bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influencing Factors Analysis of Ammunition Storage in Reef Environment and Countermeasures
Authors: Chao Song , Zhiqiang Li , Weichao Si 
Published: July 2020

Abstract
To explore the characteristics of ammunition storage environment in islands of West China Sea and South China Sea and the mechanism of environmental factors affecting ammunition quality change and propose countermeasures, the characteristics of high temperature and humidity, high salt spray and ammunition storage in the sand islands and reefs in southwest China were analysed. During the process of ammunition storage in the west and south China sea islands environment, its quality is affected by many complex factors, among which temperature, humidity and salt fog are the most important factors that result in the change of ammunition quality. For the environment characteristic and the actual situation of the reef storage, some measures are put forward by increasing environmental monitoring equipment and accurately recording the environment parameter, improving the ammunition storage surrounding natural environment, strengthening warehouse construction to improve the heat insulation and moisture proof ability, and strictly implementing the storage environment inspection. The countermeasures proposed can effectively improve the quality of ammunition storage, prolong the life of ammunition and ensure the reliability of ammunition.
Dynamic Cooling Load Calculation of Heat Transfer through the Envelope for Cold Storage
Authors: Xuejin Wang , Yujing Zhang , Jing Hong 
Published: July 2020

Abstract
The dynamic heat transfer method is adopted, the mathematical model of reaction coefficient method is established and programmed, and a very practical dynamic load engineering algorithm for the wall of cold storage is obtained, which will provide reliable basic data for the continuous automatic regulation and energy saving control of the whole system dynamic real-time load of the cold storage. The calculated heat flow is much smaller than the current heat flow calculated according to the code insulation, and the maximum heat flow is much smaller than the current heat flow calculated according to the code insulation. The method presented in this paper can also be applied to the design and check of the thickness of the insulation layer and the analysis of the wall condensation in the wall system of the cold storage.
Dynamic Load Calculation of Solar Radiation Heat Gain for Energy-saving Buildings Envelope in Winter
Authors: Xuejin Wang , Yujing Zhang , Jing Hong 
Published: July 2020

Abstract
The paper analyzes the influence of solar radiation load for energy-saving building in winter, considering the thermal inertia of building envelope, a mathematical model of unsteady heat transfer is established, and a program is compiled to calculate the dynamic solar radiation load of building envelope in winter, which is a very practical calculation of solar radiation dynamic load. It not only changes the current situation that the calculation of solar radiation load in winter for energy-saving buildings can only use the steady-state algorithm, but also provides scientific and reliable data support for thermal comfort and the dynamic analysis of heating energy consumption for energy-saving buildings.
Study on human responses under different CO2 concentration and illuminance in underground refuge chamber
Authors: Tu Zhijun , Geng Shibin , Li Yong 
Published: July 2020

Abstract
Due to insufficient ventilation and absence of daylight, underground confined environment will be dim and occurred with high CO2 concentration. It is essential to clarify the combined effects of high CO2 concentration and illuminance on human responses in confined spaces. Twenty-four subjects were exposed to different combinations of illuminance and CO2 concentrations in an underground climate chamber, with thermal responses, physiological responses and acute health symptoms being investigated. Results show that: at CO2 level of 12,000ppm, heart rate (HR), diastolic blood pressure (DBP) and ratings of acute health symptoms (dizziness, agitation and depression) increased significantly when illuminance level was up to 500 lux. However, no similar results were observed at a CO2 concentration of 8000 ppm. Additionally, thermal sensation votes (TSV) increased significant with increasing illuminance level, regardless of CO2 concentration being 8000 or 12,000 ppm. Similar result was obtained for the change of thermal comfort votes (TCV) at CO2 level of 12,000 ppm. However, TCV result for illuminance level of 100 and 500 lux did not show a significant difference at CO2 concentration of 8000 ppm. This indicated that the combined effects of illuminance and high CO2 concentration lead to different human responses.
Experimental study of post-fire mechanical properties of a light prefabricated composite slabs
Authors: Qi Shen , Zhiheng Meng , Xintang Wang 
Published: July 2020

