scholarly journals Seismic Performance of Multistorey Masonry Structure with Openings Repaired with CFRP Grid

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jin-Ben Gu ◽  
Yi Tao ◽  
Ren Xin ◽  
Z. Yang ◽  
Qing-Xuan Shi
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Masonry Wall ◽  
Masonry Structure ◽  
Shear Capacity ◽  
Seismic Resistance ◽  
Masonry Structures ◽  
Frp Composites ◽  
Energy Dissipation Capacity

FRP composites have been used for strengthening RC and masonry structures for decades. However, the researches on repairing multistorey masonry structures using FRP grids were relative less. In the present paper, an experimental study on the seismic performance of multistorey masonry structure with openings repaired with CFRP grid is introduced. Specifically, a 1/3-scale three-floor masonry wall with window openings was tested under quasistatic action to simulate the seismic damages. The damaged masonry wall was then repaired by externally bonding CFRP grids to the areas where the cracks intensively occurred. The repaired masonry wall was retested under the same loading to investigate the seismic resistance and assess the recovery attributed from the CFRP grid repairing. The findings of this study showed that CFRP grid repairing could effectively postpone or even prevent the occurrence and development of cracking. The seismic resistance of the masonry, including shear capacity, energy dissipation capacity, deformability, stiffness degradation, and ductility, was restored. The application of CFRP grid may shift the failure mechanism of the multistorey masonry wall. The recommendation of repair scheme for the similar structures was also proposed in accordance with the findings of the present work.

scholarly journals Experimental Research on Seismic Performance of Damaged Brick Walls Strengthened with Embedded Horizontal Steel Bars

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Liu Tingbin ◽  
Jia Rubo ◽  
Pei Xianke ◽  
Zhang Jiawei ◽  
Zhao Jianchang
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Masonry Wall ◽  
Shear Capacity ◽  
Brick Masonry ◽  
Reconstruction Process ◽  
Skeleton Curve ◽  
Aspect Ratios ◽  
Steel Bars ◽  
Energy Dissipation Capacity

Six brick masonry specimens (two unreinforced specimens, two reinforced specimens, and two specimens reinforced after being damaged), which have different aspect ratios, were tested under low-frequency cyclic loading. The seismic performances of these specimens, including failure characteristics, deformation capacity, carrying capacity, energy dissipation capacity, hysteresis characteristics, and stiffness degradation, were analyzed. The following results were obtained: the ductility of the damaged walls could be significantly improved after they were reinforced with embedded horizontal steel bars; the ultimate shear capacity of the damaged brick masonry walls with the aspect ratios of 1.8 and 0.5 was improved by 6.8% and 4.7%, respectively; the displacement corresponding to the ultimate bearing capacity was close to that of the unreinforced brick masonry wall; the hysteresis loop of the reinforced wall became plumper and encompassed a larger area; after the ultimate load was reached, a clear yielding platform appeared in the skeleton curve of the reinforced wall; the reinforced wall exhibited good ductility, after entering plastic stage; the energy dissipation capacity of the reinforced wall was significantly greater than that of the unreinforced wall. In conclusion, the seismic performance of the damaged brick masonry wall can be improved by embedding horizontal steel bars, and this reinforcing method can be applied in the postseismic reconstruction process.

Experimental Study on Seismic Performance of the Reinforced Concrete Grid-Mesh Frame Wall

2013 ◽  
Vol 680 ◽  
pp. 234-238
Author(s):  
Jin Li Qiao ◽  
Wen Ling Tian ◽  
Ming Jie Zhou ◽  
Fang Lu Jiang ◽  
Kun Zhao
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Seismic Energy ◽  
Width Ratio ◽  
Filling Material ◽  
Energy Dissipation Capacity ◽  
Grid Mesh

In order to validate the seismic performance of reinforced concrete grid-mesh frame wall , four grid frame walls in half size is made with different height-width ratios and different grid forms in the paper. Two of them are filling with cast-in-place plaster as filling material. According to the experimental results of these four walls subjected to horizontal reciprocating loads, we know that the grid-mesh frame wall's breaking form are in stages and multiple modes, and the main influencing factors are height-width ratio and grid form, what's more, with cast-in-place plaster as fill material, could not only improve the level of the wall bearing capacity and stiffness, but also improve the ductility and seismic energy dissipation capacity.

