bluuebunny/crossref_metadata_2025 huggingface dataset:
Internal Force Calculation and Analysis of Precast Reinforced Concrete Composite Thermal Insulation of External Wall
Authors: Wang Ying
Published: September 2013

This paper describes how to use the simulation calculation of finite element programs. Identification the internal force calculation formula of whole precast reinforced concrete composite insulation external wall with openings.In engineering on wall panels provide a basis for safe use.
Analysis of Repair Material Performance for Continuously Prefabricated Slab
Authors: Xu Kun , Ren Juan Juan , Zhang Ling Zhi , Hao Yuan Xing
Published: September 2013

Abstract.Under external loads, the continuously prefabricated slab of double-block ballastless track may crack easily. The cracks will reduce the durability and carrying capacity of the roadbed slab. Moreover, the cracks may also affect the use and safety of the double-block ballastless track during its service. When the roadbed slab crack, we should take some maintenance measures to maintain the normal use and durability of the double-block ballastless track. This paper based on the finite element method, established a beam-brick model for double-block ballastless track which has a through crack on the roadbed slab to analysis what kind of patching material is the most suitable when the most unfavorable loads act on the track. For this reason, we can provide theoretical basis for maintenance of double-block ballastless track .
Transient Diffusion Behavior of Chloride Ions in Concrete with a Macro Crack
Authors: Mu Song , De Schutter Geert , Liu Jian Zhong
Published: September 2013

Nowadays, influences of concrete cracking on durability of concrete structure are widely reported. However, the influence of macro cracks on chloride diffusion of concrete is unknown under the condition of marine submergence. Therefore, the present paper adopted a notch method to study natural chloride diffusion in cracked concrete with a width of above 0.3 mm. The results show Apparent diffusion coefficient of acid soluble chloride rises from 2.66 ×10-12 m2/s to 5.92×10-12 m2/s with increasing crack width from 0 mm to 0.45 mm. Besides, one exponential function was used to describe the piecewise relationship between diffusion coefficient (water or acid soluble chloride) and crack width.
Experimental Research and ANSYS Analysis of Temperature Field of Concrete Specimens Reinforced by Paste Method in the Fire
Authors: Li Yan Bo , Liu Jian Zhong , Fu Su Juan
Published: September 2013

In this paper, the temperature fields of concrete specimens reinforced by paste method were analyzed by experiment and ANSYS in the fire, it proved that the impact of reinforcement material on the temperature field of the specimens can be ignored, it identified that the best thickness of the fire-retardant coating is 40mm for steel-confined specimens and 50mm for CFRP-confined specimens. The calculations agreed well with the experimental results, it provides conditions for mechanical properties of the concrete reinforced by paste method at high temperature.
Study on Preparation of High Strength Gypsum by Flue Gas Desulfurization Gypsum
Authors: Zhang Ji Xiu , Duan Peng Xuan , Zhang Ye
Published: September 2013

In this paper, the flue gas desulfurization gypsum (FGD) generated from thermal power plant is used to produce high strength gypsum. The basic properties of super high strength gypsum prepared by FGD gypsum are investigated based on the test results of strength, thermal expansion rate, crystal appearance and size. The results indicate that the properties of high strength gypsum prepared by FGD gypsum above α50 standard. This can be a reference for gypsum-based α super high-strength gypsum related product development.
Influence of Freeze-Thaw Cycles on Multiaxial Strength of Concrete
Authors: Qin Li Kun , Gao Ling Xia , Song Hong Wei
Published: September 2013

Mechanical properties experiments of concrete after 0, 25, 50 and 75 freeze-thaw cycles under uniaxial and multiaixial compression were carried out. The uniaxial and multiaxial compressive strengths of ordinary concrete after freeze-thaw cycles were measured. According to the experiment results, the influence of freeze-thaw cycles on the ultimate compressive and tensile strength was analyzed systematically. The influence law of freeze-thaw cycles on compressive strength of concrete under multiaxial compression was obtained. The results indicate that the compressive strength of ordinary concrete after freeze-thaw cycles under multiaxial compression is higher than that under uniaxial compression, and the degree of improvement is depended on its stress ratio. This conclusion can propose theoretical foundation for design of concrete structures in cold environment
Experimental Investigations on Expansion Performance of Alkali-Aggregate Reaction of Mortar
Authors: Ouyang Feng , Chen Da , Liao Ying Di , Jiang Chao Hua
Published: September 2013

Volume expansion is the distinguishing characteristic of concrete occurring AAR. Expansion performance of mortar with different particle size composition aggregate was tested in this paper. The result show that MR specimens with part alkali active sand and R specimens with total alkali active sand present obvious expansion. But expansion ratio of NR specimen with inactive sand remains generally stable and is only 0.02%. Ultimate expansion ratio of specimen due to AAR is not in proportion to content of alkali active aggregate. There is a possible ratio for alkali active aggregate and inactive aggregate to acquire a larger ultimate expansion account. Furthermore, expansion ratio of specimens due to AAR and reaction time present the exponential function relationship.
The Simulation Experiment and the Similarity of Chloride Ion Erosion in Concrete under the Tidal Zone in the Marine Environment
Authors: Pan Yang Yang , Huang Jun , Zhang Jun Zhi , Jin Han Yang , Zhou Xue Mei
Published: September 2013

