A simple support beam with a span of lo=4m, the standard value of linear uniformly distributed permanent load on the is qGk=8kN/m, and the standard value of the variable uniformly distributed load is qqk=6kN/m, the standard value of the concentrated variable load in midspan is P₁=10kN, no wind load to participate in the combination. The beam is an important building component with a safety level of one grade and a design life of 50 years. Calculate the design value of bending moment in midspan!

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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.