دراسة سلوك جدران القص (المستوية والمتقاطعة) في الجمل الثنائية من البيتون المسلح تحت تأثير الانهيار المتتابع

Abstract

Structures are exposed to various threats (earthquakes, explosions, terrorist acts, etc.),in which structural elements subject  to exceptional, unconventional loads that cause stresses which exceed the bearing capacity of these elements. The collapse of an element or a group of elements may cause the collapse of the entire structure or a large part of it, especially in important buildings (schools, hospitals, trade centers, etc.), resulting in fatalities and high repair costs, in addition to the cessation of the operational function of these buildings.The US Department of Defense has developed various methods to resist progressive collapse by removing vertical load-bearing elements (columns or parts of shear walls) from specific locations to assess the ability of the structural system to resist local failure without causing a series of failures disproportionate to the main cause.In this study, the structural response of a building located in the third seismic zone with dual system (frames - shear walls) designed according to the Syrian Arab Code and its second appendix was evaluated under partial removal of the  intersecting and planner shear walls from different stories and how to improve the shear wall response after removal was investigated. The results of the study indicated that half-length removal of the intersecting shear walls from one side from different stories did not cause structural failure and the building maintained its operational function, while half-length removal in both directions at the level of the first story and at the story above the location of change in wall size caused structural failure. By increasing the concrete compressive strength for the intersecting shear walls by 25%, the behavior of the wall improves and satisfies the acceptance criteria.For the plan shear wall, Half-length removal from different stories satisfied the acceptance criteria. The behavior of the intersecting and plann shear walls improves significantly and the resistance against progressive collapse increases according to partial removal in the upper stories.