To obtain the similarity relationship between the simulation experiment and the field experiment of chloride ion erosion in the concrete under the marine environment, on the basis of chloride ion ingress concrete under the onsite marine environment in Zhou Shan, a series of field corrosion tests involving the chloride ion ingression in the costal tidal zone are carried out. By simulating the environmental parameters of the tidal zone, the onsite environmental elements are simulated and modified in order to accelerate the ingress of chloride ion in the concrete. And the accelerated experiment is designed and completed. By comparing the results from the indoor accelerated experiment and the field test, the similarity of the main ingress parameters between the indoor and onsite durability experiment is analyzed.
Progress and Review of Research on Durability of Hydraulic Concrete under Alternate Freeze-Thaw and Carbonation Effected by Wet-Dry Cycles
Authors: Shen Xiao Ming , Yang Hua Quan , Li Xiang , Li Ming Xia
Published: September 2013

A review of current worldwide researches on the durability of concrete was presented. Porosity and water content of concrete changing in wet-dry cycles were introduced, the failure mechanism of freeze-thaw and carbonation and the relation with pore structure, as well as its interaction influencing factors. Some key problems to be further studied were proposed on the basis of the research achievements of leaching.
Temperature Control and Anti-Cracking Measures for a High-Performance Concrete Aqueduct
Authors: Wang Zhen Hong , Yu Shu Ping , Liu Yi
Published: September 2013

To solve the problem of cracks developing on thin-walled concrete structures during construction, the authors expound on the causes of cracks and the crack mechanism. The difference between external and internal temperatures, basic temperature difference and constraints are the main reasons of crack development on thin-walled concrete structures. Measures such as optimizing concrete mixing ratio, improving construction technology, and reducing temperature difference can prevent thin-walled concrete structures from cracking. Moreover, water-pipe cooling technology commonly used in mass concrete can be applied to thin-walled concrete structures to reduce temperature difference. This method is undoubtedly a breakthrough in anti-cracking technology for thin-walled concrete structures, particularly for thin-walled high-performance concrete structures. In addition, a three-dimensional finite element method is adopted to simulate the calculation of temperature control and anti-cracking effects f. Results show the apparent temperature controlling effect of water-pipe cooling for thin-walled concrete structures.
The Role of Fly Ash in the Granulated Blast Furnace Slag-Based Geopolymer
Authors: Wu Cheng Xu , Zeng Hua Jun
Published: September 2013

Inorganic polymers using slag as cementitious materials have the advantage of a short setting time, high early strength, but the sensitivity of the reaction rate to temperature and the likelihood to subsequently crack, which leads to reduction of strength, limit its application. This article, by configuring different proportion of fly ash and slag, studied its dry shrinkage with the different kinds of activator, the effects of fly ash on the hydration heat release curves, differences of setting time and strength with different configuration, and then explored the effect of fly-ash in inorganic polymer. Experiments had shown that through rational configuration, the addition of fly ash can effectively reduce the rate of heat release and the amount of heat, meanwhile can solve the problem about short setting time of alkali-activated cementitious materials without reducing its strength.
An Experimental Study on Mechanical Properties of Basalt Fiber Reinforced Concrete
Authors: Chen Feng
Published: September 2013

As a new environment-friendly fiber material, the basalt fiber has been used in engineering construction to a certain extent. Through the tests for compressive strength and split tensile strength of concrete matrices in different ages, the reinforcement of basalt fiber for concrete was explored in this paper. As shown by the test results, the mixture with basalt fiber would efficiently enhance the ductility of the concrete being broken, and improve the compressive strength and split tensile strength of concrete matrices in different ages, in which the compressive strength of concrete in the age of 3d and the split tensile strength of concrete in the age of 28d were improved more significantly, by 9% and 19% respectively. The test analysis results can be used as a reference for application of basalt fiber in concrete projects.
Experimental Research on Temperature-Stress of Inorganic Polymer Concrete
Authors: You Chun Zi , Fan Xiao Chun , Wu Di , Pu Li Ping
Published: September 2013

The inorganic polymer concrete is a new environmentally material. Using the temperature - stress test machine to research its early cracking sensitivity, and compare it with the normal concrete. The deformation development process of inorganic polymer concrete consists three stages:early contraction, expansion, contraction to cracking; cracking temperature can effectively evaluate the overall cracking performance of concrete; the cracking temperature of inorganic polymer concrete is 14.2 °C, the normal concrete is 14.4 °C; the inorganic polymer concretes cracking stress is 2.658MPa, the normal concrete is 0.582MPa. The results show the inorganic polymers cracking performance is better than the normal concrete.
Study on Polymer-Modified Concrete for Improving Flexural Toughness
Authors: Cao Qing Yu , Hao Ting Yu , Sun Wei
Published: September 2013

