Experimental Study on Existing Reinforced Concrete Frames Strengthened by L-type Precast Concrete Wall Panels to Earthquake-Proof Buildings

Structural Design Tall Build

2023

Summary There are many strengthening methods made with steel cross members for strengthening the structures with inadequate earthquake behavior. This type of strengthening methods is also effective in buckling of the cross members in the behavior of the structural frames. This buckling may cause partial or complete collapse of the structure. Thus, it is quite important to prevent and limit the formation of buckling in steel crosses. At the TEC 2018, the insulation unit is defined as the elements that can exhibit flexible behavior on the horizontal direction and rigid behavior on the vertical direction under the effect of earthquake loads. The basic principle of using insulation units is that these members can dissipate energy in the carrier system. The originality of this study is to experimentally investigate the damper behavior created by using cylindrical rubber wedges, which can be easily found in the automotive industry, in combination with steel plates and bolts. In this experimental study, the contribution of seismic insulators to the structural element to be strengthened was investigated. The insulators used in this study are considered by analogy with lead‐core rubber insulators. As such seismic lead‐core rubber insulators move under the influence of lateral loads, the lead core inside makes plastic deformation, thus increasing the damping rate. In this insulator study, it is aimed to use U plates or bolts instead of lead core. While vertical loads are covered by rubber support, horizontal loads will be damped due to plastic deformation of U plates or bolts. The five types of seismic dampers were used as 10 B‐type rubber wedge mounted damper (SR), 2 U‐type steel plates damper (SP), 10 M6 steel bolted damper (SB), 2 U‐type steel plates and 10 B‐type rubber wedge mounted damper (SPR), 10 M6 steel bolted, and 10 C‐type rubber wedge mounted damper (SBR). These specimens were tested under lateral loading and constant vertical loading. The results obtained at the end of the tests shall be compared considering the strength, stiffness, and dissipated energy capacities of the specimens.

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Rubber effect on metallic dampers used on the supports of steel cross members

Structural Design Tall Build

2023

“…Response envelope curves were drawn to compare general behaviors of specimens. These envelope curves were drawn by connecting the peak points of each hysteretic curve for each specimen (Ha et al, 2018). Total base shear-top displacement response envelope curves were constructed to evaluate (Wasti and Özcebe, 2012) and given in Figure 9.…”

Section: Comparison Of Strengthmentioning

confidence: 99%

Investigation of Short Column Behaviors at 1/5 Scaled Reinforced Concrete Frames Using Different Strengthening Methods

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

2019

ÖZET: Bu deneysel çalışmadaki amaç, iki güçlendirme methodunda pencere boşluğunun kısa kolon davranışına etkilerini araştırmaktır. Bu çalışmada, iki katlı, 1/5 ölçekli ve tek açıklıklı yedi betonarme çerçeve üretilmiştir. Numuneler, Türkiye'de konut binalarında yaygın olarak görülen çeşitli eksiklikleri içermektedir. Bu numuneler, sabit düşey yük ve yatay yükleme altında test edilmiştir. Birinci numune referans boş çerçeve olarak üretilmiştir. İkinci ve üçüncü numuneler gaz beton bloklu dolgu duvarlı olarak üretilmiştir. Dördüncü ve beşinci numuneler betonarme dolgu duvarları ile güçlendirilmiştir. Altıncı ve yedinci numuneler ise dıştan betonarme duvarlı ve betonarme kolon mantolu olarak güçlendirilmiştir. Tüm numunelerin duvarları, kısa kolon davranışının etkilerini araştırmak için iki farklı pencere boşluğu ile üretilmiştir. Test sonuçları göstermiştir ki, uygulanan güçlendirme yöntemleri, betonarme çerçevenin, yatay yük taşıma kapasitesini, enerji tüketme kapasitesini ve başlangıç rijitliğini önemli derecede artırmıştır. Betonarme kolon mantosu sayesinde dıştan betonarme duvarlı numunelerde kısa kolon davranışı önlenmiştir.Anahtar kelimeler: Betonarme çerçeveler, tersinir tekrarlanır yatay yükleme, güçlendirme, pencere açıklıkları. ABSTRACT:The purpose of in this experimental study is to investigate the effects of short column behavior due to window opening at two strengthening methods. At this study, seven reinforced concrete frames as two stories, 1/5 scaled and one bay were produced. The specimens contained several deficiencies that were commonly observed in residential buildings in Turkey. These specimens were tested under lateral loading and constant vertical loading. First specimen was produced as the reference bare frame. Second and third specimens were produced with infill autoclaved aerated concrete blocks wall. Fourth and fifth specimens were strengthened with infill RC shear wall. Sixth and seventh specimens were strengthened with external RC shear wall and RC column jackets. The walls of all specimens were manufactured with two different windows opening to investigate the effects of short column behavior. The test results showed that these applied strengthening methods have significantly increased the lateral load carrying and energy dissipation capacities, initial stiffness of the RC frame. Thanks to RC column jackets, at specimens with the external RC shear wall was prevented to the short column behavior.

“…Total base shear-top displacement response envelope curves were constructed to evaluate and given in Figure 18. These envelope curves were drawn by connecting the peak points of each hysteretic curve for each specimen (Ha et al, 2018). The lateral load carrying capacities of test specimens are given Table 3.…”

Section: Strengthmentioning

confidence: 99%

1/5 Ölçekli Betonarme Çerçevelere Farklı Güçlendirme Metotları Uygulanması Üzerine Deneysel Çalışmalar

Konya Journal of Engineering Sciences

2019

In this experimental study; five RC frames with a scale of 1/5, single spans and two storey were produced so as to reflect the characteristics of existing structures. Two RC frames were used as the reference specimens that without an infill wall and autoclaved aerated concrete blocks (AAC) infilled wall. Three of these RC frames were strengthened as CFS (Cold Formed Steel) drywall system, infill RC shear wall and both external RC shear wall and column jacketing. All specimens produced were tested under reverse cyclic lateral loading and constant vertical loading. Strength, stiffness and energy dissipation capacities of all test specimens are compared with each other. The lateral load carrying capacity and energy dissipation capacities of strengthened specimens have occurred higher than reference specimens. But initial stiffness and stiffness at the max lateral load of specimen strengthened with CFS drywall system have occurred lower than reference specimen with AACW.