scholarly journals Structural Performance and Reinforcement Improvement of Structural Walls Using Strain-Hardening Cementitious Composites

2021 ◽  
Vol 13 (7) ◽  
pp. 3607
Author(s):  
Hyeong-Ki Kim ◽  
Chang-Geun Cho ◽  
Sun-Ju Lee ◽  
Young Hak Lee ◽  
Taehoon Kim
Keyword(s):  
Strain Hardening ◽  
Shear Walls ◽  
Mechanical Tests ◽  
Structural Performance ◽  
Cementitious Composites ◽  
Structural Walls ◽  
Damage And Failure ◽  
Load Carrying ◽  
Loading Tests ◽  
Rc Shear Wall

Reinforced concrete (RC) shear walls are effective in improving lateral stiffness and load-carrying capacity under earthquake and wind loads. According to the level of seismic design, however, the spacing of reinforcing steel bars should be very narrow and complicated, with tight spacing of tied bars, as is the case with seismically special RC shear wall design. The purpose of this study was to investigate the applicability of strain-hardening cementitious composites (SHCCs) in structural walls in order to improve structural performance as well as the complications with reinforcement details. The SHCC was mixed, and mechanical tests showed that the SHCC exhibited high ductile tensile strains above 2.0%, while sustaining the tensile stress after cracks and developing multiple microcracks, avoiding crack localizations. Six specimens of RC and reinforced SHCC structural walls were designed and manufactured with varying reinforcement details, and experiments on wall specimens were carried out under transverse wall-loading tests. These experiments demonstrated that the use of SHCC in structural walls, despite minimum use of reinforcement ratios, showed improved responses to minimize damage and failure caused by localized cracks under bending and shear to compared with the use of normal reinforcement ratios in RC walls.

scholarly journals Development of an Innovative Modular Foam-Filled Panelized System for Rapidly Assembled Postdisaster Housing

Buildings ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 97 ◽  
Author(s):  
P. Sharafi ◽  
S. Nemati ◽  
B. Samali ◽  
M. Ghodrat
Keyword(s):  
Sandwich Panel ◽  
High Density ◽  
Building Construction ◽  
Structural Performance ◽  
Modular Construction ◽  
Structural Walls ◽  
Pu Foam ◽  
Load Carrying ◽  
Foam Filled ◽  
American Society

In this paper, the development process of a deployable modular sandwich panelized system for rapid-assembly building construction is presented, and its structural performance under some different action effects is investigated. This system, which includes an innovative sandwich panel and its integrated connections, can be used as structural walls and floors in quickly-assembled postdisaster housing, as well as load-bearing panels for prefabricated modular construction and semipermanent buildings. Panels and connections are composed of a pneumatic fabric formwork, and two 3D high-density polyethylene (HDPE) sheets as the skins, filled with high-density rigid polyurethane (PU) foam as the core. HDPE sheets manufactured with a studded surface considerably enhance stress distribution, buckling performance, and delamination strength of the sandwich panel under various loading conditions. The load-carrying behavior of the system in accordance with some American Society for Testing and Materials (ASTM) standards is presented here. The results show the system satisfies the codes’ criteria regarding semipermanent housing.

Seismic Damage Characteristics of RC Shear Wall with Diagonal Profile Steel Braces by Experiment

2007 ◽  
Vol 340-341 ◽  
pp. 1115-1120
Author(s):  
Shi Yun Xiao ◽  
Hong Nan Li ◽  
Yan Gang Zhao ◽  
Jing Wei Zhang
Keyword(s):  
Mechanical Model ◽  
Shear Walls ◽  
Shear Wall ◽  
Seismic Damage ◽  
Cyclic Loads ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Different Types ◽  
Rc Shear Wall ◽  
Theoretical Results

This paper focuses on an experimental investigation and theoretical analysis of different types of RC shear wall with the profile steel braces in two side columns and diagonal profile steel braces of walls subjected to applied repeated cyclic loads. Fifteen RC shear walls with different shear span ratio are tested and their aseismic charactertics are studied. The effect of profile steel bracings on failure property, bearing capacity, ductility and hysteretical characteristic of shear wall is investigated based on experimental results. It is shown that adding the profile steel braces on the boundary column and inner of walls can obviously enhance the ultimate strength of specimens and improve their aseismic characteristics. Finally, the mechanical model of the shear wall is presented and the formulae for calculating the load-carrying capacity are developed. Numerical analyses indicate that the theoretical results agree well with those from experiments.

scholarly journals Development of an Innovative Modular Foam-Filled Panelised System for Rapidly Assembled Post Disaster Housing

2018 ◽  
Author(s):  
Pezhman Sharafi ◽  
Saeed Nemati ◽  
Bijan Samali ◽  
Maryam Ghodrat
Keyword(s):  
Sandwich Panel ◽  
High Density ◽  
Structural Performance ◽  
Modular Construction ◽  
Structural Walls ◽  
Permanent Housing ◽  
Pu Foam ◽  
Load Carrying ◽  
Foam Filled ◽  
Post Disaster

