bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Construction Technology of Latex Cement Mortar Pouring Composite Pavement
Authors: Zhong Ke , Sun Mingzhi , Li Yongdong , Wang Xue
Published: December 2019

Pouring composite pavement is one ideal type of pavement structure, but research on the pouring composite pavement is still in its infancy, especially in the construction technology. The normal pavement construction machinery is not compatible with this kind of pavement structure, while the construction efficiency is relatively low, which is not conducive to large-scale construction and affects its popularization and application. Based on the latex cement mortar pouring composite pavement developed by the authors, the pouring composite pavement construction methods of macroporous open-graded asphalt pavement and latex cement mortar are mainly introduced in this paper. According to the characteristics of macroporous open-graded asphalt mixture, the mixing temperature, dry/wet mixing time, paving speed, rolling combination mode and temperature of the mixture were studied, and the key construction process was put forward; For the construction of latex cement mortar, the construction technology of cement mortar production, pouring method and pouring time are mainly studied, and the construction process of cement mortar pouring is put forward.
Research and preparation of waste cement slurry as concrete admixture
Authors: Chen Zhanhua , Lai Guangxing , Fang Yunhui , Zhang Xinfu , Guo Yuanqiang
Published: December 2019

The application of waste cement slurry as concrete admixture was studied. The chemical constituents, the particle size distribution and concrete test of waste cement slurry were investigated. The results show that the addition of a suitable amount of WS-1 will not have a great impact on the strength of concrete, while improving the workability of the concrete. According to the paper, WS-1 can be used as a admixture to adjust the workability of concrete.
Test Study on the Expansion Mechanical Properties of Regenerated Anhydrite Rock
Authors: Li Lei , He Liang , Wang Yao
Published: December 2019

Dihydrate gypsum was formed after the anhydrite was immersed in water, and the volume of rock increased significantly. In order to analyze the expansion mechanical properties of Ordovician anhydrite rock, anhydrite rock samples (regenerated anhydrite rock) were obtained by high temperature drying of anhydrite rock samples, and then the rock expansibility were studied. Experiments show that: (1) Rock expansion curve of regenerated anhydrite shows three typical stages: linear rapid increase stage, concave stage and stable stage, and its maximum value of rock expansibility appears at the end of the second stage. (2) The expansion is closely related to the porosity of rock and the comprehensive performance between rock expansion and dissolution, and the average value of force in group B is 2.5964MPa and C is 1.9693MPa. The test scheme and results can provide references for the study of mechanical behavior of gypsum under dry wet cycling.
Experimental study on the electrical conductivity of SSG composite concrete
Authors: Yan Fengyuan , Li LinJie , Jiang Zhiwei , Ji Yuhang , Feng Lei , He Peiling
Published: December 2019

to study the influence of steel slag, slag and graphite content and age on the electrical conductivity of concrete, the electrical resistivity of concrete specimens with specifications of A(100mm×100mm×100mm) and B(100mm×100mm×400mm) was tested. The results show that: With the increase of curing age and the increase of cement substitution by steel slag: slag, the concrete resistivity continues to increase, and the electrical conductivity continues to decrease; and the optimal blending ratio of steel slag: slag is 1:2, the influence of graphite content on concrete conductivity Larger; as the size of the test piece increases, the electrical resistivity of the concrete decreases.
Study on the Mechanical Properties of Large Rectangular and Shallow Embedded Pipe-Jacking During Pushing-Process
Authors: Yunchen Wang , Jianhua Huang , Luming Yang
Published: December 2019

With the continuous increase of urban population, the development degree of urban underground space is increasing, and the pipe jacking method has been widely used in the construction of urban underground space. This paper analyzes the disturbance mechanism of the pipe jacking construction on the surrounding soil, and analyzes the actual results of the surface subsidence in the rectangular pipe jacking project of Baima Road in Fuzhou Baolong Wanxiang Square and the civil defence project. By combining the three-dimensional finite element model, the law of ground surface settlement and deformation during the construction of shallow-buried large-section pipe jacking under the conditions of coastal stratum is studied. And through the on-site monitoring settlement data of the project and the finite element simulation, the ground surface subsidence deformation law and the pipe-tube stress variation law of the shallow-buried large-section pipe jacking under the coastal stratum are mastered, which can be used for the design and construction of related similar projects for reference in the future.
Experimental investigation on double lipped channel cold-formed thin-wall steel column under compression loading
Authors: Shi Yijian , Lin Bing , Zhang Qingyu , Zhang Pingping
Published: December 2019

:In order to investigate the compression behavior of double lipped channel cold-formed thin-wall steel column used in Box housing, a total of 12 columns with three different lengths(3000mm,2556mm,2000mm, respectively)and two different thickness(3mm, 4mm )were tested to investigate the ultimate load-carrying capacity and deformation behavior of cold-formed steel. It is found that the thickness has an obvious effect on compression ultimate load-carrying capacity, while the length does not have much influence. The failure modes of most specimens contain local buckling. Test analysis result simulated by finite element analysis (FEA) agreed well with the experimental data, which verified the FEA analysis method is appropriate. The analysis method provided in this paper can be referenced for the design of Box housing.
Experimental study on the effect of reinforcement ratio on the ultrasonic velocity and modal frequency of concrete members
Authors: Zhou Xiwu , Wang Xiangyu
Published: December 2019

