NON-LINEAR SEISMIC RESPONSE OF REINFORCED CONCRETE SLIT SHEAR WALLS

1999 ◽  
Vol 226 (4) ◽  
pp. 701-718 ◽  
Author(s):  
A.K.H. KWAN ◽  
H. DAI ◽  
Y.K. CHEUNG
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Shear Walls ◽  
Non Linear

scholarly journals Seismic Behavior of a Class of Mixed Reinforced Concrete-Steel Buildings Subjected to Near-Fault Motions

2021 ◽  
Vol 6 (12) ◽  
pp. 172
Author(s):  
Paraskevi K. Askouni ◽  
George A. Papagiannopoulos
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Seismic Design ◽  
Seismic Behavior ◽  
Time History ◽  
Steel Buildings ◽  
Seismic Codes ◽  
Near Fault ◽  
Non Linear ◽  
Story Drift

This paper investigates the seismic behavior of a class of mixed reinforced concrete­–­steel buildings. In particular, mixed buildings constructed by r/c (reinforced concrete) at their lower story(ies) and structural steel at their upper story(ies) are studied from the viewpoint of their wide application in engineering praxis. The need to investigate the seismic behavior for this type of mixed buildings arises from the fact that the existent literature is small and that modern seismic codes do not offer specific seismic design recommendations for them. To study the seismic behavior of mixed r/c-steel buildings, a 3-D numerical model is employed and five realistic r/c-steel mixed buildings are simulated. Two cases of the support condition, i.e., fixed or pinned, of the lowest steel story to the upper r/c one are examined. The r/c and steel parts of the mixed buildings are initially designed as separate structures by making use of the relevant seismic design guidelines of Eurocode 8, and then the seismic response of these buildings is computed through non-linear time-history analyses. The special category of near-fault seismic motions is selected in these time-history analyses to force the mixed r/c-steel buildings under study to exhibit a strong non-linear response. Seismic response indices in terms of inter-story drift ratio, residual inter-story drift ratio and peak floor absolute accelerations are computed. The maximum values of these indices are discussed by comparing the two aforementioned kinds of support conditions and checking the satisfaction of specific seismic performance limits. Conclusions regarding the expected seismic behavior of mixed r/c-steel buildings under near-fault seismic motions are drawn. Finally, the need to introduce specific design recommendations for mixed r/c-steel buildings in modern seismic codes is stressed.

scholarly journals Effect of Masonry Infill Panels on the Seismic Response of Reinforced Concrete Frame Structures

2021 ◽  
Vol 7 (11) ◽  
pp. 1853-1867
Author(s):  
Ali Zine ◽  
Abdelkrim Kadid ◽  
Abdallah Zatar
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Pushover Analysis ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
Concrete Frame ◽  
Capacity Curves ◽  
Infill Panels ◽  
Highly Nonlinear ◽  
Non Linear

The present work concerns the numerical investigation of reinforced concrete frame buildings containing masonry infill panel under seismic loading that are widely used even in high seismicity areas. In seismic zones, these frames with masonry infill panels are generally considered as higher earthquake risk buildings. As a result there is a growing need to evaluate their level of seismic performance. The numerical modelling of infilled frames structures is a complex task, as they exhibit highly nonlinear inelastic behaviour, due to the interaction of the masonry infill panel and the surrounding frame. The available modelling approaches for masonry infill can be grouped into two principal types; Micro models and Macro models. A two dimensional model of the structure is used to carry out non-linear static analysis. Beams and columns are modelled as non-linear with lumped plasticity where the hinges are concentrated at both ends of the beams and the columns. This study is based on structures with design and detailing characteristics typical of Algerian construction model. In this regard, a non-linear pushover analysis has been conducted on three considered structures, of two, four and eight stories. Each structure is analysed as a bare frame and with two different infill configurations (totally infilled, and partially infilled). The main results that can be obtained from a pushover analysis are the capacity curves and the distribution of plastic hinges in structures. The addition of infill walls results in an increase in both the rigidity and strength of the structures. The results indicate that the presence of non-structural masonry infills can significantly modify the seismic response of reinforced concrete "frames". The initial rigidity and strength of the fully filled frame are considerably improved and the patterns of the hinges are influenced by structural elements type depending on the dynamic characteristics of the structures. Doi: 10.28991/cej-2021-03091764 Full Text: PDF

scholarly journals An economic solution for stabilising a slender arch roof

1986 ◽  
Vol 19 (2) ◽  
pp. 93-103
Author(s):  
D. D. Spurr
Keyword(s):  
Reinforced Concrete ◽  
Computer Program ◽  
Seismic Response ◽  
Special Study ◽  
Concrete Cracking ◽  
Linear Dynamic ◽  
Earthquake Records ◽  
Dynamic Analyses ◽  
Non Linear ◽  
Prestressing Strand

A special study was made to evaluate the seismic response of the ribs of four reinforced concrete arch aircraft hangars and to assess methods of strengthening the ribs. The study was based on a series of non linear dynamic analyses of the arch ribs, with particular consideration being given to the choice of earthquake records, to the effect of P-delta actions on the arch responses and to the validity of the behaviour predicted by the computer program. The analyses indicated that the arch ribs could become unstable as a result of the P-delta effect acting in combination with reduction in the rib stiffness due to concrete cracking. However, the study also shows that the arches can be stablised very economically by using prestressing strand to provide cross bracing.

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