结构力学(第4版)教学课件6-3完整

第6章位移法§6-9无剪力分配法由剪力静定杆件与无侧移杆件组成的有侧移刚架可用无剪力力矩分配法计算内力。计算过程与力矩分配法类似。BEICqEIl剪力静定杆ABABCl1/43/4CSBAiSBC3i-1/601/8CBA0.25BC0.751/243/24-1/81/8MABFql2/3ABM(×ql2)F2-1/3MBAql/6-1/24A-3/83/8第6章位移法例6-21计算图示结构，作弯矩图1/4DBDE3/4FPl/2FPDEFP-0.50-0.30.20.6FBCF-0.60.6PPFPllEI=常数BDBABCA1/51/53/5lFPl-0.5-10SBAiSBC3iSBDi0.30.30.91/53/51/5-0.20.040.040.120.6BABCBD0.6SDBiSDE3i-0.36-0.661.02ABDB1/4DE3/4-1-0.3-0.04-1.341.340.360.66FF1.02MBAFPlMABFPlMBDFFPl/2MDBFFPl/2M图(FPl)第6章位移法例6-22计算图示结构，作弯矩图。FP/3FP/2FP/6FPEI=常数lFP/3FP/2FP/6F/3lFP/2llF/60PPFP/3FP/3FP/2FP/2FP/6FP/6FP/3FP/2FP/6第6章位移法F/2FP/6SAE6iSABiFP/3PFPl/121/7AAE6/7ABBCD0BA1/8BF3/4BC1/8EFGHFPl/61/83/41/8CBCGCDDC1/7DH6/7AEAB6/7BABFBCCBCGCDDCDF1/71/83/41/88331/83/41/81/76/7-1667-16678338338331429238-238208-208-1250-208208-1089315108648108-108149-149-892-155-5-31-5-15-11811-1-410-18116561155000896-8961523-1523511-1281770第6章位移法FP15236565111281896ABCDEFG图(×FPl/10000)AEAB6/7BABFBCCBCGCDDCDF1/71/83/41/88331/83/41/81/76/7-1667-16678338338331429238-238208-208-1250-208208-1089315108648108-108149-149-892-155-5-31-5-15-11811-1-410-18116561155000896-8961523-1523511-1281770第6章位移法例6-24计算图示结构，作弯矩图。EI1=∞EI1=∞4Pl/1742Pl/17Pl/17PCPl/17ABlEIEI2Pl/17EIB2Pl/17DE4Pl/174Pl/17Pl/17FM图4Pl/17解：DD12i/l2F8P12QAD练习：作弯矩图33i178D312EI/(2l)2EI1=∞Pl/4EI1=∞Pl/82lFQBEPFQCF1PPD18171EI2EIEIlD17811723Pl/8Pl/4Pl/81717第6章位移法EA=∞EA=∞EA=∞EA=∞EA=∞EA=∞F+FqEIEIEI=qEIEIEIEIEIEI例6-26计算图示结构，作弯矩图。EA=∞3ql/83q