H. Sharada Bai, Professor, Civil Engineering, UVCE, Bangalore University, Bangalore.
IntroductionIn most of the modern constructions of highrise buildings, bridges, flyovers, etc., fast track construction methodology is followed. The basic requirement of fast track construction is time, cost and quality. The construction management team has to adhere to the given time for completion of construction and see that the overall cost of construction does not exceed the estimated value. At the same time, it has to follow all quality assurance and quality system as per requirement in the specification. If these targets are not reached, heavy penalty will be levied on the concerned parties. Hence, all efforts will be made to see that the project is completed on time, minimize the excess cost and satisfy QA/QC systems to the best possible extent.
In the race to satisfy all the above requirement in fast track construction many mistakes / errors / blunders will be committed by all the parties knowingly or unknowingly, which will be overlooked until the deficiencies are expressed by the structural members of the building in one way or the other. To make up these identified deficiencies considerable amount of time will be elapsed and money will be spent, which will definitely overshoot the estimated cost, time and quality.
In the present paper one such example of a large multistoreyed building under construction, which was following fast track construction methodologies had to be investigated for the deficiencies observed and later on rectify the problems, thus, overshooting the target time and money.
Case StudyA software multistoreyed building for a German company comprising basement, ground plus five upper floors of total builtup area 32,500 sq.mt. (3,50,000 sq.ft.) was under construction. Time for completion of the building in all respect was given as 12 months. The columns and footings are of RCC with flat slab construction.
Different grades of concrete were used for different levels, columns upto second floor were of grade M40 and upper floors M35. All other structural members were of grade M25.