9d= Aog =LApDos 2.内力,应力 取上半部研究 D 2N Jo qd do. SIn p =qdD D 1 Do Apd o=Apv O (t<D认为均布)2．内力，应力 取上半部研究 2 2 1 qd = Aan = AD d q D D N q d d d =  =      0 sin 2 2 2 2 2 4 1 2 A d A v q D N d d = =   =  ) 2 ( D v = 2 v A Nd  d = =  (t<<D认为均布)