In this paper the development process of a deployable modular sandwich panelized system for rapid assembly building construction is presented, and its structural performance under some different action effects is investigated. This system, which includes an innovative sandwich panel and its integrated connections, can be used as structural walls and floors in quickly assembled post-disaster housing, as well as load bearing panels for pre-fabricated modular construction and semi-permanent buildings. Panels and connections are composed of a pneumatic fabric formwork, and two 3-D high-density polyethylene (HDPE) sheets as the skins, filled with high-density rigid Polyurethane (PU) foam as the core. HDPE sheets manufactured with a studded surface considerably enhance the stress distribution, buckling performance and delamination strength of the sandwich panel under various loading conditions. The load-carrying behaviour of the system in accordance with some ASTM standards is presented here. The results show the system satisfies the codes criteria regarding semi-permanent housing.

scholarly journals Mechanical Behavior of Printed Strain Hardening Cementitious Composites

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2253
Author(s):  
Stefan Chaves Figueiredo ◽  
Claudia Romero Rodríguez ◽  
Zeeshan Y. Ahmed ◽  
Derk H. Bos ◽  
Yading Xu ◽  
...  
Keyword(s):  
Strain Hardening ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Cementitious Materials ◽  
Mechanical Tests ◽  
Cementitious Composites ◽  
Multiple Cracks ◽  
Micro Computed Tomography ◽  
Engineering Strain ◽  
Strain Hardening Behavior

Extrusion based additive manufacturing of cementitious materials has demonstrated strong potential to become widely used in the construction industry. However, the use of this technique in practice is conditioned by a feasible solution to implement reinforcement in such automated process. One of the most successful ductile materials in civil engineering, strain hardening cementitious composites (SHCC) have a high potential to be employed for three-dimensional printing. The match between the tailored brittle matrix and ductility of the fibres enables these composites to develop multiple cracks when loaded under tension. Using previously developed mixtures, this study investigates the physical and mechanical performance of printed SHCC. The anisotropic behavior of the materials is explored by means of mechanical tests in several directions and micro computed tomography tests. The results demonstrated a composite showing strain hardening behavior in two directions explained by the fibre orientation found in the printed elements. Moreover, the printing technique used also has guaranteed an enhanced bond in between the printed layers.

Experimental Study and Theoretical Analysis on Seismic Performance of RC Shear Wall with STRC Columns and Embedded Steel Plate

2012 ◽  
Vol 446-449 ◽  
pp. 1006-1013 ◽  
Author(s):  
Wan Lin Cao ◽  
Hong Ying Dong ◽  
Jian Wei Zhang
Keyword(s):  
Seismic Performance ◽  
Carrying Capacity ◽  
Steel Plate ◽  
Shear Walls ◽  
Shear Wall ◽  
Load Carrying Capacity ◽  
Load Carrying ◽  
Rc Shear Wall ◽  
Composite Shear ◽  
Steel Trusses

RC shear wall with STRC (steel tube-reinforced concrete) columns and embedded steel plate has been proposed and used in the project of an International Conference Center. In order to ascertain the seismic performance of this kind of composite shear walls with different openings in the practical engineering, four 1/7 scale specimens with shear span ration 2.0 were tested under low-frequency cyclic loading. The load-carrying capacity, ductility, stiffness and its attenuation, hysteretic property, energy dissipation capacity and failure mode of the specimens were analyzed. The effect of the embedded steel plate and the concealed steel trusses on the seismic performance of the walls was studied. The results show that the ductility and load-carrying capacity of RC shear wall are improved greatly by setting the embedded steel plate or concealed steel trusses in the wall; The embedded steel plate and the concrete work very well through the stud connectors welded on the steel plate and the tie bars inserted in the walls; The STRC columns have the advantage of higher load-carrying capacity, not easy to crack and better ductility; The new composite shear wall has good seismic performance and important practical value. It is suitable for large and complex application of high-rise buildings in the seismic regions.

Seismic Performance of RC Shear Walls with Concealed Bracing

2003 ◽  
Vol 6 (1) ◽  
pp. 1-13 ◽  
Author(s):  
W. L. Cao ◽  
S. D. Xue ◽  
J. W. Zhang
Keyword(s):  
Seismic Performance ◽  
Carrying Capacity ◽  
Shear Walls ◽  
Shear Wall ◽  
Hysteretic Behavior ◽  
Load Carrying Capacity ◽  
Building Structures ◽  
Load Carrying ◽  
New Type ◽  
Rc Shear Wall

Reinforced concrete shear walls play an important role in improving seismic performance of building structures. In this paper, a new type of RC shear wall with concealed bracing is proposed and investigated. Four 1:3 scale medium-height specimens were designed and a detailed experimental investigation carried out. The load-carrying capacity, stiffness, ductility, hysteretic behavior and energy dissipation of the shear wall are discussed. The failure mechanism was revealed by the experiments. It is found that in comparison with a normal shear wall, the seismic performance of a shear wall can be significantly improved by adding concealed bracing within the wall panel. Finally, a mechanical model of the shear wall is proposed and formulae for calculating load-carrying capacity developed. It is shown that the theoretical results agree well with those from experiments.

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.

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