Shear Strength Upgrade of Perforated RC Shearwalls Using Prestress and Steel Plate

2011 ◽  
Vol 194-196 ◽  
pp. 1896-1899
Author(s):  
Chang Sik Choi ◽  
Baek Il Bae ◽  
Hyun Ki Choi ◽  
Il Sung Park
Keyword(s):  
Ultimate Load ◽  
Steel Plate ◽  
Load Capacity ◽  
Shear Walls ◽  
Shear Capacity ◽  
Construction Site ◽  
Housing Area ◽  
Ductile Behavior ◽  
Environmentally Friendly Approach ◽  
Partial Damage

Remodeling is also an environmentally-friendly approach that reduces the amount of waste in construction site. Specifically, there are many attempts to make house more wide according to the merging of two old houses in apartment buildings. For making two houses into single housing area, openings shoud be needed or walls should be removed. However, removing shearwalls are very dangerous attempt because of reducing of lateral load capacity of buildings. Therefore many engineers prefer to leave shearwalls. However, there are insufficient studies about partial damage, that is, openings. In these cases the damaged shear walls need to be retrofitted by additional materials or members. In this research, four specimens were tested to investigate the capacity of the damaged wall and the retrofitted wall. The artificially damaged wall was prestressed by tendons to improve the shear capacity of the wall, and the other walls were retrofitted by adding steel plate at the surface for the same purpose. Consequently, these retrofitted walls had improved capacity and stiffness in both shear and flexure. Especially, the wall with steel plate showed ductile behavior after ultimate load and the prestressed wall had greater stiffness than the unstrengthened prototype wall.

scholarly journals Hysteretic Assessment of Steel-Concrete Composite Shear Walls

2019 ◽  
Vol 8 (2) ◽  
pp. 5640-5645
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Experimental Test ◽  
Ultimate Load ◽  
Steel Plate ◽  
Load Capacity ◽  
Plate Thickness ◽  
Shear Walls ◽  
Ultimate Load Capacity ◽  
Composite Shear

This paper focuses on the hysteretic assessment of steel-concrete composite shear walls with reinforced concrete on one side of the steel plate. Finite element software ABAQUS is utilised to conduct this research. An experimental test on a composite shear wall is simulated to do the verification of the modelling. Then, modelling result is compared with the experimental test result which shows an insignificant difference between them and therefore uncovers the accuracy of the modelling. Thereafter, different parameters are considered to investigate their effects on the response of the walls. Thickness of reinforced concrete, steel plate thickness, and number of shear studs are studied as parameters. It is concluded that changing reinforced concrete thickness and number of shear studs do not considerably affect the ultimate load capacity, ductility, and energy dissipation of the walls. However, increasing the steel plate thickness enhances the ultimate load capacity, ductility, and energy dissipation. In addition, out-of-plane displacement of the walls is evaluated.

scholarly journals Experimental Investigation of Steel Plate Shear Walls under Shear-Compression Interaction

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Yang Lv ◽  
Ling Li ◽  
Di Wu ◽  
Bo Zhong ◽  
Yu Chen ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Steel Plate ◽  
Axial Stress ◽  
Shear Walls ◽  
Shear Capacity ◽  
Steel Plate Shear Walls ◽  
Steel Plate Shear Wall ◽  
Gravity Load ◽  
Moment Resisting ◽  
Axial Stress Distribution

Four scaled one-storey single-bay steel plate shear wall (SPSW) specimens with unstiffened panels were tested to determine their behaviour under cyclic loadings. The shear walls had moment-resisting beam-to-column connections. Four different vertical loads, i.e., 300 kN, 600 kN, 900 kN, and 1200 kN, representing the gravity load of the upper storeys were applied at the top of the boundary columns through a force distribution beam. A horizontal cyclic load was then applied at the top of the specimens. The specimen behaviour, envelope curves, axial stress distribution of the infill steel plate, and shear capacity were analyzed. The axial stress distribution and envelope curves were compared with the values predicted using an analytical model available in the literature.

scholarly journals Column Stiffness Requirements for Diagonally Stiffened Steel Plate Shear Walls

2020 ◽  
Vol 9 (5) ◽  
pp. 101-109
Keyword(s):  
Aspect Ratio ◽  
Steel Plate ◽  
Numerical Models ◽  
Shear Walls ◽  
Shear Capacity ◽  
Thickness Ratio ◽  
Steel Plate Shear Wall ◽  
Out Of Plane ◽  
The Impact ◽  
Stiffened Steel

