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.

Performance of Reinforced Concrete Beams with Multiple Openings

2020 ◽  
Vol 857 ◽  
pp. 162-168
Author(s):  
Haidar Abdul Wahid Khalaf ◽  
Amer Farouk Izzet
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Load ◽  
Concrete Beams ◽  
Load Capacity ◽  
Reinforced Concrete Beams ◽  
Design Parameters ◽  
Ultimate Load Capacity ◽  
Concentrated Load ◽  
Simply Supported ◽  
Group I

The present investigation focuses on the response of simply supported reinforced concrete rectangular-section beams with multiple openings of different sizes, numbers, and geometrical configurations. The advantages of the reinforcement concrete beams with multiple opening are mainly, practical benefit including decreasing the floor heights due to passage of the utilities through the beam rather than the passage beneath it, and constructional benefit that includes the reduction of the self-weight of structure resulting due to the reduction of the dead load that achieves economic design. To optimize beam self-weight with its ultimate resistance capacity, ten reinforced concrete beams having a length, width, and depth of 2700, 100, and 400 mm, respectively were fabricated and tested as simply supported beams under one incremental concentrated load at mid-span until failure. The design parameters were the configuration and size of openings. Three main groups categorized experimental beams comprise the same area of openings and steel reinforcement details but differ in configurations. Three different shapes of openings were considered, mainly, rectangular, parallelogram, and circular. The experimental results indicate that, the beams with circular openings more efficient than the other configurations in ultimate load capacity and beams stiffness whereas, the beams with parallelogram openings were better than the beams with rectangular openings. Commonly, it was observed that the reduction in ultimate load capacity, for beams of group I, II, and III compared to the reference solid beam ranged between (75 to 93%), (65 to 93%), and (70 to 79%) respectively.

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 Experimental analysis of eccentrically loaded reinforced concrete columns with an added jacket of self-compacting concrete

2019 ◽  
Vol 12 (2) ◽  
pp. 329-336
Author(s):  
J. P. VIRGENS ◽  
R. B. GOMES ◽  
L. M. TRAUTWEIN ◽  
G. N. GUIMARÃES ◽  
A. P. R. VAZ
Keyword(s):  
Reinforced Concrete ◽  
Cross Section ◽  
Ultimate Load ◽  
Load Capacity ◽  
Concrete Columns ◽  
Reinforce Concrete ◽  
Self Compacting Concrete ◽  
Ultimate Load Capacity ◽  
Reinforced Concrete Columns ◽  
Concrete Layer

Abstract This paper presents the experimental study of eccentrically loaded reinforced concrete columns with an added 35 mm self-compacting concrete jacket attached to the column’s most compressed face using wedge bolts. Nine columns with a 2000 mm height were tested under compression and one-way bending until failure. Columns were denominated as original column (PO) with a cross section of 120 mm x 250 mm; reference column (PR) with a cross section of 155 mm x 250 mm, and seven columns with an initial cross section of 120 mm x 250 mm and later reinforced by the addition of 35 mm self-compacting concrete layer and various configurations of wedge bolts. Except for the original column PO, the columns were submitted to a 42.5 mm load eccentricity due to the added concrete layer at the compressed face. Although failure of the wedge bolts did not occur, it was not possible to prevent detachment of the added layer. The results indicate that it is possible to structurally rehabilitate reinforce concrete columns with the use of the strengthening methodology used in this research, resulting in average ultimate load capacity gains of 271% compared to original column’s ultimate load.

Effect of anchorage number and CFRP strips length on behavior of strengthened glulam timber beam for flexural loading

2021 ◽  
pp. 136943322098862
Author(s):  
Ümmü Karagöz İşleyen ◽  
Rahim Ghoroubi ◽  
Ömer Mercimek ◽  
Özgür Anıl ◽  
Abdullah Togay ◽  
...  
Keyword(s):  
Energy Dissipation ◽  
Ultimate Load ◽  
Load Capacity ◽  
Timber Beam ◽  
Initial Stiffness ◽  
Ultimate Load Capacity ◽  
Displacement Ductility ◽  
Flexural Loading ◽  
Bonding Length ◽  
Wooden Structures

