Abstract: During last few decades, the researchers have developed new structural systems which have no or minor damage after being hit by severe events like earthquake. Development of self-centering wall having alternative energy dissipation mechanisms was one of these achievements. A wide variety of rocking wall systems, such as jointed walls, hybrid walls, precast walls with end columns (PreWEC), and PreWEC core wall systems, are proposed and studied. This paper describes an analytical investigation of the lateral load behavior of two new types of hybrid rocking wall systems. Core rocking wall is achieved by merging four single hybrid rocking walls and coupled rocking wall is accomplished by coupling two rocking walls using embedded reinforced concrete beams. The concept of coupling hybrid rocking walls using embedded reinforced coupling beam is emerged from previous coupled conventional shear walls studies. As single rocking wall system, in coupled and core rocking wall, post-tensioning tendons are used as a mean to provide self-centering force, and mild steel bars are used to dissipate energy. The nonlinear behavior of the wall is due to the gap opening at the base joint. Three-dimensional finite element model of each system was developed. The stress distribution, crack propagation, and critical sections of these systems are investigated. The effect of spalling concrete cover in the toe region due to rocking action is explained. In addition, the reduction in stiffness and lateral load resisting capacity of the systems due to cracks is monitored. Finally, the lateral load behavior of single rocking walls is compared to that of core and coupled rocking wall systems.

Abstract In this study, the out-of-plane response of infill walls that are widely used in Turkey and the surrounding regions were experimentally investigated. Several out-of-plane wall tests were performed in the laboratory, with the walls specimens produced with lateral hollow clay bricks (LHCB) and different mortar qualities. The walls were tested in their out-of-plane (OOP) direction under static load conditions and evaluated based on the load-bearing and energy dissipation capacities, crack propagations, mortar strengths, and initial stiffnesses. These walls are experimentally investigated to understand the effects of the mortar strength on the infill wall structural behaviors and to assess the effectiveness of the out-of-plane strength formulations. It was found that when the mortar strength is low, the first major crack occurs at the mortar, however, because of the arch mechanism efficiency in this situation the OOP load-carrying and energy dissipation capacities of unreinforced walls can be significantly increased. When the first major crack in the wall occurs in the brick itself, the arc mechanism is provided with delicate sections in the brick, which leads to strength decreasing in the walls. In this case, excessive deviations occur in the out-of-plane strength formulations estimates. This study shows that the arc mechanism, the damage start region and progress can change significantly unreinforced masonry (URM) infill walls behaviors.

JUSTIFICATIVA: Historicamente, as guerras e seus desafios afligem a humanidade. Na Síria, lesões graves ocorreram devido às armas de fogo e explosivos usados na guerra entre as forças governamentais e civis durante um período de mais de dois anos. MATERIAIS E MÉTODOS: O estudo incluiu 364 pacientes, admitidos no Hospital da Universidade Mustafa Kemal da Faculdade de Medicina (Hatay, Turquia) e submetidos à cirurgia. Os sobreviventes e não sobreviventes foram comparados quanto ao local e tipo da lesão e número de transfusões administradas. A taxa de mortalidade encontrada neste estudo também foi comparada àquelas relatadas em outras guerras civis. RESULTADOS: A média de idade foi de 29 (3-68) anos. Os principais locais de lesão incluíram extremidades (56,0%), cabeça (20,1%), abdome (16,2%), estruturas vasculares (4,4%) e tórax (3,3%). Os tipos de lesões incluíram ferimento de arma de fogo (64,4%), lesão causada por explosão (34,4%) e ferimentos diversos (1,2%). A taxa de sobrevivência foi de 89,6%, enquanto a taxa de mortalidade foi de 10,4%. Observou-se uma diferença significativa entre as taxas de mortalidade neste estudo e aquelas relatadas para as guerras civis da Bósnia e Líbano; e a diferença ficou extremamente significativa quando comparada com as taxas de mortalidade relatadas para as guerras civis do Vietnã e do Afeganistão. CONCLUSÃO: Dentre as lesões relacionadas à guerra, a maior taxa de mortalidade foi observada em lesões de cabeça-pescoço, abdome e vasculares. Acreditamos que a maior taxa de mortalidade na Guerra Civil da Síria, em comparação com as guerras da Bósnia, Vietnã, Líbano Afeganistão, se deva ao fato de os civis terem sido vistos como alvo direto durante a guerra.

BACKGROUND: wars and its challenges have historically afflicted humanity. In Syria, severe injuries occurred due to firearms and explosives used in the war between government forces and civilians for a period of over 2 years. MATERIALS AND METHODS: the study included 364 cases, who were admitted to Mustafa Kemal University Hospital, Medicine School (Hatay, Turkey), and underwent surgery. Survivors and non-survivors were compared regarding injury site, injury type and number of transfusions given. The mortality rate found in this study was also compared to those reported in other civil wars. RESULTS: the mean age was 29 (3-68) years. Major sites of injury included extremities (56.0%), head (20.1%), abdomen (16.2%), vascular structures (4.4%) and thorax (3.3%). Injury types included firearm injury (64.4%), blast injury (34.4%) and miscellaneous injuries (1.2%). Survival rate was 89.6% while mortality rate was 10.4%. A significant difference was observed between mortality rates in this study and those reported for the Bosnia and Lebanon civil wars; and the difference became extremely prominent when compared to mortality rates reported for Vietnam and Afghanistan civil wars. CONCLUSION: among injuries related to war, the highest rate of mortality was observed in head-neck, abdomen and vascular injuries. We believe that the higher mortality rate in the Syrian Civil War, compared to the Bosnia, Vietnam, Lebanon and Afghanistan wars, is due to seeing civilians as a direct target during war.