混凝土空间板柱结构的震致落层倒塌分析

根据2个具有薄弱层的三层混凝土空间板柱结构模型的震致落层倒塌试验结果,分析了倒塌碰撞过程中模型各层的层间剪力时程曲线,并与倒塌前的相应曲线进行了对比；近似估算了倒塌碰撞过程中模型各层的等效层间剪力及其冲量,并与简化的静止倒塌模型碰撞时上部结构所受水平冲量进行了比较.研究表明:(1)倒塌碰撞时模型各层产生了时间很短但量值较大的等效层间剪力,这对结构非薄弱层的抗侧能力是一个考验；2)薄弱层及其以上部分自重增加,将使碰撞过程中各层的层间剪力显著增大；(3)按静止倒塌模型计算得到的上部结构所受水平冲量约为等效点百分数等于0时试验模型相同位置水平冲量的4～5倍.

Analysis of Pancake Collapse of RC Space Slab-Column Structures Under Earthquake

Based on the test results of two three-story RC(Reinforced Concrete) space slab-column structure mo-dels with weak stories,the interstory shear force-time curve during the pancake collapse under earthquake is analyzed for each story and is compared with that before the collapse.Then,the equivalent interstory shear force and its impulse on each story in the impact process are approximately estimated and compared with the lateral impulse to the upper structure of a simple model in the static initial state.The results show that(1) pancake collapse impact results in equivalent interstory shear forces with large values and very short durations in each story of the test model,which is a challenge to the lateral deformation-resisting capacity of non-weak stories;(2) with the increase in the structural weight over the weak story,the interstory shear forces in the impact process significantly increase;and(3) under the pancake collapse impact,the lateral impulse to the upper structure of a simple model in the static initial state is about 4~5 times that of the test model at the same location with an equivalence point being zero percentage.