Practical modelling issues for masonry building retrofitted with squat shear wall

2017 ◽  
Vol 26 (14) ◽  
pp. e1380
Author(s):  
Parisa Sartaji ◽  
Abdoreza Sarvghad Moghadam ◽  
Mohsen Ghafory Ashtiany
Keyword(s):  
Shear Wall ◽  
Masonry Building ◽  
Squat Shear Wall

Study on Rational Ratios of Lateral Stiffness for Masonry Building with Frame Structure at First Two Stories

2012 ◽  
Vol 174-177 ◽  
pp. 2012-2015
Author(s):  
Xiao Long Zhou ◽  
Ying Min Li ◽  
Lin Bo Song ◽  
Qian Tan
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Shear Wall ◽  
Calculation Model ◽  
Frame Structure ◽  
Wall Structure ◽  
Masonry Building ◽  
Lateral Stiffness ◽  
Stiffness Ratio ◽  
Lateral Stiffness Ratio

There are two typical seismic damage characteristics to the masonry building with frame shear wall structure at first two stories, and the lateral stiffness ratio of the third storey to the second storey is one of the key factors mostly affecting the seismic performance of this kind of building. However, some factors are not considered sufficiently in current Chinese seismic codes. According to the theory of performance-based seismic design, the seismic performance of this kind of structure is analyzed in this paper by taking time-history analysis on models which with different storey stiffness ratios. The results show that when the lateral stiffness ratio controlled in a reasonable range, the upper masonry deformation can be ensured in a range of elastic roughly, and the bottom frame can be guaranteed to have sufficient deformation and energy dissipation capacity. Finally, according to the seismic performance characteristics of masonry building with frame shear wall structure at first two stories, especially the characteristics under strong earthquakes, a method of simplified calculation model for the upper masonry is discussed in this paper.

Seismic Damage Analysis for Multi-Story Masonry Building with R. C. Frames on Ground Floor

2012 ◽  
Vol 204-208 ◽  
pp. 2555-2558 ◽  
Author(s):  
Duo Zhi Wang ◽  
Jun Wu Dai ◽  
Chen Xiao Zhang
Keyword(s):  
Transition Layer ◽  
Shear Wall ◽  
Seismic Damage ◽  
Masonry Building ◽  
Damage Analysis ◽  
Economic Reason ◽  
Structure System ◽  
Ground Floor ◽  
Floor Structure ◽  
Global Collapse

Multi-story Masonry Building with R. C. Frames on Ground Floor (Framed-Ground Floor Structure for short) which has serious seismic damage and high collapsed rate, is the unreasonable structure system. However, the structure system not be abolished for economic reason. Collapse types of that are divided into collapse of ground floor, collapse of transition layer, global collapse. And seismic damage is also serious for frame column and shear wall. Experiences are obtained from above seismic damage, and the following aspects should be taken into account in the future. 1. The shear wall can be increased to improve stiffness of weak layer. And designer should try to arrange the walls equably. 2. In order to avoid stiffness mutation, stiffness ratio between ground frame and transition layer can be adjusted. 3. Collapse resistant design of Framed-Ground Floor Structures should be emphasized.

Elaborate Failure Model and Seismic Response Analysis for Multi-Story Masonry Building with R. C. Frames on Ground Floor

2013 ◽  
Vol 753-755 ◽  
pp. 504-507 ◽  
Author(s):  
Duo Zhi Wang ◽  
Jun Wu Dai ◽  
Chen Xiao Zhang
Keyword(s):  
Seismic Response ◽  
Horizontal Displacement ◽  
Shear Wall ◽  
Seismic Damage ◽  
Response Analysis ◽  
Masonry Building ◽  
Failure Model ◽  
Seismic Response Analysis ◽  
Ground Floor ◽  
Floor Structure

Framed-Ground Floor Structure for short which has serious seismic damage and high collapsed rate, is the unreasonable structure system. The experiences is 1. The shear wall can be increased to improve stiffness of weak layer. And designer should try to arrange the walls equably. 2. In order to avoid stiffness mutation, stiffness ratio between ground frame and transition layer can be adjusted. 3. Collapse resistant design of Framed-Ground Floor Structures should be emphasized. Then seismic response analysis is conducted by ANSYS. And the seismic response is little, and strength damage or stable damage do not occur for the little acceleration peak. Along with the increasing acceleration peak, The bigger horizontal displacement leads to damage of Framed-Ground Floor Structures. Moreover, the damage is in advance as the increasing acceleration peak.

