Influence Factors Of Bearing Capacity Research Articles

Examining mechanical behavior of steel-bamboo composite I-section column under long-term loading

The steel-bamboo composite structure is a novel composite structure, which is characterized by light weight and high bearing capacity of structural components, as well as excellent seismic performance and good thermal performance of fabricated buildings. To facilitate its engineering application and better understanding the deformation law of composite column during design reference period, mechanical properties of steel-bamboo composite column under long-term loads are investigated in this paper. 27 composite I-section columns were designed and fabricated, among which 18 specimens were first investigated in static loading test with steel ratio and slenderness ratio as main parameters, failure modes and effect of each parameter on the axial compression performance was observed and analyzed. Then, a self-balanced loading device was designed to perform long-term loading test on 6 specimens with loading level and steel ratio as main parameters, and the other 3 specimens were adopted to monitor the temperature effect on creep. The creep process of specimens was observed and the nonlinear fitting analysis of creep data was carried out using Burger model. Once the predetermined long-term loading duration was reached, the secondary static loading test were carried out to study the influencing factors of bearing capacity and deformation, as well as their variation laws. Further, calculation formula of yield bearing capacity was derived by analyzing yield conditions of composite column, as two calculation methods of ultimate bearing capacity were proposed based on superposition principle and limit equilibrium theory. Results show that the composite columns have good integrity, high deformation capacity and bearing capacity, which improves significantly with the increase of steel ratio and decreases with the increase of slenderness ratio. Creep deformation become basically stable after 90 days of loading, which can be accurately described by Burger model. After the long-term loading, ductility and ultimate strain of the specimens were obviously increased, while the bearing capacity was not significantly affected. The average error between the theoretical and experimental results of yield and ultimate bearing capacity is smaller than 7%, which indicates that the established calculation methods have high accuracy and are suitable for predicting the bearing capacity of steel-bamboo composite I-section columns. It is proved that scientifically designed steel-bamboo composite columns have reliable bearing capacities and controllable deformations, and can be safely applied to practical projects.

Analysis of Bearing Capacity of Steel-High Strength Concrete Composite Beams

It is very crucial to analyze the flexural bearing capacity of the steel-high strength concrete composite beams, but the combination on the flange of steel beam and their bearing capacity is limited with certain inevitability,in addition, in the negative bending regions of continuous composite beams, with the constant increase of load, the process of the whole structure will cause damages in the negative moment region. In order to avoid this kind of damages, we must use general finite element program ANSYS to analyze thebearing capacity of the steel and high strength concrete composite beams. Besides further studying the influence factors of bearing capacity, and ensuring the safety of our engineering performance can be in favor of the engineering structure.

几何缺陷对索拉穹顶弹塑性承载力的影响分析

利用有限元对索拉穹顶进行了特征值屈曲分析，得到了索拉穹顶的屈曲模态，并确定出最不利的屈曲模态阶数。通过讨论几何缺陷形式、大小的变化对结构弹塑性承载力的影响，进一步分析了预应力和杆件截面变化时几何缺陷对弹塑性承载力的影响。分析结果表明：第二阶特征值屈曲模态的缺陷形式对结构最不利；随着拉索预应力的增加，几何缺陷对弹塑性承载力的影响先不变后减小；钢杆件截面改变时，几何缺陷对弹塑性承载力的影响基本不变。 Eigenvalue buckling analysis of solar dome was done firstly, then the the buckling modes were got and the most unfavorable mode was pointed. The influence factors of bearing capacity, such as the form and bigness of geometric defect, were discussed. The influence of prestress and the section of rod was further studied. The result shows: The second-order buckling mode is the most unfavorable mode; as the prestress of rop grows, the influence of geometric defect to elastoplastic carrying capacity increases firstly and then decreases; as the section of rod changes, the influence of geometric defect to elastoplastic carrying capacity essentially unchanged.

Study on Influence Factors of Bearing Capacity of Water-Lubricated Thrust Bearing and its Improving Methods

Water is a kind of low viscosity liquid and the bearing capacity of water lubrication bearings is very low. The influence factors of bearing capacity of water-lubricated thrust bearing and its improving methods are studied. First, bearing capacity characteristic of water-lubricated bearings is expounded. Secondly, the main factors of affecting bearing capacity are analyzed. At last, by combining the master pump motor running condition, the bearing capacity is improved by changing many factors including the material and hardness matching of friction pair, the roughness of grinding area, bearing structure, fan-shaped bushes number, pivot location, confined area of bearing, speed and the medium temperature, etc. The study provides a theory basis for improving bearing capacity of water-lubricated bearings.

Numerical Simulation Analysis of the Ultimate Bearing Capacity of the Circular Steel Tube K-Joints Reinforced with the Concrete

In order to solve the insufficient bearing capacity of the large-diameter circular steel tube K-Joints, the chord in the joint zone is filled with the concrete. The reinforcement of bearing capacity that the concrete makes to K-Joints is researched with the finite element numerical simulation method, in consideration of the material nonlinearity and the geometric nonlinearity. The numerical computation of bearing behavior is employed to eighteen groups of the large-diameter circular steel tube K-Joints and reinforced ones with the concrete (RK-Joints). The failure styles and the influencing factors of bearing capacity are analyzed with RK-Joints. The result shows that the bearing capacity of K-Joints is enhanced significantly by the concrete filled in the chord in the joint zone. The load-deformation curves reveal the changing regularity that the bearing capacity of joint follows the relevant parameters. It can provide reference for the engineering application of RK-Joints.

Bearing Behavior of Steel Foot Pipe in Tunnel on Soft Base

Numerical simulations were conducted to investigate the bearing behaviour of steel foot pipe. Main mechanical affections occur at the lateral zone, and the maximal stress occurs at the lateral end of the pipe. With the increase of cross direction load, the maximal stress increases and exceeds the strength of material, and the pipe is pulled out. The influencing factors of bearing capacity of the steel foot pipe were studied. Some important results different from engineering experiences are as following: 1) to steel foot pipe that can not penetrate the soft base, its reasonable dip angle is very small for its low longitudinal bearing capacity; 2) steel pipe with diameter of 42mm is unsuitable for foot steel pipe because its low cross bearing capacity; 3) to a given geological condition and pipe parameter, the reasonable length of steel pipe is certain, extra longer pipes can’t obtain larger capacity; 4) surrounding rock near the support structure should be especially reinforced by drilling grouting holes along the whole steel pipe.

Integrity analysis of bumpy-ridge beam in the pre-stressed wire winded framework

The principle of carrying and the influencing factors of bearing capacity of bumpy-ridge beam in pre-stressed wire winded framework are analyzed.The applied load and anti-shearing coefficient on divided surface would influence the integrity of Bumpy-Ridge beam in the pre-stressed wire winded framework.This is analyzed by using Patran/Marc.In addition,experiments on 350 MN turbine forming press's 1:10 model have also been done.The results of finite element method and model experiments agree well,which indicates that if the split interface is not treated,the integrity is kept only by friction.The framework in pre-tighten state can keep integral,but in synthesized state will offset If the divided surface is treated,the anti-offsetting capability of interface will be greatly improved.Even under the maximum working load,the framework still can keep integral well.