Bearing Capacity And Deformations When Bending The Multi-Hollow Floor Slab With Stops At The Ends (In Order Of Discussion)

2020 ◽  
pp. 26-36
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Software Systems ◽  
Vertical Load ◽  
Hollow Core ◽  
Floor Slab ◽  
Finite Element Calculations ◽  
The Russian Federation ◽  
Full Scale Tests ◽  
Thrust Forces

Prefabricated multi-hollow-core slabs in precast-monolithic floors are placed in dense groups and persisted their ends in bearing beams. Various studies show that in the plane of such a floor under the action of a vertical load both along and across the slabs arise reactive thrust forces. They noticeably extinguish the load-induced forces in the sections of the slabs. This is accompanied by an increase in the bearing capacity and stiffness of the floors. But taking into account the spacer forces under modeling conditions in finite element calculations of software systems is difficult and requires additional research. By results of full-scale tests and the analysis conducted by the authors, it is established that due to the support of a multi-hollow floor slab with persisted on end faces along its axis under loading the longitudinal reactive rebuff is formed. Proposals are made to estimate its magnitude at various stages of the slabs operation up to its destruction. To ensure flat ceilings of precast-monolithic overlap, the case of supporting the plate on concrete dowels of load-bearing crossbars placed in the cavities of the plate is also considered. Based on the norms of the Russian Federation, the strength of key support units is estimated.

scholarly journals Mechanical Properties of Concrete Pipes with Pre-Existing Cracks

2020 ◽  
Vol 10 (4) ◽  
pp. 1545
Author(s):  
Zongyuan Zhang ◽  
Hongyuan Fang ◽  
Bin Li ◽  
Fuming Wang
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Bearing Capacity ◽  
Three Dimensional ◽  
Compressive Load ◽  
Full Scale ◽  
Element Analysis ◽  
Concrete Pipes ◽  
Concrete Pipe ◽  
Full Scale Tests

Concrete pipes are the most widely used municipal drainage pipes in China. When concrete pipes fall into years of disrepair, numerous problems appear. As one of the most common problems of concrete pipes, cracks impact on the deterioration of mechanical properties of pipes, which cannot be ignored. In the current work, normal concrete pipes and those with pre-existing cracks are tested on a full scale under an external compressive load. The effects of the length, depth, and location of cracks on the bearing capacity and mechanical properties of the concrete pipes are quantitatively analyzed. Based on the full-scale tests, three-dimensional finite element models of normal and cracked concrete pipes are developed, and the measured results are compared with the data of the finite element analysis. It is clear that the test measurements are in good agreement with the simulation results; the bearing capacity of a concrete pipe is inversely proportional to the length and depth of the crack, and the maximum circumferential strain of the pipe occurs at the location of the crack. The strain of the concrete pipe also reveals three stages of elasticity, plasticity, and failure as the external load rises. Finally, when the load series reaches the limit of the failure load of the concrete pipe with pre-existing cracks, the pipe breaks along the crack position.

Bearing Capacity of Beams with Sinusoidal Corrugated Webs with Round and Square Holes

2019 ◽  
pp. 11-17
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Theoretical Calculations ◽  
Steel Structures ◽  
Steel Beams ◽  
Design Standards ◽  
Method Of Calculation ◽  
Corrugated Webs ◽  
The Stability ◽  
Full Scale Tests

Steel beams with sinusoidal corrugated webs are known since the middle of the last century. Their bearing capacity is widely studied, the design rules of these beams are included in the existing regulations, such as "Standards European Committee for Standardisation (CEN): DIN EN 1993:2007-02, Eurocode 3: Bemessung und Konstruktion von Stahlbauten - Teil 1-5: Aus Blechen zusammengesetzte Bauteile", SNiP RK 5.04-23-2002 "Steel Structures. Design Standards." and SP 16.13330.2017 "SNiP II-23-81* Steel Structures". However, there is still an open question about the bearing capacity of sinusoidal corrugated webs of beams with holes bordered with steel sleeves to ensure the stability of the wall. In this paper, a method for calculating beams with sinusoidal corrugated webs, weakened by round and square holes, which are bordered by pipes is proposed. To develop this method of calculation a numerical experiment was conducted. A number of finite element models of such beams with varying web thickness, beam length, diameter and hole location were created and analyzed using the finite element method. ABAQUS computer complex was used for calculations. The result of the research conducted is a technique that makes it possible to determine the bearing capacity of sinusoidal corrugated webs of beams with round and square holes, bordered by pipes. To confirm the theoretical calculations, full-scale tests were carried out.