This paper studies how polymer alters the flexural toughness of concrete. By selecting five different types of polymer mixing into concrete; results indicate that polymer has obvious effect to enhance toughness of concrete evaluated by toughness index T. Microstructure of polymer-modified concrete were studied through environment scanning electron microscope, digital micro-hardness tester and nanoindentor, results indicate that polymer form the ionic compounds and reduce the crystallization of Ca (OH) 2, acting as a flexible filler and reinforcement in concrete. Polymer also alters the microstructure at the aggregatecement interfacial transition zone.
Size Effect of High Performance Concrete with Blast Furnace Slag on Compressive Strength and Modulus of Elasticity
Authors: Park Wan Shin , Kim Jeong Eun , Eom Nam Yong , Kim Do Gyeum , Cho Myung Sug , Yun Hyun Do
Published: September 2013

The 100 x 200 mm cylinder specimens are standard size to measure the compressive strength and modulus of elasticity. However, it is not enough for experimental data of mechanical properties of HPC about size effect. The aim of this study is to investigate the size effect of high performance concrete (HPC) using blast furnace slag (BS) for mechanical properties such as, compressive strength and modulus of elasticity. Therefore, in this study, Type A (100 x 200 mm cylinder specimens) and Type B (150 x 300 cylinder specimens) were prepared. Blast furnace slag is used as a replacement for ordinary Portland cement (OPC). The compressive strength, modulus of elasticity of harden concrete were determined in the laboratory.
Research on the Grading Effect of Polycarboxylate Superplasticizer
Authors: Li Zhi Kun , Peng Jia Hui
Published: September 2013

In this paper, polycarboxylate superplasticizer (PC) was separated by ultrafiltration to investigate function on dispersion of various portions of PC. It is found there is a grading effect on the dispersion and adsorption of polycarboxylate superplasticizer, through fluidity and adsorption experiments.
Adsorption Behavior of Polycarboxylate Superplasticizer on Cement Particles
Authors: Li Zhi Kun , Peng Jia Hui
Published: September 2013

In this paper, the adsorption behavior of polycarboxylate superplasticizer (PC) on cement was examined. Through adsorption of PC, adsorption area of the molecule was calculated, and it is found that PC molecule would maintain curled shape when it was adsorbed on the surface of cement particles.
Research on the Properties of Sea Sand Mortar
Authors: Fan Yi , Zhang Rong Hui , Chen Zhen Bei
Published: September 2013

With the city's large-scale construction, there have been a shortage of river sand in some areas. So, abundant, low-cost sea sand gradually being used in construction. However, sea sand can not be directly applied to the production of building materials, such as building mortar. Sea sand must be desalted and admixtures must be added to the sea sand mortar. In this paper, using a variety of sand to make cement mortar, and comparing the performance of them. Studies have shown that, compared with the ordinary mortar, the strength and the durability of the sea sand mortar modified by colloidal crystal have improved significantly.
Evaluation on Viscosity Reducing Effect of Road Commonly Warm Mix Agents
Authors: Du Qun Le , Wang Chao Hui , Yang Lu , Li Yan Wei
Published: September 2013

In order to solve the problem of high dependence on manufacturers or high blindness when warm mix agents are chosen in project. On the basis of the action mechanism that the agents can reduce viscosity of asphalt so that the asphalt mixture can be mixed at low temperature, an investigation on the extent of reducing viscosity on construction temperature of these agents are presented when temperature and the mixing amount of warm mix agents are different. The optional mixing amount of different warm mix agents are recommended, providing a theoretical basis for the selection and application of warm mix agent in our country.
Influence of Hydration Heat of Fly Ash Concrete on Size Effect
Authors: He Xi Xi , Zhao Dian Biao
Published: September 2013

In this paper, the influence of fly ash concretes sustained hydration heat release effect on strength size effect was studied, by using different curing temperature indoor and outdoor in winter. The results showed that the reduce of hydration heat for fly ash concrete is not conducive to ensure the strength of concrete cured outdoor or indoor in winter. However, the growth of volume is beneficial to ensure the necessary hydration heat in concrete curing, so that the size effect of concrete strength appears that the strength increases with size increasing.
The Effect of Sand/Cement Ratio and Cement Grade on the Compressive Strength of Foam Concrete
Authors: Geng Ji Chuan , Ni Kun , Fang Shan Qi , Shi Yun Xing , Ding Yi Ning , Zhang Yan Gang
Published: September 2013

A series of experiments have been undertaken to investigate the effects, on compressive strength, of variable sand/cement ratios and cement grade. Ten mixtures of different s/c ratios used two kinds of cement were cast and the compressive strength at different curing ages was tested. The results indicate that the compressive strength gets lower as the s/c ratio increases for both 42.5R and 32.5R cement. For the mixtures used 32.5R cement, the 28-day compressive strength is pretty low for the s/c ratios of 1.5 and 2. The specimens used 42.5R cement have higher compressive strength than those with 32.5R cement. The compressive strength decreases from 42.5R to 32.5R cement are significantly smaller for the s/c ratios of 0.5 and 1 than the other three s/c ratios.
Influence of Workstation Screen for Indoor Mechanical Ventilation
Authors: Li Yu Jiang , Yang Yan An
Published: September 2013

