Flexural Behaviour of Reinforced Slab Panel System with Embedded Cold-formed Steel Frames as Reinforcement

2015 ◽  
Vol 74 (4) ◽  
Author(s):  
Cher Siang Tan ◽  
Yee Ling Lee ◽  
Shahrin Mohammad ◽  
Siong Kang Lim ◽  
Yeong Huei Lee ◽  
...  
Keyword(s):  
Concrete Slab ◽  
Load Capacity ◽  
Precast Concrete ◽  
Steel Frames ◽  
Control Sample ◽  
Steel Frame ◽  
Ultimate Load Capacity ◽  
Hollow Section ◽  
Average Value ◽  
Cold Formed Steel

This paper presents the experimental investigation on flexural characteristic of slab panels with embedded cold-formed steel frame as reinforcement. Perforated cold-formed steel channel sections are formed into steel frames as replacement to the conventional reinforcement bars inside precast concrete slab panels. A series of six experimental specimens for precast slab panels were tested. The specimens with 3 configurations namely control sample (CS) with conventional reinforcement bars, single horizontal C-channel section (SH) and double horizontal C-channel sections (DH) formed into rectangular hollow section. Results show that the tested slab specimens failed at the flexural crack at mid-span, under loading point and shear at the support. Tearing of shear connector in the cold-formed steel section was found to be the main factor for the structural failure. SH specimens achieved the highest ultimate load capacity, with average value of 138.5 kN, followed by DH specimens, 116.5 kN, and the control samples, 59.0 kN. The results showed that the proposed reinforced slab panel with embedded cold-formed steel frame was more effective compared to conventional reinforced slab.

scholarly journals A Numerical Investigation on the Structural Behavior of Deficient Steel Frames Strengthened using CFRP Composite

2018 ◽  
Vol 20 (1) ◽  
pp. 1 ◽  
Author(s):  
Amir Hamzah Keykha
Keyword(s):  
Numerical Study ◽  
Load Capacity ◽  
Steel Frames ◽  
Steel Structures ◽  
Independent Study ◽  
Fiber Reinforced Polymers ◽  
Structural Behavior ◽  
Ultimate Load Capacity ◽  
Hollow Section ◽  
Cfrp Composite

Carbon fiber reinforced polymers (CFRP) is one of the materials that is used to strengthen steel structures. Most studies on CFRP strengthening steel on structures have been done on beams and steel columns. No independent study has studied the effect of CFRP strengthening on the structural behavior of steel frames having initial deficiency.The deficiency in steel structures may be created due to the errors caused by construction and others.This study aims to carry out a numerical study on the efficiency of CFRP sheet on strengthening square hollow section (SHS) steel frames having initial deficiency. Seven specimens, five of which were strengthened using CFRP sheets, were analyzed. ANSYS software was used to analyze the SHS steel frames. The results showed that the coverage length, the width, and the number of CFRP layers have a significant effect on increasing and recovering the ultimate load capacity of the SHS steel frames having initial deficiency.

scholarly journals Experimental Study on the Effect of Heel Plate Length on the Structural Integrity of Cold-formed Steel Roof Trusses

2018 ◽  
Vol 65 ◽  
pp. 08010
Author(s):  
Je Chenn Gan ◽  
Jee Hock Lim ◽  
Siong Kang Lim ◽  
Horng Sheng Lin
Keyword(s):  
Ultimate Load ◽  
Structural Integrity ◽  
Load Capacity ◽  
Local Buckling ◽  
Ultimate Capacity ◽  
Ultimate Load Capacity ◽  
Plate Length ◽  
Roof Truss ◽  
Cold Formed Steel ◽  
Structural Failures

Applications of Cold-Formed Steel (CFS) are widely used in buildings, machinery and etc. Many researchers began the research of CFS as a roof truss system. It is required to increase the knowledge of the configurations of CFS roof trusses due to the uncertainty of the structural failures regarding the materials and rigidity of joints. The objective of this research is to investigate the effect of heel plate length to the ultimate load capacity of CFS roof truss system. Three different lengths of heel plate specimens were fabricated and subjected to concentrated loads until failure. The highest ultimate capacity for the experiment was 30 kN. The results showed that the increment of the length of the heel plate had slightly increased the ultimate capacity and strain. The increment of the length of the heel plate had increased the deflection of the bottom chords but decreased the deflection of the top chords. Local buckling of top chords adjacent to the heel plate was the primary failure mode for all the heel plate specimens.