Abstract
The post-fire mechanical performance of a prefabricated composite slabs consisting of thin-walled steel beams with opening in web and lightweight aggregate concrete was experimentally studied, and the displacements of the composite floor specimens was discussed. The experimental results showed that the composite floors after fire had better plastic deformation capacity and greater residual bearing capacity. Type of the shearing keys, pull pieces between the precast concrete panels and the connection way of shearing keys to pull pieces had greater effect on the post-fire mechanical property of the composite slabs.
Study of post-fire mechanical behaviours of the light prefabricated composite floors after fire
Authors: Zhengguo Pan , Zhiheng Meng , Xintang Wang 
Published: July 2020

Abstract
The post-fire mechanical properties of a prefabricated composite slabs consisting of thin-walled steel members and lightweight aggregate concrete was experimentally studied, and the displacements of the composite floor specimens was discussed. The experimental results showed that the ultimate load of the composite slab specimens after fire with using the stud shearing connectors was greater than that with using the new type shear keys made with thin-walled steel plate. The global stiffness and load-bearing capacity of the composite slabs after suffering hydrocarbon fire can be effectively improved by increasing the wall thickness of transverse sub-members appropriately.
Study of post-fire mechanical properties of the light composite slabs after suffering hydrocarbon fire
Authors: Yixiang Hao , Zhiheng Meng , Xintang Wang 
Published: July 2020

Abstract
The post-fire mechanical behaviours of the composite floors consisting of lightweight aggregate concrete and thin-walled steel members were experimentally studied, and the test result of the composite floor specimens was discussed. The experimental results showed that the residual load-bearing capacity of the composite slabs after suffering hydrocarbon fire can be effectively improved by increasing the wall thickness of transverse sub-members appropriately. The ultimate load of the composite slab specimens after fire with using the commonly used stud shearing connectors was larger than that with using the shear keys made with thin-walled steel plate.
Study on early dynamic mechanical properties of inorganic polymer based fast hardening concrete
Authors: Zhang Hengbo , Xu Jinyu , Luo Xin , Nie Liangxue , Wang Yanan 
Published: July 2020

Abstract
For the purpose of explore the early dynamic mechanical properties of inorganic polymer based fast hardening concrete (IPFC), two groups of IPFC specimens were prepared with slag and silica fume as the main raw materials, flake alkali and water glass as alkali activators: slag based fast-hardening concrete (SFC) and silica fume-slag based fast-hardening concrete (SSFC). The dynamic mechanical properties of specimens at the age of 3 hours were studied by Φ 100 mm split Hopkinson pressure bar (SHPB) test device. The results show that, the dynamic compressive strength and peak toughness of SFC and SSFC both have obvious strain-rate sensitivity, and the peak stress of SSFC is higher than that of SFC, while the peak toughness is lower than that of SFC overall; The peak strain of SFC and SSFC shows no rate dependence, and the peak stress changes little with strain rate in the range of 30 to100 s−1, the peak strain of SFC is generally higher than that of SSFC.
Study on mechanism of electromagnetic shielding effectiveness of carbon nanofibers reinforced cement concrete
Authors: Zhang Hengbo , Xu Jinyu , Wang Han , Nie Liangxue 
Published: July 2020

Abstract
In this paper, five groups of cement concrete specimens reinforced by carbon nanofibers (CNFs) were prepared with different fiber content of 0%, 0.1%, 0.2%, 0.3% and 0.5%, the electromagnetic shielding effectiveness (SE) and the mechanism of shielding were analyzed. The results show that, when the frequency of electromagnetic wave is higher than 2 GHz, with the increase of frequency, the improvement gradually increases; When the frequency is 18 GHz, the SE reaches the maximum; CNFs can improve the SE of concrete material by improving its conductivity and the loss of electromagnetic wave.
Analytical Method for Local Damage of Beams under Moving Vehicle Loading
Authors: Wang Guizhong 
Published: July 2020

