Analysis of Bearing Capacity and Buckling Stability of Large-scale Corrugated Steel Webs

2021 ◽  
Author(s):  
Shuqin Li ◽  
Biao Hou ◽  
Jing Song
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Buckling Stability

The Influence of Stochastic Imperfection Field on the Bearing Capacity of Hyperbolic Cooling Towers

2011 ◽  
Vol 374-377 ◽  
pp. 2297-2300
Author(s):  
Hai Zhao ◽  
Ya Zhou Xu ◽  
Guo Liang Bai
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Initial Imperfection ◽  
Orthogonal Basis ◽  
Imperfection Sensitivity ◽  
Stochastic Field ◽  
Buckling Mode ◽  
Material Inhomogeneity ◽  
Initial Imperfections ◽  
Distribution Form

The uncontrollable factors such as construction errors, material inhomogeneity, etc. will inevitably lead to a certain initial imperfections. It is generally known that the stochastic initial imperfection of the structure is an important factor for affecting structural stability and bearing capacity. Since these imperfections are random in nature, this paper proposes the method mainly based on the standard orthogonal basis to expand the stochastic field, taking into account the decomposition of the stochastic initial imperfections related to structures, which is projected in the buckling mode orthogonal basis. In the end, the article by the stability analysis example shows that this method can use less random variables effectively describing the original stochastic imperfection field, and efficiently search for the most unfavorable initial imperfection distribution form in order to ensure the imperfection sensitivity structures have a higher reliability, so it can be applied to large-scale engineering structure stochastic imperfection analysis.

scholarly journals An Experimental Study of Horizontal Bearing Capacity of Vertical Steel Floral Tube Micropiles with Double Grouting

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Kaiyang Wang ◽  
Yanjun Shang
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Slip Surface ◽  
Bending Moment ◽  
Shear Capacity ◽  
Soil Reinforcement ◽  
Scale Model ◽  
Soil Pressure ◽  
Floral Tube ◽  
Grouting Pressure

This paper examines the performance of a novel technology, vertical steel floral tube micropiles with double grouting. It is the combination of micropile technology and double grouting technology. A large-scale model tank was applied to impart horizontal bearing capacity, and the slope soil pressure and flexural performance of the micropile were investigated under four experimental conditions. The peak grouting pressure during the double grouting process was defined as the fracturing pressure of the double grouting, and it was positively correlated to the interval time between first grouting and secondary grouting. Compared with traditional grouting, double grouting increased the horizontal bearing capacity of the single micropile with the vertical steel floral tube by 24.42%. The horizontal bearing capacity was also 20.25% higher for the structure with three micropiles, compared with a 3-fold value of horizontal sliding resistance. In the test, the maximum bending moment acting on the pile above the sliding surface was located 2.0–2.5 m away from the pile top, and the largest negative bending moment acting on the pile below the slip surface was located 4.0 m away from the pile top. The ultimate bending moment of the single pile increased by 12.8 kN·m with double grouting, and the bending resistance increased by 96.2%. The experimental results showed that the double grouting technology significantly improved the horizontal bearing capacity of the micropile with the steel floral tube, and the soil reinforcement performance between piles was more pronounced. Also, the shear capacity and the flexural capacity were significantly improved compared with the original technology.

scholarly journals Pavement Subgrade Stabilization with Lime and Cellular Confinement System

2018 ◽  
Vol 13 (2) ◽  
pp. 87-93
Author(s):  
Muhammet Vefa Akpinar ◽  
Erhan Burak Pancar ◽  
Eren Şengül ◽  
Hakan Aslan
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Clayey Soil ◽  
Dry Weight ◽  
Hydrated Lime ◽  
Load Test ◽  
Lime Stabilization ◽  
Plate Load Test ◽  
Reaction Coefficient ◽  
Geocell Reinforcement

In this study effectiveness of lime stabilization and geocell reinforcement techniques of roads was investigated for low bearing capacity subgrades. For this purpose, a large-scale plate load test was designed and used. Clayey soil with high moisture content was reinforced with different percentages of hydrated lime (5%, 10%, 15% dry weight of the soil). The deflection and stress results indicated that lime stabilization or geocell reinforcement alone did not significantly increase subgrade reaction coefficient and bearing capacity values. Promising results were obtained on stabilization of weak subgrade when both techniques were used together. It was determined that cellular reinforcement increased the reaction modulus coefficient value and bearing capacity of the subgrade soil by more than 15% compared to the lime stabilization.