Web Buckling and Ultimate Strength of Composite Plate Girders Subjected to Shear and Bending

2015 ◽  
Vol 15 (02) ◽  
pp. 1450047 ◽  
Author(s):  
Aliakbar Hayatdavoodi ◽  
Nandivaram Elumalai Shanmugam
Keyword(s):  
Composite Plate ◽  
Shear Failure ◽  
Ultimate Load ◽  
Concrete Slab ◽  
Load Capacity ◽  
Ultimate Load Capacity ◽  
Design Strength ◽  
Plate Girders ◽  
The Moment ◽  
Plate Girder

The paper is concerned with ultimate load behavior of steel–concrete composite plate girders subjected to combined action of shear and bending. An analytical method is presented to predict the interactive response of the girder. The method considers the tension field action in the plate girder web panel and shear failure of concrete slab. The method is approximate and can be applied to composite plate girders at the preliminary stages of design. Strength of composite plate girders is investigated by varying the moment/shear ratio. It is shown that ultimate load capacity of composite plate girder is influenced by moment/shear ratio. The predicted results are compared with the corresponding finite-element values.

Effective Steel Area of Fully Embedded Cold-Formed Steel Frame in Composite Slab System under Pure Bending

2013 ◽  
Vol 284-287 ◽  
pp. 1300-1304 ◽  
Author(s):  
Yee Ling Lee ◽  
Cher Siang Tan ◽  
Yeong Huei Lee ◽  
Shahrin Mohammad ◽  
M.Md. Tahir ◽  
...  
Keyword(s):  
Precast Concrete ◽  
Analytical Calculation ◽  
Steel Frame ◽  
Cross Sectional Area ◽  
Industrial Building ◽  
Sectional Area ◽  
Cross Sectional ◽  
Composite Slab ◽  
Strength Capacity ◽  
Cold Formed Steel

In conjunction with the promote of Industrial Building System (IBS) in Malaysia building construction, precast units such as slab, beam and column were widely used. This paper reports on the determination of the effective cross sectional area of the proposed cold-formed sections that embedded in precast concrete slab. The cold-formed steel sections are single and double lipped channel section, with 100mm in depth, 50 mm width, 12 mm lips length and 1.55 mm thickness. In order to determine the flexural capacity of the composite slab system, it is necessary to identify the effective cross sectional area of the section contributes to load-carrying of the slab system. The calculation method was based on the effective width method concept from BS EN 1993-1-3 and BS EN 1993-1-5. Four types of cold-formed steel frame profiles that embedded in the concrete to form a new type of composite slab system were used to study in this paper. The four types of cold-formed steel section configuration are S1-SV, S2-SH, S3-DV and S4-DH. From the analytical calculation, S3-DV has the highest effective cross-sectional area, which it only consists of 2% ineffective area for load-carry capacity. Besides that, single lipped section S2-SH fully utilized the cross sectional in carrying load. It can be concluded that S3-DV is predicted to have highest bending resistance than other three types of configuration with condition that the reliability of the prediction need to verify as other factors such as shear bonding and shifted neutral axis happened due to combination of concrete and cold-formed section which, will also contribute the strength capacity of the composite slab system.

Rehabilitation of Tappan Zee Bridge Using Precast Concrete Composite Deck Units

2000 ◽  
Vol 1696 (1) ◽  
pp. 63-72
Author(s):  
Richard N. White ◽  
Peter Smith
Keyword(s):  
Bridge Deck ◽  
Lightweight Concrete ◽  
Concrete Slab ◽  
Load Capacity ◽  
Precast Concrete ◽  
Fatigue Loading ◽  
Hudson River ◽  
Load Level ◽  
Experimental Program ◽  
Specific Reference

The criteria used for successful rehabilitation of decks of major bridges when it is not feasible to close the bridge to traffic are described. These criteria are described with specific reference to recent work on the trestle spans of the Tappan Zee Bridge over the Hudson River near New York City. The results of an experimental program conducted with a full-scale, 10-m-span, lightweight concrete slab-steel beam composite bridge deck unit intended for later use in rehabilitating the through-truss decks of the bridge are also described. Loading history included 107 cycles of flexural fatigue loading followed by a flexural load capacity test. Measured values of capacity and midspan deflection at this ultimate load level are compared with simplified analytical predictions. A description of the actual rehabilitation process used on the Tappan Zee Bridge deck is also provided.

