Geçiş Katının Köşe Kolon ve Perde Çıkarımları Altında Betonarme Yapıların Aşamalı Göçme Mekanizmalarındaki Rolü

Öz

Geçiş katlı yapıların yüksek hasar görebilirlikleri ve yapısal karmaşıklıkları, aşamalı göçme halinde ciddi hasarlara sebebiyet vermektedir. Bu çalışma, bu tür yapılarda, aşamalı göçme mekanizmasının doğasını ve elemanlar arası yeniden yük dağılımı hakkında yeni görüşler içermektedir. Tasarlanmış geçiş katlı betonarme sistem, köşe kolonları çıkarılmaları altında, sonlu elemanlar analizi kapsamında analiz edilmiştir. Her eleman çıkarımından sonra, kirişlerin eksenel yük yeniden dağılımları, düşey taşıyıcı elemanların talep-kapasite oranları, etkileşim diyagramları incelenmiştir. Geçiş katının altında ve üstünde olmak üzere, sistemde basınç kemerlenmesi ve çekme rijitliği mekanizmalarının dağılımı detaylı bir biçimde irdelenmiştir. Aşamalı göçme süresince, talep kapasite oranlarındaki artış özellikle ilk katlarda çok daha yüksek bulunmuştur. Geçiş katı altında baskın çekme rijitliği mekanizması açık bir şekilde görülürken, üstünde ise baskın basınç kemerlenmesi mekanizması çekme rijitliği mekanizması ile birlikte yeniden yük dağılımı ve dağılıma destek çıkacak eleman karakteristiklerine uygun olarak gözlemlenmiştir. Bulgular kapsamında, perde-çerçeve etkileşimi, dış desteklerin kısıtlayıcı etkisi ve geçiş katının şekil değiştirme esaslı özellikleri, yeniden yük dağılımını belirleyen ve aşamalı göçme mekanizmalarını yöneten esas parametreler olduğu bulunmuştur.

Anahtar Kelimeler

• Aşamalı göçme
• geçiş katı
• basınç kemerlenmesi etkisi
• çekme rijitliği etkisi

Role of Transfer Floor in Progressive Collapse Mechanisms of Reinforced Concrete Buildings under Corner Column and Shear Wall Removals

Öz

The structural complexity and higher vulnerability of the buildings with transfer floors may cause serious damages under progressive collapse. This study provides new insights into the load redistribution between elements and the nature of progressive collapse mechanisms in these types of buildings. The designed reinforced concrete structural system with transfer floor is analyzed within finite element method under corner column removal sequence. The axial force redistributions of beams, demand-capacity ratios (DCR), interaction diagrams of vertical bearing elements are examined after each removal. The distributions of arching and catenary mechanisms are discussed in a detailed way for the portions of system above and below transfer structure. During progressive collapse, the increase in DCRs is particularly higher in the first floors, while the dominant catenary action can be clearly seen below the transfer floor, the dominant arching mechanism is monitored together with tensile catenary according to the load redistribution and redundancy characteristics of the system. In the context of the findings, the wall-frame interaction, the restraining effect of outriggers and the deformational characteristics of transfer plate are found to be the main parameters which configure load redistribution and govern the progressive collapse mechanisms.

Anahtar Kelimeler

• Progressive collapse
• transfer floor
• compressive arch action
• tensile catenary action

Destekleyen Kurum

The author has not received any financial support for the research, authorship, or publication of this study.

Etik Beyan

This study does not require ethics committee approval or any special permission. The relevant form has been completed.

Teşekkür

This study does not require any specific acknowledgement.

Kaynakça

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