DESIGN AND PERFORMANCE OF HIGH-RISE STRUCTURE USING ULTRA-LIGHTWEIGHT CROSS LAMINATED TIMBER FLOOR SYSTEM

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Danish Ahmed ◽  
Tahar Ayadat ◽  
Andi Asiz
Keyword(s):  
Concrete Slab ◽  
Performance Criteria ◽  
Structural Performance ◽  
Lateral Loads ◽  
Reinforced Concrete Slab ◽  
Existing Building ◽  
Cross Laminated Timber ◽  
High Rise ◽  
Rc Slab ◽  
Floor System

The main objective of this paper is to study the structural performance of a high-rise structure when alternative lightweight material known as cross-laminated timber was used as a slab in floor system in lieu of conventional reinforced concrete slab. A numerical case study was conducted using a highly irregular RC frame building with its two 60-story towers joined at the top. Three major analyses were considered. First, modeling and analyzing the building with an RC slab was conducted to determine the design reference. Second, substituting the RC slab with the CLT slab was performed using the same building skeleton. Third, redesigning and optimizing the building skeleton with that CLT to observe skeleton material saving obtained using the same structural performance criteria. Major lateral loads applicable in the Eastern Province of Saudi Arabia were inputted. Strengths and serviceability requirements for floor diaphragm and lateral load resisting system were checked first before performing a comparative analysis between traditional RC and CLT slabs as floor diaphragm. The structural performance criteria to be used for comparative study between RC and CLT slabs included total drift, inter-story drift due to lateral loads, and base reactions. Structural periods and acceleration responses for each floor were investigated and contrasted with the existing building code. The foundation demand was also investigated based on the structural weight and reactions generated from the RC and CLT floor systems.

scholarly journals Assessment of CO2 Emissions by Replacing an Ordinary Reinforced Concrete Slab with the Void Slab System in a High-Rise Commercial Residential Complex Building in South Korea

2018 ◽  
Vol 11 (1) ◽  
pp. 82 ◽  
Author(s):  
Inkwan Paik ◽  
Seunguk Na ◽  
Seongho Yoon
Keyword(s):  
Reinforced Concrete ◽  
Co2 Emissions ◽  
Carbon Dioxide Emissions ◽  
Raw Materials ◽  
Concrete Slab ◽  
Lower Amount ◽  
Reinforced Concrete Slab ◽  
High Rise ◽  
Complex Building ◽  
Operation Phase

The purpose of this study is to verify the environmental performance of the novel Void Deck Slab (VDS) system developed by the authors. The proposed VDS is a void slab system with enhanced design features that improve the constructability of the system through the elimination of additional works required to connect the void formers with the anchoring devices. The Life Cycle Assessment (LCA) technique was adopted to assess the carbon dioxide emissions of the void slab system with reference to the ordinary reinforced concrete slab. The system boundary of this study ranged from raw materials to pre-operation phase, in accordance with ISO 14044. The total CO2 emissions of the ordinary reinforced concrete slab and the void slab system were 204,433.06 and 151,754.75 kg CO2-eq, respectively, which equated to about 34% less emissions for the void slab system. In the case of the ordinary reinforced concrete slab, moulds accounted for approximately 62% of CO2 emission, followed by concrete (~34%). The main source of CO2 emissions for the void slab system was concrete that accounted for ~50%, followed by moulds and deck plates that accounted for roughly 27% and 19%, respectively. In the case of the void slab system, void formers would enable a lower amount of concrete, as well as the self-weight of the slab. Besides, although the void formers filled a significant volume of the slab, the contribution to CO2 emissions was less than 1%.

scholarly journals Ultrasonic pitch and catch technique for non-destructive testing of reinforced concrete slabs

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Wael A. Zatar ◽  
Hai D. Nguyen ◽  
Hien M. Nghiem
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Point Contact ◽  
Test Method ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Reinforced Concrete Slab ◽  
Reinforced Concrete Slabs ◽  
Rc Slab ◽  
Non Destructive

Abstract This study aims at evaluating reinforced concrete (RC) bridge elements using ultrasonic pitch and catch (UPC) non-destructive testing (NDT) technique. A validation reinforced concrete slab with two embedded layers of rebars and artificial defects (voids, honeycombs, and debondings) was designed and tested. A commercial UPC NDT device (hereafter called “UPC device”), which is based on the ultrasonic shear-wave test method using dry-point-contact transmitting and receiving transducers in a “pitch-catch” configuration, was used to map internal defects of the validation RC slab. The recorded data from the UPC device was analyzed using a modified synthetic aperture focusing technique (SAFT). A software was developed to reconstruct 2-D images of the RC slab cross-sections using novel signal filtering and processing techniques. The results revealed that the 2-D image reconstructed from the developed software accurately exhibited locations and horizontal dimensions of the steel rebars, voids, and debondings. In addition, the developed software was capable to provide much higher resolution and sharper images of the anomalies inside the RC slab compared to the UPC device’s proprietary imaging software.

scholarly journals Analysis of the causes of damage to the RC floor slab in the underground garage

2019 ◽  
Vol 284 ◽  
pp. 06004
Author(s):  
Piotr Matysek ◽  
Michał Witkowski
Keyword(s):  
Concrete Slab ◽  
Technical Documentation ◽  
Synthetic Resin ◽  
Control Material ◽  
Reinforced Concrete Slab ◽  
Floor Slab ◽  
Entire Thickness ◽  
Rc Slab ◽  
Service Building ◽  
Material Tests

The article presents the results of testing a damaged reinforced concrete slab, which is located in the underground garage constituting the two lowest floors of a residential and service building. During the tests numerous cracks in the slab were inventoried. Some cracks covered the entire thickness of the RC slab and floor layers made of synthetic resin. The result of these damages was penetration through the slab of water from molten slush and the need to limit the parking places on the lower level of the garage. Conducted analysis of technical documentation, analysis of damage morphology, control material tests and structure computations allowed assessment of the causes of existing damages to the floor slab and ability to develop recommendations regarding the methods of its repair.

