scholarly journals Experimental Study on the In-Plane Seismic Performance of a New Type of Masonry Wall System

2020 ◽  
Vol 10 (24) ◽  
pp. 9102
Author(s):  
Ho Choi ◽  
Kang-Seok Lee
Keyword(s):  
Seismic Performance ◽  
Masonry Wall ◽  
Absorption Capacity ◽  
Height Difference ◽  
Failure Patterns ◽  
New Type ◽  
Key Block ◽  
Block Wall ◽  
Wall System ◽  
Joint Mortar

The authors developed two types of block systems consisting only of main block and key block without joint mortar to improve the seismic performances and to enhance the workability. Two types of block systems have different key block shapes: one is the peanut shape, and the other is the dumbbell shape. The proposed block systems have a half-height difference between the main block and the key block to significantly improve seismic performance compared to typical masonry walls with joint mortar. In this study, in order to evaluate the in-plane seismic performance of the proposed block systems, two types of block walls are experimentally investigated, including the typical block wall. In the tests, three full-scale, single-story specimens are tested under in-plane cyclic loading, and failure patterns and cracks are carefully observed. In this paper, the in-plane loading bearing capacity, energy dissipate capacity and reuse ratios of block walls are discussed in detail. As a result, the deformability, energy absorption capacity and reuse ratio of the proposed block systems were considerably higher than those of a typical block system.

scholarly journals Experimental Study on Out-of-Plane Seismic Performance of New Type Masonry System

2021 ◽  
Vol 11 (24) ◽  
pp. 11736
Author(s):  
Ho Choi ◽  
Kang-Seok Lee
Keyword(s):  
Seismic Performance ◽  
Masonry Wall ◽  
Shaking Table ◽  
Shaking Table Tests ◽  
Preliminary Calculation ◽  
Four Point Bending ◽  
Out Of Plane ◽  
New Type ◽  
Block Wall ◽  
Joint Mortar

The authors developed two types of block systems, consisting only of main and key blocks, without joint mortar, to improve the in- and out-of-plane seismic performances and enhance the workability. Two types of block systems have different key block shapes. One is the peanuts shape, and the other is the H shape. The proposed block systems have a half-height difference between the main and key blocks, to significantly improve seismic performance in in- and out-of-plane directions, compared to typical masonry wall with joint mortar. In this study, in order to evaluate the out-of-plane seismic performance of the proposed block systems, two types of block walls are experimentally investigated, including the typical block wall. Firstly, the shaking table tests are carried out to investigate the fundamental out-of-plane behaviors of three specimens. Next, four-point bending tests are planned to evaluate the out-of-plane seismic performance, since all specimens do not occur the out-of-plane collapse in the shaking table tests from the preliminary calculation. In this paper, the development of predominant period, profiles of acceleration and displacement, and maximum tensile strength of each specimen are discussed in detail. As a result, the maximum loads of the proposed block walls were about three to four times that of the typical block wall. This result means that the proposed block system has significantly improved seismic performance in the out-of-plane direction.

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

scholarly journals Seismic Performance of Masonry Walls Built with New Type of Fired Shale Hollow Blocks

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Jian Wu ◽  
Liangcheng Zeng ◽  
Bo Wang
Keyword(s):  
Energy Dissipation ◽  
Aspect Ratio ◽  
Bearing Capacity ◽  
Compressive Stress ◽  
Seismic Performance ◽  
Stiffness Degradation ◽  
Masonry Walls ◽  
Secant Stiffness ◽  
Hollow Block ◽  
New Type

This paper presents the cyclic loading test results of a new type of fired shale hollow block masonry walls. Six specimens were designed including two specimens without reinforcements (bare walls) and four specimens constrained by structural columns (reinforced walls). The influences of aspect ratio, vertical compressive stress, and structural column on the seismic performance of the specimens were investigated. The failure mode, bearing capacity, ductility, stiffness degradation, and energy dissipation of specimens were analyzed. The results showed that the crack patterns of specimens changed from the horizontal straight shape (bare walls) to “X” shape (reinforced walls), and the corresponding bearing capacity, ductility, stiffness degradation, and energy dissipation of the specimens were improved. With the increase of the vertical compressive stress, the ductility and the secant stiffness of the specimens increased. Moreover, with the decrease of aspect ratio, the bearing capacity and secant stiffness of the masonry walls increased, while the energy dissipation capacity decreased. This paper confirms that fired shale hollow block walls could meet the seismic requirements through appropriate design, which could promote the application of this new type of block in civil engineering.

scholarly journals Shake Table Response of Unreinforced Masonry and Reinforced Concrete Elements of Special Moment Resisting Frame

