题一（２５分） 如图所示，狭长矩形截面直杆单侧作用有轴向均布剪切载荷，其单位长度上的大小为ｑ． １．（５分）任意截面上的轴力Ｎ（ｘ）＝ 与弯矩Ｍ（ｘ）＝ ２．（５分）如果平面假设与胡克定律成立，任意横截面上正应力 ３．（５分）ｑ、Ｎ与Ｍ之间的平衡微分关系为 ４ Problem 1 (25 points) As shown in the figure, the uniaxial axial shear load acts on one side of a straight bar with a narrow, rectangular cross section and the unit length is q. 1. (5 points) Axial force N (x) = moment M (x) = 2 at any cross section. (5 points) Normal stress on any cross section if plane assumption and Hooke’s law are established. (5 points) q, the equilibrium differential between N and M is 4