bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of the deep pit construction on a settlements of surrounding buildings
Authors: Mirsayapov I T , Aysin N N 
Published: April 2021

Abstract
Various methods exist for calculating the subgrade settlements of foundations built on soil subgrade without defects and damages. The physical and mechanical characteristics of such soil subgrade are usually determined using the results of engineering and geological surveys and other methods that characterize their in-situ conditions before construction. It is usually assumed that these characteristics are constant throughout their life cycle regardless whether they get later disturbed by buildings and/or structures. In fact, the mechanical characteristics of the soils of the subgrade vary and are subject of continuous changes due to various factors. Therefore, the use of existing calculation methods often lead to inadequate estimates of settlements of subgrade and foundations of buildings and structures. Assessment of vertical deformations of soil subgrade in the zone of influence of deep pits usually falls in this category. The method for calculating the settlement of bases and foundations of buildings was developed taking into account the formation and development of defects and damages in the soil structure in the zone of influence of a deep pit. It is based on a method of layer-by-layer summation, taking into account the spatial stress state of the soil mass and changes in the mechanical state of the soil due to surcharge conditions.
Jacking precision control of pipe roof and large box culvert below urban expressway-a case study of a large underpass in Shanghai
Authors: Cheng Chihao , Liao Shaoming , Chen Lisheng , He Junzuo 
Published: April 2021

Abstract
Pipe roof-culvert box method is an effective way for shallow buried tunnel passing beneath important facilities. In soft ground, the culvert can be jacked under the pre-reinforcement of pipe roof. This paper presents an investigation on the precision analysis and control of a large- scale pipe roof jacking (the scale of this structure is 21.648m*8.148m) of an underpass, which passes beneath the Mid-Ring expressway in Shanghai. The conclusions drawn from this paper show that: (1) In this project, more than 70 percent of the deflection values of jacking machines and pipes are controlled within 20mm. (2) During the process of pipe jacking, the deflections of pipes tend to lag behind the machines’ about 3~10m. 68 percent of the rangeability of pipes’ deflection are 50%~100% of the corresponding machines’ deflection. (3) Due to Stiffness effect of pipeline, posture of pipe is difficulty to be rectified during the stages of pipe starting and receiving. A compelling rectification will result in overlarge deviation and increase the difficulty of subsequent operation. (4) For two adjacent pipes, the posture of latter pipe is positively related by the stiffness of prior pipe. The Pearson correlation coefficient of horizontal pipes and vertical pipes can be 0.46 and 0.68 respectively. (5) Considering the interspace between top pipes and box culvert, the control criterion of vertical deviation of box culvert is recommended as 5cm.
Research on Seismic Performance of Assembled Shear Wall with Grouted Anchors under Different Lap Parameters
Authors: Zhang Shuyun , Chen Mi , Li Zhilong 
Published: April 2021

Abstract
In order to study the performance of the anchor-connected shear wall under different lap parameters, ABAQUS was used to establish its analysis model. The C3D8R unit and T3D2 unit were used to model the concrete and steel bars respectively, and the steel bars were embedded into the concrete by embedding. Through the finite element analysis calculation and comparison with the test results, the applicability of the numerical analysis model is verified. On this basis, the structural skeleton under low-cycle repeated load tests is studied by changing the parameters of the connecting steel bar diameter, anchor length, and other parameters. Changes in curves, stiffness degradation curves, and energy dissipation capabilities. Through the finite element analysis calculation and comparison with the test results, the applicability of the numerical analysis model is verified. On this basis, the structural skeleton under low-cycle repeated load tests is studied by changing the parameters of the connecting steel bar diameter, anchor length, and other parameters. Changes in curves, stiffness degradation curves, and energy dissipation capabilities.
Incremental Dynamic Analysis of Guangyue Tower Timber Structure
Authors: Sun Liyue , Zhao Qingshuang , Wang He , Jin Jie , Li Chuankun 
Published: April 2021

