bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of alternating stray current on chloride transport in cement-based materials
Authors: Tang Mengxiong , Hu Hesong , Zhu Wen , Zhao Ruying , Zhang Yanli , Luo Kun , Wu Jiang , Zhang Shuo 
Published: June 2021

Abstract
A series of tests were conducted to investigate the effects of alternating stray current on chloride transport in cement-based materials (mortar). The chloride distributions in the mortar after the conditioning of immersion in 35 g/L NaCl solution or coupled with direct/alternating stray current within 14 days were gained. Test results show that: (1) The distribution of chloride ions along the depth in mortar shows an exponential shape, after the conditioning of immersion in 35 g/L NaCl solution or coupled with direct or alternating stray current within 14 days; (2) Comparing with the immersion in the NaCl solution without stray current, the transport of chloride in the mortar under DC electric field is significantly accelerated. The maximum chloride content in the mortar under this environment was almost seven times higher than that in the condition without current; (3) The chloride contents at different depths of the mortar in the AC electric field are slightly less than those in the solution without electric field and are much less than that with direct stray current.
The uses of FR and QWL for site effect
Authors: Tao Z , Liu S , Tao X , Cao Z 
Published: June 2021

Abstract
For an engineering site without strong motion records, the effect of full resonance (FR) and quarter-wavelength (QWL) to evaluate site response is discussed by comparing the predicted ground motion at each interface with the analytical solution of the frequency-wavenumber (F-K) method. We analyse the differences of time histories and amplitude spectra, with the inputs of full wave and upward wave on the buried bedrock. By comparing with the F-K result, the input of upward wave is reasonable. A solution to extract upward wave from full wave is presented and proved.
Ultimate capacity analysis of transmission tower line system under wind load
Authors: Zhu Yang , Zhang Xin , Xie Qiang 
Published: June 2021

Abstract
As an important part of the large complex lifeline system, the transmission tower line system has many accidents. Based on the static and dynamic calculation theory, the response of the structure is analyzed, the ultimate capacity of the transmission tower system is obtained, and the weak position is studied, and the ultimate capacity of the transmission line is comprehensively evaluated. The result shows that the weak position is Segment 4 and 5 of the transmission tower, and the ultimate capacity of dynamic analysis is smaller than that of static analysis.
A new snow removal device and determination of for membrane structures
Authors: Wang B S , Zhang Y K , Meng L , Li S , Zhang H , Song Q H 
Published: June 2021

Abstract
In order to avoid the damage of membrane structure caused by snow load, a new type of intelligent snow removal device is proposed based on the principle of micro-spray irrigation and the dual control of pressure and temperature. The determination method of construction parameters such as pressure critical value, snow area, sprinkler size and number of the device is expounded. Finally, taking a Shanghai membrane structure project as an example, the snow area of the project was determined. Considering the size of snow area and the sprinkler spraying area, the number and construction location of the sprinklers on the membrane surface were finally determined.
Applicability analysis of squeezed branch pile with different embedded depth of Boulder
Authors: Wen-tong ZHU , Hai-qin LI , Jun-yan ZENG , Wei-dong GUAN 
Published: June 2021

Abstract
Based on Zhongshan-Tan zhou express 65 # pier boulder geological engineering landscape avenue viaduct, using PLAXIS3D to study in the different boulder embedment depth of squeezed branch piles expansion and common pile ultimate bearing capacity and the applicability of the squeezed branch piles expansion, the calculation results show that the squeezed branch piles expansion of P - S curve is slowly, the ultimate bearing capacity of pile is equal to the load value corresponding to the pile tip diameter when the pile settlement is 1/20, and the ultimate bearing capacity of pile foundation does not always increase(the peak point appears) with the increase of pile length, but the ultimate bearing capacity of ordinary pile is less than the ultimate bearing capacity of extrudated and expanded bracing pile. Under certain geological conditions, the pile length can be shortened and the bearing capacity of pile can be improved effectively. On the basis of the load of the upper bridge which satisfies the geological condition of boulder, the use of extrudated and expanded bracing pile instead of ordinary pile can effectively avoid the boulder, avoid the pile passing through the boulder layer, which can greatly save the construction period and reduce the difficulty of construction.
Analysis of the influencing parameters of double steel-plate composite shear wall
Authors: Xu Z P , Gao X L 
Published: June 2021

