侧向刚度比太小

Floor No. 1 Tower No. 1
Ratx = 1.0000 Raty = 1.0000
Ratx1= 7.2354 Raty1= 11.3495
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Floor No. 2 Tower No. 1
Ratx = 0.1974 Raty = 0.1259
Ratx1= 3.1192 Raty1= 3.7884
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Floor No. 3 Tower No. 1
Ratx = 0.4519 Raty = 0.3771
Ratx1= 1.6684 Raty1= 1.7024
请教一下，工程地下室是2层，地下室顶板是嵌固层，第2层的侧向刚度比怎么比第一层的小这么多啊？