In order to study the effect of reinforcement ratio on ultrasonic sound velocity and modal frequency of reinforced concrete members, 13 concrete circular cross-section short columns were designed to detect the ultrasonic sound velocity and self-strain of short columns with different cuff ratio and longitudinal reinforcement ratio. Compared with non-reinforcing short columns, the results show that the stirrup reinforcement ratio is from 0.4% to 1.667%, the ultrasonic sound velocity is increased by 3.4%, the modal frequency is increased by 1.8%; the longitudinal reinforcement ratio is from 1.772% to 2.657%, the ultrasonic sound velocity is increased by 3.5%, and the modal frequency is increased 4.1%; the reinforcement can improve the ultrasonic sound velocity and the natural vibration frequency of the concrete to a certain extent, the change of the reinforcement ratio causes the same regular change of the sound velocity and the modal frequency.
Synthesis of Fe3O4-based Magnetic Nanocomposites and Application in Pesticide Residue Detection
Authors: Dong RongRong , Yang ChunLiang , Lin LinYun
Published: December 2019

Magnetic nanomaterials are a new kind of nanomaterials with great potential application value. Recently, there have been many reports about the combination of magnetic nanomaterials and agricultural residue detection technology to establish a new detection method. Due to the special super paramagnetic, the large number of surface active sites, easy separation and recovery, the Fe3O4 magnetic nanocomposite material is commonly used in complex sample pretreatment on extraction and enrichment of the target compounds. By combining with the target substance in complex sample matrix and under the action of external magnetic field, the material can quickly, simply and efficiently enrich and extract trace substances in the sample. This paper mainly introduces the application of Fe3O4-based magnetic nanocomposites in the detection of pesticides and the main preparation methods of Fe3O4-based magnetic nanocomposites, including coprecipitation, microemulsion, photothermal chemistry and ultrasonic decomposition, hydrothermal reaction and sol-gel method.
AIE-active positional isomers based on tetraphenylethylene attaching o-/m-/p-formylphenyl groups for reversible mechanochromism
Authors: Shan-Ni Shan , Jiang Lixian , Li Jie , Li Yiheng , Zeng Yan , Wang Jin-Liang , Lv Guiqin
Published: December 2019

Three AIE-active positional isomers, TPE-4(Ph-o-CHO), TPE-4(Ph-m-CHO) and TPE-4(Ph-p-CHO), which are tetraphenylethylene (TPE) derivates peripherally attaching ortho-/meta-/para-formyl phenyl groups, were designed and synthesized. The formyl substitution position caused different intramolecular charge transfer (ICT) of the isomers, which can effectively modulate their photophysical properties and mechanochromism. TPE-4(Ph-o-CHO), TPE-4(Ph-m-CHO) and TPE-4(Ph-p-CHO) exhibited remarkable aggregation-induced emission (AIE) characteristics. Moreover, TPE-4(Ph-o-CHO), TPE-4(Ph-m-CHO) and TPE-4(Ph-p-CHO) possessed mechanochromic property, which displayed distinguished color changes. Thus, three isomers are potential to be applied in mechano-response sensors or optical storage materials.
Study on Properties of New Mg-Y-Nd-(La+Ce)-Zr Degradable Magnesium Alloy
Authors: Zhang Jiang , Dai Yuelai
Published: December 2019

The new Mg-Y-Nd -(La+Ce) -Zr magnesium alloy was taken as the research object to study the types and contents of rare earth alloys. The corrosion properties were studied by scanning electron microscope and electrochemical experiments. The results showed that the new Mg - Y - Nd - (La + Ce) - Zr magnesium alloy had no toxicity to human cells and had ideal corrosion resistance. The mean corrosion rate at 96 h was <0.3mg/(cm2h). The mechanical properties test showed that the new magnesium alloys had good mechanical properties, its tensile strength >220Mpa, elongation >20%.
Study of Corn Stover Particle Size Distribution Characteristics for Knife Mill and Hammer Mill
Authors: Su Dongping , Yu Manlu
Published: December 2019

Corn stover is a major agricultural biomass feedstock. The particle size distribution (PSD) of ground corn stover is important for biomass to bioenergy conversion. The objectives of this study were to evaluate Rosin-Rammler (RR) distribution, normal distribution and lognormal distribution on analysing PSD of corn stover grinded by knife mill and hammer mill, and to compare the grinding performance for knife mill and hammer mill. RR distribution model provided the best fitting results (0.998⩽Adj.R
2⩽1) to the ground corn stover among the three PSD distribution models. The grinding performance based on the characteristic parameters (geometric mean diameter, geometric standard deviation, RR distribution parameter) analysis for the knife mill is better than the hammer mill for grinding corn stover under the same conditions.
System design and analysis on organic Rankin cycle for asphalt plant’s waste heat recovery
Authors: Bai Jie , Cao Leilei , Cao Lulu
Published: December 2019