Abstract
The double steel plate concrete composite shear walls are widely used in nuclear power structures due to good bearing capacity, deformation capacity and radiation resistance. The shear walls of nuclear power structures are totally different with that in the civil buildings, which have the characteristics of small shear span to depth ratio and large thickness. On the basis of summarizing and analysing the test results of double steel plate composite shear wall, finite element models were established to verify the validity of the simulated results. Moreover, the influence of steel ratio, axial compression ratio and shear span to depth ratio on the bearing capacity of composite shear wall was studied. The results showed that the composite shear wall has good mechanical performance. Steel ratio and shear span to depth ratio had remarkable influence on the bearing capacity of the composite shear walls.
Study on the shape of super-high face rockfill dam with sloping compound structure
Authors: Lu Xi , Zhou Heng , Liu Jing , Di Shengjie , Zhang Ying 
Published: June 2021

Abstract
In order to solve the problems of large deformation and difficult maintenance of the super-high face rockfill dam, this paper innovatively proposes the slope-attached compound structure face rockfill dam. The difference between this dam and conventional rockfill dam is that a certain height of slope-attached concrete is set upstream of face rockfill dam. The finite element method is used to demonstrate the shape of the new structure, and the stress and deformation safety of the slope structure, face plate and rockfill dam are analyzed and evaluated. The research results show that it is feasible to set a certain height of sloping concrete in the upstream of the face rockfill dam, and it is also feasible to set a maintenance and drainage corridor in the slope, and this structure can effectively improve the safety and emergency maintenance conditions of the face rockfill dam.
Vibration test study on aeolian sand filler of existing slab culvert strengthened by corrugated metal pipe
Authors: Chen Hongyu , Yuan Xizhong 
Published: June 2021

Abstract
Inadequate structural bearing capacity has appeared in the Reinforced Concrete (RC) slab culverts in permafrost regions of China which have experienced degradation, and need to meet new codes or standards. Based on the method of strengthening for culvert structure by the corrugated metal pipe (CMP), in this paper, shaking table test and vibration box test were introduced to study the vibrational compactness of aeolian sand filled in the small space between the CMP and existing culvert. The results show that aeolian sand in drying or near saturation can be better compacted; aeolian sand with a higher water content has a lower optimum vibration frequency; the sand within 0.6 m from the vibrator can be effectively compacted and 0.4m is the best; in the vibration frequency range of 50~110 Hz, the modulus of aeolian sand decreases as the frequency increases.
Corrosion Behavior of Al-Mn-RE Alloy for Air Conditioning System
Authors: Xiao Gui’Hui , Shi Feijiong , Zhu Mingshan , Shi Jianguo , Liu Jianmin , Hu Xiaohu 
Published: June 2021

Abstract
The effects of RE content and cold rolling and annealing on the microstructure and corrosion resistance of Al-Mn-RE alloy were studied by means of metallographic microscope, scanning electron microscope and electrochemical workstation. The results show that the eutectic phases with different sizes and irregular shapes can be seen in Al-Mn-xRE alloys. With the addition of different RE content, the amount of eutectic silicon increases, the long strip eutectic structure fines and gradually turns into spherical or short rod-like structure. When RE content reaches 0.25% or more, the eutectic structure begins to coarsen. With the increase of RE content, the corrosion potential and pore size of Al-Mn-xRE alloys increase. The corrosion potential of Al-Mn-0.18RE alloy shows a trend of positive and negative migration first, and the corrosion current density decreases first and then increases, the maximum corrosion resistance is obtained when the RE content is 0.18%. The order of corrosion potential and pitting corrosion potential of Al-Mn-0.18RE alloy from high to low is: homogenized state> cold rolled + 325 °C annealed state> rolled state> cold rolled + 475 °C annealed state. The corrosion resistance of the Al-Mn-0.18RE alloy after rolling is lower than that of the homogenized state, but the subsequent stabilization annealing treatment at 325°C can improve the corrosion resistance.
Optimization for the degradation of food waste by a novel anti-acidification and salt-tolerant microbial consortium
Authors: Meng Qingbo , Gao Yude , Li Shuangke , Jiang Bini , He Mingfei , Bu Hao , Wang Hongling , Wu Di 
Published: June 2021

