静定平面桁架的内力计算习题课2一、找出桁架的零杆(1)FP8根零杆FP00000000一、找出桁架的零杆(2)5根零杆FP00000FP(3)FPFP12根零杆FPFP0000000000012根零杆(4)FPA000000000000FPA(5)aaaaFPFPABCD6根零杆aaFPFPaaFP2FPFPFN1ABCD000000由于荷载反对称,该桁架除下部水平链杆AB外,其余杆件受力反对称,故。FNCD=0(6)FP6根零杆FP000000附属部分7根零杆(7)FP0000000FP二、用简捷方法求桁架指定杆轴力(1)FPFPFPaa/2aa/2ABCDEFGHa/2a/2...