A 6 storey with roof deck building has a total height of 21m. The computed base shear is 900 kN. Each floor has an average height of 3.5m. Each floor has a weight of 3500 kN except for the top most level with a weight of 2500 kN. Its natural period of oscillation is 0.75 sec. What is the shear at the 2nd level, 3rd level, 4th level and 5th level?

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Load and resistance factor design

Load and resistance factors design (LRFD), also known as Limit state design (LSD), refers to the design method used in building engineering. A boundary condition is a condition of a structure where it can no longer meet the relevant design requirements. The condition may refer to the load level or other actions on the structure, while the terms refer to the integrity of the structure, suitability for use, durability, or other design requirements. A structure designed for LRFD is limited to keeping track of all possible actions during its design time and is always ready for use, with the appropriate level of reliability in each boundary condition. LRFD-based construction codes clearly define the appropriate levels of reliability in their instructions.