An organic Rankin cycle system was investigated with the purpose of utilizing the waste heat from the asphalt plant’s rotary dryer. The factors that have the impact on the heat source properties by means of combustion and heat transfer were discussed. The ORC system was developed utilizing R245fa as the working fluid, in consideration of the operation conditions of the cycle and its environmentally-friendly characteristics. An evaporator which support phase-change heat transfer was chosen, because most of the energy is in latent heat of the vapour. A radial inflow turbine was selected due to the output power of the system. The operation data of the asphalt plant was taken to evaluate its potential of energy recovery. It can generate 104.4kW electricity when the ORC system is combined with JD3000 asphalt plant. If the electricity is used to the plant itself, 17.1% of electricity power could be saved. The scheme proposed could provide a new solution to the waste heat recovery of the asphalt plant.
Indirect Determination of Penicillamine using Fe(II)-Phenanthroline Spectrophotometry
Authors: Wen Xinrong , Tu Changqing
Published: December 2019

Fe3+ can react with penicillamine to form Fe2+, the amount of Fe2+ is directly proportional to the addition of penicillamine in system, and then Fe2+ reacted with the chromogenic reagent of phenanthroline to form a stable complex which its maximum absorption wavelength is 511nm. The content of penicillamine is determinated by measuring the absorbance of the stable orange red complex. The method for the indirect determination of penicillamine using Fe(II)-phenanthroline spectrophotometry has been established. The method is used to the determination of penicillamine in tablets, and the results are satisfactory.
Quantitative Detection of Fe3+and F-based on the Fluorescence “OFF-ON” of Quinine Sulfate
Authors: Xie Peng , Tian Liang , Zhang Jianhui , Li Ting , Xiang Canhui
Published: December 2019

In this experiment, a method for continuous detection of Fe3+and F-based on the fluorescence “OFF-ON” of quinine sulfate was designed. Through the addition of Fe3+, the fluorescence spectrum of quinine sulfate appeared “OFF”. Then, when F-was added, the fluorescence appeared “ON” again. By this method, we can get the quantitative detection of Fe3+and F-continuously. The detection limit of Fe3+is 1.0×10-5mol/L and the linear range is 4×10-5mol/L-8×10-4mol/L. The detection limit of F-is 4.4×10-5mol/L and the linear range is 1.2×10-4mol/L-2.4×10-3mol/L.
Comparative Study on the Fingerprint of Asparagi Radix by HPLC
Authors: Yang Xiaosong , Huang Xulong , Li Xiaofen , Feng Hua , Kong Juan , Wang Xiangpei , Wu Hongmei
Published: December 2019

Objective: Asparagi Radix is a commonly used herbal material in Traditional Chinese Medicine. A positive phase liquid chromatography fingerprints method was developed to compare the differences between Asparagi Radix and its decoction pieces and counterfeits. Methods: The chromatographic separation was performed on a GOLD HILIC column (250 mm × 4.6 mm, 5 μm) with a gradient elution program using a mixture of acetonitrile and 0.01% phosphoric acid water as mobile phase at 220 nm wavelength, the flow rate was 0.8mL/min and the column temperature was 30°C. Results: The fingerprints of Asparagi Radix from different sources and its decoction pieces and counterfeits were determined by HPLC, and the similarity was analyzed. Eight common peaks were identified of 5 batches of Asparagi Radix from different origins, with similarity of 0.503-0.812. One common peak was identified by fingerprints of 5 batches of Asparagi Radix and 9 batches of its decoction pieces, with similarity of 0.407-0.766. Five batches of Asparagi Radix and two batches of its counterfeit were identified three common peaks, the similarity was 0.511-0.727. Three common peaks were identified by fingerprint of 9 batches of Asparagi Radix decoction pieces, with similarity of 0.507-0.793. Conclusion: By comparing the similarity of different origins of Asparagi Radix, the similarity of Asparagi Radix and its decoction pieces, the similarity of Asparagi Radix and its counterfeits, it was found that the common chemical compounds of Asparagi Radix was less, and the difference was more significant. The results indicated that the developed method could be reflect the differences in chemical composition among different sources of Asparagi Radix, its decoction pieces and its counterfeits, and served for the quality identification.
Hydraulic power plant pressure vessel manhole fillet weld hidden trouble investigation
Authors: Li Wenbo , Liu Lanlan , Zhang Jun , Chen Junjun , Xie Yi , Sun Lipeng
Published: December 2019

As an important part of the power station, the pressure vessel plays a key role in the normal operation of the power system. However, as pressure vessel itself is a kind of equipment with high risk, if the power station does not carry out strict safety management, it is easy to cause serious safety accidents in the normal operation of power vessel, resulting in irreparable heavy losses. However, in terms of the current situation of the safety technical management of pressure vessels in most power stations in China, there are still many problems and deficiencies. Even some power stations do not realize the importance of this problem, which leads to certain potential safety problems of pressure vessels. Through this paper, the author shares many years of experience in the testing of pressure vessels in hydropower plants, as well as relevant measures to deal with hidden dangers.
Simplified analysis method considering shear-lag effect of steel-concrete composite decks
Authors: Xu Huitong , Gu Jinzhu , Ma Qi , Li Xuan , Zhao Xu
Published: December 2019

