【求助】求教前辈，关于嵌固端选择和地库建模的问题

一个区的一层地下车库，地上两栋楼，一栋12层框剪，一栋八层框架。地库顶板至室外地坪距离1m。现在有俩疑问，一是建模计算，我现在是建3个模型，一个12框剪带3跨地下，一个8层框架带3层地下，一个删掉上层的纯地库，地库的配筋按3个包络，不知道对不对？
二是地上的楼嵌固端选在顶板还是底板好，下面是12层的计算信息（带3跨）。
Floor No. 1 Tower No. 1
Xstif= 29.1147(m) Ystif= 100.2777(m) Alf = -5.0340(Degree)
Xmass= 28.6158(m) Ymass= 81.7490(m) Gmass(活荷折减)= 12054.3008( 10586.7939)(t)
Eex = 0.0148 Eey = 0.6664
Ratx = 1.0000 Raty = 1.0000
Ratx1= 6.8516 Raty1= 37.2145
Ratx2= 4.5912 Raty2= 24.9369 薄弱层地震剪力放大系数= 1.00
RJX1 = 7.3843E+07(kN/m) RJY1 = 1.2472E+08(kN/m) RJZ1 = 0.0000E+00(kN/m)
RJX3 = 2.2035E+07(kN/m) RJY3 = 6.7231E+07(kN/m) RJZ3 = 0.0000E+00(kN/m)
RJX3*H = 1.2339E+08(kN) RJY3*H = 3.7649E+08(kN) RJZ3*H = 0.0000E+00(kN)
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Floor No. 2 Tower No. 1
Xstif= 27.4848(m) Ystif= 87.2891(m) Alf = 0.0000(Degree)
Xmass= 27.2146(m) Ymass= 84.7840(m) Gmass(活荷折减)= 1561.5449( 1439.0548)(t)
Eex = 0.0246 Eey = 0.1286
Ratx = 0.6137 Raty = 0.2412
Ratx1= 2.2356 Raty1= 2.2225
Ratx2= 1.7388 Raty2= 1.7339 薄弱层地震剪力放大系数= 1.00
RJX1 = 4.5318E+07(kN/m) RJY1 = 3.0086E+07(kN/m) RJZ1 = 0.0000E+00(kN/m)
RJX3 = 4.5943E+06(kN/m) RJY3 = 2.5808E+06(kN/m) RJZ3 = 0.0000E+00(kN/m)
RJX3*H = 1.7918E+07(kN) RJY3*H = 1.0065E+07(kN) RJZ3*H = 0.0000E+00(kN)
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Floor No. 3 Tower No. 1
Xstif= 27.5066(m) Ystif= 87.3051(m) Alf = 0.0000(Degree)
Xmass= 27.2835(m) Ymass= 86.3532(m) Gmass(活荷折减)= 1714.6553( 1540.9554)(t)
Eex = 0.0204 Eey = 0.0488
Ratx = 1.0000 Raty = 1.0000
Ratx1= 1.8211 Raty1= 1.5797
Ratx2= 1.4164 Raty2= 1.3023 薄弱层地震剪力放大系数= 1.00
RJX1 = 4.5318E+07(kN/m) RJY1 = 3.0086E+07(kN/m) RJZ1 = 0.0000E+00(kN/m)
RJX3 = 2.9358E+06(kN/m) RJY3 = 1.6538E+06(kN/m) RJZ3 = 0.0000E+00(kN/m)
RJX3*H = 1.1449E+07(kN) RJY3*H = 6.4498E+06(kN) RJZ3*H = 0.0000E+00(kN)