1.單跨靜定梁的反力The reactions of single span beams
常見單跨梁 The most common single span beams ：
單跨梁都是由粱和地基按兩剛片規(guī)則組成的靜定結(jié)構(gòu)，因而其支座反力都只有三個，可取全梁為隔離體，由平面一般力系的三個平衡方程求出。
Single span beam is a statically determinate structure composed of beam and foundation according to 2-body rule, there are 3 reaction forces which can be determined by isolating free body and solving the equilibrium equation of forces.
2、內(nèi)力Internal forces
符 號 規(guī) 定 Sign conventions
軸力axial force FN –tensile as positive拉力為正
剪力shear force FS— clockwise as positive 繞隔離體順時針方向轉(zhuǎn)動者為正
彎矩bending moment M—causing tension in the lower fibers-positive 使梁的下側(cè)纖維受拉者為正