Abstract
Improving the microbial degradation capacity of food waste (FW) is a great challenge due to its acidity and high salinity. In this paper, an anti-acidification and salt-tolerant microbial consortium (AASTMC) obtained from acid and salinity mutagenesis of Bacillus amyloliquefaciens,
Bacillus cereus, Yarrowia lipolytica, and Trichoderma reesei was used to degrade residential food waste. The process parameters that influenced the degradation rate of organic matter were identified by response surface methodology (RSM) with a central composite design (CCD). The effect of inoculation amount, temperature, and bulk density on the degradation rate of organic matter decreased in turn. The degradation rate of organic matter reached 94.87% under the optimum parameters of inoculation amount: 5%, bulk density: 0.04 g/cm3, and temperature: 32.33°C.
Research on influence factors and control methods of backfill compactness
Authors: Li Yudian , Dong Jiajie , Fei Kai , Song Hao , Li Zeyi , Zhang Lintao 
Published: June 2021

Abstract
With the accelerating process of urbanization in China, civil engineering construction develops steadily, building modeling is very different, and the trend of functional diversification is gradually revealed. As the basic process of construction engineering, the quality of earthwork backfill plays an important role in engineering construction. If the quality of the backfill cannot meet the design requirements, the surface subsidence will affect the appearance of the building and cause quality defects, and the insufficient bearing capacity and uneven compaction of the backfill will cause quality accidents such as the inclination of the main structure or structural cracking. In this paper, taking a certain engineering earthwork backfill project as an example, through the dismantling of the construction process of backfill, from the source of backfill soil to the control of backfill quality process, using the measured data to analyze and study the factors affecting the compactness of backfill. The results show that the main factors affecting the compactness of backfill are soil particle size, moisture content, compaction thickness and compaction times. Through the experimental study, the targeted quality control measures are put forward to ensure that the overall quality of the construction project meets the design requirements.
An Approximation Solution to Estimate the Ultimate Bearing Capacity of Smooth Strip Footings on Ponderable Soil
Authors: Han Dong-Dong 
Published: June 2021

Abstract
The procedure for calculating the bearing capacity of smooth footings is employed to calculate the bearing capacity of strip foundations on general c-φ-γ soil by the method of characteristics. The numerical results are in good agreement with other known computations. The surcharge ratio, λ, is found to be another good parameter for evaluation of the bearing capacity without superposition. The approximate formula for estimating the bearing capacity factor Nγ is then proposed considering the influence of λ in addition to φ with an error of no more than ±3 % compared to the numerical results. The error caused by the superposition method is systematically analyzed and the influences of λ and φ on the superposition error are discussed.
Finite element analysis of flexural properties of recycled concrete beams with different content of nickel slag
Authors: Xiong Rui , Jin Songhao 
Published: June 2021

Abstract
Through ANSYS finite element simulation analysis, the influence of different amounts of nickel slag on the mid-span bending moment and deflection of recycled concrete beams under the initial cracking and yielding state is studied. The results show that with the increase of nickel slag content, the flexural performance of recycled concrete beams first increases and then decreases, and there is an optimal nickel slag content. When the nickel slag content is 94kg/m3, the nickel slag has the least effect on the bending performance of the beam. The bending performance of the nickel slag recycled concrete beam is similar to that of the ordinary beam using 100% cement, and it can be used in concrete bending members. Effectively use nickel slag to save resources and protect the environment.
Seismic numerical evaluation of GFRP beam-column joints connected by angle steel with slotted-hole
Authors: Yin Xiangdong , Xiao Xiao , Wang Yan , Yang Shulan 
Published: June 2021

