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= π²EI /(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) ●一1 -- 一一一> -7s0- 一一1 ●-一
Support Footprint Method-Force flow Example(vertical loads)
Support Footprint Method Example (Horizontal loads) 1212 12 12 风荷Fw M=Fwh 7777777777777777777777777777777 C C2 C3 Cs 2×(3C5×24+3C4×12)=M 12 144C5+36C5=Fwh C5=Fwh/180 2 C4=Fwh/360 C1=-Fwh/180 16↓12124126 C2=-Fh/360 C
Support Footprint Method Example (Horizontal loads) 风荷 h 12 12 12 12 C1 C2 C3 C4 C5 M M Fwh 6 12 12 12 6 C5 C4 C2 C1 2 (3C5 24 3C4 12) M 144C5 36C5 Fwh C5 /180 C4 360 C1 180 C2 360 Fw Fwh Fwh Fwh Fwh / / / 12 12
Support Footprint Method Fig.2.5 vertical and horizontal loads together B W H H M ⌒ a a ⌒ -H -H -W -W 平衡条件： W十（一）=0 M-Ha M=Ha=We H十(-H西=0 W+(-0=0 H十（一(HD=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 e
Support Footprint Method Fig. 2.6 Asymmetry building under vertical load