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.  

scholarly journals Experimental Behavior of the Curved Continuous Twin I-Girder Composite Bridge with a Precast Concrete Slab Subjected to Bending, Shear, and Torsion

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Chuandong Shen ◽  
Yifan Song ◽  
Lei Yan ◽  
Yuan Li ◽  
Xueli Wang ◽  
...  
Keyword(s):  
Failure Mode ◽  
Concrete Slab ◽  
Load Capacity ◽  
Precast Concrete ◽  
Plastic Hinge ◽  
Local Buckling ◽  
Design Load ◽  
Symmetric Point ◽  
Bridge Model ◽  
Composite Bridge

In order to investigate the mechanical behavior, ultimate load carrying capacity, and failure mode of the intact curved continuous twin I-girder composite bridge (TGCB) with a precast concrete slab, one curved continuous composite bridge model with a scale ratio of 1 : 5 of a prototype bridge was designed and manufactured considering the influence of the construction sequence. Four symmetric point loads’ test was carried out. In this paper, load-deflection relationship and strain development of steel girders, concrete slab, and reinforcement at key sections were tested and analyzed. Failure mode, crack development, and major crack width at the top surface of the concrete slab in the hogging moment region were also reported. The experimental results demonstrated that the load capacity under the initial cracking level, cracking level with the width of 0.2 mm, and steel girder yielding state is about 1.7, 5.0, and 6.3 times of the design load, respectively. Due to the influence of curvature, the stiffness of the external girder is less than that of the internal girder. However, the ultimate bearing capacity is basically the same, approximately 13.6 times of the design load. During the loading process, plastic hinge was first observed at the intermediate support section as a result of the hogging moment which should be emphasized in design. The local buckling took place after yielding, indicating a class 2 section according to Eurocode 4. In addition, the TGCB had good ductility since the displacement ductility coefficients of the external and internal girders were 4.40 and 4.06, respectively.

scholarly journals The Effect of Butt Joint on the Structural Behaviour of PSSDB Wall Panel

2007 ◽  
Vol 4 (1) ◽  
pp. 27
Author(s):  
Siti Hawa Hamzah ◽  
Chua Bon Yong ◽  
Nadiah Saari@Ash’ari ◽  
Mat Som Marwi
Keyword(s):  
Load Capacity ◽  
Compressive Load ◽  
Butt Joint ◽  
Structural Behaviour ◽  
Ultimate Load Capacity ◽  
Load Bearing ◽  
Average Value ◽  
Average Maximum ◽  
Significant Difference ◽  
Window Opening

An experimental investigation was carried out to determine the effect of butt joint on the structural behaviour of profiled steel sheet dry board (PSSDB) load bearing wall with window opening. The samples tested were three (3) PSSDB walls with window opening and butt joint in the dry boards, and three (3) PSSDB walls with window opening but without butt joint in the dry boards. The samples were subjected to axial compressive load and comparisons were made between the two sets of samples. The average value of the ultimate load capacity for PSSDB load bearing wall with butt joint was found to be 286 kN, while that for the samples of PSSDB load bearing wall without butt joint was 260 kN. The average maximum lateral deflection values for both types of PSSDB walls were 8.9 mm and 13 mm respectively. Significant difference due to butt joint in dry board was seen in the reduced number of cracks by about 33 % in comparison to that without butt joint.

scholarly journals Performance of Hollow Core Concrete Slab reinforced by embedded steel tubes

2019 ◽  
Vol 26 (4) ◽  
pp. 17-21
Author(s):  
Yousif Dhari Awad ◽  
Ali Hussein Ali Al-Ahmed
Keyword(s):  
Cross Section ◽  
Concrete Slab ◽  
Load Capacity ◽  
Concrete Slabs ◽  
Total Width ◽  
Horizontal Distance ◽  
Hollow Core ◽  
Steel Tubes ◽  
Ultimate Load Capacity ◽  
Core Concrete

The aims of this paper are gaining additive knowledge about using steel tubes as reinforcement for hollow-core concrete slabs. For this purpose, this paper presents an investigation of how one-way concrete slabs would behave after embedding steel tubes within the cross section. Five concrete slabs were cast, these specimens differ from one another in the horizontal distance (spacing) between the two steel tubes placed within its cross section, steel tubes positioned in the center of the shorter lane of the specimen (width) which is 400 mm, the steel tubes spaced from each other with 4 different configurations, they were 0, 100, 200 and 300 mm. The ratio of the clear spacing between the two tubes and to the total width of the specimen is indicated (s/b) equal to (0, 0.25, 0.5 and 0.75). In addition to one solid slab cast and tested as a reference for the testing results. All five concrete slabs were loaded up to failure by submitting load at one point at the center of the slab. Only one variable was deemed to be considered and checked on this study which is the (s/b) ratio defined earlier. The results exhibit that, using steel tubes as reinforcement increase the first crack load by 12.75% compared to the reference slab, as well as increasing the ultimate load capacity by 59.02% compared to the reference slab. As for the mid-span deflection, the specimens with steel tubes embedded decreased the deflection values up to 47.37 %.

Sign in / Sign up

Export Citation Format

Share Document