In the wide-plate steel-concrete composite decks, concrete slab and the flange of steel box girder will have obvious warping deformation under the influence of steel beam webs. This mechanical behavior is called the shear lag effect and is usually obtained by utilizing the effective width. Therefore, a simplified calculation method based on effective width is proposed to analyze the shear lag effect of composite bridge decks, which would greatly improve the process of the design analysis in the general beam element model. In this study, the static load test of composite twin I-girder deck and box-girder deck specimens is carried out. In the experiment, two specimens were subjected to vertical bending load and axial compression load. In addition, a finite element model is established to analyze the shear lag effect of composite sections. Through the analysis of the fine element model of the composite deck under vertical bending load and axial compression load, the longitudinal distribution characteristics of the effective width are obtained. Moreover, the effective width prediction formulae are proposed. Finally, based on the general beam element model, considering gravity load, traffic load envelope and prestressing load, the simplified analysis method of composite decks for the design process is performed by comparative analysis.
Structural Analysis on Extra-High Voltage Engineering’s Pressure Factors
Authors: Ni Hui-jun , Zhi-shuang  , Zhou Chang-chao
Published: December 2019

From view point of building Extra-High Voltage Engineering, the paper discusses the key pressure factors on carry out engineers. The field research from grid enterprises shows that craftsmen, artisans and mechanics all can significantly affect project quality and project delivery time. This research provides useful tools for Extra-High Voltage Engineering’s implement and management through the power of the key pressure factors by enterprise’ examples of craftsmen.
Test study on the load transfer behavior of the composite foundation of pipe-pile with cap & holes
Authors: Zou Yongqiang , Lei Jinbo , Zhou Xing , Yang Jinyou
Published: December 2019

As the vertical reinforcement of composite foundation, the concrete pipe pile is suitable for the treatment of deep soft foundation engineering. In order to explore the working characteristics of the composite foundation of pipe-pile with cap & holes, the model tests have been carried out between the composite foundation of pipe-pile with cap & non-hole and the composite foundation of pipe-pile with cap & holes, which are three arrangements of holes. The working properties of settlement deformation, load transfer and the pile-soil stress ratio of the composite foundation of all piles have been analyzed. The test results show that: (1) the total settlement of composite foundation of pipe pile with cap & holes is smaller than that of the composite foundation of pipe pile with cap & non-holes, and its settlement curve is relatively gentle.(2)The pile axial force and the pile-soil stress ratio of the composite foundation of pipe-pile with holes is slightly less than that of pipe-pile. (3)The pile side frictional resistance and the soil pressure between two pile caps of the pipe-pile with holes is greater than the pipe-pile with cap & non-holes composite foundation.
Exploring the influence of project manager leadership on the success of green building——Based on multi-group structural equation model
Authors: Liu Jinjian , Sang Peidong , Zheng Lingqiao
Published: December 2019

The project manager’s leadership is a key to the success of construction project. With the further worsening of environmental and energy problems, the development of green building has become an inevitable trend. There are little studies on project manager leadership evaluation based on green building project. Through literature review and group discussion, the key success indicators, project manager leadership style and 14 leadership indicators were determined. The hypothesis test was verified by questionnaire survey and multi-group structural equation model. The results provide a theoretical basis for selecting excellent project managers for green building projects.
Effect of Shield Tunnel Construction on Surface Deformation in Changzhou
Authors: Li Xiongwei , Ju Shangwei , Wang Yuezhong , He Liang
Published: December 2019

The test section of Changzhou North Railway Station of Rail Transit Line 1 is taken as the engineering background. It is before the shield tunnel passes through the Beijing-Shanghai high-speed railway. With software of PLAXIS 3D, the numerical simulation on surface deformation is conducted considering the influence of shield tunnelling, based on the M-C. HS and HSS model. The calculated results of the three models are compared with the monitoring data. It is shown that the HSS model is optimal. In addition, the applicability of 0.5% and 0.8% for the loss rate of shield tunnelling in Changzhou is studied. It is reasonable to adopt 0.5% stratum loss rate for general shield tunnel conditions. But, sometimes in order to consider the special conditions such as deviation rectification construction, stratum loss rate should be set at 0.8%.
Research on Gentle Slope Design Index of Continuous Downhill Slope Section of Mountainous Highway
Authors: Zhao Yifei , Ding Jiahui
Published: December 2019

In order to ensure the safe driving of heavy trucks, the mountainous highways have stipulated the average longitudinal slope and slope length of continuous downhill slopes. For the continuous downhill sections, the necessity of gentle slopes exists, and it is proposed to meet the average longitudinal slope conditions. The gentle slope and slope length index have certain guiding significance for the design of the longitudinal section of continuous downhill section controlled by the average longitudinal slope index. In this paper, the relationship between the running speed characteristics of the downhill truck and the slope of the vertical slope and the traffic accident rate are analyzed. The FAW Jiefang J7 tractor CA4250P77K25T1E5 with the total weight of 48.805t and the power quality ratio of 7.58kw/t is selected as the leading model, based on the downhill slope. Reduce the speed, combined with the braking performance curve of the slow-slope section of the dominant model, the research shows the design index of the downhill gentle slope.
The Adaptability of Passive Design Strategies for Public Buildings in Shenzhen
Authors: Liu Lei , Li Shenghan
Published: December 2019