Abstract
This paper is based on the ABAQUS finite element simulation software to study the seismic performance of the glass fiber reinforced polymer (GFRP) beam-column joint connected by the slotted-hole angle steel. Non-linear finite element analysis for the effect of slotted-hole on GFRP beams and different slotted-hole sizes on the seismic performance of joints were conducted. Four specimens D1, D2, D3 and D4 with different slotted-hole lengths were designed. The moment-rotation hysteretic curve, skeleton curve and energy dissipation curve of the specimen are obtained. The finite element analysis results show that: 1) the energy consumption of the slotted-hole joint is about 4%-21% higher than that of the ordinary circular hole joint. 2) The longer the slotted holes length is, the better the seismic energy dissipation performance is. The energy dissipation capacity increases by 3%-12% for each 2 mm increase in the slotted-hole length. 3) Although the larger the slotted-hole length is, the better the energy consumption is, the larger the deformation of the component will be caused. Therefore, according to the requirements of serviceability limit state, it is suggested that the slotted-hole length should be between 2 mm and 4 mm.
Analysis of mechanical behavior of primary lining in double-arch tunnel based on distributed fibre optic monitoring
Authors: Sui Yi , Cheng Xiaohui , Liu Kunjue , Pu Lijian , Li Cande 
Published: June 2021

Abstract
Cracking and crushing were observed in the first tunnel lining of the Kaidagu double-arch tunnel (China), excavated in weathered surrounding rock. This concrete damage occurred during excavation of the second tunnel. It was necessary to monitor the continuous strain distribution along the entire cross section of the lining. Optical fibres were attached to the inner and outer surfaces of the steel arch (primary lining) of the first lining, and monitoring was carried out during the second tunnel excavation. The overall strain distribution was obtained by the fibre optic monitoring, and the internal force and external load distribution of the primary lining were calculated using the proposed inversion analysis method. The calculation results indicated that the axial compression between the right arch shoulder and the right arch foot decreased, which could cause the internal forces of the middle partition wall to increase. The damage mechanism of the lining was inferred. For the first time, optical fibres were installed inside the lining instead of on the inner surface, and the inverse analysis method, which considered the combined effect of axial force and bending moment, was applied to the mechanical analysis of the primary lining. The calculations and analyses provided valuable information for the design and construction of similar projects.
Study on traffic flow characteristics of multi-lane freeway tunnel
Authors: Guo Da , Deng Xiaohua , Song Shenyou , Jiao Chengwu 
Published: June 2021

Abstract
The characteristics of traffic flow are recognized by studying the traffic flow variation law of multi-lane tunnel, which provides theoretical support for the management and control of multi-vehicle tunnel on expressway. By collecting traffic flow data of typical multi-lane tunnel, the relationship among running speed, traffic volume and mixing rate of large vehicles is analyzed. It is found that the inner lane has the highest speed, and the outward lane decreases successively. The higher the speed, the greater the speed difference between vehicles; The lower the mixing rate of large vehicles, the greater the velocity difference between vehicles; There is a negative correlation between the speed and the mixing rate of large vehicles. Finally, combined with the traffic volume and the mixing rate of large vehicles, the speed control strategy for different lanes is proposed.
3D DEM simulation of initial anisotropy in dredger fill soft soil
Authors: Song J , Yang S Y , Zhao Z , Huang X , Liu R H 
Published: June 2021

Abstract
The initial anisotropy has a significant effect on the mechanical properties of the soft soil. Based on the initial anisotropy of the particles, the mechanical characteristics are analysed from a microscopic view, and the micro-macro relationship of the soil is established. According to the particle morphology of soft soil, the discrete element method is used to construct the flaky particle clusters, and seven sets of samples with different initial deposition angles are established for consolidation and undrained triaxial simulation tests. The results show that the strength of the sample decreases first and then increases with the increase of the deposition angle. When the deposition angle is 0°, the flaky particles mostly appear in a nearly horizontal suspension, and the sample has the largest shear strength. The distribution of the contact force chain formed by the particles in the shearing process is also related to the deposition angle. Different deposition angles form displacement fields of different shapes. When the deposition angles are 45° and 60°, there are obvious deformation displacement bands. At the same time, the initial deposition angle affects the particle coordination number. The higher the sample strength corresponding to the lowest average coordination number of particles. The contact normal anisotropy coefficient is related to the strain hardening and strain softening characteristics in the shearing process. The increase in the contact normal anisotropy coefficient shows the characteristics of hardening, and the smaller the contact normal anisotropy coefficient shows the characteristics of softening.
Thermal conductivity and shrinkage properties of slag-based cement concretes
Authors: Zhao Jun , Shumuye Eskinder Desta , Wang Zike 
Published: June 2021