Abstract
In order to accurately identify damage of bridge under natural excitation, an analytical solution of local stiffness of simply supported beam structure is established by using structural mechanics method through establishing the moving load model of simply supported beam. On this basis, an accurate identification method of local damage of beam structure under vehicle load is proposed. Firstly, the local bending stiffness is described in terms of equal length intervals. Secondly, the corresponding loading methods are established for single concentrated load and two-axle vehicle respectively, and the local bending stiffness values of each interval are solved by analytic equation established by node displacement. Damage information can be identified by comparing the flexural stiffness values of simply supported beams before and after damage. Based on the discreteness of local bending stiffness of simply supported beams and the change of local bending stiffness caused by damage, the location and degree of local damage of beams can be accurately identified.
Correction and Regularity of Influence Coefficient for Double-Line Tunnel Settling
Authors: Shang Yanliang , Dang Hongqian , Zhang Yunxia , Li Qiang 
Published: July 2020

Abstract
In the construction of most double-tunnel subways and postexcavation tunnels, settlement deformation is an important problem. In this study, we analyzed the problem using monitoring data from the Huai’anqiao-Xisanjiao section (an anhydrous sand layer) of the first phase of China’s Shijiazhuang Rail Transit Line 3 project. First, FLAC3D software was used to establish a numerical model. Grouting pressure was assumed to be uniformly distributed. The settlement value of a measured point was calculated as the test data, and the range of the correction factor was obtained by an influence coefficient formula. The correction factor was revised in accordance with the measured data, and the correction factors for the properties of Shijiazhuang sand were obtained. For the first tunnel measuring point, the correction factor was –0.2; for the rear of the tunnel point the correction factor was 0.2. Finally, different numerical models were established, and the influence on the correction factor of such factors as tunnel depth and horizontal spacing, slope ratio, and tunnel spacing were established by using a control variable method.
Free vibration analysis of shield cutter head using element-free method
Authors: Shang Yanliang , Dang Hongqian , Zhang Yunxia , Li Qiang 
Published: July 2020

Abstract
Free vibration of cutter head is very important to the shield tunneling machine in design, manufacture and construction. It is a free vibration problem of simply-connected circular plates with clamped supported boundary. In this paper, a element-free key to solve the problems of cutter head vibration by the Radial Basis Function is put forward. In order to save the computational time, the real-part MFS is used to carry out the mathematical analysis which is different from the previous complex value calculation. For the cutter head, the eigenequations were obtained by analytic deduction using the discrete element-free model. It is found that the spurious eigenequation relies on the equations employed, but the true eigenequation is related to the boundary conditions. By using Burton & Miller methods, the true eigenequation was extracted. A numerical case of clamped cutter head was adopted to valid the effectiveness of the present method.
Experimental study on bearing capacity of single steel pipe column for fully united framework
Authors: Zhang Wenwen , Liu Ping , Liu Liangliang , Yang Jianjiang 
Published: July 2020

Abstract
It is analyzed and tested the substitution of triangular section columns for single steel outgoing line columns in the 500kV fully united framework based on the design, test and analysis with 18 specimens of single steel pipe. The theoretical calculation method of bearing capacity is put forward by analyzing the design theory. Through the experimental analysis and research, the computational model with bottom fixed, middle hinged and top hinged is obtained, which is consistent with theoretical values, thus providing valuable reference conclusions for the revision of the specification. It provides meaningful theoretical and experimental data for the analysis and calculation of substitution of single steel pipe outgoing line column for the original triangular section outgoing line column for the 500kV fully united framework.
Experimental Research on Temperature Field of Large Diameter Concrete-Filled Steel Tube Section
Authors: Liu Dianyuan , Qi Tiedong 
Published: July 2020

