Retrofit of Artificially Perforated Shear Wall in Existing Dominant Wall Structure

2007 ◽  
Vol 348-349 ◽  
pp. 917-920
Author(s):  
Chang Sik Choi ◽  
Yun Cheul Choi ◽  
Hyun Ki Choi ◽  
M.S. Lee
Keyword(s):  
Carbon Fiber ◽  
Axial Stress ◽  
Shear Wall ◽  
Seismic Retrofit ◽  
Lateral Loading ◽  
The Other ◽  
Steel Plates ◽  
Wall Structure ◽  
Test Results ◽  
Different Types

A series of three shear wall specimens were tested under constant axial stress and reversed cyclical lateral loading in order to evaluate the seismic retrofit that had been proposed for the shear wall with the opening induced by remodeling. One of these specimens was tested in the as-built condition and the other two were retrofitted prior to testing. The retrofit involved the use of carbon fiber sheets and steel plates (a thickness of 3mm) over the entire face of the wall. The test results showed that the failed specimens had shear fractures and that two different types of retrofitting strategies had different effects on the strengths of each specimen.

A Study on Retrofit Methods of Shear Walls with New Openings

2008 ◽  
Vol 385-387 ◽  
pp. 861-864
Author(s):  
Hyun Ki Choi ◽  
J.A. Lee ◽  
M.S. Lee ◽  
Yun Cheul Choi ◽  
Chang Sik Choi
Keyword(s):  
Cyclic Loading ◽  
Axial Stress ◽  
Shear Walls ◽  
Shear Wall ◽  
Seismic Retrofit ◽  
Test Results

A series of five shear wall specimens were tested under constant axial stress and reversed lateral cyclic loading in order to evaluate the seismic retrofit methods that had been proposed for shear walls with new openings. The test results showed that the failed specimens had shear fractures and two different retrofit methods had different effects on the strengths of each specimen.

Analysis to Earthquake Resistant Behavior of Composite Steel Plate Shear Wall Based on ABAQUS Software

2013 ◽  
Vol 423-426 ◽  
pp. 1506-1510
Author(s):  
De Jian Yang ◽  
Zong Chen
Keyword(s):  
Shear Walls ◽  
Shear Wall ◽  
Calculation Model ◽  
Steel Plates ◽  
Wall Structure ◽  
Steel Plate Shear Wall ◽  
Finite Element Software ◽  
Test Models ◽  
Transverse Steel ◽  
Composite Shear

The structural system and seismic performance of the composite shear wall are analyzed based on the horizontal load model tests. The test models are three groups of combined shear walls with shear span of 1.5, including an ordinary shear wall, a shear wall with vertical steel plates and a shear wall with transverse steel plates. The finite element software ABAQUS is used to build the calculation model of the shear wall structure. And the analysis the influence of steel plates to bearing capacity, ductility, and stiffness of shear wall are carried out. The research results indicate that the combination shear wall has good seismic behaviors.

scholarly journals Zanieczyszczenie świetlne. Zagrożenia i sposoby jego ograniczania

2020 ◽  
Vol 6 ◽  
pp. 254-266
Author(s):  
Krzysztof Sala
Keyword(s):  
Data Analysis ◽  
Literary Criticism ◽  
Radioactive Contamination ◽  
Natural Environment ◽  
Research Method ◽  
The Other ◽  
Light Pollution ◽  
Test Results ◽  
Different Types ◽  
Existing Data

Threats Related to Light Pollution and Ways to Reduce it The natural environment can be exposed to many different types of pollution. The most frequently mentioned are air, water, soil and radioactive contamination. On the other hand, light pollution is mentioned much less frequently. Light pollution only applies to light from artificial sources. It turns out that light, in addition to its undisputable advantages and colossal significance for life, in some cases can be associated with significant threats. The purpose and premise of this publication is to show that light pollution involves a considerable threat to the natural environment, including animals and humans. However, there are ways to effectively limit this phenomenon. The paper discusses the concept of light pollution, its sources, forms and division. Particular attention has been devoted to the characterisation of the threats that it brings with regard to the natural environment, including humans. The publication also reveals examples of actions to reduce this harmful phenomenon. The article has been created using book materials, magazines, as well as information available online. The research method used in the publication is existing data analysis and literary criticism. The test results verify the premise positively.

Tilt Response of Multi-Storey Building of Different Types due to Progressive Collapse of the Adjacent Underground Structure under Internal Blast Loading

2012 ◽  
Vol 226-228 ◽  
pp. 1023-1028
Author(s):  
Li Tian ◽  
Hai Xian Song
Keyword(s):  
Progressive Collapse ◽  
Underground Structure ◽  
Blast Loading ◽  
Simulation Method ◽  
Shear Wall ◽  
Wall Structure ◽  
Ground Structure ◽  
Different Types ◽  
Internal Blast Loading ◽  
Tilt Response

This paper numerically investigates the tilt response of multi-storey buildings due to progressive collapse of the adjacent underground structure under internal blast loading. The software LS-DYNA is utilized to establish a three-dimensional coupled model composed of the underground structure, the soil around and the adjacent above-ground structure. In order to reduce the computational cost, an efficient computational method, Three-Stage Simulation Method (TSSM), is put forward. Three different methods, Alternative Path Load Method (APLM), Direct Simulation Method (DSM) and TSSM, are used to analyze the same model which illustrates the correctness of the model and the proposed method. By comparing tilt response of the above-ground structure of different types due to progressive collapse of underground structure under its internal blast loading, it is found that the tilt response of the above-ground structure of different types is related to the foundation of the structure. For example, compared with the frame structure with basement, the frame-shear wall structure with basement can prevent structure from great tilt response. However, the tilt response of the frame-shear wall structure with raft basis is larger than that of the frame.