Laminated wooden beams are more preferred in the production of wooden structures than solid timber beams because they have a higher load-carrying capacity and allow larger openings to be used in the structure. The widespread use of wooden structures and the increasing size of the structures have revealed the need for strengthened laminated wooden beams and increase their ultimate load capacity. It has become necessary to develop reinforcement details to increase the ultimate load capacity of laminated wooden beams in wooden railroads or highway bridge beams, where the traffic load increases, especially in large wooden structures, in cases where large openings must be passed. Within the horizon of the study, the behavior and performance of three-layer glulam wooden beams strengthened with anchorage and non-anchorage CFRP strips with different bonding length under flexural loading were investigated experimentally. The three-point bending test was applied to glulam timber beam test specimens produced by laminating yellow pine wood material using the polyurethane adhesive. General load-displacement behaviors, ultimate load capacity, initial stiffness, displacement ductility ratios, and energy dissipation capacities were obtained. The increase in the bonding length of the CFRP strips used for strengthening in the glulam timber beam specimens and the use of CFRP fan type anchors at the strip ends increased the ultimate load capacity and initial stiffness values of the wooden beams, as well as the displacement ductility ratios and energy dissipation capacity values.

scholarly journals BEHAVIOR OF STEEL PLATE-CONCRETE COMPOSITE SHEAR WALL UNDER CYCLIC LOADING

2021 ◽  
Vol 11 (4) ◽  
pp. 292-310
Author(s):  
Tadele Ergete Tadesse ◽  
Temesgen Wondimu Aure
Keyword(s):  
Energy Dissipation ◽  
Steel Plate ◽  
Load Capacity ◽  
Concrete Strength ◽  
Shear Wall ◽  
Steel Grade ◽  
Composite Shear Wall ◽  
Ductility Factor ◽  
Energy Dissipation Capacity ◽  
Composite Shear

Steel-Concrete composite shear wall has become popular recently as it compensates for the disadvantages of concrete and steel plate shear walls and combine the advantage of both. However, there is no detail study that identifies the most critical parameters. This study aims at investigation of steel plate-concrete composite shear wall behavior under cyclic loading with variables such as concrete strength, grade of steel plate, total number of tie constraints and thickness of steel plate. ABAQUS/Standard is used for numerical modeling in this study. As the concrete strength decreases from 86.1Mpa to 45Mpa, the load capacity declined by 11.76% and higher stiffness was recorded in specimen with higher grade of concrete. The ductility factor is inversely proportional to grade of concrete from 86.1Mpa to 60Mpa which increases from 4.26 to 4.68 and the ductility factor of specimen with 45Mpa strength is recorded as 3.81. The energy dissipation capacity is directly proportional to the grade of concrete used. Using high grade steel plate increases the lateral load capacity significantly and exhibited more ductile behavior. Specimen with S355 steel grade exhibited 14.01% increment of the average load capacity while the specimen with S245 steel grade has shown reduction by 9.21%. Similarly, the ductility factor and energy dissipation capacity of specimen with variable grade of steel are directly proportional. Reduction of tie constraints has no significant effect on the behavior in this study due to high confinement effect of concrete by surrounding steel plate. Specimens with thicker steel plate exhibited good energy dissipation capacity.

The Experimental Study on the Size Effects of Reinforced Concrete Members with Eccentrical Compression

2012 ◽  
Vol 166-169 ◽  
pp. 1793-1796
Author(s):  
Fan Feng ◽  
Jun Zhao ◽  
Aizhen Lu
Keyword(s):  
Reinforced Concrete ◽  
Size Effects ◽  
Strain Distribution ◽  
Ultimate Load ◽  
Load Capacity ◽  
Plane Section ◽  
Ultimate Load Capacity ◽  
Cross Sectional ◽  
Concrete Members ◽  
Better Than

The size effects of reinforced concrete members with eccentrical compression are experimentally studied, using two sizes of specimens which side lengths of cross-section are 200mm and 400mm, respectively, under the conditions in which e0/h0=0.6. It shows that, with the increase of the size of the specimen, the ultimate load capacity of the specimen decreases, relative to the calculated values; cross-sectional strain distribution of smaller specimens matches plane-section assumption better than larger-sized specimen’s.

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