顶部立杆段:λ=l0/i=kμ1(hd+2a1)/i=1×2.2×(700+2×200)/15.9=152.201≤[λ]=210满足要求! 非顶部立杆段:λ=l0/i=kμ2h0/i=1×1.8×1200/15.9=135.849≤[λ]=210满足要求!3、立杆稳定性验算 顶部立杆段:λ=l0/i=kμ1(hd+2a1)/