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3 4 不同抗震等级框架的抗震计算3 4 1 一级框架（1）强柱弱梁 梁柱节点处除框架顶层和柱轴压比小于0 15者外，柱端组合的弯矩设计值应符合下式要求：ΣＭｃ =1 4ΣＭｂ （6 ） 9度和一级框架结构，尚应符合：ΣＭｃ =1 2ΣＭｂｕａ （7）式中 ΣＭｃ———节点上下
3 4 Seismic Calculation of Different Seismic Rating Frames 3 4 1 Primary Frames (1) Beam-to-column joints of strong column and weak beam shall have the design values of bending moment of column-end combination except the top-layer and column- The following requirements: ΣMc = 1 4ΣMb (6) 9 degrees and a framework structure, should still meet: ΣMc = 1 2 Σ Mbua (7) where ΣMc --- node up and down