The system requirements to create a large space, easy layout architecture. Hard core trade system could be used to the layout in the elevator. Because the core system has the hardness against twisting, bending so big so when large core size, the entire horizontal load by cutting power to bear, core of the second floor where the bridge of the frame is delivered under the action of horizontal load evenly according to height, the floor beams in the column bending moomen was seamless.
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