This paper uses the PHOENICS software to discusses a screen set mode's influence on the indoor mechanical ventilation, then calculated face wind speed, air temperature, air age and PMV. And analyzes the comparison of data, therefore concluded a reasonable way of setting screen in the office building.
A New Air-Conditioning System with Chilled Water Storage
Authors: Lin Hu , Li Xin Hong , Cheng Peng Sheng , Xu Bu Gong
Published: September 2013

For the purpose of grid peak load shifting, chilled water storage has been paid more and more attentions to integrated with air-conditioning system. In this paper, a new air conditioning system with directly chilled water storage is given. With peak-valley Price, cost for power consumption can be saved 15%-20% by coordinated operation between chilled water storage system and air conditioning system. By sensitivity analysis of system economic performance on ratio of peak price to valley price, it is revealed that with much higher ratio of peak price to valley price, not only system economic performance can seldom be improved, but also chilled water storage is restricted for engineering utilization. This paper supplies theory reference for engineering application of chilled water storage technology.
The Study of Soil Temputerature Change of GSHP System in Winter Conditions
Authors: Shen Guo Min , Xu Yang , Zhou Jing Yu , Hu Ping Fang , Xiao Hang
Published: September 2013

This paper does the simulation analysis of the annual energy consumption of an office building and the simulation of the whole GSHP(Ground Source Heat Pump) air conditioning system operation for two years. With the dynamic load, The simulation of the temperature field is done about the ground heat exchanger soil area with the radius of 2.5m during the heating period and the downtime. The result shows that soil temperature variation decreases gradually from the center to the distal end, in the first five days after shutdown, the soil temperature recovers faster, and then gradually becomes slowlier.
Numerical Simulation Analysis of Composite Air Purifying Device
Authors: Liu Jian Long , Zhang Hai Ping , Wang Han Qing , Chu Yu Hui
Published: September 2013

To solve the technical problems existing in air purification, a multilevel air purification device was presented. And the new device is the combination of catalytic purifying technology of low-temperature plasma, nanoscaled titania and dual-band ultraviolet. For further studies on performance of the composite purification device, the device has been numerically simulated, through CFD simulation technology, by employing gas phase turbulence model, porous medium model and stochastic particle trajectory model. Contrast and analysis was made on velocity distribution, particle motion state and the pressure distribution of the internal flow field under different wind speed. The most appropriate wind speed could provide better centrifugal effect and less pressure loss. So some rules of velocity and pressure distribution in internal device were acquired.
Research on City Gas Load Forecasting Method
Authors: Wang Ting Ting , Tan Hong Yan
Published: September 2013

The paper mainly studied the gas forecasting in gas-consuming rush hour and long-term load forecasting.The paper analyzed the factors influencing the volume of gas forecasting in rush hour and forecast the volume of gas in rush hour using fuzzy method and RBF neural network. In long term city gas load forecasting, there are some characters such as longer time and uncertain demand increasing. A method is proposed to weakening the original data by using buffer operator before use GM(1,1)model. It indicated that the result acquired by these methods was satisfied with the requirement of engineering, and it was helpful to dispatchers.
The Study of the Ventilation Influence to Gas-Based Direct Reduction Shaft Furnace Flow Field
Authors: Bai Ming Hua , Ge Jun Li , Piao Ying Min , Wang Jian , Fu Yuan Xiang , Xu Kuan
Published: September 2013

Direct reduced iron (DRI) shaft furnace flow field has important influence to the DRI production process, and the ventilation is a key factor for the velocity and pressure distribution of the gas flow in the furnace. At present works, the direct reducing gas velocity distribution and pressure distribution of DRI shaft furnace were studied with different ventilation. By the analysis of numerical simulation, the result was found that the direct reducing gas velocity increase with height in the shaft furnace reduction section. The velocity of the direct reducing gas augment with the increase of ventilation. The direct reducing gas pressure add with increasing height in the shaft furnace reduction section. With ventilation increasing, the pressure of the shaft furnace ventral part increase, and the pressure gradient increase in the direction of height in the DRI shaft furnace.
Basic Research of Solar Seasonal Thermal Storage Capacity Increase to Existing Heating System
Authors: Ma Shuang , Yao Yang
Published: September 2013

Based on the principle of deepening the use of solar which is renewable energy, we proposed a new system that utilize solar seasonal thermal storage capacity to increase existing district heating, the peak load will be met by solar seasonal thermal storage is the salient feature of this system. This article described related content of the system basic research, including system design and operation control mode, also discussed the physical model of the major part of the composition system, to lay the foundation for in-depth study.
Study and Application on the Kinetic Parameters of Elastic Wave for the Engineering Rockmass
Authors: Wang Hong Yi , Ding Wu Xiu , Xu Tao
Published: September 2013

