Q1: The live load to be considered for an accessible roof, is

ANS:C - 150 kg/m²

For an accessible roof, the live load to be considered typically depends on the intended use of the roof space and relevant building codes or standards. Here are some common live load values for accessible roofs:

1. Nil: If the roof is not intended for human occupancy or activity, such as a sloped or flat roof used solely for weather protection and not accessed by people, the live load may be considered as nil.
2. 75 kg/m²: This value might be applicable for a roof intended for occasional maintenance activities, such as routine inspection or repair, where light loads may be encountered. However, this value can vary based on specific building codes or standards.
3. 150 kg/m²: For roofs intended for regular human occupancy, such as rooftop terraces or accessible green roofs, a live load of 150 kg/m² is often considered. This accounts for the weight of people, furniture, and other objects that may be present on the roof.
4. 200 kg/m²: In some cases where heavier loads are expected, such as rooftop gardens with dense vegetation or areas where equipment or machinery may be installed, a live load of 200 kg/m² or higher may be specified.

It's important to consult local building codes, regulations, or standards to determine the appropriate live load requirements for an accessible roof in a specific jurisdiction. Additionally, the structural engineer responsible for the design should consider factors such as the roof's intended use, occupant density, and potential loads to ensure the roof's structural adequacy and safety.