以下是某次分析的求解结果。

RESPONSE LOAD CASE16

     CQCMODAL COMBINATION METHOD USED.
     DYNAMIC WEIGHT X Y Z3.409641E+054.051591E+013.401698E+05 KN
     MISSING WEIGHT X Y Z-1.592456E+05 -4.051590E+01 -3.125289E+05 KN
       MODAL WEIGHT X Y Z1.817185E+051.713038E-062.764090E+04 KN
      STAAD SPACE-- PAGE NO.213
        

           MODEACCELERATION-GDAMPING
           -------------------------

              10.077910.02000
              20.082860.02000
              30.083070.02000
              40.083300.02000
              50.091780.02000
              60.108880.02000

PARTICIPATION FACTORS

           MASSPARTICIPATION FACTORS IN PERCENTBASE SHEAR IN KN
           --------------------------------------------------------

MODEXYZSUMM-XSUMM-YSUMM-ZXYZ

   152.590.000.1052.5940.0000.09913971.360.000.00
   20.480.000.0253.0700.0000.119134.490.000.00
   30.200.000.0153.2700.0000.12956.750.000.00
   40.010.000.0053.2770.0000.1292.030.000.00
   50.010.001.3853.2850.0001.5122.350.000.00
   60.010.006.6153.2950.0008.1263.910.000.00
                                                    ---------------------------
                                  TOTAL SRSSSHEAR13972.120.000.00
                                  TOTAL 10PCT SHEAR14164.620.000.00
                                  TOTAL ABSSHEAR14170.880.000.00
                                  TOTAL CQCSHEAR14008.580.000.00

RESPONSE LOAD CASE17

     CQCMODAL COMBINATION METHOD USED.
     DYNAMIC WEIGHT X Y Z3.409641E+054.051591E+013.401698E+05 KN
     MISSING WEIGHT X Y Z-1.592456E+05 -4.051590E+01 -3.125289E+05 KN
       MODAL WEIGHT X Y Z1.817185E+051.713038E-062.764090E+04 KN

           MODEACCELERATION-GDAMPING
           -------------------------

              10.077910.02000
              20.082860.02000
              30.083070.02000
              40.083300.02000
              50.091780.02000
              60.108880.02000
      STAAD SPACE-- PAGE NO.214
        

PARTICIPATION FACTORS

           MASSPARTICIPATION FACTORS IN PERCENTBASE SHEAR IN KN
           --------------------------------------------------------

MODEXYZSUMM-XSUMM-YSUMM-ZXYZ

   152.590.000.1052.5940.0000.0990.000.0026.11
   20.480.000.0253.0700.0000.1190.000.005.85
   30.200.000.0153.2700.0000.1290.000.002.66
   40.010.000.0053.2770.0000.1290.000.000.13
   50.010.001.3853.2850.0001.5120.000.00431.75
   60.010.006.6153.2950.0008.1260.000.002449.57
                                                    ---------------------------
                                  TOTAL SRSSSHEAR0.000.002487.48
                                  TOTAL 10PCT SHEAR0.000.002881.53
                                  TOTAL ABSSHEAR0.000.002916.06
                                  TOTAL CQCSHEAR0.000.002558.95
___________________________________________________________

结果中x和z向的参与系数相差很大，z向的质量参与系数很小，为何？？
如何从以上结果中判定振型的扭转成分等信息？
能否讲解一下和sap2000的求解及输出的异同。

sap怎么算的俺不知道，其余的在这里：
http://www.reichina.com/bbs/dispbbs.asp?boardID=2&ID=886