In recent years, with increasing demands of improving public indoor environment for living in a more comfortable manner, a large number of mechanical equipment are applied to public buildings, making public buildings be major energy consumers in civil buildings. Passive technology is an effective way to design buildings of energy saving strategies. Therefore, this paper summarizes the overall energy consumption of public buildings in Shenzhen by collecting and analyzing statistical data through Shenzhen Statistical Yearbook over the years. Besides, using Ecotect’s sub-software “Weather tool” to analyze the local meteorological environment. Through the analysis of the psychrometric chart to get the different energy-saving potential used the specific six passive design strategies, the results have shown that the best combination of passive design strategies suitable for climate conditions are natural ventilation, passive solar heating, and thermal heating. Finally, these three passive design strategies are further analyzed and discussed to obtain the feasible schemes, which could provide constructive suggestions for passive energy-saving design of public buildings in Shenzhen.
Analysis of bending failure process of RPC100 foot-slabs
Authors: Zheng Weilong , Yuan Shengtao , Hu Chuanwen , Luo Wenbo , Xie Shoufu , Chen Shunchao
Published: December 2019

In order to study the failure modes of RPC100 foot-slabs, three pavement plates with the same calculated span were used for the uniaxial bending experiment. Meanwhile, the failure process of three groups of ordinary reinforced concrete was compared. The test showed that: during the experiment, the failure process of the two was basically the same, and RPC100 showed a certain ductility. So RPC100 foot-slabs was a plastic material.
Comparative test and analysis on flexural behavior of RPC100 foot-slabs
Authors: Zheng Weilong , Yuan Shengtao , Hu Chuanwen , Luo Wenbo , Xie Shoufu , Chen Shunchao
Published: December 2019

In order to judge normal service condition of RPC100 foot-slabs, and study its application value in practical engineering. In this paper, the crack bending moment of RPC100 and ordinary reinforced concrete is compared by using the test method of hydraulic jack single point centralized loading simply supported plate, which combines with the test data of macroscopic observation, deflection and strain. The results show that the safety coefficient of RPC100 furrow cover applied to the pavement is greater than 1.8, which is in a safe state and can meet the demand for carrying capacity of the sidewalk in normal use.
Visualization Analysis of BIM Research Hotspot and Evolutional Trend
Authors: Liu Yanqi , Liu Xinnan , Zhao Likun
Published: December 2019

Building Information Modeling (BIM) has gained rapid development and received broad worldwide attention among researchers and architects. To grasp the research progress of BIM is of great significance for researchers and enterprises engaged in BIM related studies and plotted a science knowledge map by with the visualization tool CiteSpace, and used biliometric analysis to compare BIM studies published from 2008 to 2018 in China and abroad from three perspectives: knowledge base, research hotspot and evolutional trend. The research result shows that BIM studies abroad focus on interdisciplinary fields, but Chinese BIM studies focus more on application of BIM technologies in actual projects. Research on integration of BIM with Internet, big data, cloud computing and other information technologies is bound to become a new research trend of BIM in China.
Study on The Staff Regularity and Building Energy Efficiency of High-star Hotel in Urumqi
Authors: Sun Wanqi , Zhang Haiyue , Zhang Xuefeng , Sun Wanqi
Published: December 2019

Urumqi is located in the arid area of Northwest China. Through field investigation, the author finds that the energy consumption of high-star hotels in Urumqi is large in off-season tourism, but the occupancy rate is low, which causes a lot of energy waste. According to the data analysis of law of indoor activity in each area of high star hotel in Urumqi, this paper puts forward that through building buffer space, according to the different function of building, different treatment should be carried out for different use frequency of building space. According to different use temperature requirements, the use space can be arranged from the inside to the outside in order to form a gradient space, and dividing the various areas of the hotel into heating space, transition space and temperature damping space can achieve the purpose of energy saving effectively.
Analysis and design of link slabs in jointless ramp viaduct
Authors: Xiao Yu , Bandara Theekshana , Dassanayake Anushka
Published: December 2019

Due to the internal and external movement of the bridge deck, it is necessary to provide expansion gaps between multi span bridge decks. However the water leaking and debris trapped in the expansion joints will cause high maintenance cost. Therefore an alternative to eliminate expansion joints is vital. This paper contains comparison between the 3D, 2D model and a manual analysis of a link slab in a curved ramp bridge. This link slab is modelled as Finite Element Model using SAP 2000 software as a global model with the superstructure model for the calculation of the global effect from temperature, shrinkage, and creep with live HA, HB loads and superimposed dead loads and the most unfavourable conditions are identified.
Water environment protection and monitoring management during bridge construction in water source conservation areas
Authors: Wang Xiao , Zhang Dong , Liu Huan
Published: December 2019

