动手作业小结： 1.大原则：强度破坏>失稳破坏 2.抗整体失稳：I越大越好！ 欧拉公式P=π2EI/KL)2 Footprint优化！ 3抗局部失稳：约束局部，重视细节！
动手作业小结: 1.大原则: 强度破坏>失稳破坏 2.抗整体失稳: I 越大越好! 欧拉公式 P= π² EI /(K L )² Footprint 优化！ 3.抗局部失稳:约束局部,重视细节！
Support Footprint Method-Force flow Example(vertical loads)
Support Footprint Method-Force flow Example(vertical loads)
Support Footprint Method Example (Horizontal loads) 12 12 12 12 风荷F M=Fwh h ⊕ 77777777777777777777777777777777 C2 C3 C 2×(3C5×24+3C4×12)=M 12 144C5+36C5=Fwh C3=Fwh/180 C4=Fwh/360 C1=-Fwh/180 L6↓12412_41246 C2=-Fwh/360
Support Footprint Method Example (Horizontal loads) 风荷 h 12 12 12 12 C C 1 2 C3 C4 C5 M M Fw h 6 12 12 12 6 C5 C4 C2 C1 2 (3 C5 24 3 12 C4 ) M 144 C5 36 C5 Fw h C5 /180 C4 360 C1 180 C2 360 Fw Fw h Fw h Fw h Fw h / / / 12 12
Support Footprint Method Fig.2.5 vertical and horizontal loads together B W H H M M a -H -H -W -W 平衡条件： W十（一0=0 M=Ha M-Ha-We H十（一⑩=0 W十(-W=0 H十（一(H=0
Support Footprint Method Fig. 2.5 vertical and horizontal loads together B W W H a H M M H a H W W e 平衡条件： W＋( －W) ＝0 M=Ha M=Ha=We H ＋( －H) ＝0 W＋( －W) ＝ 0 H ＋( －(H)=0
Support Footprint Method Fig.2.6 Asymmetry building under vertical load M W 。 W ]
Support Footprint Method Fig. 2.6 Asymmetry building under vertical load