Numerical Analysis on the Bearing Capacity of Single Pile in Deep Excavation Area

2013 ◽  
Vol 671-674 ◽  
pp. 226-229
Author(s):  
Jun Jie Wu ◽  
Jin Jian Chen ◽  
Shuai Jun Liu ◽  
Jian Hua Wang
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Numerical Study ◽  
Back Analysis ◽  
Load Test ◽  
Deep Excavation ◽  
Static Load Test ◽  
Fem Modeling ◽  
Vertical Bearing ◽  
Element Technique

Large-scale deep excavation may affect the bearing capacity of piles inside the excavation zone. It does not only cause the loss of friction, but also change the stress state of the subsoil. In this paper, nonlinear finite element technique is employed to investigate the bearing capacity of piles influenced by the deep excavation. Parameters of soil are obtained by back analysis on the pile static load test results. The bearing capacity of the piles during excavation is analyzed by performing FEM modeling under three conditions using the calibrated parameters. The numerical study shows that the loss ratio of vertical bearing capacity of pile foundation caused by excavation unloading is 34%.

Experimental and large-scale field tests of grid-anchor system performance in increasing the ultimate bearing capacity of granular soils

2016 ◽  
Vol 53 (7) ◽  
pp. 1047-1058 ◽  
Author(s):  
M. Mosallanezhad ◽  
N. Hataf ◽  
S.H. Sadat Taghavi
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Field Tests ◽  
Experimental Tests ◽  
Ultimate Bearing Capacity ◽  
Soil Reinforcement ◽  
Granular Soils ◽  
Anchor System ◽  
Scale Field ◽  
Large Scale Field

Soil reinforcement by means of geogrid is an effective method of increasing the ultimate bearing capacity (UBC) of granular soils. In this study a new system, created by adding cubic anchors to ordinary geogrids, is introduced to increase the UBC of granular soils. This system is called “grid-anchor” (G-A). To analyse the performance of the G-A system in increasing the UBC of granular soils, 45 experimental tests and 9 field tests were performed, the results of which show that the G-A system is 1.8 times more capable than ordinary geogrids in increasing the UBC in square foundations. Furthermore, the failure of soil reinforced by the ordinary geogrid takes place at a settlement of 9% of the foundation width, while the same value for the G-A system is almost 13%.

The Finite Element Analysis on Axial Tensile Bearing Capacity of Round Steel-Tubes Reinforced with CFRP Sheets

2011 ◽  
Vol 368-373 ◽  
pp. 1595-1599
Author(s):  
Xiu Li Wang ◽  
Jun Jie Li
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Large Scale ◽  
Steel Tubes ◽  
Element Analysis ◽  
Cfrp Sheets ◽  
Finite Element Software ◽  
Axial Tensile ◽  
The Finite Element Analysis ◽  
Circumferential Reinforcement

The numerical simulation calculation on round steel-tubes reinforced with CFRP sheets was done through the large-scale finite element software ANSYS. In this research, four factors were comparatively analyzed so as to obtain the influence of them on ultimate axial tensile bearing capacity of steel-tubes. These four factors are longitudinal reinforcement length rate , thickness , elastic modulus and circumferential reinforcement ways of CFRP sheets. The results show that the ultimate axial tensile bearing capacity of steel-tubes strengthened with CFRP sheets is enhanced significantly and the reinforcement effect is very good.

Volume Displacement Effects on Pile Capacity in Loose Sand

1973 ◽  
Vol 10 (4) ◽  
pp. 645-647
Author(s):  
Eli I. Robinsky ◽  
Christopher B. H. Cragg
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Loose Sand ◽  
Soil Pressure ◽  
Pile Capacity ◽  
University Of Toronto ◽  
Testing Facility ◽  
Large Scale Testing ◽  
The University ◽  
Displacement Effects

Preliminary tests in the new large-scale testing facility at the University of Toronto reveal that bearing capacity on a pile volume basis is more efficiently developed by a long slender pile or a group of short slender piles than by a pile of larger diameter. The authors attribute this to increased arching in the soil around the pile of greater volume displacement, believing arching buffers the pile from the effects of lateral soil pressure.

scholarly journals Comparative Analysis of Support Stiffness Based on On-Site Laying of Rectangular Parallelepiped Fiber Reinforcement Sack

2020 ◽  
Vol 20 (6) ◽  
pp. 47-53
Author(s):  
Yoon-Sik Park ◽  
Ja-Yeon Kim ◽  
Ki-Young Eum ◽  
KookHwan Cho
Keyword(s):  
Bearing Capacity ◽  
Large Scale ◽  
Field Tests ◽  
Fiber Reinforcement ◽  
Physical Property ◽  
Vertical Displacement ◽  
Rectangular Parallelepiped ◽  
Train Speed ◽  
Comparison And Analysis ◽  
Large Scale Tests