Various numerical models of diagonally stiffened steel plate shear wall were tested under push-over loads to study the required stiffness of columns of diagonally stiffened SPSWs. This research presents a parametric study to explore the influence of varying the infill panel’s thickness, width, and height and the number of floors on the stiffness of the edge columns, and to propose expressions to predict the column’s in-plane stiffness and area required for preliminary design. Different SPSWs were modeled with a range of several stories, an aspect ratio, and height to thickness ratio, respectively, of (n=3-7), (Lp /hp=1-2), and (λ=200-400). The results indicated that the number of floors (n) has a great effect on the wall’s shear capacity. A greater number of floors lead to buckling in columns and early failure of the system, and subsequently, an increase in the column’s rigidity is required. Moreover, an equation is proposed to calculate the value of ωh required for sufficient inertia of the column. Higher the drift is, lower the shear capacity of the wall is, particularly for walls with a larger aspect ratio (Lp /hp > 1.5), and smaller height to thickness ratio (λ < 400). It is proposed that the columns’ out-of-plane stiffness divided by its in-plane stiffness to be equal or greater than 0.4. An equation is also proposed to predict the required columns’ rx substantial to assure that the columns can resist the impact of the tension field and the plate achieves full yield strength.

The shear capacity assessment of steel plate shear walls with peripheral circular holes

2021 ◽  
Vol 163 ◽  
pp. 107638
Author(s):  
Hadi Valizadeh ◽  
Bahman Farahmand Azar ◽  
Hedayat Veladi ◽  
Mohammad Reza Sheidaii
Keyword(s):  
Steel Plate ◽  
Shear Walls ◽  
Shear Capacity ◽  
Capacity Assessment ◽  
Steel Plate Shear Walls ◽  
Circular Holes

scholarly journals STRUCTURAL CAPACITY OF NSM STEEL BARS STRENGTHENED DEEP BEAMS UNDER COMBINED LOADS OF REPEATED AND ELEVATED TEMPERATURE

2021 ◽  
Vol 25 (6) ◽  
pp. 91-102
Author(s):  
Aula H. Faeq ◽  
◽  
Ali H. Aziz ◽  
Keyword(s):  
Elevated Temperature ◽  
Ultimate Load ◽  
Load Capacity ◽  
Shear Capacity ◽  
Deep Beams ◽  
Ultimate Load Capacity ◽  
Near Surface ◽  
Combined Loads ◽  
Structural Capacity ◽  
Steel Bars

The current experimental investigation is devoted to study the structural capacity of near-surface mounted steel bars strengthened deep beams. Six reinforced SCC deep beam specimens with a dimension of 1400mm x175mm x350mm were tested under Combined Loads of Repeated and Elevated Temperature. The adopted variable includes the type of loading, degree of elevated temperature, and presence or absence of the strengthening by NSM-steel bars. The experimental results show that the ultimate load of B2-R-T20 decreased by about 33% when the applied load changed from monotonic to repeated; also, when the degree of burning increased to (200oC) and (350oC), the ultimate load decreased by 44% and 65% , respectively. The presence of the strengthened NSM-steel bars leads to increase the lateral strength of the tested beams and arrested the diagonal cracks to be widening as a result, the ultimate load capacity increases by (193%-197%) for the samples exposed to elevated temperature, in comparison with reference beams. The adopted strengthened technique proved to be adequate to restore and increase the shear capacity of the tested beams.

Test Research on the Performance of Wood Frame Shear Walls under Lateral Load

2011 ◽  
Vol 71-78 ◽  
pp. 3764-3768
Author(s):  
Yan Liu ◽  
Chen Gang She ◽  
Xiao Jin Zou
Keyword(s):  
Energy Dissipation ◽  
Axial Force ◽  
Ultimate Load ◽  
Load Capacity ◽  
Shear Walls ◽  
Lateral Load ◽  
Initial Stiffness ◽  
Full Size ◽  
Displacement Energy ◽  
Wood Frame

Sixteen full-size single-storey shear walls 6.0 m in length and 2.44 m in height were tested: half with a flexible and half with a rigid load spreader. In addition, four full-size shear walls representing a typical two-storey configuration were tested. Comparisons of the initial stiffness, ultimate load and displacement, energy dissipation and axial force in anchor bolts of the test walls are presented. An increase of lateral load capacity due to rigid load spreader beam and from a second storey has been confirmed.