Seismic Performance of Haunched Beam Transfer Structures of Frame-Supported Short-Leg Shearwall with Varied Ratio of Short-Leg Shearwall Section Height to Thickness

2011 ◽  
Vol 255-260 ◽  
pp. 2308-2312
Author(s):  
Yong Qi ◽  
Ci Mian Zhu ◽  
Shu Sheng Zhong ◽  
Fang Wang ◽  
Yang Xiang
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Behavior ◽  
Low Frequency ◽  
Beam Structure ◽  
Beam Structures ◽  
Cyclic Lateral Load ◽  
Energy Dissipation Capacity ◽  
Seismic Tests

This paper deals with an experimental study on the seismic performance of haunched transfer beam structures with varied ratio of section height to thickness of short-leg shearwall (RHT). Based on the seismic tests of three 1:3-scaled specimens under low-frequency cyclic lateral load with constant vertical actions, the failure pattern, the hysteresis curves, the skeleton curves, the energy dissipation capacity, and the stiffness degradation laws of haunched transfer beam structures are investigated. The effects of different RHT (i.e., 5, 6 and 7) on the seismic performance of haunched transfer beam structures are emphasized and analyzed in detail. It is concluded that the rigidity of the structure is noticeable enhanced, the endogen force becomes more evenly distributed and the bearing is more rational with an increase of the RHT; the rationally designed haunched transfer beam structure has a good seismic behavior.

scholarly journals On the Seismic Performance of Autoclaved Aerated Concrete Self-Insulation Block Walls

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2942
Author(s):  
Yun Liu ◽  
Gonglian Chen ◽  
Zhipeng Wang ◽  
Zhen Chen ◽  
Yujia Gao ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Shear Capacity ◽  
Seismic Load ◽  
Masonry Walls ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Energy Dissipation Capacity ◽  
Insulation Block

Autoclaved aerated concrete (AAC) self-insulation block masonry is often used for the infill walls in steel and concrete frame structures. To work together with the frame under earthquake action, it is essential to understand the seismic behavior of AAC self-insulation block masonry walls. In this paper, six AAC self-insulation block masonry walls were experimentally studied under the pseudo static test. The load-displacement hysteretic curves were drawn with the test data. The failure characteristics, loading capacity, stiffness degeneration, energy dissipation capacity and hysteretic behavior are analyzed. The results indicate that the blocks underwent internal failure due to the lower strength with a larger size, but the walls had good energy dissipation capacity with a rational bearing capacity. Accompanied by the influence of vertical compressive stress on the top surface of the walls, the cracking resistance, ultimate bearing capacity, deformability and energy dissipation capacity of the walls were affected by the masonry mortar joints. Comparatively, the walls with thin-layer mortar joints had better seismic performance than those with insulation mortar joints or with vertical joints filled by mineral wool plates. Finally, the shear capacity of the walls under seismic load is evaluated referring to the formulas of current design codes for masonry walls.

scholarly journals Experimental Study on Seismic Performance of Old Masonry Walls

2020 ◽  
Vol 20 (6) ◽  
pp. 151-157
Author(s):  
Hoijin Kim ◽  
Zheongzun Yi ◽  
Jongsup Park ◽  
Junsuk Kang
Keyword(s):  
Experimental Study ◽  
Seismic Performance ◽  
Initial Crack ◽  
Masonry Wall ◽  
Masonry Structure ◽  
Risk Level ◽  
Control Group ◽  
Masonry Walls ◽  
Masonry Building ◽  
Expected Increase

Due to the increase in the frequency and intensity of earthquakes and the number of old buildings and in Korea, there is an expected increase in the damage to life and property. Therefore, we intend to derive an indicator to evaluate the risk level by conducting a seismic test on old buildings. An initial crack was generated in the masonry structure to reflect the deterioration. The effect of the deterioration on the building was subsequently analyzed by comparing it with the uncracked control group. As a result, the masonry wall, which was the specimen, satisfied the seismic performance, but local failure occurred along the initial crack in the specimen considering the aging. The safety was significantly decreased due to the occurrence of additional cracks. This demonstrates that the cracks caused by the aging of the masonry building greatly damaged the seismic performance of the building.

Study on Seismic Performance of CFST Frame and Truss

2013 ◽  
Vol 438-439 ◽  
pp. 1529-1532
Author(s):  
Ya Bin Yang ◽  
Wan Lin Cao
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Carrying Capacity ◽  
Steel Tube ◽  
Load Carrying Capacity ◽  
Scale Models ◽  
Load Carrying ◽  
Energy Dissipation Capacity

Concrete filled steel tube (CFST) got a good application in actual project. In order to further the seismic performance of the CFST, experiment was carried on two 1/5 scale models, which included one CFST frame, one CFST truss. Based on the experimental study, load-carrying capacity, stiffness, ductility, hysteretic property, energy dissipation and failure phenomena of each model were analyzed. The study shows that the seismic performance of CFST truss has high bearing capacity, stiffness, energy dissipation capacity and good ductility.

