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等截面超静定杆的杆端弯矩和剪力弯矩剪力编号梁的简图MABMBAFQABFQBA1ilEI44=ilEI22=lilEI662−=−lilEI662−=−2lilEI662−=−lilEI662−=−231212lilEI=231212lilEI=322labFP−8lFP−（当a=b=2l）22lbaFP8lFP32)2(lalbFP+2PF32)2(lblaFP+−2PF−42121ql−2121qlql21ql21−52201ql−2301qlql207ql203−6Mllab2)3(−Mllba2)3(−Mlab36−Mlab36−7ilEI33=0lilEI332−=−lilEI332−=−8lilEI332−=−02333lilEI=2333lilEI=922)(lblabFP+−lFP163−（当a=b=2l）03222)3(lblbFP−PF1611322)2(lblaFP+−PF165−10281ql−0ql85ql83−112151ql−0ql104ql101−1221207ql−0ql409ql4011−13Mlbl22223−8M（a=b=2l）0（al）Mlbl3222)(3−−Ml89−Mlbl3222)(3−−Ml89−14ilEI=ilEI−=−0015lblaFP2)(+−83lFP−（当a=b=2l）laFP22−8lFP−PFPF016231ql−261ql−ql017281ql−2241ql−ql210182245ql−281ql−ql21019lbM−2M−（当a=b=2l）laM−2M−00