Experiment Study on Compressive Membrane Action of Slab Strips Restrained by Shear Walls

2009 ◽  
Vol 417-418 ◽  
pp. 805-808
Author(s):  
Qing Xiang Wang ◽  
Gang Wang ◽  
Zhong Jun Li
Keyword(s):  
Ultimate Load ◽  
Load Capacity ◽  
Shear Walls ◽  
Lateral Force ◽  
Membrane Action ◽  
Ultimate Load Capacity ◽  
Previous Hypothesis ◽  
Rc Slab ◽  
Lateral Restraint ◽  
Compressive Membrane Action

Subjecting to the compressive membrane action (CMA), the ultimate load capacity of the reinforced concrete (RC) slab with lateral restraint would be improved obviously. Test of 12 one-way slab specimens restrained by shear-walls was carried out to investigate the properties of the slab strips’ compressive membrane action. The reduced-size specimens were designed to keep the ratios of shear-walls’ restraint stiffness to slab strips’ flexural stiffness unchanged. One horizontal testing instrument was first used to record the development of the slabs’ lateral restraint forces. The ultimate loads of slab strips with certain lateral restraint stiffness gave an average 38.3% rise from the calculations of upper-bound method. Though the increment of slab’s ultimate load was due to the additional moment formed by the lateral restraint force, the results showed that the peak of lateral force lagged of the slab strips’ ultimate load, which was different from the previous hypothesis. Various parameters which affect the development of CMA were also investigated, such as the shear-wall’s thickness, axial load on the walls, the slab strips’ span-height ratio and reinforcement percentage.

scholarly journals Shear Strengthening of Composite Steel-Concrete Girders with Web Openings Using CFRP Sheets

2018 ◽  
Vol 7 (4.20) ◽  
pp. 443
Author(s):  
Wael Shawky AbdulSahib ◽  
Mohammed J. Hamood ◽  
Ahmed Mohammed Majeed
Keyword(s):  
Ultimate Load ◽  
Concrete Slab ◽  
Load Capacity ◽  
Point Load ◽  
Shear Capacity ◽  
Ultimate Shear Strength ◽  
Ultimate Load Capacity ◽  
Web Openings ◽  
Concrete Girders ◽  
Composite Steel

This study presents an experimental investigation of subjecting one-point load at mid-span of five composite steel-concrete girders that are loaded predominantly in shear. Three of girders are reference girders with no web openings, square web openings, and circular web openings, respectively. The both other girders are strengthened girders. The compressive strength of concrete, slab reinforcement and all dimensions of girders are kept. The CFRP laminates were adhesively attached to the webs of strengthened girders in various patterns and were done to estimate the effect of strengthening scheme by CFRP composite on increasing of the ultimate load capacity of the web openings girders. The research purposes to examine the behavior and effect of increasing in the ultimate shear capacity of strengthened girders that have constant dimensions and locations of web openings which is about 40 % of web depth. The results show the increase in ultimate load capacity of strengthened girders containing square and circular web openings with about 23.75% and 25.9%, respectively compared to that of reference girders. Furthermore, the ultimate shear strength was predicted by von Mises stresses were used for girders without and with square and circular web openings.  

The Effects of Applied Axial Stress on Lateral Bearing-Load Capacity for Fully Grouted Reinforced Concrete Masonry Shear Walls

2012 ◽  
Vol 166-169 ◽  
pp. 2900-2905
Author(s):  
Y. Zhao ◽  
Feng Lai Wang ◽  
Fei Zhu
Keyword(s):  
Failure Modes ◽  
Shear Failure ◽  
Ultimate Load ◽  
Load Capacity ◽  
Axial Stress ◽  
Shear Walls ◽  
Initial Crack ◽  
Flexural Failure ◽  
Concrete Masonry ◽  
Bearing Load

Ten full-scale fully grouted reinforced concrete masonry shear walls were tested under force-displacement controlled reversed cyclic lateral loads simulating seismic effects. Relevant experimental phenomena and data indicated four walls failing in shear failure and the other six walls failing in flexure to evaluate seismic performance under compress, flexure and shear combined action. The paper mainly examinates lateral bearing-load capacity through two parameters: initial crack and ultimate strength under different failure modes. Through experimental analysis it can be concluded that the shear strength at the initial crack and ultimate load improved with the increased applied axial stress, and the increment of the shear strength was different in shear failure and flexural failure modes. Meanwhile, the ratio of the initial crack load to ultimate load on shear mechanism was from 0.57 to0.59,which was more stable than that(from 0.52 to 0.66)on flexural mechanism. In other words, the applied axial stress have more significant influence on flexural failure walls than shear ones.

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