scholarly journals Type door rigid frame - pile arch system characteristics and disaster prevention application in thermodynamics

2019 ◽  
Vol 23 (5 Part A) ◽  
pp. 2749-2755
Author(s):  
Yong Wang
Keyword(s):  
Reinforced Concrete ◽  
High Strength ◽  
Force Transmission ◽  
Soil Arching ◽  
Rigid Frame ◽  
Overall Stability ◽  
Arch System ◽  
New Type ◽  
System Characteristics ◽  
Sliding Force

The construction of mountain roads often promotes the occurrence of landslides, and poses a serious threat to the safety of driving and the geological environment. This paper introduces a new type of road landslide area anti-sliding structure based on thermal factors. The type door rigid frame-pile arch system, it is mainly composed of three parts: the gate type anti-slide pile, the reinforced concrete arch plate, and the mouth shaped guard pier. Its characteristics are: door-type anti-slide pile role is to resist the landslide thrust and the main road as a support structure; reinforced concrete arch between the plate as the door-type anti-slide pile and pile retaining force transmission member, active play arch structure compression high strength, can change the mechanical properties of stress paths, so that the lateral landslide sliding force to reduce; shaped mouth guard pier to control the deformation and solid slope, and enhance the overall stability of the system. The FLAC3D simulation results show that the stress distribution of arch plate is more uniform, with the increase of the sliding force, the stress in the arch foot and the lower part of the arch plate increases rapidly, which accords with the principle of soil arching. At the same time, the contact beam gradually works, The landslide thrust is transmitted to the front row of piles. The stress of the rear row of piles increases more than that of the front row of piles. The stress of the upper part of the beam increases more than that of the lower part of the beam. The overall trend is more and more gentle.

Application and Research of High-Strength Steel Fiber Reinforced Concrete in a Project

2011 ◽  
Vol 261-263 ◽  
pp. 436-440 ◽  
Author(s):  
Xiao Fei Zhu ◽  
Da Wei Lv
Keyword(s):  
Reinforced Concrete ◽  
High Strength Steel ◽  
Structural Engineering ◽  
Steel Fiber ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Construction Process ◽  
Fiber Reinforced ◽  
Steel Fiber Reinforced Concrete ◽  
New Type

The application of steel fiber reinforced concrete as a new type of structural material, has unique advantages and wide application prospects. A special structural engineering, the use of high strength steel fiber reinforced concrete, to explore this technology for the construction of a key node in the construction process to elaborate.

scholarly journals Design and Testing of Various Ceiling Elements Made of Carbon Reinforced Concrete

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 543 ◽  
Author(s):  
Alexander Schumann ◽  
Sebastian May ◽  
Manfred Curbach
Keyword(s):  
Composite Material ◽  
Reinforced Concrete ◽  
Large Scale ◽  
Precast Concrete ◽  
High Strength ◽  
Research Project ◽  
Steel Reinforced Concrete ◽  
New Type ◽  
Improved Design ◽  
Design And Testing

In this paper the design and recalculation of new type ceiling elements made of carbon reinforced concrete (CRC) is described. With the use of the high-potential composite material carbon reinforced concrete, structures can be, compared to conventional steel reinforced concrete (RC), designed and manufactured slimmer and lighter. Because of this and the increased sustainability of ceiling elements made of CRC a noteworthy amount of concrete can be saved. To show the potential of CRC elements, four different structures for various fields of application are shown. The first ceiling element, which will be introduced, fits perfectly for the use in multi-storey car parks because of the high resistance of the carbon fibers against corrosion. Another CRC structure in this paper was created in a research project as a demonstrator to show the potential of the newly developed concrete mixture for CRC. To prove the ability of this new developed concrete, large-scale CRC I-beams were produced in a precast concrete factory. The third ceiling element was designed and manufactured in form of a shell to combine the high strength composite material with an improved design for ceiling elements. The last introduced CRC element was developed as demonstrator in another research project and was designed in form of a ribbed slab.

Design of precast reinforced concrete structures of frame buildings: a new set of rules

2019 ◽  
pp. 4-9 ◽  
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Reinforced Concrete Structures ◽  
Building Frames ◽  
Fine Grained ◽  
Rigid Frame ◽  
Floor Slabs ◽  
Frame Buildings ◽  
Spatial System ◽  
Precast Elements

Currently, prefabricated reinforced concrete structures are widely used for the construction of buildings of various functional purposes. In this regard, has been developed SP 356.1325800.2017 "Frame Reinforced Concrete Prefabricated Structures of Multi-Storey Buildings. Design Rules", which establishes requirements for the calculation and design of precast reinforced concrete structures of frame buildings of heavy, fine-grained and lightweight structural concrete for buildings with a height of not more than 75 m. The structure of the set of rules consists of eight sections and one annex. The document reviewed covers the design of multi-story framed beam structural systems, the elements of which are connected in a spatial system with rigid (partially compliant) or hinged joints and concreting of the joints between the surfaces of the abutting precast elements. The classification of structural schemes of building frames, which according to the method of accommodation of horizontal loads are divided into bracing, rigid frame bracing and framework, is presented. The list of structural elements, such as foundations, columns, crossbars, ribbed and hollow floor slabs and coatings, stiffness elements and external enclosing structures is given; detailed instructions for their design are provided. The scope of the developed set of rules includes all natural and climatic zones of the Russian Federation, except seismic areas with 7 or more points, as well as permafrost zones.

scholarly journals Resistance of an Optimized Ultra-High Performance Fiber Reinforced Concrete to Projectile Impact

Buildings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 63
Author(s):  
Anna L. Mina ◽  
Michael F. Petrou ◽  
Konstantinos G. Trezos
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
Fiber Reinforced ◽  
Depth Of Penetration ◽  
Projectile Impact ◽  
High Performance Fiber

The scope of this paper is to investigate the performance of ultra-high performance fiber reinforced concrete (UHPFRC) concrete slabs, under projectile impact. Mixture performance under impact loading was examined using bullets with 7.62 mm diameter and initial velocity 800 m/s. The UHPFRC, used in this study, consists of a combination of steel fibers of two lengths: 6 mm and 13 mm with the same diameter of 0.16 mm. Six composition mixtures were tested, four UHPFRC, one ultra-high performance concrete (UHPC), without steel fibers, and high strength concrete (HSC). Slabs with thicknesses of 15, 30, 50, and 70 mm were produced and subjected to real shotgun fire in the field. Penetration depth, material volume loss, and crater diameter were measured and analyzed. The test results show that the mixture with a combination of 3% 6 mm and 3% of 13 mm length of steel fibers exhibited the best resistance to projectile impact and only the slabs with 15 mm thickness had perforation. Empirical models that predict the depth of penetration were compared with the experimental results. This material can be used as an overlay to buildings or to construct small precast structures.

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