Thus, when we calculate the interior force of sheet, we mainly calculate bending moment and twisting moment.

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In the test model, a new type joint connection of one-way hinge is put forward for achieving pure-hinge connection; In the shape forming test, because of the little post-tensioning forces, a new type loading method of twisting nut for drawing wire is put forward in stead of jack tensioning for solving the questions, such as super-tensioning and the nonuniform rate of loading; In the loadtest, a new type vertical loading system of multiple-point fixed pulley is put forward for solving the questions, such as more loading points and larger vertical force at one loading point.

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According to that, the analyses are made on the internal force, the pulling force, the bending moment and twisting moment which make the chip break.

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twisting force：扭力

twin-tube tunnel 雙管隧道 | twisting force 扭力 | two-bedroom flat 二睡房單位

twisting force：扭轉(zhuǎn)力

twisting center 扭曲中心 | twisting force 扭轉(zhuǎn)力 | twisting moment 扭矩

twisting force：捻轉(zhuǎn)力

twisting bobbin 捻線筒管 | twisting force 捻轉(zhuǎn)力 | twisting frame 捻線機(jī)