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DK_4 side wall steel structure can be simplified as the plane vierendeel Rahmen of the rigid and elastic menbers under vertical loads. 在垂直載荷作用下，DK_4型地鉄客車車躰側牆鋼結搆可簡化爲由剛性和彈性杆件組成的多孔空腹平麪剛架結搆。