Abstract
The thermal conductivity, specific heat, and total drying shrinkage test of slag blended OPC cement is conducted by using a Hotdisk-2500S thermal conductivity, and non-contact shrinkage deformation measurement apparatus based on ISO 22007-2 and GB/T50082-2009 test standards, respectively. The influence of replacement rates of slag cement (0, 30, 50, and 70%) and high-temperature exposure (21, 200, 400, 600, and 800 °C) on the thermal properties of concrete is analysed. The results show that for all three concretes, the thermal conductivity initially decreases with increasing temperature up to 400 °C, then after it remains almost constant between 400 and 600 °C, and gradually begins to decrease again up to 800 °C. Furthermore, thermal diffusivity of concrete group G-70, shows 21.4, 21.6, and 37.6% increment in 21, 200, and 600 °C temperature exposure respectively compared to concrete group G-0. Though, as the exposure temperature keeps rise to 800 °C, its value starts to decrease. Furthermore, the results indicated that high volume slag cement content in the concrete mix lessen the drying shrinkage of the concrete at later age. Test data is used as a function of temperature and slag replacement to establish high temperature relations for thermal properties. The proposed thermal property relationships can be used as input data for validation in computer programs and to evaluate the response of OPC and slag blended Portland cement concrete structures subjected to fire.
Analysis of Asphalt Aging Behavior Evaluation Method Based on Infrared Spectrum
Authors: Liu Linlin , Lu Yong , Liu Aihua , Li Yali , Guo Ruyong 
Published: June 2021

Abstract
In order to analysis under microscopic scale fast evaluating asphalt asphalt aging mechanism and aging degree, Fourier transform infrared spectroscopy were used respectively to solvent method and ATR method to transmission spectra analysis of matrix asphalt, secondly by ATR method of matrix asphalt tested functional characteristics before and after the RTFOT aging, qualitative and quantitative analysis of the functional groups. The results show that there is no difference between the infrared spectra of the solvent method and the ATR method. Some carbon and sulfur elements in asphalt are oxidized to form carbonyl C=O and sulfoxide S=O functional groups during the aging process, and the oxidation of sulfur element is the main one. The sulfoxide index (SI) and carbonyl index (CI) are well correlated with the penetration degree of asphalt, the correlation coefficient reaches 0.83 and 0.84, respectively. The aging of asphalt increases the sulfoxide index (SI) and carbonyl index (CI), and the asphalt becomes hard and the penetration degree decreases. Infrared spectroscopy can effectively evaluate the aging behavior and degree of asphalt, which provides a new method for rapid detection of aging asphalt.
Analysis of the Necessity for Steel Changing Brace Erection During the Foundation Pit Excavation in Metro Station End Shaft
Authors: Guo Wang , Zhao Junyan 
Published: June 2021

Abstract
Under the engineering background of end shaft construction in an underground two-story metro station, the change and development laws of supporting axial force, enclosure structural deformation and internal force during the end shaft excavation process were analyzed through the field measurement, and the measured values were statistically compared with the design values. The results indicate that it is very necessary to erect steel changing brace in the design, which exerts an unobvious effect on mitigating the enclosure structural deformation of the foundation pit in practical engineering, but apparently affects the axial force of adjacent steel braces in the steel changing brace. The results can be verified through the long-term monitoring at different points during the subsequent metro construction, and other steel changing brace forms convenient for the construction should be considered to substitute the conventional steel changing brace.