Shaking Table Test of RC Frame-Shear Wall Structures with Partial Columns Sliding at Upper Ends

2013 ◽  
Vol 405-408 ◽  
pp. 795-798
Author(s):  
Wen Long Lu ◽  
Chao Yong Shen
Keyword(s):  
Shear Force ◽  
Shaking Table Test ◽  
Shear Wall ◽  
Shaking Table ◽  
Wall Structure ◽  
Rc Frame ◽  
Structure Model ◽  
Test Results ◽  
Wall Structures ◽  
Member Size

A new kind of RC frame-shear wall structures with partial columns sliding at upper ends is proposed in this paper. A shaking table test of this new kind of structure model (Model B) and a conventional frame shear-wall structure Model (Model A) were carried out, and the plan layout and the member size of the two models are nearly identical. The two models are 3-story and 2-bay by 2-bay, and the second story of either structure is weak story. The test results showed that: (1) under the same intense earthquake, the damage of Model B is slighter than that of Model A; and (2) under the same intense earthquake, the interstory drift angle, the acceleration and the shear force of weak story of Model B are reduced remarkably in comparison to Model A.

scholarly journals Seismic Performance of Existing RC Structural Walls Retrofitted in Flexure by Wall End Plate

2021 ◽  
Vol 13 (2) ◽  
pp. 509
Author(s):  
Su-Yong Kim ◽  
Uijin Cho ◽  
Joo-Hong Chung ◽  
Baek-Il Bae ◽  
Chang-Sik Choi
Keyword(s):  
Shear Wall ◽  
Steel Plates ◽  
Wall Structure ◽  
Lateral Loads ◽  
Apartment House ◽  
Structural Walls ◽  
Flexural Performance ◽  
Rc Structural Walls ◽  
Rc Shear Wall ◽  
Real Scale

A study was conducted for the flexural retrofit of an old apartment house composed of a reinforced concrete (RC) shear wall structure. For the shear wall, a vertical retrofit was performed to both ends of the wall targeting the slender wall to improve the flexural performance. The retrofit materials were steel plate, epoxy, and non-shrink grout, and they were connected to the existing shear wall using post-installed chemical anchors. The concrete at the wall ends was broken and retrofitted as much as necessary to maintain the shear wall’s length. The points to be noted are the fracture of the welded part of the flexural retrofit and the chemical anchor’s pulling. After the real scale specimen was fabricated by simulating the existing shear wall, the retrofit effect was experimentally verified by breaking the wall ends, retrofitting the ends, and applying repeated cyclic lateral loads. A total of three specimens were fabricated and retrofitted using steel plates and steel tubes. Since this experiment evaluated the flexural performance, the experiment was performed with a cantilever setting. The flexural retrofit effect using steel was analyzed through the load–displacement relationship, stiffness degradation, and energy dissipation, and through this, the bond of the retrofit and the behavior of the wall were verified.

Retrofit Using Increased Section Area Method of Artificially Perforated Shear Wall in Existing Wall Dominant Structure

2006 ◽  
Vol 324-325 ◽  
pp. 639-642
Author(s):  
Chang Sik Choi ◽  
Yun Cheul Choi ◽  
Hyun Do Yun
Keyword(s):  
High Performance ◽  
Axial Stress ◽  
Shear Wall ◽  
High Pressure Pump ◽  
Section Area ◽  
Different Types ◽  
High Performance Fiber ◽  
Dominant Structure ◽  
Fiber Reinforced Cementitious Composites ◽  
Strength And Ductility

The characteristics relating to high tensile ductility, High Performance Fiber Reinforced Cementitious Composites (HPFRCC) are being so that studied it’ll be adopted in repair and retrofit of buildings. A series of three shear wall specimens were tested under constant axial stress and reversed cyclical lateral loading in order to evaluate the seismic retrofit that had been proposed for the shear wall with the opening. The retrofit involved the use of ECC and MDF, both of which are sprayed through the high pressure pump, over the entire face of the wall. The results indicate that two different types of retrofitting strategies cause the different effects on the strength and ductility of each specimen.

Adding an expansive agent to increase the toughness of steel fibre reinforced concrete

2019 ◽  
Vol 26 (4) ◽  
pp. 197-208
Author(s):  
Leo Gu Li ◽  
Albert Kwok Hung Kwan
Keyword(s):  
Reinforced Concrete ◽  
Steel Fibre ◽  
The Other ◽  
Fibre Reinforced Concrete ◽  
Test Results ◽  
Compressive Properties ◽  
Shrinkage Cracking ◽  
Steel Fibre Reinforced Concrete ◽  
Expansive Agent ◽  
Concrete Matrix

Previous research studies have indicated that using fibres to improve crack resistance and applying expansive agent (EA) to compensate shrinkage are both effective methods to mitigate shrinkage cracking of concrete, and the additions of both fibres and EA can enhance the other performance attributes of concrete. In this study, an EA was added to fibre reinforced concrete (FRC) to produce concrete mixes with various water/binder (W/B) ratios, steel fibre (SF) contents and EA contents for testing of their workability and compressive properties. The test results showed that adding EA would slightly increase the superplasticiser (SP) demand and decrease the compressive strength, Young’s modulus and Poisson’s ratio, but significantly improve the toughness and specific toughness of the steel FRC produced. Such improvement in toughness may be attributed to the pre-stress of the concrete matrix and the confinement effect of the SFs due to the expansion of the concrete and the restraint of the SFs against such expansion.

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.

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