA) indicated that the labour productivity was significantly different between four structural building systems. The mean labour productivity for conventional building system was 4.20 manhours/m2 followed by cast in-situ table form (2.70 manhours/m2), cast in-situ half tunnel form (1.88 manhours/m2) and precast concrete system (1.33 manhours/m2). Further, the analysis of crew size indicated that the mean crew size for conventional building system of 24 workers was significantly different from the IBS of 22 workers. However, the crew size within the IBS was found to be insignificant. The cycle time measured in days per house was found to be significantly different between structural building systems with the conventional building system of 4.9 days, cast in-situ table form of 3.9 days, cast in-situ half tunnel form of 2.9 days and precast concrete system of 2.3 days. The labour productivity obtained from this study could be used as a preliminary guideline for client or consultant to identify the most appropriate building system for executing a construction project and determining the labour requirement in the construction industry.
  Algorafi M.A. , A.A.A. Ali , M.S. Jaafar , I. Othman , M.P. Anwar and R. Rashid
  Externally Prestressed Segmental (EPS) concrete box sections are widely used in the construction of bridge structures today. EPS concept has become an attractive tool for rehabilitation and strengthening of existing bridges which have insufficient strength and/or excessive deflection and cracking. Problem statement: EPS bridges are affected by combined stresses (bending, shear, normal, and torsional) at the joint interface between the segments. However, very limited researchers studied this type of bridges under combined stresses. Approach: This paper presented an experimental investigation of the structural behaviour of EPS bridge with shear key under torsion. Four beams were tested, each containing three segments that were presetressed using two external tendons. A parametric study of two different external tendon layouts as well as different levels of torsional force applied by different load eccentricities was conducted. Results: The effect of torsion was evaluated in terms of vertical deflections, concrete and tendon strains, failure loads and failure mechanisms. It was concluded that torsion has a significant effect in the structural behaviour of external prestressed segmental box girder beams. Torsion not only alters failure load of the beam but also changes the type of failure mechanism. It was also investigated that harp tendon layout results in better structural behaviour in term of deflection and tendon strain as compared with the straight tendon. Recommendations: It recommended including the effect of joint (flat and shear key) type as well as the effect of tendon layout under torsion to obtain comprehensive behavior of EPS bridge.
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