Assessing the behaviour of RC beams subject to significant gravity loads under cyclic loads

Gião, Rita; Lúcio, Válter José da Guia; Chastre, Carlos

doi:10.1016/j.engstruct.2013.11.012

Cited by 22 publications

(22 citation statements)

References 3 publications

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“…Note that vertical displacement of the upper edges of the walls, which is produced due to the total rotation above them, lifts up one end of the beams, thereby causing them to rotate faster than the rest of the beams located at the same story level. Although the aforesaid connected beams are under considerable rotational demands, experimental and numerical investigations revealed that RC beams under cyclic loads would not fail to transfer gravity loads despite undergoing very large deformation demands . So it might be argued that as long as MRFs convey the expected gravity loads, the seismic performance of RC dual systems should be considered sufficient notwithstanding that some members may get damaged due to substantial rotational demands.…”

Section: Results Of Numerical Analysismentioning

confidence: 99%

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

Estekanchi

Harati

Mashayekhi

2018

Structural Design Tall Build

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Summary Reinforced concrete (RC) dual systems are composed of RC moment‐resisting frames (MRFs) and RC shear walls, where MRFs are barely designed to handle gravity loads. Investigations have demonstrated that shear walls exert negative effects on the upper part of MRFs. In this paper, the interaction of shear walls and MRFs is inspected using endurance time (ET) method. ET is a dynamic time history‐based pushover procedure in which structures are exposed to a set of predefined intensifying ET acceleration functions. In this method, seismic performance of the considered structure is assessed based on earthquake return periods; during which, required predefined seismic performance objectives are fulfilled. In this study, several buildings with RC dual systems were designed based on the conventional codes. Next, their nonlinear duplicates were generated for the application of the ET analysis. It was revealed that shear wall elements impose considerable rotational demands—exceeding the criteria established by ASCE41‐13—on the beams and columns, especially those located on the upper parts of the buildings. This paper puts forth and reviews certain methods to cushion the negative effects brought about by RC shear walls, along with a detailed discussion on their merits and demerits.

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Section: Results Of Numerical Analysismentioning

confidence: 99%

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

Estekanchi

Harati

Mashayekhi

2018

Structural Design Tall Build

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“…Gião vd. [17] tarafından yapılan deneysel incelemede, belirgin düşey yük etkisine maruz kirişlerde statik benzeri testler için esas alınabilecek bir deney prosedürü geliştirilmiş ve fiziksel deney sonuçları ile analitik sonuçlar karşılaştırılmıştır. Ülkemizde de belirgin düşey yük etkisi ile birlikte depremi benzeştiren yüklemenin birlikte dikkate alındığı çalışmalar yapılmıştır.…”

Section: şEkil 1 -Düşey Yük Ve Deprem Etkisi Altındaki Kiriş Mesnet Bunclassified

“…Kuvvet kontrollü adım sonrası nominal yerdeğiştirme sünekliği oranına bağlı olarak belirlenen negatif doğrultudaki yer değiştirme, yerdeğiştirme kontrollü olarak uygulanır. Yerdeğiştirme kontrollü yükleme sonrası, işletme yükü numuneye kuvvet kontrolünde uygulanarak yükleme geçmişinin bir çevrimi tamamlanmaktadır[17].…”

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An Experimental Research on Hysteretic Behavior of RC Beams under Significant Gravity Loads

Aydemir

Yildirim

2020

Teknik Dergi

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Bu çalışmada, düşey işletme yükünün betonarme kirişlerin tersinir çevrimsel davranışına etkileri deneysel olarak incelenmiştir. İşletme yükü benzeşimi için kuvvet, deprem yükü benzeşimi için ise çevrimsel ve artan genlikli yer değiştirme kontrollü yükleme geçmişlerinin kullanıldığı deney programında, düşey yük etkisinin belirgin mertebede olmasının plastik mafsal çalışma biçimi üzerinde etkin olduğu gözlenmiştir. Çalışmada, işletme yükü etkisini içeren ve içermeyen tersinir-çevrimsel yüklemeler uygulanarak elde edilen deneysel sonuçlar birbirleriyle mukayese edilmiş ve ayrıca Türk Deprem Yönetmeliği Hasar Sınırı Yaklaşımı kabulleri yardımıyla elde edilen analitik sonuçlarla da karşılaştırılmıştır. Sınırlı sayıda deney numunesiyle yapılan bu karşılaştırmalarda, düşey yük etkisinin belirgin mertebede olduğu ve yön değiştirmeyen plastik mafsal davranışının meydana geldiği deney numunelerinde, Türk Deprem Yönetmeliği'nde tanımlanan analitik Göçme Hasar Sınırı yer değiştirme değerinin oldukça ihtiyatlı kalabildiği tespit edilmiştir.

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“…Proença et al and Gião et al, took into account the effects of gravity loads on beams (in steel and reinforced concrete beams) besides the quasi‐static cyclic loading. Proença et al applied a combined cyclic and gravity load procedure in steel beam to column connections.…”

Section: Introductionmentioning

confidence: 99%

“…Ductility is observed to decrease as the gravity load increase from 25% to 75% of the designed moment. Gião et al followed similar loading history in reinforced concrete beam specimens, where the gravity load was chosen as the half of the designed flexural moment. This procedure was a combination of forced controlled to impose the gravity load and displacement controlled to apply the reversed cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of cyclic loading test procedure including gravity load on RC beams

Muhaj

Marchão

Lúcio

et al. 2019

Structural Concrete

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Test setups and loading histories aim to replicate the real conditions of the building structures. However, most of the tests on beams found in literature do not include gravity loads in the cyclic loading history. An experimental campaign was carried out. Two beam specimens, named CB0 and CB1, designed to exhibit different failure modes were subjected to a loading protocol that involved the imposition of reversed cyclic loading and simultaneous gravity load. The aim was to validate the test procedure for different beam failure modes. Consequently, specimen CB1 failed by rupture of the tensile reinforcing bars while specimen CB0 failed due to concrete crushing and buckling of the compressed reinforcing bars. Results show that the presented loading protocol does not control the failure mode of the specimens. The specimens were also simulated numerically, and the results were comparable with the experimental observations in terms of load capacities, crack patterns, and failure modes.

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Assessing the behaviour of RC beams subject to significant gravity loads under cyclic loads

Cited by 22 publications

References 3 publications

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

An investigation on the interaction of moment‐resisting frames and shear walls in RC dual systems using endurance time method

An Experimental Research on Hysteretic Behavior of RC Beams under Significant Gravity Loads

Experimental evaluation of cyclic loading test procedure including gravity load on RC beams

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