In the quality assessment and classification of engineering rockmass, the elastic wave velocity of rockmass has already become an important parameter. But the valve of the elastic wave velocity has obvious anisotropy which is resulted from the non-uniformity characteristics of the rockmass. Therefore, if the measured elastic wave velocity is directly applied to the quality assessment of engineering rockmass, it will not can reflect the actual engineering properties of the rockmass. In order to solve the above problem, the energy variation of elastic wave propagating in the rockmass is studied. According to the field tests of the rockmasses with different weathering degrees, the dynamic characteristics of the elastic wave such as the attenuation and the dominating vibration frequency are analysed. The relationship between the kinetic parameters and the elastic wave velocities is researched. The results show that there is a good correlation between the kinetic parameters of the wave and the weathered rockmass, which can be applied to the rockmass quality classification and the engineering geology assessment.
Research on the SVM Classification of Active and Passive Remote Sensing Data Based on the Feature Per-Parcel
Authors: Wang Shuang Ting , Wang Chun Lai , Du Wei Bing , Tong Le Le , Wang Fei
Published: September 2013

Pepper and Salt" phenomenon and misclassification phenomenon are serious and the accuracy is low based on pixel classification, when only use a single remote sensing image. In this article, joint LiDAR data and high resolution image together based on feature per-parcel classification,and in the image segmentation stage, texture feature is introduced, these can full use of spectral informationtexture feature and elevation information in classification, to solve same object with different spectra and same spectrum with different objects. Compared with the classification based on pixel, only use a single remote sensing image, the method based on feature per-parcel with spectrumtexture and elevation information achieved a high accuracy,96.94%, improved the classification result.
Based on Inclinometer to Measure Dynamic Deflection of High-Speed Railway Bridge
Authors: He Xian Long , Zhao Li Zhen
Published: September 2013

The dynamic deflection measurement is an important component to the bridge loading test of high-speed railway bridge. Using inclinometers to test the Dynamic deflection is a good method for High-Speed Railway bridge deflection detection. In this paper, we develop a new inclinometer and a new theory to fast calculate deflection. It has been use to detect the dynamic deflection of Baishui River bridge on FuZhou-WenZhou High-Speed Railway when high speed train runs across at kinds of speed. Results indicate: comparing with the measurement results of photoelectric deflection detection system, all dynamic deflection measurement results of inclinometers are very accuracy. Their deflection curves are also similar. All results also show: Using our inclinometers to test High-Speed Railway bridge dynamic deflection can get precise results and can satisfy the dynamic deflection measurement request of high-speed railway bridge. Comparing with other methods of dynamic deflection measurement, this method is very easy to operate., do not need stop the traffic, and not affected by weather, and not need a static reference point, can measure the dynamic deflection of any beam bridge.
Analysis and Research of Single Base Station CORS Precision
Authors: Zhao Ya Hong , Gao Hai Feng
Published: September 2013

Around the single station CORS system, a series of relevant experiments were conducted, the measurement was analyzed. Through base station as the center, different distances of single base station GPS-RTK measurement were carried on , the radius of actual operation and its changing law with the base station distance were obtained concluded , the measurement precision was Obtained by measuring static GPS control points,; the measurement actual coverage area positioning accuracy was confirmed, Internal, extern al accord accuracy was calculated and analyzed., the system actual service radius and The extent of different range accuracy was obtained . the results show that the single base station system is more suitable for the development of small and medium-sized cities, its actual operating radius is 28km, it can completely satisfy the city one or two traverse survey in 18 km.
Design of Light-Small Mobile 3D Laser Measurement System
Authors: Sun Yi Bo , Zheng Xin Qi , Jia Zong Ren , Ai Gang
Published: September 2013

At present, most of the commercial 3D laser scanning measurement systems do work for a large area and a big scene, but few shows their advantage in the small area or small scene. In order to solve this shortage, we design a light-small mobile 3D laser scanning system, which integrates GPS, INS, laser scanner and digital camera and other sensors, to generate the Point Cloud data of the target through data filtering and fusion. This system can be mounted on airborne or terrestrial small mobile platform and enables to achieve the goal of getting Point Cloud data rapidly and reconstructing the real 3D model. Compared to the existing mobile 3D laser scanning system, the system we designed has high precision but lower cost, smaller hardware and more flexible.
A New Organization and Indexing Method of Multibeam Point Cloud Data in 3D Marine GIS
Authors: Peng Lei
Published: September 2013

Multibeam sounding system can be used for the acquisition of high-precision digital seabed terrain model, it brings new opportunities for the development of 3D marine GIS (Geographic Information System). But its massive point cloud data poses great challenge for its storage and visualization. This paper proposes a new storage strategy and gives an optimized visualization method specifically for the storage strategy. First, we take advantage of the point cloud coordinates regularity to sort these points according to certain rules and efficiently organize it through multiple spatial index. Vertically, a multi-level pyramid index is established. We generate a number of levels data with different level of detail and different scale, namely the static level of detail (LOD) model, in this way, a trade-off between appropriate redundant storage space and efficient data retrieve is achieved. Horizontally, for all levels of the pyramid model, we establish a tiled quadtree index, and generate a cache image for each tile. Secondly, an optimized visualization method in accordance with the storage strategy is also designed. Based on the current area of interest and data dispatch algorithm, we calculate the corresponding tile location and directly load the cache image to lessen the workload of complex spatial data operation, reduce the rendering burden of spatial data. We can generate customized dynamic cache with specific area of interest and scale, to improve the visual effect, too.
Application of Modularized Low-Position Jacking Formwork System in Core-Tube Building
Authors: Zhou Ji Zhong , Lin Qi , Liao Ming Pi , Zhuang Jin Ping , Cai Xue Feng
Published: September 2013