Pollutants generation links of wading bridge construction and the sources of waste water were summarized. Some effective measures were presented to prevent water from pollution and the surface water environment has been monitored upstream and downstream of Jinfeng Bridge, Hu kengcun Bridge and Niu Wukou Bridge. The monitoring results indicate that most monitoring items meet the II-level environmental quality standards of surface water. This good tendency is mainly due to the implementation of strict water resources protection measures during the construction process, which provide technical support for water environment safety of Qiandao Lake.
Applying BIM and 3D laser scanning technology on virtual pre-assembly for complex steel structure in construction
Authors: Ying Chunli , Zhou Yin , Han Daguang , Qin Guocheng , Hu Kaixin , Guo Jieming , Guo Tong
Published: December 2019

Steel structure needs to be assembled before the components are transported to the site to ensure the installation of the steel structure successfully. The traditional assembly is a physical assembly method, which needs an amount of equipment, occupies large areas and can be labor and time-consuming. To address these issues, industrial photogrammetry has been developed to acquire data, and the steel structure has been virtually assembled in a virtual environment. The high-precision data acquisition of steel components is now carried out by using 3D laser scanner, and therefore, the feature data of those components can be automatically extracted by programming. As a result, the accurate linear shape of the post-splicing components can be extracted after completing the precise assembly of the steel structure in a virtual environment, which is significant for the subsequent mechanical analysis.
Structural characteristics of mixed plantation of pinus massoniana and oak in danjiangkou reservoir area
Authors: En Liu , Chunqian Jiang , Xudong Zhang , Lianghua Qi , Lei Zhang , Zengwang Yao , Hui Wang , Yanfeng Bai
Published: December 2019

In this paper, the frequency distribution of DBH and DBH of masson pine and oak trees in mixed forest was simulated by using normal distribution, and the relationship between DBH and tree height was fitted by 11 common curve models. The power model can well simulate the relationship between DBH and tree height.
Detection and Reinforcement of A Bridge
Authors: Wang Yongwei
Published: December 2019

Combined with the disease situation of a certain bridge, through the longitudinal and transverse checking calculation of the bridge structure, after fully grasping the stress condition of the structure, a targeted reinforcement design scheme is developed, and the comprehensive analysis and checking calculation of the reinforced structure are carried out to confirm the reinforcement effect, which provides a reference for similar engineering design.
Preliminary Study on Green Building Design Review System Based on BIM
Authors: Ying Guo
Published: December 2019

Sustainable development is a common concern in today’s world. In the field of urban construction, it has also begun to develop from traditional high-consumption buildings to green and efficient buildings. Green buildings have become the main trend of world architectural development. From the perspective of design and application of architectural design review system, combined with the concept of BIM technology, green building design and related requirements, this paper proposes to use computer technology to build BIM building information model, and to construct spatial geometric information, functional information, building materials and Integrated management of equipment. Besides other related data provides relevant basis for the design of green buildings. At the same time, the formation of the green building design review system can realize the green building evaluation function by visualizing the three-dimensional data information.
Comparative Study on Development, Application and Benefit of Typical Electric Heating Projects in China
Authors: Zhao Baoguo , Xie Yan , Zhang Jian , Lu Xin , Yue Liang , Wang YongLi
Published: December 2019

In recent years, the continuous severe fog and haze weather in China has caused serious damage to people’s health. In order to make the public aware of the characteristics of electric heating, this paper first analyzes the technical scheme of electric heating and provides suggestions for the choice of electric heating mode. Then, taking a project in a certain area of North China as an example, from the aspects of annual cost, energy consumption, pollutant discharge, etc., the application of electric heating and other heating methods to analyze the economic, environmental and social benefits, and the overall benefit of electric heating is quantitatively evaluated. According to the evaluation results, some suggestions for the healthy development of electric heating are provided, which has important practical reference significance for the implementation of electric heating.
Study on the Reconstruction of Existing Bridges with Composite Structure
Authors: Yao Wen , Ma Jianxun , Zhang Yuchen
Published: December 2019

Cable-stayed bridges have their unique advantages, which are suitable for urban bridges with higher requirements for landscape improvement and upgrading. In the process of urban bridge renovation with landscape demand, the advantages of cable-stayed bridge in shape and structure are combined to provide more excellent scheme for urban bridge renovation. In this paper, the existing continuous girder bridge is reconstructed by adding cables. The internal force and displacement before and after structural renovation are calculated by Midas civil 2019. It can be seen that the internal force of the structure can be significantly improved by increasing the cables, and the maximum and minimum bending stress can be reduced by 40% and 20% respectively. Comparing and analyzing different retrofitting methods, the layout of cables has the most obvious effect on the maximum stress of the whole structure.
Study on the Variogram Analysis Methods of 3D Geological Modeling for Sandstone Reservoirs
Authors: zuowei Liu
Published: December 2019