Experimental study on seismic performance of suspended ceiling components

2021 ◽  
Author(s):  
Yong Wang ◽  
Huanjun Jiang ◽  
Chen Wu ◽  
Zihui Xu ◽  
Zhiyuan Qin
Keyword(s):  
Experimental Study ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Seismic Vulnerability ◽  
Axial Loading ◽  
Deformation Capacity ◽  
Severe Damage ◽  
Strong Earthquakes ◽  
Static Tests ◽  
Load Carrying

<p>Suspended ceiling systems (SCSs) experienced severe damage during strong earthquakes that occurred in recent years. The capacity of the ceiling component is a crucial factor affecting the seismic performance of SCS. Therefore, a series of static tests on suspended ceiling components under monotonic and cyclic loadings were carried out to investigate the seismic performance of the ceiling components. The ceiling components include main tee splices, cross tee latches and peripheral attachments. All specimens were tested under axial loading. Additionally, the static tests of cross tee latches subjected to shear and bending loadings were performed due to their seismic vulnerability. The failure pattern, load-carrying ability, deformation capacity and energy dissipation of the ceiling components are presented in detail in this study.</p>

Experimental study on seismic performance of fire-exposed perforated brick masonry wall

2018 ◽  
Vol 180 ◽  
pp. 77-91 ◽  
Author(s):  
Jin Zhang ◽  
Hao Ma ◽  
Cheng Li ◽  
Qingfeng Xu ◽  
Weibin Li
Keyword(s):  
Experimental Study ◽  
Seismic Performance ◽  
Masonry Wall ◽  
Brick Masonry

Seismic performance of new adobe bricks masonry: Design and experiment

2021 ◽  
pp. 136943322110463
Author(s):  
Tiegang Zhou ◽  
Xin Wang ◽  
Ben Ma ◽  
Zaiyu Zhang ◽  
Wei Tan
Keyword(s):  
Bearing Capacity ◽  
Seismic Performance ◽  
Rural Areas ◽  
Residential Buildings ◽  
Shear Capacity ◽  
Western China ◽  
Compressed Earth Blocks ◽  
Core Column ◽  
Earth Blocks ◽  
Energy Dissipation Capacity

At present, adobe houses with traditional characteristics are still widely used in rural areas in western China, but their seismic performance is relatively poor, and they often suffer serious damage under earthquake. To improve the seismic performance of traditional adobe buildings while retaining the characteristics of residential buildings, the mechanical properties of compressed earth blocks (CEB) were tested in this study, and the microstructure characteristics of CEB after failure were analyzed by electron microscope. On this basis, six adobe wall specimens were designed and tested by quasi-static loading to investigate the influence of core columns and different types of bricks on its seismic performance. The results show that the core column can improve the bearing capacity and shear capacity of hollow CEB, and it can also significantly increase the bearing capacity, energy dissipation capacity, and ductility of CEB wall. In general, the adobe wall with core columns shows excellent seismic performance, which can provide a new choice for improving the seismic performance of the adobe house.

Experimental study on the seismic performance of traditional timber mortise-tenon joints with different looseness under low-cyclic reversed loading

2018 ◽  
Vol 22 (6) ◽  
pp. 1312-1328 ◽  
Author(s):  
Jianyang Xue ◽  
Rui Guo ◽  
Liangjie Qi ◽  
Dan Xu
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Failure Modes ◽  
Artificial Defect ◽  
Reversed Loading ◽  
Energy Dissipation Capacity ◽  
Strength And Stiffness ◽  
Seismic Behaviors ◽  
Damage Type ◽  
Better Than

The majority of existing ancient timber structures have different degrees of damage. The looseness of mortise-tenon joints is a kind of typical damage type. In order to study the influence of looseness on the seismic performance of mortise-tenon joints, six through-tenon joints and six dovetail-tenon joints with scale 1:3.2 were fabricated according to the requirements of the engineering fabrication method of Chinese Qing Dynasty. Each type of joints consisted of one intact joint and five artificial loose joints, and the artificial defect was made to simulate looseness by cutting the tenon sectional dimension. Based on experiments of two types of joints under low-cyclic reversed loading, the seismic behaviors of joints such as failure modes, hysteretic loops and skeleton curves, strength and stiffness degradation, and energy dissipation capacity were studied. Moreover, the comparative analyses of seismic performance between two types of joints were carried out. The variation tendency of seismic behaviors of two types of joints has similarities, and there are some differences due to their different structural styles. The results indicate that squeeze deformation between tenon and mortise of two types of joints occurred. The shape of hysteretic loops of two types of joints is reverse-Z-shape, and the pinching effect of hysteretic loops becomes more obvious with the increase in looseness, among which of through-tenon joints is more obvious than that of dovetail-tenon joints. The carrying capacity, stiffness, and energy dissipation capacity of loose joints are significantly lower than that of the intact one, and the energy dissipation capacity of dovetail-tenon joints is better than that of through-tenon joints. The rotation angles of two types of joints can reach 0.12 rad, and the loose joints still have great deformation capacity.

Sign in / Sign up

Export Citation Format

Share Document