Study on Seismic Performance of C105 Prestressed High Strength Concrete Hollow Pipe Pile

2020 ◽  
Vol 980 ◽  
pp. 282-290
Author(s):  
Shi Meng Wang ◽  
Xin Sheng Yin
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Prestressed Concrete ◽  
High Strength Concrete ◽  
High Strength ◽  
Vertical Load ◽  
Vertical Pressure ◽  
Pipe Pile ◽  
Strength Concrete ◽  
Concrete Pipe

Prestressed concrete pipe pile with high bearing capacity, the advantages of convenient construction, low cost and widely used in practical engineering, because of the prestressed high strength concrete in use process is in complex stress state, both are under a lot of vertical load, and horizontal seismic action needs to be considered at the same time, it is necessary under the condition of considering the vertical load bearing capacity of prestressed high strength concrete level and considering the loading level, the horizontal bearing capacity. Scholars at home and abroad based on the simple hypothesis, puts forward the calculation method of a lot of interaction with soil, in the future will be adopted in calculation, using ABAQUS finite element analysis, this paper established the three-dimensional finite element model of prestressed concrete pipe pile, respectively under different vertical pressure (P = 4000 kn, P = 4800 kn, P = 6000 kn) one-way load and calculated the horizontal bearing capacity, and under repeated load, respectively to study the size of the different vertical pressure and different reinforcement stirrup ratio on its bearing capacity and seismic performance. The results show that the stiffness of pipe pile decreases significantly with the increase of vertical pressure under different vertical loads. With the increase of vertical load, the ductility and energy dissipation capacity of the components decrease gradually. The horizontal bearing capacity of prestressed high strength concrete pipe decreases with the increase of vertical pressure. However, its amplitude decreases with the increase of vertical pressure value.

scholarly journals Distribution of Load Forces in Hollow Core Slabs of Precast Solid Floor Supported on Bearing Walls

2019 ◽  
Vol 18 (2) ◽  
pp. 93-103
Author(s):  
S. V. Bosakov ◽  
A. I. Mordich ◽  
A. A. Karyakin ◽  
S. A. Sonin ◽  
I. S. Derbentsev
Keyword(s):  
Hollow Core ◽  
Load Bearing ◽  
Solid Plate ◽  
Hollow Core Slab ◽  
Building Wall ◽  
Labor Inputs ◽  
Full Scale Tests ◽  
Thrust Forces ◽  
Bearing System

The need to cut construction cost of residential and public buildings and provide them with a free and transformable planning structure during their operation cause interest in building wall systems with a large step of bearing walls. In order to reduce labor inputs and increase rate of construction in such building load-bearing system it is also necessary to maximize the use of large-sized prefabricated products and minimize consumption of in-situ concrete. In this case prefabricated products should be substituted according to the conditions of local (regional) construction industry base and volume of in-situ concrete must be sufficient to ensure a complete redistribution of internal forces between elements of the bearing system under load. As for the described bearing wall system of a multi-storey building the paper presents a flat precast solid floor formed by hollow-core slabs and monolithic crossbars supported by load-bearing walls. The hollow-core slabs supported at the ends on cast-in-place crossbars in the planes of bearing walls are arranged in dense groups between cast-in-place braced cross-beams. Dense contacts between overlapping elements are fixed by internal bonds. New data on distribution of forces in floor elements under the action of a vertical load have been obtained on the basis of full-scale tests and existing theoretical assumptions. It has been established that due to this load reactive thrust forces ensuring an operation of every hollow-core slab group in the floor as an effective solid plate supported along the contour have been originated in the floor plane along two main axes. Calculation of the reactive thrust forces makes it possible more accurately to assess a load-bearing capacity and rigidity of the precast solid floor and to increase a step of bearing walls up to 8 m and more while having hollow-core slabs with a thickness of 220 mm.

scholarly journals Experimental and Numerical Study on the Flexural Performance of Assembled Steel-Wood Composite Slab

2021 ◽  
Vol 13 (7) ◽  
pp. 3814
Author(s):  
Guodong Li ◽  
Zhibin Liu ◽  
Wenjia Tang ◽  
Dongpo He ◽  
Wei Shan
Keyword(s):  
Finite Element ◽  
Numerical Analysis ◽  
Bearing Capacity ◽  
Composite Beam ◽  
Numerical Study ◽  
Failure Process ◽  
Wood Composite ◽  
Load Bearing ◽  
Floor Slab ◽  
Floor Material