Abstract
In order to research the influence of solar radiation on temperature field of large diameter concrete-filled steel tube (CFST) section, the field test of temperature field of CFST section was carried out based on the reconstruction project of Huaihe River Bridge in Xi County, Xinyang City, Henan Province. For the asymmetric temperature distribution of concrete-filled steel tube sections caused by sunlight, considering the environmental factors and the actual position, temperature field of CFST section under sunshine was analyzed by finite element method, and the results are compared with the field test results to verify the reliability of the model. The analysis results show that the non-uniform distribution of the CFST with large diameter appears due to the sunlight effect; the larger the size of core concrete, the slower the change of central temperature, and the greater the temperature difference between the core and the boundary. Therefore, the influence of sunshine effect should be considered in the actual engineering.
A review of researches on lighting energy saving technology methods for highway tunnels
Authors: Chen Mingyang , Wang Qianyue , Zhen Jiangming , Xie Wenjing , Li Qi , Wu Yue 
Published: July 2020

Abstract
Lighting accounts for a large proportion of energy consumption in highway tunnels. In the context of the “low-carbon economy” and “energy conservation and emission reduction” strategies, this article starts from designing energy conservation, and discusses energy saving of light sources, lamp arrangement, control system, and auxiliary lighting. It summarizes the related research results, and puts forward some insights on the future energy saving design of highway tunnel lighting in China, and provides a reference for highway tunnel lighting design.
Comparative analysis of bearing characteristics between triangular columns and variable-section columns
Authors: Zhang Wenwen , Zhang Lianli , Liu Liangliang , Yang Jianjiang 
Published: July 2020

Abstract
Fengnan 500KV substation fully united framework was taken as the engineering background for analyzing the effect of load on the bearing characteristics of triangular frame columns and variable-section steel columns under different working conditions. Through ANSYS simulation, the bearing characteristics of the two structures under the same working conditions were obtained. The possibility of replacing the original triangular frame column with a variable-section frame column in a 500kV fully united substation frame was analyzed.
Considering the stress deflection of foundation pit unloading soft soil study on deformation characteristics
Authors: Qiujuan Zhou , Zhongxiang Liu , Xiaoping Chen , Siyan Fang , Lijia Ma 
Published: July 2020

Abstract
The deflection of the main stress caused by the unloading of the foundation pit is bound to change the stress state of the surrounding soil and produce deformation. By analyzing the stress state of the surrounding soil after the foundation pit excavation and introducing the stress ratio vector, the soil constitutive model considering the stress deflection is derived. The constitutive model shows that: After excavation and unloading of foundation pit, the strain of surrounding soil is not only affected by the change of stress, but also closely related to the deflection of principal stress axis, and then the influence of different azimuth on the deformation characteristics of unloading soil is discussed by static shear test with different azimuth of principal stress axis. The test results show that: When the azimuth Angle of the principal stress is between 0° and 45°, the shear strength of the soil sample decreases with the increase, and the strain increases with the increase. At 45°∼75°, the shear strength of soil samples increases with the increase, and the strain decreases with the increase. The variation of the deformation modulus of the soil samples under different azimuths of the principal stress is like a “scoop” curve, which is mainly the reflection of the anisotropy of the soil, and shows strong anisotropy at 0°∼15°. By normalizing the stress-strain relationship curves of soil under different azimuth of principal stress, it is found that the strain of soil is not only related to stress, but also affected by the change of principal stress direction. The experimental results are in good agreement with the constitutive model proposed in this paper.
Leakage Detection of CFRDs Based on a Multi-source Information Fusion Method
Authors: Tian Jinzhang , Gao Dashui , Xu Yi , Zhu Yantao , Huang Lixian 
Published: July 2020

