NONLINEAR DYNAMIC ASSESSMENT OF THE OUT-OF-PLANE RESPONSE AND BEHAVIOUR FACTOR OF UNREINFORCED MASONRY INFILLS IN REINFORCED CONCRETE BUILDINGS

2019 ◽  
Author(s):  
Paolo Ricci ◽  
Mariano Di Domenico ◽  
Gerardo Mario Verderame
Keyword(s):  
Reinforced Concrete ◽  
Nonlinear Dynamic ◽  
Dynamic Assessment ◽  
Unreinforced Masonry ◽  
Reinforced Concrete Buildings ◽  
Behaviour Factor ◽  
Concrete Buildings ◽  
Masonry Infills ◽  
Out Of Plane

Study on Ground Motion Intensities and Modification for Seismic Analysis of Reinforced Concrete Frames

2014 ◽  
Vol 1065-1069 ◽  
pp. 1438-1442
Author(s):  
Dong An ◽  
Tie Jun Qu
Keyword(s):  
Reinforced Concrete ◽  
Ground Motion ◽  
Nonlinear Dynamic ◽  
Seismic Analysis ◽  
Reinforced Concrete Buildings ◽  
Intensity Measure ◽  
Concrete Buildings ◽  
Dynamic Analyses ◽  
Nonlinear Dynamic Analyses ◽  
Spectrum Matching

The selection of input ground motion for seismic analysis of the structure is a complicated task, especially when nonlinear dynamic analysis is utilized. A decision has to be made regarding the intensity measure better to represent the potential damage of the ground motion. This paper presents a lot of analysis to deal with the problem. A set of nonlinear dynamic analyses were conducted on reinforced concrete buildings widely present in China. Input ground motions contain uncertainty and variability comes from both natural recordings and synthetic data. First, a set of natural recordings is considered. Second, two ground motion modification schemes are used in this study: magnitude scaling and spectrum matching. Third, a set of ground motion is synthesized. The peak value of displacement has been selected as the response parameter better able to represent the structural damage level. Nonlinear dynamic analyses of reinforced concrete buildings simulated by OpenSEES are carried out to evaluate the correlation coefficients of displacement response and the chosen ground motion parameters. Findings from the investigation indicate that the Housner intensity is the more effective intensity measure for selecting the seismic input. The synthesized ground motion fit with code spectrum shows good performance as a design input motion. Considering ground motion modification, spectrum matching is generally more stable in response prediction than scaling.

Dynamic Response of Reinforced Concrete Buildings

1982 ◽  
Author(s):  
Hajime Umemura ◽  
Haruo Takizawa
Keyword(s):  
Reinforced Concrete ◽  
State Of The Art ◽  
Failure Process ◽  
Strong Motion ◽  
Response Analysis ◽  
Reinforced Concrete Buildings ◽  
Concrete Frames ◽  
Plane Failure ◽  
Concrete Buildings ◽  
Out Of Plane

<p>During the last tow decades, remarkable progress has been made toward the better understanding of the performance of reinforced concrete buildings when subjected to destructive earthquake motions. This volume examines the literature with regard to analytical methods for modeling their dynamic failure, and is intended to provide a summary report on the current state of the art.</p> <p>The survey places major emphasis on formulations of a basically empirical nature. Its necessity arises mostly from the complexities inherent in the inelastic and hysteretic response of reinforced concrete. Important aspects are first reviewed for the microscopic or member-by-member modelings, while the interest is then taken in the macroscopic or simple modelings of overall behavior. Their advantages and limitations as well as the directions of future improvement are noted by including simple illustrations. In particular, the examination emphasizes unsatisfactory state of the art for a reliable description of the out-of-plane failure process of structure.</p> <p>An extensive presentation of the bibliography featurs this publication, dealing with the literature up until the middle of 1980 and covering no less than 300 papers. The work will contribute to bringing structural engineers up-to-date with the methods of strong-motion response analysis for reinforced concrete frames.</p>

scholarly journals Observed Behavior of Reinforced Concrete and Unreinforced Masonry Buildings in April 25, 2015 Nepal Earthquake

2016 ◽  
Vol 11 (1) ◽  
pp. 177-181 ◽  
Author(s):  
Yadin Shrestha
Keyword(s):  
Reinforced Concrete ◽  
Soft Soil ◽  
Poor Quality ◽  
Unreinforced Masonry ◽  
Stone Masonry ◽  
Masonry Buildings ◽  
Reinforced Concrete Buildings ◽  
Soft Storey ◽  
Concrete Buildings ◽  
Survey Team

In order to investigate the effects of devastating 7.8 M  Gorkha Earthquake that struck Nepal on 25 April, 2015 and its aftershocks on reinforced concrete and unreinforced masonry buildings, a small survey team was dispatched from Institute of Engineering, Thapathali Campus. From the observation it was found that the earthquake caused extensive damages on the low-strength stone masonry buildings with no seismic detailing. In contrast, most of the reinforced concrete buildings sustained minor to some non-structural damages except in some localized places where the buildings were found to be collapsed by soft storey mechanism. The localized failure of reinforced concrete buildings in Kathmandu w valley and outside may be attributed to amplifcation of waves in thick soft soil deposits, poor quality of construction, inadequate column sizes and lack of ductile detailing.Journal of the Institute of Engineering, 2015, 11(1): 177-181

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