質問：タワーの断面慣性モーメントは有効厚さで計算するか、名目厚さで計算するか？
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質問：1、タワーの断面における慣性モーメントは、有効厚さで計算するか、名目厚さで計算するか？2、高次振動形を計算する際、外部に取り付けられたプラットフォームやはしごの質量も質量行列に含めるべきか？
高次振型と低次振型の自重は同じですよね。
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