濟南伸縮蓬廠

　　濟南伸縮蓬作為只能抗拉的軟殼體是不適宜選用這種平面單元的，因為關于剛性殼體來說，這種平板單元能夠看成平面應力單元和平板曲折單元的組合，其單元剛陣可以由這兩種單元剛陣兼并而成。

　　Ji'nan as the only tensile telescopic tarpaulin soft shell is not suitable to use this plane element, because of a rigid shell, the plate element can be seen as combination of plane stress element and plate winding unit, the unit stiffness matrix by the stiffness matrix of the two element and merger.

　　而膜結構作為軟殼體是不能抗彎的，只能靠薄膜曲面的曲率變化，從而導致膜外表中內力重分布來反抗垂直于曲面的外荷載。

　　The membrane structure as a soft shell can not bend, can only rely on the curvature of the film surface changes, resulting in the redistribution of internal forces in the film surface to resist the external load perpendicular to the surface.

　　假如仍是選用這種只有平面內應力的板單元，則應變的線性有些將不反映平面外z方向位移的影響，這導致單元不包含z方向節點反力，就每個單元來說靜力是不平衡的。

　　If the unit is still in use this only in-plane stress, the linear strain, some will not reflect the out of plane displacement of Z direction, which results in the unit does not contain the Z direction of node force, each unit is not static balance.

　　所幸的是應變的非線性有些思考了z向位移的影響，使得各單元兼并起來的總的平衡方程經過不斷迭代能近似到達平衡，缺陷是需要過多的平面內位移來滿意平衡的要求，而實際情況是只需要一定的平面外和平面內的位移及曲率變化就能夠了。

　　Fortunately, some Z strain nonlinear thinking to the effects of the displacement, the equilibrium equations of each unit combined through continuous iteration can approximate to equilibrium, the defect is plane need too much displacement to satisfy the requirement of balance, but the actual situation is just a set of displacement and curvature change of plane and the plane can.

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