Behavior of Two-way RC Slabs Combination Strengthened with CFRP Strips and Steel Sheets

2014 ◽  
Vol 501-504 ◽  
pp. 1048-1052 ◽  
Author(s):  
Xiao Jin Li ◽  
Yi Yan Lu ◽  
Na Li
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Concrete Slabs ◽  
Test Results ◽  
Reinforced Concrete Slab ◽  
Steel Sheets ◽  
Reinforced Concrete Slabs ◽  
Rc Slab ◽  
Rc Slabs ◽  
Strengthening Technique

A total of four two-way reinforced concrete slabs strengthened with three methods were tested. The four test specimens were one unstrengthened reinforced concrete slab (control), one slab strengthened with CFRP strips, one slab strengthened with steel sheets, and one slab strengthened with an innovative method of applying CFRP strips and steel sheets combination bonding to the tension face of the slab. The test results show the CFRP-Steel combination strengthened technique is a rapid and effective strengthening technique for two-way RC slab. The increase in ultimate capacities of CFRP-Steel combination strengthened slab is 221.1% over the control slab, 84.4% over the CFRP-strengthened slab, and 45.2% over the steel-strengthened slab. In addition, the CFRP-Steel combination strengthened slab exhibited superior ductility than the CFRP-strengthened slab.

Structural Performance of Biaxial Geogrid Reinforced Concrete Slab

2021 ◽  
Author(s):  
K. RajeshKumar ◽  
P. O. Awoyera ◽  
G. Shyamala ◽  
Vinod Kumar ◽  
N. Gurumoorthy ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Slab ◽  
Structural Performance ◽  
Reinforced Concrete Slab

scholarly journals Improvement of a Truss-Reinforced, Half-Concrete Slab Floor System for Construction Sustainability

2021 ◽  
Vol 13 (7) ◽  
pp. 3731
Author(s):  
Jiarui Qi ◽  
Hsi-Chi Yang
Keyword(s):  
Concrete Slab ◽  
Experimental Tests ◽  
Construction Cost ◽  
Steel Tube ◽  
Structural Performance ◽  
Initial Stiffness ◽  
Component Design ◽  
Steel Bar ◽  
Component Form ◽  
Floor System

The truss-reinforced half-concrete slab has been widely used in prefabricated construction all over the world. It has become the most widely used prefabricated component form in China. However, its construction cost is higher than using the conventional construction method. To improve the half slab floor system, it is essential to have a comprehensive understanding of the truss-reinforced half slab’s structural performance over its complete loading history. Six experimental tests on such slabs were carried out. Three of them were reinforced with a steel bar truss (SBT) and the other three with a steel tube/bar truss (STBT). The steel tube in an STBT was grouted. The results show that when the specimen is damaged, the grouted steel tube does not undergo out-of-plane or in-plane buckling, and its force performance is good when compared to the steel bar in SBT. Compared with the SBT-reinforced slab specimens, the load characteristic values of the STBT-reinforced slabs were significantly improved, and the slabs had greater initial stiffness and resistance to deformation. Due to the fact that good structural performance of the steel tube was observed, after having studied the half slab component design, a dry, prefabricated, STBT-reinforced half slab system that can reduce the volume of concrete and amount of steel used in the present slab system is proposed. The proposed system has the advantages of allowing easier construction, cost reduction, and reuse of the components afterward to make the prefabrication construction more sustainable.

Seismic Behavior and Design of Innovative Modular Steel Floor System

2018 ◽  
Vol 763 ◽  
pp. 287-294
Author(s):  
Tony Y. Yang ◽  
Si Rou Zhuo ◽  
Yuan Jie Li
Keyword(s):  
Seismic Behavior ◽  
Lateral Loads ◽  
Modular Construction ◽  
Construction Time ◽  
High Rise ◽  
Fabrication Cost ◽  
The Past ◽  
Highly Efficient ◽  
Floor System

With increasing demands in high-rise constructions worldwide, developing a thinner steel floor system is becoming a crucial criterion in maximizing the useable and saleable spaces within a high-rise construction. This research aims to overcome the past drawbacks and develop an innovative and economical steel floor system that can be modularized and used within a modular construction. The proposed modular steel floor system can be fabricated offsite, shipped and assembled on site. This saves the construction time and fabrication cost. In this paper, the specially designed modular floor system was optimized for both gravity and lateral loads. The seismic performances of the proposed floor system are used in a 3-story prototype building. The results show that the proposed system is highly efficient in transferring the gravity and lateral loads which can be used effectively and efficiently for modular constructions worldwide.

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