Compared with other template construction technology, jacking formwork system has the advantages of self-climbing, less operating personnel, good safety and good construction quality, with relatively innovative construction techniques and technology and has been widely used in the construction of tall buildings in recent years. The lifting principles and characteristics of jacking formwork were introduced in the paper. Based on the application in a tall building project, construction technologies of the formwork were introduced.
Roller Compacted Concrete Dam Compacted Thickness Increased Analytical Quality Assurance
Authors: Hu Chen
Published: September 2013

At present, roller compacted concrete (called RCC) technology has developed rapidly. So in order to make the RCC dam, RCC dam construction technologies have been further developed and accelerate its construction schedule. Many projects have begun to regulate the conduct of RCC which has been breakthrough in compaction layer thickness 30cm field test, which by increasing RCC compaction layer thickness. Many experiments construction proved that: RCC roller compacted concrete layer thickness increasing is feasible. However the increasing compaction thickness, the deck construction process and the successful completion of the jelling time of concrete is the key factors to ensure quality of the dam. It is the big prerequisite for completion. We will integrate field test to the quality control of the dam after the compacted layer thickness is increased.
Subsoil Vibration Characteristics in the Anchor Holding Process
Authors: Wang Ying Jian , Fan Xue Man
Published: September 2013

The main factor, anchor damage, leading to the faults of submarine optical fiber cables (SOFC) were analyzed, and the significance of the research was illuminated on the anchor holding process. Also, the force situation of the anchor holding process was analyzed quantitatively under some assumptions; subsoil vibration characteristics caused by the anchor were analyst with mathematical modeling.
Wavelet-Based Multilevel Discrete-Continual Finite Element Method for Local Deep Beam Analysis
Authors: Akimov Pavel A. , Mozgaleva Marina L.
Published: September 2013

High-accuracy solution of the problem of deep beam analysis is normally required in some pre-known domains (regions with the risk of significant stresses that could potentially lead to the destruction of structure, regions which are subject to specific operational requirements). The distinctive paper is devoted to correct wavelet-based multilevel discrete-continual finite element method for local analysis of deep beams with regular (in particular, constant or piecewise constant) physical and geometrical parameters (properties) in one direction. Initial discrete-continual operational formulation of the considering problem and corresponding operational formulation with the use of wavelet basis are presented. Due to special algorithms of averaging within multigrid approach, reduction of the problem is provided. Resultant multipoint boundary problem of structural mechanics for system of ordinary differential equations with piecewise-constant coefficients is given.
Numerical Analysis of the Influence of Bolt Pretension on Flexible Flange Joint Rigidity in Substation Steel Structures
Authors: Song Jun Shan , Liu Hai Tao , Du Chun Hao , Hong Dong Po , Zhang Tao
Published: September 2013

In order to research the influence of bolt pretension on the flexible flange joints stiffness further, ANSYS finite element model was built on the basis of experimental investigations, and was used to research the influence of bolt pretension on the axial rigidity, shear rigidity and bending rigidity. The calculation results indicated that the axial rigidity, shear rigidity and bending rigidity were all increased along with the increase of bolt pretension, and the increase of axial rigidity was most obvious.
Refined Theory of Transversely Isotropic Elastic Beam Posting inside Winklers Foundation
Authors: Cao Xu , Zhang Hua Xun
Published: September 2013

A refined theory of transversely isotropic beam posting inside Winkler foundation is derived without ad hoc assumptions. Based on elasticity theory, the displacement field and stress states of isotropic body are studied. From boundary conditions, the refined theory of transversely isotropic beam posting inside Winkler foundation is given. The approximate equations for the beam under transverse loadings are derived directly from the refined beam theory.
Experimental Research on Performance of Aircraft Tanker Truck with Different Oil Pump in the Plateau
Authors: Li Jiang , Zhang Wei Ming , Yang Xiao Jun , Wu Jian Jun
Published: September 2013

Introduced the basic situation of aircraft tanker truck, carried out the performance tests of the tanker truck with ZX120-100 and ZX120-100-GY self-suction oil pump in the plateau. The test result shows that the self-suction capability of ZX120-100-GY centrifugal oil pump is better than ZX120-100 centrifugal oil pump, and refueling performance of 2004-12000 aircraft tanker truck with ZX120-100-GY centrifugal oil pump is good which can afford the demand of the aircraft.
Rate of Regeneration of Construction Machinery
Authors: Rajczyk Jarosław
Published: September 2013

