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Torsional behavior of multistory RC frame structures due to asymmetric seismic interaction

机译：非对称地震相互作用引起的多层RC框架结构的扭转行为

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摘要

Collisions between structures due to seismic oscillations have been reported many times in literature as a common case of damage. Further it is quite usual seismically induced oscillations of a structure in a city center block of buildings to be partly restrained in lateral displacements and therefore torsional behavior to be introduced in the structure. Two different types of structural interaction may be defined: (a) Diaphragm-to-diaphragm collisions (Type A). (b) The floor levels of the two structures are different. Consequently during the seismic oscillations the diaphragms of the first one impact the columns of the other (Type B or interstory pounding). In this work the cases of an 8-story reinforced concrete building that suffers pounding with an adjacent structure that has 1, 2, 3, 4, 5, 6, 7 or 8 stories are studied. Pounding occurs only in one (Case 1) or in two (Case 2) columns of the structures and since the other columns are free to move without restrictions a torsional behavior is introduced (asymmetric pounding). Moreover in Type B interaction these columns of the 8 story frame structure undergo impacts at a height equal to 2/3 of their deformable length from the diaphragms of the other structure. The influence of an initial distance between the two interacting structures on the torsion effect is investigated too. Nonlinear seismic step-by-step analyses are performed. More than two hundred pounding cases with torsional effect each one for three natural seismic excitations are studied. Results in terms of shear and ductility demands of the columns are presented and commented. Both types A and B yielded high torsional structural rotation. In interaction Type B it can be deduced from the cases under examination that the column that is endured the impact from the top floor of the other structure develops high shear demands that exceed the available capacity many times during the step-by-step seismic analysis. Moreover high ductility demands have been observed for this column. Finally it is concluded that for buildings that may undergo asymmetric pounding not taking it into account may lead under certain conditions to non-secure design or even critical situations.
机译：在文献中已多次报道了由于地震振荡引起的结构之间的碰撞，这是常见的破坏案例。此外，在建筑物的城市中心区中，很常见的是由地震引起的结构的振动被部分地限制在横向位移中，因此将扭转行为引入到该结构中。可以定义两种不同类型的结构相互作用：（a）膜片到膜片的碰撞（类型A）。 （b）两种结构的地板高度不同。因此，在地震振荡期间，第一个振动膜撞击另一个振动膜的列（B型或层间冲击）。在这项工作中，研究了一座8层钢筋混凝土建筑，该建筑遭受了与具有1、2、3、4、5、6、7或8层的相邻结构的撞击。撞击仅发生在结构的一个（案例1）或两个（案例2）列中，并且由于其他列可以不受限制地自由移动，因此会引入扭转行为（不对称撞击）。此外，在B型交互作用中，8层框架结构的这些列在与其他结构的膜片相等的可变形长度的2/3的高度受到冲击。还研究了两个相互作用结构之间的初始距离对扭转效应的影响。进行非线性地震分步分析。研究了三百个自然地震激励中具有扭转效应的200多个冲击箱。提出并评论了有关柱的剪切和延性要求的结果。 A型和B型都产生了高扭转结构旋转。在交互作用类型B中，可以从所检查的情况推断出，承受其他结构顶层冲击的柱产生的高剪切力要求在逐步地震分析过程中多次超过可用能力。此外，已经观察到对该柱的高延展性要求。最后得出的结论是，对于可能遭受非对称冲击的建筑物，在某些情况下不加以考虑可能会导致设计不安全甚至是危急情况。

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