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=0Support 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