Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: RC frame

Sortuj według:

Ogranicz wyniki do:

Seismic performance evaluation of a proposed buckling-restrained brace for RC-MRFS

Ebanesar Arunraj, Cruze Daniel, Noroozinejad Farsangi Ehsan, Seenivasan Vinscent Sam Jebadurai, Mohammad Adil Dar, Abdul Rashid Dar, Gladston Hemalatha

Civil and Environmental Engineering Reports

2019

Vol. 29, no. 3

164--173

This paper presents a novel buckling-restrained brace (BRB) where the inner core is restrained by a concrete infilled Expanded Polystyrene Sheet (EPS) instead of the conventional concrete infilled tube section, to resist inner core buckling. It serves two purposes, firstly, the EPS is a ductile material, which is favourable in terms of seismic performance and, secondly, the outer construction material has better corrosion resistance. Thus, the life of the steel core can be prolonged. In this study, 6 BRB specimens were prepared, of which 3 BRB specimens were infilled with concrete and the remaining 3 BRB specimens with concrete and EPSs, in order to study their performance under cyclic loading. Three different core heights, all with the same core thickness, were adopted. The test results indicate that the load-carrying capacity of this novel BRB is higher than the conventional BRB. Further, the length of the steel tube also affects the strength of the seismic disaster mitigation system. Lastly, a numerical study on a single bay RC frame, with and without BRB subjected to time history analysis, was conducted to check the global performance of this novel system. It was found that the structural responses had substantially decreased.

Behavior of damaged masonry infill panels in RC frames subjected to out of plane loads

Pereira M. F. P., Pereira M. F. N., Ferreira J. E. D., Lourenço P.

Architecture Civil Engineering Environment

2012

Vol. 5, no. 3

83-98

The building envelope in Europe is usually made of masonry walls, with enclosure and infill functions. Masonry walls have a major economical importance and contribute significantly to the building performance. Even if infill walls have no load bearing function, they contribute significantly to the seismic behavior of buildings. Therefore, their adequate structural performance is needed, avoiding the occurrence of severe in-plane damage, with very large economical losses, and the out-of plane expulsion, which additionally represents a large risk for human life. Recent earthquake codes in Europe require the safety assessment of non-structural elements (parapets, veneer masonry walls, infill walls, etc.), when their collapse entails risks for people or for the main structure. The Eurocode standards, entering the mandatory stage now, incorporate new requirements to be fulfilled by buildings or their parts. Such is the case of masonry infilled RC frames whose panels, according to Eurocode 8, are explicitly required to withstand the out-of-plane movement induced by earthquakes. Appropriate measures should be taken to avoid brittle failure and premature disintegration of the infill walls, as well as the partial or total out-of-plane collapse of slender masonry panels. This paper presents the experimental work and results achieved by applying cyclic out-of-plane loads to damaged masonry infilled RC frames. The masonry panels were previously damaged by applying an in-plane cyclic load after which the cyclic out-of- plane loads were applied. The frames and panels tested follow the traditional Portuguese RC structure construction system to which different types of reinforcement have been introduced in the panels.

Ściany zewnętrzne w Europie są zwykle wykonywane jako zewnętrzne, spełniające funkcję obudowy i wypełnienia. Ściany murowane mają duże znaczenie ekonomiczne i wpływają istotnie na zachowanie się budynku. Nawet jeżeli ściany wypełniające nie mają funkcji nośnej wpływają znacząco na zachowanie się budynków w warunkach sejsmicznych. Eurokod 8 wyraźnie wymaga aby ściany wypełniające były zdolne do przeniesienia sił powstających w czasie trzęsienia ziemi i nie ulegały kruchemu zniszczeniu. W artykule przedstawiono wyniki badań doświadczalnych ścian murowanych stanowiących wypełnienie ram żelbetowych. W pierwszej kolejności ściany były poddawane były obciążeniom cyklicznym w swojej płaszczyźnie, a następnie obciążeniom cyklicznym przyłożonym poza płaszczyzną.