All kinds of products can be conditionally divided into two types, ie. those that can be regenerated and those without the possibility of undergoing regeneration. Regeneratives are those products which, in the event of failure are eligible for repair. To this category, almost all types of machines, mechanisms and devices can be assigned to. Products that are not regenerative are those that, which in the event of failure do not qualify for regeneration in a given situation or because of principle. These include gears, springs, bearings and electronic components. Indicators for the reliability of products that can be regenerated differ from those which may be defined for parts or elements that are not to be regenerated. The concept of reliability index is understood as the quantitative characterization or evaluation of one or more of their characteristics or features. The length of work or the volume of work accomplished can be called work done during that time is assessed over time or related to its indicators. Parts, until they become defective, may work 100 hours, 10 cycles, 10000 km, etc. However, in terms of related concepts distinguish between work done to the first failure, the work between defects (for parts which are subject to regeneration). Given that the regenerable and non-regenerable calculation of indicators are different and will be subject to separate consideration.
Structure Design of Hand-Held Excavator
Authors: Luan Zhen Hui , Gao Wei Peng , Wang Chao
Published: September 2013

At present the hole digging pile is excavated in artificial by digging the hole .This method usually works in low efficiency, high labor intensity of workers and poor security situations. So through the analysis of the artificial excavating pile 's requirement, there is necessary to create a new structural of a machine with the help of pneumatic conveying system to dump soil. In this paper the authors introduce a hand-held excavator which has the above structure in excavating. This machine adopted a motor as a power device, used secondary gear reducer to achieve speed-down, and drill bit was driven by the transmission shaft to complete the excavation. The machine has the digging ability of 240mm excavation pit diameter, simple structure design. It can meet one man operation requirements, and can be carried easily.
Research on Efficiency Test of Mixed-Flow Pump with Different Blade Angles
Authors: Sun Sha Sha , Xu Bing Feng
Published: September 2013

Mixed-flow pump is one of the most widely used general machinery, it is necessary to study the efficiency of the mixed-flow pump. In this paper, we have made a test on a mixed-flow pump model. After testing we got the conclusion that the mixed flow pump efficiency analysis of experiments in 6 different blade angle of operation, through the analysis of the status, to this model the suitable angle is-4 °.
Some Boiler Tubes Crack Reason Analysis
Authors: Pan Ling , Xie Xue Jun , Shen Jun , Li Zhao , Wang Rui , Yang Yang , Peng Ke Ru
Published: September 2013

Aiming at some boiler tubescrack in a power plant, the element composition and the valence of elements in corrosion products on the outer surfaces of the boiler tubes were analysed by Scanning Electron Microanalyzer (SEM) and X-ray Photoelectron Spectroscopy (XPS), and the corrosion reason and mechanism of the outer surfaces of the boiler tubes were studied.The results showed as follows. (1)The content of element S in the corrosion products on the outer surfaces of the fire side boiler tubes was bigger than that in the corrosion products on the outer surfaces of the back side boiler tubes and the corrosion of the outer surfaces of the fire side boiler tubes was more serious than that of the outer surfaces of the back side boiler tubes. (2) the element S in the corrosion products existed in the form of sulfate (SO42-), because the valence of S in the corrosion products on the outer surfaces of the fire side boiler tubes and the back side boiler tubes was +6, not-2. (3) the element Fe in the corrosion products on the outer surfaces of the fire side boiler tubes and the back side boiler tubes existed in the form of Fe3O4, Fe2O3 or Fe2(SO4)3. (4) The corrosion of the boiler tubes was induced by sulphate under high temperature, and aggravated with the temperature of the outer surfaces of the boiler tubes elevated.
Numerical Simulation of Cross-Flow around Four Cylinders in a Square Configuration Using Lattice Boltzmann Method
Authors: Zhang Wei , Ye Hui Hua , Tao Jian Hua
Published: September 2013

The flow around four cylinders in a square configuration with a spacing ratio 4 and Reynolds number of 200 are investigated using lattice Boltzmann method for angles of incidence α=0 and 45º, respectively. The results show that no biased flow occurs and the flow pattern is symmetrical at α=0, and the vortex shedding exists after the upstream cylinders which is completely different from the experimental results. It is hard to explain the discrepancy at present. The phenomenon of vortex shedding in-phase observed in the experiment reappears in the numerical simulation at α=45º.
Applied Research of Grey Relational Analysis in the Energy Efficiency Assessment of Pump Station
Authors: Shi Meng Jie , Shi Kun , Xu Gao Jie , Hu Man Yin , Tong Rui Ming
Published: September 2013

The core of energy efficiency assessment (EEA) among energy consumers is to establish an integrated assessment model. In the paper, first, EEA process was described, and an assessment methodology based on gray relational analysis was introduced. Afterwards, a motor driving pump system was further studied as a typical example. By sorting pump-related standards and literatures, three indexes were chosen to form an assessment model for pump station, which were motor efficiency, unit energy consumption and pump efficiency, respectively. According to grey relational analysis, the operating data of one pump station in 24 hours a day was calculated and evaluated, and the result shows the feasibility of this EEA methodology for various energy systems, which provides a fresh idea for comprehensive evaluation of energy efficiency.
The Application of Fault Tree Analysis in the Safety Performance of Cutter Suction Dredger
Authors: Zhou Yu Gang , Xu Huan Min
Published: September 2013

