The methods of load balance of moment limiting and speed softening mode under torque control model and velocity mode are put forward.

提出了在转矩模式、速度模式下力矩限幅和速度软化方式的负荷平衡方法。

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The numerical results also show that the softening of steel under fire and impact load of top floors are the two main reasons for the collapse.

计算结果说明，世界贸易中心倒塌的直接原因是火灾导致的钢材软化和楼板塌落冲击荷载引起的连锁反应。

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