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美国钢结构研究所(简称AISC)的荷载和阻力系数设计规范(简称LRFD)中,对高层设计中考虑结构倾斜对P-Δ效应的影响,而对杆件的抗弯强度M_u进行放大,其公式为
In the Design Specification for Load and Resistance Coefficients (referred to as AISC) of the American Institute of Steel Structure (abbreviated as LRFD), the influence of structural tilt on the P-Δ effect is considered in high-rise designs, and the bending strength M_u of the member is amplified. The formula is