Variogram analysis is a necessary step for 3D stochastic modeling. Different variogram settings will directly affect the final distribution characteristics of model attributes. Setting the variogram parameters on the optimization results of sedimentary types of sub-units has become a key step in geological modeling. In this paper, the influence of variogram parameters on the simulation results of reservoir properties is studied to improve the analysis method of the variogram. This paper is for typical river-delta sedimentary reservoirs, specifically taking the SII7+8 layers as the research object. Multiple sedimentary microfacies types, including river, abandoned river, floodplain, natural dyke, coexist and show highly heterogeneous in the SII7+8 layers. On this basis, the reservoir is divided into 3 types of sand bodies and 11 kinds of sedimentary microfacies according to the effective thickness, sedimentary conditions, scale and shape of main sand bodies to study the distribution characteristics and extension scale of different sedimentary types in plane, so as to determine the variogram parameters of different sand body types, and accurately simulate the reservoir property distributions. The process in variogram analysis methods can further improving the accuracy of 3D geological modeling.
Study on the Utilization of Vacant Houses in Rural Exurbs Under the Background of Rural Revitalization Strategy by Taking Shenjia Village in Hunan Province as an Example
Authors: Zhang Ying , Chen Zuzhan , Sun Hongkai , Zhang Shili , Liu Haoqian
Published: December 2019

Large-scale urbanization construction leads to a large number of idle rural houses, resulting in a waste of social resources. The rural revitalization strategy proposed at the 19th National Congress puts forward higher requirements for the construction of new socialist countryside. In order to solve the problems of the rural vacant houses, this article analyzes the necessity of current rural exurb construction and rural vacant house utilization from the perspective of social development and policies. By virtue of investigation on the problems of vacant houses in Shenjia village, Loudi city, Hunan province, this article puts forwards three modes, namely the rural pension mode, rural short rent mode and the home stay facility reception mode as countermeasures for utilizing the vacant houses. These modes with independence from large-scale investment and special geographical location and good universality are capable of getting rid of the large-scale demolition and reconstruction phenomenon of rural construction and servicing the national development strategy.
Studying on the characteristics of vibration effect of the blasting of excavating anchorage tunnels of Chishui River Super Bridge
Authors: Dan Zhang , Yong Guo , Caiying Zhen , Zheng Cheng
Published: December 2019

The section of anchorage tunnels, is large, there are variable contour and variable areas and small distance among anchorage tunnels and main tunnels, and easy to form unloading cracks or boulder to bias arch, so blasting excavation maybe easily damage the middle pillars and surrounding rock and to collapses the entrance of holes, which will affect the operation of bridge in the future. For the structure, spatial distribution state of anchorage tunnel and the highway tunnels, and spatial relationship among its, based on the topographic feature, geological structure, rock and lithology of the Sichuan bank of Chishui Rive Super Bridge, according to the correlation between blasting source factors and the energy density distribution characteristic of blasting seismic wave, combined with monitoring, the blasting vibration effect characteristics of tunnel anchorage excavation are studied on, the blasting technology is optimized, and the support are strengthen to ensure the stability of the surrounding rock, middle pillar and mouth, so that the construction will be done successfully.
Temperature and humidity characteristics of residential buildings in northern China
Authors: Zhou Jinjun , Chu Qi , Zhang Yongxiang
Published: December 2019

Buildings are one of the typical underlying surfaces of cities, but the study of hydrological effects of buildings is a weak link in urban hydrological research. Indoor temperature and humidity are important embodiments of the hydrological effect of building water activity. Beijing, as the capital of China, is selected as the representative research area in north China. The variation characteristics of temperature and humidity of residential buildings, as well astheir relationship with each other, are analyzed through experimental monitoring. The result showsthat human water use activities in buildings will increase indoor humidity. The indoor humidity is higher than the outdoor humidity in the sunny days of spring, summer andwinter, while it is lower than the outdoor humidity through rainy days and the whole autumn. Both indoor and outdoor humidityreach peak and nearly the same at night, but the difference between the indoor and outdoor humidity is obvious during the daytime. Based on the results we can draw the conclusion that (1) indoor water use activities canproduce obvious water vapor diffusion; (2) In northern China, the indoor humidity of the residential buildings is higher than the outdoor humidity, and will flow to outdoors during most sunny days; (3) among all the types of the rooms in the resendital building, bathroom is the largest contributor to water vapor dissipation. We suggest that water vapor dissipation in buildings should be taken into account in the study of evaporation in urban areas since it may profoundly affect the urban hydrological cycle.
Opening Angle and Impact Force Analysis of Different Types Flap Valve in Pumping Stations
Authors: Wang Zhixiang , Du Yueting
Published: December 2019