Vertical Seam Effect on Seismic Performance of Reinforced Concrete Squat Shear Walls with Rectangular Cross-Section

2013 ◽  
Vol 663 ◽  
pp. 159-163
Author(s):  
Hae Jun Yang ◽  
Hyun Do Yun
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Solid Wall ◽  
Rectangular Cross Section ◽  
Shear Walls ◽  
Shear Wall ◽  
Hysteretic Behavior ◽  
Wall Panel ◽  
Squat Shear Wall ◽  
Reversed Cyclic

In this study, two reinforced concrete (RC) squat shear walls with height-to-length ratio of 0.55 and non-ductile reinforcement details are tested under reversed cyclic loading. Emphasis of the study is placed on the hysteretic behavior and cracking procedure of RC squat shear walls in accordance with the presence and absence of vertical seam on the wall panel. Two specimens had the same rectangular cross-section of 1,100 x 50mm, with wall panel heights of 600mm. To investigate the effect of vertical seams on the wall panel on the structural behavior of shear wall, one wall (CON-S) with three vertical seams with dimension of 260 x 40mm was made and the other (CON-N) was a solid wall without seams. The test results indicated that a squat shear wall with vertical seams exhibited more stable hysteretic behavior than a solid shear wall. Vertical seams on the wall panel improve the ductility and energy dissipation capacity but decrease the maximum strength of RC non-ductile squat shear wall.

Seismic Performance of Strain-Hardening Cement Composite (SHCC) Squat Shear Walls with vertical slits

2014 ◽  
Vol 525 ◽  
pp. 427-430
Author(s):  
Zhong Jie Yu ◽  
Seung Ju Han ◽  
Seok Joon Jang ◽  
Hyun Do Yun
Keyword(s):  
Strain Hardening ◽  
Rectangular Cross Section ◽  
Shear Walls ◽  
Cement Composite ◽  
Shear Wall ◽  
Hysteretic Behavior ◽  
Test Results ◽  
Load Carrying ◽  
Squat Shear Wall ◽  
Reversed Cyclic

This study investigates experimentally the applicability of selectively weakening retrofit for existing and non-ductile squat shear walls. To evaluate the effect of vertical seams on the wall panel on the hysteretic behavior and failure mode of Strain-Hardening Cement Composite (SHCC) squat shear walls, two 1/3 scale shear walls with vertical seams as a variable were made and tested under reversed cyclic loadings. All specimens had same rectangular cross-section 1,100mm¡¿50mm, with panel height 600mm. The vertical seam is 40mm wide and 260mm high and 460 high. SHCC for wall specimens was supplied by a local ready mix company with specified strength of 50MPa. The test results of this study; length of the slit is increased in squat shear wall, which the specimen became load-carrying capacity and stiffness. But have vertical silt, the squat shear wall shows aspects of ductility destruction.

Displacement-Based Seismic Design for Reinforced Masonry Shear-Wall Structures, Part 2: Validation with Shake-Table Tests

2015 ◽  
Vol 31 (2) ◽  
pp. 999-1019 ◽  
Author(s):  
Farhad Ahmadi ◽  
Marios Mavros ◽  
Richard E. Klingner ◽  
Benson Shing ◽  
David McLean
Keyword(s):  
Seismic Design ◽  
Design Procedure ◽  
Shear Wall ◽  
Masonry Building ◽  
Shake Table ◽  
Wall Structures ◽  
Reinforced Masonry ◽  
Displacement Based ◽  
Masonry Shear Wall ◽  
Displacement Based Seismic Design

This paper provides a comprehensive validation of a displacement-based seismic design procedure proposed in a companion paper for reinforced masonry shear-wall structures. For this purpose, a full-scale, two-story reinforced masonry specimen was tested on a shake table to examine the global and local behaviors of a low-rise reinforced masonry building designed by the proposed displacement-based procedure, and to validate the analytical tool used in the design process. This specimen successfully resisted repeated ground motions with intensities up to the maximum considered earthquake (MCE). Its performance on the shake-table demonstrates that a reinforced masonry structure designed, detailed, and constructed according to the proposed displacement-based design procedure can resist MCE earthquakes without collapse even though it may suffer severe damage. In critical regions of this specimen, elements detailed in accordance with displacement-based requirements showed more inelastic deformation capacity than the deformation limits imposed by the displacement-based design provisions proposed here. The proposed procedure produces structures that behave according to design expectations, even though severely damaged.

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