free field motion 中文意思是什麼
free field motion
解釋
自由場運動-
Due to the vibration feedback from super structure, the motion of foundation is different from that of free field
上部結構柱頂加速度反應主要由基礎轉動引起的擺動分量組成,平動分量次之,而彈性變形分量很小。 -
Traditional anti - seismic design method all assumes that the ground is rigid and use the displacement of the free field as input ground motion for structure. when the foundation has a huge rigidity and the superstructure has a small rigidity, the assumption is advisable in the engineering range
當基礎剛度很大而上部結構剛度很小時,這種假定在工程精度范圍內是合理的,但當建築物剛度與基礎剛度較為接近或相差不大時,這樣的假定對上部結構反應將產生較大的誤差。
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