Based on the energy method, the motion equation of the flap valve is deduced. Combining with the example of Bailizhou Pumping Station, the opening angle and impact force of the flap valve with different forms of installation (free rollover, free suspended, covers), different valve pages ( single-leaf and double-leaf ) and different materials ( steel and composite materials ) are analyzed and calculated. Under the same conditions, the results show that: for single-block flap valve of different installations, opening angle of free rollover flap valve is bigger than free suspended flap valve at 22°, and bigger than cover flap valve at 12°, impact force of three installation forms flap valve is close. For different valve pages, opening angle of double-leaf flap valve is slightly larger than the single-leaf, impact force of free rollover double-leaf flap valve is 42% of the single-leaf, and cover double-leaf flap valve is 49% of the single-leaf. Comparing different materials, opening angle of free rollover composite flap valve is 4% bigger than the steel flap valve, its impact force is 9.6% smaller than steel flap valve, and opening angle of free suspended composite flap valve and cover composite flap valve is 10%∼15% bigger than their steel flap valve, impact force of free suspended composite flap valve is 39.5% smaller than the steel flap valve, and cover composite flap valve is 28.5% smaller than the steel flap valve.
The Influence of Layout on Energy Performance of University Building
Authors: Dai Jin , Jiang Shuguang , Li Jie , Xu Xin , Wu Mengyun
Published: December 2019

This paper analyzes the impact of the layout of university building architectural design on the annual energy consumption of the south and north classroom in the severe cold regions of Xinjiang. The aim is to reduce the waste of energy in university buildings and promote sustainable energy and environmental development. Using the Shihezi meteorological data, the energy performance of the four university architectural design layouts proposed by the hypothesis was numerically simulated by Energy Plus, and the results obtained were compared and analyzed. Through research, the atrium has the greatest impact on the energy consumption of the classrooms inside the building. The most energy-efficient university building layout is designed with an Inside corridor. Energy-efficient and sustainable solutions are designed to meet the energy needs of the classroom through the layout of the building.
Study on the Performance of Box-Shaped Steel Columns under Blast Loading
Authors: Jia Geng , Guijuan Qian , Xiaotong Peng , Taochun Yang
Published: December 2019

To study on the performance of box-shaped steel columns with fixed end constraints under blast loading, the dynamic response of box-shaped steel columns under different loading conditions is analyzed through ANSYS/LS-DYNA software. Moreover, the change process of stress, deformation, as well as failure model is studied. Meanwhile, parameter analysis method is used to assess the influence of blast loading and width-thickness ratio on the failure model and dynamic response. The results show that local deformation is a significant feature of thin walled box steel columns under blast loading. With the increase of width-thickness ratio, the column lateral displacement is increased under blast loading. Reasonable design of influence parameters can ensure that box shaped steel columns have better blast-resistant ability.
Numerical Investigation of Pallet Structure with Annular Slot in MOVPE Chamber
Authors: Li Zhiming , Lu Ligen , Li Hailing , Guo Runqiu , Feng Lansheng
Published: December 2019

A pallet structure with an annular slot is proposed in the perpendicular MOVPE chamber by electromagnetic heating Compared with the conventional pallet, the shape of the slot changes the directions of the thermal conduction in the pallet, which makes the temperature distribution of the substrate more uniform. The optimized pallet structure which makes the most uniform temperature profile of the substrate is also given. In addition, the intervals of the applied parameters such as the current frequency, current strength and coil turns which keep the stable change of the substrate temperature are also obtained, by analyzing the change of the substrate temperature with the parameters. When one of the parameters is changed in the interval, the temperature magnitude can be adjusted while ensuring a certain uniformity of the temperature. This is beneficial to control the growth of the thin film.
The Determination of Optimal Time for Bridge Preventive Maintenance Based on Particle Swarm Optimization Algorithm
Authors: Wang Wei
Published: December 2019

This paper constructs the full life cycle cost model, durable life extension and maintenance period mathematical model for preventive maintenance of bridges, and introduces software to calculate the multiple regression equation of maintenance effects to durable life extension years and maintenance costs. Particle swarm optimization algorithm is used to select the best time selection model for comprehensive and integrative control of three targets including preventive maintenance effects, maintenance costs and durable life extension of bridges.
Comparison of Hangers’ Tensioning Sequence of Diagonal-span Arch Bridge
Authors: Qi Qin , Wang Hongfei
Published: December 2019

The Diagonal-span arch bridge is novel in shape and complicated in force. In order to ensure the safety of the bridge during the tensioning of the hanger, Midas Civil was used to establish a three-dimensional finite element model and four kinds of tensioning scheme are compared. This study analyses the deformation and stress of arch rib, girder and hangers to determine a reasonable tensioning sequence. The results show: On the basis of satisfying the lateral stability of the arch rib, the tensioning sequence from the two sides to the middle have the smallest stress and reasonable deformation. This study can provide reference for similar bridges.
Simulation-Based Speed-Density Relationship Model of Highway Interchange
Authors: Liu Yanwei
Published: December 2019

To study the law of traffic wave transmission in highway interchange, this study analysed the traffic characteristics of the interchange section, developed an improved speed-density model of highway interchange based on 5PL logistic model by modifying the turning density and the mixing rate coefficient. The correction coefficients Δ1, Δ2 related to the traffic of the ramp were introduced and quantified by the nonlinear fitting and multivariate linear regression analysis of the simulation data under different traffic volumes combinations. The actual operation data of the interchange section was collected on site, and the difference between the calculated value and the actual value of the model was compared to verify the correctness and versatility of the model.