Unverified85% confidenceDecision RuleTime unknown
两根立柱间距（跨度）建议控制在60-90cm，木质层板跨度超过80cm在承重下会明显下弯；跨度过大时应在中间增加立柱而非依赖层板刚性
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85%
Confidence
Long-term
Relevance
-
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Unverified层板跨度（两立柱间距）超过80cm时必须增加中间支撑或采用金属加固，纯板材/实木悬空跨度过大是下垂的首要原因，建议单跨控制在75cm以内88% similarUnverified跨度＞40cm的横向层板中央下垂明显，木质层板超过60cm跨度需加中间立柱支撑，否则长期承重会弯曲变形88% similarUnverified跨度＞90cm的层板中间无立柱时易下垂，木质/密度板跨度建议控制在80cm内，超过应加中间支撑或改用金属层板86% similarUnverified层板跨度（单格宽度）超过80cm时，板材书架长期承重会出现中间下垂弯曲，藏书用应控制单格宽度≤60cm或增加中间立柱支撑85% similarUnverified落地架宽度超过80cm时优先选带中间立柱或三角加强筋的结构，否则层板长期承重会出现中部下弯，纯两侧支撑的宽层板是变形高发点84% similar
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