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CFG pile, soil between the piles and lining constitute composite foundation and the technology for lining is always a key for the successful application of the composite foundation. For the problem of effects of actions about lining on CFG pile and composite foundation, through test and according to the text result of three pile composite foundation, this paper discuss the influence of lining thickness...
This paper presents evolutionary-based optimization procedure for designing truss structures. The Shuffled Complex Evolution optimizer (SCEO) is used for solving the nonlinear constrained optimization problems. In this optimum design formulation, the objective function is the material weight of the truss; the design variables are the cross-sections of the truss members; the constraints are the stresses...
As the most critical component of a deep manned submersible, the manned pressure hull provides a safe living space for pilots and scientists under the deep sea pressure and its weight occupies almost 1/3 total weight of the manned submersible. So the pressure hull should be designed to have enough strength and should be as light as possible. However, a comparison of the current available design rules...
Non-destructive evaluation (NDE) is an effective and reasonable technology for utilization in wooden material. Facing the defects of wooden material, the effective NDE appears practically significant for protecting wood structures. Major NDE techniques and equipments applied in wood structures detection were systematically summarized. Then State of main researches on NDE used in wooden material was...
According to the characteristic of moisture expansion in porous media, action mechanism and influencing factors of moisture stress in building walls were analyzed and moisture expansion experiments were carried on commonly used porous media such as tiles and cement mortar. The results and analysis of the experiments indicate that: The moisture content and gradient inside the wall are affected by thermal...
An evolutionary approach is presented to solve the topology optimization of the structures with tension-only or compression-only materials. To find their optimal topologies by traditional methods is very hard for the sake of the material in the structures should be considered as nonlinear and an isotropic one in structural analysis process. To avoid such difficulties, the reference-interval with material-replacement...
This paper presents a modal analysis method of the base of welding robot by using the finite element analysis software ANSYS release10.0. The base suffers large dynamic stress as shock and vibration while welding robot works, which on the one hand lead to lower precision of welding, on the other hand, may cause the base damaged. Thus dynamic analysis is necessary for design of the base of welding...
Acoustic emission (AE) is a dynamic nondestructive measuring and testing method, which is widely used in safety and integrity evaluation of structure and material. This paper investigates the relationship of micro cracking process of the pipeline material and acoustic emission phenomenon in detail, and establishes the connection between micro cracking of the material and AE counts. Experiments were...
Due to their high corrosion and chemical resistance, glass fiber reinforced plastic (GFRP) materials are increasingly being used in the construction of industrial chimneys. In this paper, the finite element model of a 60 m high GFRP chimney with the diameter of 3 m is established using finite element software ANSYS. The cylindric chimney, steel supporting frames and the two anchor cables are meshed...
The different characteristics of pavement structure layer has been found that it can be directly reflected by FWD (falling weight deflectometer) deflection basin. However, the existing back-calculation method for the pavement modulus is regarded as complex, highly specialized approaches, hence, it is mainly used for the scientific research and design. In this paper, an approximate calculation model...
The AUV(Autonomous surface vehicle) is widely used for military purpose and scientific purpose. The AUV can save human life from severe environment and reduce the operating cost of underwater equipment. Generally, hulls of AUV are made of composite materials or metal alloys such as aluminum alloy and titanium alloy. Composite materials are well known as its light weight, corrosion resistance and freedom...
This paper gives an accelerated evolutionary algorithm for structure topology optimization. It combines the merits of level set method and Evolutionary Structure Optimization (ESO) for structure topology optimization. The traditional level set algorithm has some drawbacks, for instance, its resultant optimal topology configuration depend on the initial configuration of the structure. Additionally,...
Abstract-The Ultra High Voltage (UHV) transmission steel tower develops with characteristics of heavy load, high rise and complicate structure. For the reliability and rationality, it is necessary to optimizate tower structure in the design. In this paper, structural optimazition of material and section of tower member and computation model of design are studied for the China UHV tower. According...
Metal fatigue is one of the most important failure modes to be considered in mechanical and structural design. The only satisfactory way to prevent fatigue failures in the service life span is by proper design; i.e., being able to predict the fatigue lifetime of a particular design through design analysis or testing. For engineering applications, designers need a simple and reasonably accurate design...
To research structural strength of twin seat underframe in motor train unit, lightweight design and improvement, two analytic methods which are FEA and the experiment are used. First of all, twin seat underframe model is built. And according to the requirements of twin seat underframe, material property and loads are defined. FEA model is built and analyzed. Then, comparison result of FEA and experiment...
Monte Carlo simulation and modification are carried out to rectify the negative prediction of standard deviation of the logarithm of fatigue lives and the absence of confidence assessment of historic probabilistic fatigue S-N curves. An adjustable random numerical generator, mix multiplicative isogenous arithmetical compliment method, is applied in the random simulation process. Sample size for the...
One of the main concerns of mechanical structures is structural damage due to fatigue. This phenomenon is accentuated in initial flaw of structure, areas of stress concentration, and the connection of components, etc. Initial fatigue quality and configuration of structure have the most important effect on durability. However, obtaining equivalent initial flaw size (EIFS) of structure with durability...
A precast, prestressed concrete girder with circular web openings allows building service systems (mechanical, electrical, communications, and plumbing) to cross the girder line within the memberpsilas depth, reducing a buildingpsilas floor -to-floor height and the overall height of the structure. These height reductions have the potential to improve the competitiveness of total precast concrete structures...
In order to investigate the behavior of adhesive anchor group under combined moment and shear loading, a numerical simulation is carried out in this paper with finite element analysis. In studied models steel-to-concrete connections by post-installed adhesive anchor are used. The analysis results show that the failure of anchor steel occurs in all specimens and only slight concrete cone appears under...
This paper is concerned with structural health monitoring techniques for pipe wall thinning using ultrasonic guided wave methods. First, our inspection model can be represented by linear elastic systems on a cylindrical shell. Secondly, numerical scheme of inspection is developed by Fourier-Galerkin approximations. Thirdly, we propose a computational method for identifying position, range, and sizing...
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