Example 11 (TBEC 2018 section Z-l-2.1.): Reinforced concrete building with 6 floors and 1 basement will be constructed on a soil deposit with shear strength parameters of c, = 250 kPa and $µ = 0°. Unit weight of the soil is given as 19 kN/m³. Depth of the foundation is 3.5 m and dimensions of the raft foundation is 14m x 19m. Under the static condition and with 1.4DL+1.6LL load combination, maximum foundation pressure is determined as 364 kPa whereas, in earthquake condition with 1DL+1LL+1E, maximum foundation pressure is given as 216 kPa. Calculate the ultimate bearing capacity by using General Bearing Capacity equations and determine whether the foundation is safe or not.

Example 11 (TBEC 2018 section Z-l-2.1.): Reinforced concrete building with 6 floors and 1 basement will be constructed on a soil deposit with shear strength parameters of c, = 250 kPa and $µ = 0°. Unit weight of the soil is given as 19 kN/m³. Depth of the foundation is 3.5 m and dimensions of the raft foundation is 14m x 19m. Under the static condition and with 1.4DL+1.6LL load combination, maximum foundation pressure is determined as 364 kPa whereas, in earthquake condition with 1DL+1LL+1E, maximum foundation pressure is given as 216 kPa. Calculate the ultimate bearing capacity by using General Bearing Capacity equations and determine whether the foundation is safe or not.

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter8: Mat Foundations

Section: Chapter Questions

Problem 8.1P

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Concept explainers

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.

Question

Example 11 (TBEC 2018 section Z-I-2.1.): Reinforced concrete building with 6 floors and 1 basement
will be constructed on a soil deposit with shear strength parameters of c, = 250 kPa and ou = 0°.
Unit weight of the soil is given as 19 kN/m³. Depth of the foundation is 3.5 m and dimensions of the
raft foundation is 14m x 19m. Under the static condition and with 1.4DL+1.6LL load combination,
maximum foundation pressure is determined as 364 kPa whereas, in earthquake condition with
1DL+1LL+1E, maximum foundation pressure is given as 216 kPa.
Calculate the ultimate bearing capacity by using General Bearing Capacity equations and determine
whether the foundation is safe or not.

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