Uniformly distributed live load requirement for ‘Offices for general use’  

This question was received from Krishmal Dutt <krishmal.dutt@erasito.com> based in Fiji:

“We are currently conducting an assessment of an existing reinforced concrete floor slab. The floor slab is suspended and was designed to sustain a live load of 3kPa which corresponds to the minimum uniformly distributed live load requirement for ‘Offices for general use’ in accordance with AS/NZS 1170.1: 2002.  We wish to determine the actual live load on the existing office floor slab by assessing the current usage of the floor (i.e. weight, type, number and layout of furniture, desks, drawers, etc.) to confirm if the 3kPa loading has been exceeded or not.  In order to complete our exercise with confidence, we would like to have an understanding of how the minimum uniformly distributed live load requirement of 3kPa was derived.  In addition, are there any specific restrictions to the mass, number, size, location, arrangement, type of items that contribute to this live load requirement?  Any form of assistance/guidance is highly appreciated.”