This paper presents research on a new type of fabricated steel–wood composite floor material in the style of a slab-embedded beam flange, using test methods and finite element numerical analysis to study the flexural load-bearing performance of the composite slabs. Through experimental phenomena, the failure process and mechanism of the composite floor are analyzed, and the deformation performance and ultimate bearing capacity of the composite floor material are assessed. Through numerical analysis of the finite element model, the influence of the connection mode of the floor and the composite beam, the type and number of connectors, and the width of the flange of the composite beam on the bending performance of the composite beam–slab system is studied. The research results show that the fabricated steel–wood composite floor slab has good load-bearing and deformation performance. The self-tapping screw connection of the floor slab is better than the ordinary steel nail connection, and the reasonable screw spacing is 100–150 mm. Increasing the flange width of the composite beam can significantly improve the load-bearing capacity of the steel–wood composite floor component.

scholarly journals Slinging Unit For A Hollow-Core Floor Slab Of Stand-Off Formwork

2021 ◽  
Vol 03 (09) ◽  
pp. 16-25
Author(s):  
Pulat Mirzaev ◽  
Keyword(s):  
Bearing Capacity ◽  
Technological Development ◽  
Protective Layer ◽  
Theoretical Data ◽  
The Body ◽  
Hollow Core ◽  
Utility Model ◽  
Metal Consumption ◽  
Hollow Core Slab ◽  
Full Scale Tests

Due to the fact that hollow-core slabs without formwork are produced without slinging loops (features of manufacturing technology), the issue of installation and transportation of these slabs has been solved. A constructive and technological solution is proposed for a slinging unit, arranged in the body of the slab, without the use of a slinging loop, and having only an anchor rod-dowel through which it is possible to directly sling the slab without using traditional slinging loops. The unit is designed with a reduced metal consumption and does not change the technology for manufacturing hollow-core slabs without formwork. Found and summed up a theoretical basis for calculating the bearing capacity of the proposed slinging unit, arranged in a hollow-core slab without formwork. It was revealed that the bearing capacity of the proposed slinging assembly, arranged in the body of a hollow-core slab, under the action of assembly loads, depends on the force of splitting the concrete of the protective layer located above the anchor rod-dowel of this assembly (all other things being equal). The theoretical data of the study were verified by full-scale tests of plates with slinging units arranged in their body, carried out in accordance with the proposed constructive and technological development. A utility model patent was obtained for the development of a loopless slinging unit for a hollow-core slab without formwork.

Stress Analysis of a Tire Under Vertical Load by a Finite Element Method

1977 ◽  
Vol 5 (2) ◽  
pp. 102-118 ◽  
Author(s):  
H. Kaga ◽  
K. Okamoto ◽  
Y. Tozawa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Computer Program ◽  
Temperature Rise ◽  
Strain Energy ◽  
Internal Stresses ◽  
Vertical Load ◽  
The Finite Element Method ◽  
Internal Temperature ◽  
Element Method

Abstract An analysis by the finite element method and a related computer program is presented for an axisymmetric solid under asymmetric loads. Calculations are carried out on displacements and internal stresses and strains of a radial tire loaded on a road wheel of 600-mm diameter, a road wheel of 1707-mm diameter, and a flat plate. Agreement between calculated and experimental displacements and cord forces is quite satisfactory. The principal shear strain concentrates at the belt edge, and the strain energy increases with decreasing drum diameter. Tire temperature measurements show that the strain energy in the tire is closely related to the internal temperature rise.

Design and Research of Double-Drum Winch with Anti-Pressure Wheel

2012 ◽  
Vol 479-481 ◽  
pp. 1709-1713
Author(s):  
Kai An Yu ◽  
Tao Yang ◽  
Chang Zhi Gong
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Finite Element Methods ◽  
Design Method ◽  
New Method

In view of the problems of large stress and severe bearing heating in double-drum winch at present, this paper adopted a new method to enhance bearing capacity for double-drum winch by adding anti-pressure wheels between two drums. Finite element methods were used to analyze the strength of 4000kN-traction double-drum winches with anti-pressure wheels and without anti-pressure wheels respectively. The results of the analysis revealed that the stress of the cylinder bearing decreased from 264MPa to 167MPa. The new method by adding anti-pressure wheels had remarkably improved the endurance of the bearing. Therefore, the design method can be widely used in large-traction double-drum winch.

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