The roadbed reinforcement method, in which a rectangular parallelepiped fiber reinforcement sack is used, is ecofriendly and overcomes the disadvantages of the conventional roadbed reinforcement method. Through large-scale tests, the effects of improving the bearing capacity, stability, and constructability according to the train speed were confirmed. Physical property investigations of the field test were conducted to analyze the conditions of the roadbed. The settlement degree of the site, where the reinforced section and unreinforced section were placed, was measured and analyzed. A rectangular parallelepiped fiber reinforcement sack was laid. Based on the physical properties determined during the field tests, this section was found to be soft ground composed of silt sand with a low bearing capacity. In addition, through comparison and analysis of the degree of settlement caused by the laying of rectangular parallelepiped fiber reinforcement sack, the dynamic vertical displacement of rails and sleepers decreased by at least 84%. It was shown that the track stability improved when the rectangular-parallelepiped fiber reinforcement sack was laid, which reduced the dynamic behavior along and improved the track support.

scholarly journals Type Synthesis of 3-Translational Redundant Actuated Parallel Mechanisms With Closed-Loop Branch Chains Based On Graphical Approach

2021 ◽  
Author(s):  
Yongquan Li ◽  
Hong-Sheng Jiang ◽  
Tian-Yu Zheng ◽  
Ke-Long Xi ◽  
Han Jing ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Parallel Mechanism ◽  
Large Scale ◽  
Vibration Isolation ◽  
Closed Loop ◽  
Screw Theory ◽  
Simple Calculation ◽  
Parallel Mechanisms ◽  
Logistics Industry ◽  
Graphical Approach

Abstract The 3-translational parallel mechanism is widely used in industrial, medical, and military fields, among others. With the development of the national logistics industry, a pressing need for a kind of 3-translational parallel mechanism emerged. Such mechanisms have high stiffness and high bearing capacity and are used for cargo handling and sorting. A novel method based on the graphical approach was proposed for the synthesis of 3-translational redundancy actuated parallel mechanism with closed-loop branch chains. The new mechanism has four symmetrically arranged branch chains, which eases subsequent kinematics and dynamics analyses while providing good mechanical properties. Based on the graphical approach theory, according to the constraint number contained in the branch chain, two types of redundant driven branch chains with closed-loop structures were constructed. The first type includes rotation constraint in one direction, while the second type includes the rotation constraint in two directions. Based on various combinations of two branch chain types, their allocation schemes can be divided into two types. Moreover, said these two allocation schemes can be integrated into at least 500 and 400 types of 3-translational redundant actuated parallel mechanisms with closed-loop branch chains. Then, the degree of freedom properties of representative mechanisms were tested using the screw theory. A large number of novel mechanisms were integrated assessed using this method, and branch chains such mechanisms were symmetrically distributed. They have a strong bearing capacity, simple calculation, and control, and can be applied to the handling and sorting of goods, large-scale precision machine tools, and large construction machinery vibration isolation systems, among others.

scholarly journals Steel piles driving procedure and result analysis of extradosed Bridge Mainland - Pelješac

2021 ◽  
Author(s):  
Bicheng Tang ◽  
Dong Zhang ◽  
Xuefeng Wang ◽  
Jingli Xie
Keyword(s):  
Bearing Capacity ◽  
Pile Foundation ◽  
Large Scale ◽  
Pile Driving ◽  
Test Results ◽  
Driven Piles ◽  
Marine Environmental Protection ◽  
Result Analysis ◽  
Marine Environmental

In order to meet the high requirements of marine environmental protection and Eurocodes, based on the actual construction conditions of deep water on site in Croatia, the extra-long steel pile foundation was adopted to Pelješac Bridge. At the meantime the corresponding extra-large scale pile driving barge had to be used to carried out during the construction. The pile bearing capacity was analyzed and checked by the actual measured PDA (Pile Driving Analyzer) data. The test results showed that the toe bearing capacity of driven piles had linear relationship with blow counts, and the penetration (displacement/blow) before the stoppage was inversely proportional to toe bearing capacity. In addition, the traditional empirical formula of long-term pile bearing capacity of driven piles was only suitable for the piles, which were shorter than 100m. The stoppage criteria of extra-long pile should concentrate on penetration firstly, while the pile design elevation was subsidiary factor. Therefore, the analysis of pile driving procedure and results could be considered as significant actual engineering reference for the coming works.

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