Cutter suction dredgers (CSD) play a major part in the field of dredging engineering in harbors, fairways, and land reclamation. CSD can continuously mine and transport the slop with good quality while CSD can tackle many types of soil. However, even a component failure, which is connected with parts and components of CSD, can result in no working. Thus, it affects the production capacity and efficiency of dredgers seriously. It is necessary to analyze the failure probability of CSD. The method of Fault Tree Analysis (FTA) is applied to analyze the failure probability of CSD. The method uses logical reasoning and builds a fault tree model by analyzing the relationship between the basic, intermediate and top events. Based on fault tree model of a variety of events " and " " or " relationship, we can obtain minimal cut sets of that cause the event to failure. Then, get the basic probability of the event. Finally, we can calculate the probability of the top events. Under experiments, the FTA method can accurately calculate the failure probability of CSD, and deduce in reverse order the key events that cause the top event. The study on the key events can reduce the failure probability of CSD, enhance its reliability and safety, and improve the efficiency and productivity indirectly. It will also lay a foundation for product configuration optimization.
Numerical Vs. Experimental Simulation of a Suspended Water Tank Considering Dynamic Sloshing Effects
Authors: Pasquino Vittorio , Ricciardi Enrico
Published: September 2013

This paper presents the experimental simulation on a prototype of a typical suspended water tank. The experimental results have been compared with numerical simulations by adopting two different models for the evaluation of the dynamic sloshing effects in presence of the seismic actions. The first one is a concentrated mass model, analyzed by the numerical code SAP2000 and the second one is a continuous model analyzed by the numerical code FemLab. The results of the experimental analysis allowed the validation of the numerical modeling and showed the importance to evaluate the dynamic sloshing effects in the design and in the seismic verification of a water tank in seismic areas. The experimental investigation confirms the reliability of the numerical models proposed, by highlighting the validity of the simplified model with concentrated masses for the evaluation of the shear force and the bending moment at the base of the tank. More sophisticated numerical modeling are needed only for the evaluating the stress/strain states generated in the walls of the water tank.
Research of Coupling Single-Mode Fiber-Optic Vibration Sensor and Experimental Test
Authors: Ma Bin
Published: September 2013

A new kind of coupling single-mode fiber-optic sensor is presented and the working theory is discussed. Vibration tests of the sensor are carried out. The vibration experimental system based on cantilever are setup and explained in detail. Dynamic response of coupling single-mode fiber-optic sensor compared with piezoelectric sensor is investigated and the result is excellent. Experimental results show that the coupling single-mode fiber-optic sensor is suitable for vibration measurement practically.
Research on Evolution Mechanism of PROT Project Financing Entropy about Operating Public Infrastructure - Take Small and Medium Hydroelectric Energy Projects for Example
Authors: Wang Yan Wei , Wang Song Jiang , Huang Yi
Published: September 2013

Small and medium hydropower projects have to be suspended due to various reasons. Paper tries to study it as the perspective of entropy. With systems theory and entropy theory, paper defines the concept of project finance entropy. Through PROT project financing entropy analysis of the causes and mechanisms, it established entropy mathematical model of PROT project financing. And through the model, paper makes a detailed analysis of project financing entropy evolution mechanism.
Discussion about the Construction Project Management Mode Based on the Contract Text
Authors: Jiang Yun Xia
Published: September 2013

Firstly, the characteristics and the application of the common project management modes at home and abroad are simply analyzed. Secondly, the common project contract texts at home and abroad are compared and analyzed. Then the construction project management modes based on the contract text are discussed. Hope the research conclusions can give people some help.
History and Topics of the Project Management
Authors: Xie Hai
Published: September 2013

Project management is the overall planning, coordination, and control of a project from beginning to completion. Project management is aimed at meeting a clients requirement in order to produce a functionally and financially viable project. Project management is project management that applies to the construction sector. The construction industry is composed of five sectors: residential, commercial, civil, industrial, and environmental. A construction manager holds the same responsibilities and completes the same processes in each sector. All that separates a construction manager in one sector from one in another is the knowledge of the construction site. This may include different types of equipment, materials, subcontractors, and possibly locations. A contractor is assigned to a construction project once the design has been completed by the architect or is still in progress. This is done by going through a bidding process with different contractors. The contractor is selected by using one of the three selection methods: low-bid selection, best-value selection, or qualifications-based selection. A construction manager should have the ability to handle public safety, time management, decision making, mathematics, and human resources.
Research on Standardization of Whole Process Cost Consultation Business - A Case of Davis Langdon and Seah
Authors: Yan Ling , Li Jian Ping
Published: September 2013

The total cost consultation provides personalized services for clients while integrating the various stages of standardization work. Standardization is foundation of the total cost consultation. This article determines the key points of the standardization of the total cost consultation through literature research. And the key points--the standardization of business operation, personnel management and business audits are verified by the case study of Davis Langdon and Seah to provide reference for the domestic total cost consultation.