Abstract
Dam leakage is one of the most important failure causes of concrete face rockfill dams (CFRDs). Causes of dam leakage problems are various and hard to target due to the non-homogeneity of dam materials and the multi-dimensional deformation of CFRDs. This paper effectively performs multi-source information fusion of the safety monitoring, underwater sonar scanning, underwater high-definition cameras, and connection tests to propose a method for seepage detections of concrete face rockfill dams. The proposed method has been successfully applied in the seepage detection of a CFRD.
Time-varying Flexural Reliability Analysis of RC Beams Strengthened with SNSM CFRP under Environment Effects
Authors: Zewen Zhu , Li Dai , Lin Mao 
Published: July 2020

Abstract
In order to evaluate the influences of environmental effects on the reliability of reinforced concrete (RC) beams strengthened with side near surface mounted (SNSM) carbon fibre-reinforced polymer (CFRP), combined with the relevant research results and the actual parameters of strengthened beams, the time-varying functions of the flexural capacity of the strengthened beams considering environmental effect was established. Then, based on the JC methods, the time-varying flexural reliability of RC strengthened beams under different ratios of standard values of dead load and live load was calculated. The results showed that the flexural reliability of RC beams decreased slowly with service time in the early period, and decreased rapidly in the later period. Compared with unstrengthened beams, the reliability of strengthened beams had been improved to a certain extent. When the unstrengthened beams were serviced 70% of the base period T, and then it could continue to be serviced about 16% of the base period T after been strengthened with SNSM CFRP. In general, the SNSM CFRP technique could improve the service time of RC beams. According to the analysis results, it was recommended that the RC beams should be strengthened in the early period to better improve the service time.
Influence of High Damping Rubber Bearing on Seismic Performance of The Bridge
Authors: Yan Yang 
Published: July 2020

Abstract
Based on the qingyijiang bridge of ya’an-kangding expressway in Sichuan province, the influence of high damping rubber bearing on the seismic performance of the bridge is analyzed from the aspects of structural natural vibration period, internal force at the bottom of the pier, displacement at the top of the pier, displacement at the end of the beam and shear displacement of the bearing. The results are compared with those of ordinary rubber bearing. Some suggestions are put forward for its applicability on conventional highway bridges.
Discussion on The Design of Water Blocking and Drainage Limit of Water-rich Mountain Tunnel in Ecologically Fragile Area
Authors: Zhang Zhien , Huang Mingli , Huang Jiefang 
Published: July 2020

Abstract
In mountainous areas with abundant groundwater and high water pressure, the design of waterproof and drainage is the most important part of the whole tunnel construction process. Improper treatment of groundwater will not only damage the local ecological environment, but also bring hidden danger to the safety of tunnel structure, especially in the ecologically fragile area. The tunnel project under construction in the East Tianshan Mountain is located in the high-altitude mountain area. The surface is the national forest protection area, and the vegetation is perennial. Once a large amount of groundwater is lost, the surface ecology will be damaged and hard to recover in a short time. In this paper, the existing design of mountain tunnel waterproof and drainage is summarized, and its advantages and disadvantages are analyzed. Based on the previous research, the concept of waterproof and drainage design suitable for the East Tianshan tunnel is proposed: “one block, two rows and Three Preventions”. “One block” is a circle of grouting outside the tunnel to block most of the groundwater. “Two rows” is to set two layers of drainage pipe network between shotcrete and waterproof layer and between waterproof layer and lining. “Three proofing” is to use three layers of water proofing: shotcrete layer, special waterproof layer and lining concrete. Layers of fortification can minimize the interference to groundwater and ensure the safety of tunnel structure.
Life Cycle Cost Analysis of Medium and Small Span Steel-Concrete Composite Bridges in Jiangxi Province
Authors: Li Dai , Zewen Zhu , Xianglin Jiang 
Published: July 2020

Abstract
This paper investigates the structural form, scope of application, construction technology, management and maintenance measures of steel-concrete composite bridges. Then based on the construction conditions of highway bridges in Jiangxi Province, life cycle cost of steel-concrete composite bridges is analyzed. The economics of short and medium and span steel-concrete composite bridges and concrete bridges are compared from the perspective of life-cycle cost.