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Syed Azmat Ali Shah ◽  
Junaid Shah Khan ◽  
Syed Muhammad Ali ◽  
Khan Shahzada ◽  
Waqar Ahmad ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Masonry Wall ◽  
Masonry Walls ◽  
Shake Table ◽  
Base Excitation ◽  
Reinforced Concrete Frame ◽  
Infill Walls ◽  
Concrete Frame ◽  
Moment Resisting

Half-scaled reinforced concrete frame of two storeys and two bays with unreinforced masonry (URM) infill walls was subjected to base excitation on a shake table for seismic performance evaluation. Considering the high seismic hazard Zone IV of Pakistan, reinforcement detailing in the RC frame is provided according to special moment resisting frames (SMFRs) requirement of Building Code of Pakistan Seismic-Provisions (BCP SP-2007). The reinforced concrete frame was infilled with in-plane solid masonry walls in its interior frame, in-plane masonry walls with door and window openings in the exterior frame, out-of-plane solid masonry wall, and masonry wall with door and window openings in its interior frame. For seismic capacity qualification test, the structure was subjected to three runs of unidirectional base excitation with increasing intensity. For system identification, ambient-free vibration tests were performed at different stages of experiment. Seismic performance of brick masonry infill walls in reinforced concrete frame structures was evaluated. During the shake table test, performance of URM infill walls was satisfactory until design ground acceleration was 0.40g with a global drift of 0.23%. The test was continued till 1.24g of base acceleration. This paper presents key findings from the shake table tests, including the qualitative damage observations and quantitative force-displacement, and hysteretic response of the test specimen at different levels of excitation. Experimental results of this test will serve as a benchmark for validation of numerical and analytical models.

Application of Special Shaped Column Composed of Concrete-Filled Steel Tubes

2010 ◽  
Vol 163-167 ◽  
pp. 196-199 ◽  
Author(s):  
Zhi Hua Chen ◽  
Ting Zhou ◽  
Xiao Dun Wang
Keyword(s):  
Finite Element ◽  
Seismic Performance ◽  
3D Model ◽  
Residential Building ◽  
Type Structure ◽  
Steel Tubes ◽  
Finite Element Procedure ◽  
New Type ◽  
Vertical Stiffener ◽  
Concrete Filled Steel Tubes

Special-shaped column composed of concrete-filled steel tubes (SCFT) structure, a new type structure, is adopted to a residential building. This paper represents the design and analysis of this structure. 3D model of the structure is built by finite element procedure software and vibration property, static and seismic performance of the building are also analyzed to check the safety of the structure. At last, the vertical stiffener joint of SCFT structure is proposed and calculated. The application of SCFT for residential building represents that the SCFT is suitable for real constructions.

Study on Seismic Performance of Offshore Platform with Rocking Wall - TMD System

2014 ◽  
Vol 610 ◽  
pp. 78-83
Author(s):  
Ji Gang Zhang ◽  
Zhi Wei Jiang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Seismic Performance ◽  
Tuned Mass Damper ◽  
Offshore Platform ◽  
Element Analysis ◽  
Mass Damper ◽  
Jacket Offshore Platform ◽  
Rocking Wall ◽  
Wall System

Offshore platform rocking wall system and tuned mass damper are briefly introduced, and the paper integrates the advantages of these two kinds of seismic method, and the TMD is attached to the jacket offshore platform - rocking wall system, using the ANSYS for finite element analysis, and the analysis results are optimized. The results show that compared with the offshore platform - rocking wall system, additional TMD can give full play to the performances of the two kinds of seismic methods, which is remarkable.

Empirical Cellular Automata Model to Predict Failure Patterns of Laterally Loaded Masonry Wall Panel

2014 ◽  
Vol 1020 ◽  
pp. 314-316
Author(s):  
Deng Pan ◽  
Cheng Zhi Qi ◽  
Jian Luo
Keyword(s):  
Cellular Automata ◽  
Masonry Wall ◽  
Parameter Analysis ◽  
Variation Coefficient ◽  
Wall Panel ◽  
Improve Performance ◽  
Relative Variation ◽  
Cellular Automata Model ◽  
Failure Patterns ◽  
Laterally Loaded

This paper proposed an empirical relative variation coefficient to improve performance of cellular automata model which was put forward by Zhou[1] to predict failure patterns of masonry wall panels under lateral load. The improved empirical cellular automata model could take discreteness of failure patterns into account. Then, parameter analysis of the empirical variation coefficient was conducted to find out its reasonable value interval. Consequently, a serial failure patterns could be predicted on the basis of each experimental record. A comparison between predicted failure patterns and experimental results has been made, which proved the empirical cellular model with relative variation coefficient was not only one-to-multiple, but also valid.

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