关于单层厂房中支撑的作用,不正确的说法是
A.柱间支撑可以提高厂房的纵向刚度和稳定性
B.屋架上弦横向水平支撑可改善抗风柱的受力状态
C.屋架下弦水平系杆可防止屋架下弦发生侧向颤动
D.下弦纵向水平支撑不能提高厂房的横向水平刚度
正确答案是D
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