Abstract
This paper takes the wooden structure of Guangyue Tower as an example, selects ANSYS finite element software, establishes the upper wooden structure and the finite element model considering the whole structure of the high platform respectively, uses the incremental dynamic analysis method, and uses different ground motion intensity parameters to carry on the dynamic time history analysis to it. The results show that the existence of the high platform magnifies the displacement response of the wooden structure, which is not conducive to the seismic resistance of the wooden structure; IDA curve expressed by ground motion intensity parameter PGA can better reflect the overall change of the structure, which is helpful to improve the effectiveness of seismic performance evaluation of Guangyue Tower.
Prediction of Allowable Debonding Strain of FRP-Strengthened RC Beam Based on GA-BP Neural Network
Authors: Hu Tianyu , Wang Jiahe , Li Guibing , Zheng Binbin 
Published: April 2021

Abstract
In order to avoid the debonding failure of FRP-strengthened RC beams, most codes have proposed models of the allowable debonding strain of FRP. However, experimental studies have shown that the incomplete consideration of parameters suggested by the codes leads to low accuracy and greater variability, and it is impossible to guarantee that the strengthened members will not be peeled off. In order to accurately calculate the allowable debonding strain of FRP-strengthened RC beams, a neural network model for predicting allowable debonding strain of FRP-strengthened RC beams was established, and genetic algorithm were introduced to optimize the weights and thresholds of the network. The established model was trained and simulated through experiment data. The results show that the established model has a coefficient of variation of 17%, and compared with the traditional BP neural network and codes, the built model has better accuracy and stronger robustness.
Finite Element Analysis on Steel-Concrete Composite Beams Considering the Bond-Slip Effect on the Interface
Authors: Dong Shun , Guo Jiafu , Zhang Chao , An Xuehui , Lu Mingqi 
Published: April 2021

Abstract
In order to accurately simulate the bond-slip performance of steel-concrete composite beams, a trilinear stress-strain relation model was adopted to simulate the mechanical properties of steel. A uniaxial stress-strain relation curve was used to study the nonlinear mechanical behaviors of concrete. The resisting shear effects of studs and concrete in the bonding area were equivalent to nonlinear springs. Based on the energy principle, a calculation method of the interfacial bond stiffness of steel-concrete composite beams was proposed and the interfacial bond-slip constitutive relation of steel-concrete composite beams was given. Based on it, the three-dimensional finite element analysis model of steel-concrete composite beams was established by the finite element analysis software ANSYS, and the numerical simulations of existing push-out tests of composite beams were performed. By comparison, it can be seen that the results from finite element analysis in this paper are close to the experimental ones. It indicated that the finite element analysis model can accurately simulate the bond-slip action of the interface, and this model can be applied to the numerical calculation and analysis of steel-concrete composite beams.
“Intelligent Construction, Digital Modeling of the Future” Internet + BIM Service EPC Project——Take the Exhibition Center of National Cybersecurity Center for Education and Innovation Project as an Example
Authors: Jiang Ming , Cheng Yang , Lei Ting , Liu Zhuojun 
Published: April 2021

Abstract
This paper discusses the application of Internet and BIM technology to serve the construction mode of “PPP +EPC+ Fund” and management mode of “Executive Architect”. Taking the Exhibition Center of National Cybersecurity Center for Education and Innovation project as an example, relying on the CITIC Intelligent Construction Platform, BIM and digital technology such as cloud computing, big data, IOT, mobile Internet, chainblock etc., are used in the entire life cycle of the project, including design, procurement, construction and facility management. The data sharing and information management of the whole life cycle of the project are realized, which strongly supports the scientific construction and operation of the project.
Research on Denoising Method for Improving the Identification Accuracy of Structural Damage
Authors: Ping Luo Chao , Guan De Qing , He Sai , Gao Fan 
Published: April 2021

Abstract
Under the influence of equipment and environment, gaussian white noise will be accompanied in the process of obtaining the measured vibration mode of the structure, thus masking the effective features of signal and disturbing the effect of damage identification. To avoid this problem, this paper presented a new denoising method. Firstly, the multi-index evaluation function constructed by analytic hierarchy process is used to select the optimal wavelet base and the decomposition layers’s number. Secondly, we use the newly constructed wavelet threshold function to research the wavelet coefficients in the high frequency part of the signal to remove the noise coefficients. Simulation results show: the new denoising method is contributing in improving the SNR of vibration signals and reducing the RMS error. The experimental results testified that the new method can effectively increase the accuracy of structural damage identification.
Determination of Optimal Air Change Rate for Cooling the Bedrooms of Residential Buildings in Guangzhou
Authors: Qin Cuicui , Zhang Yufeng , Zhao Lihua 
Published: April 2021

Abstract
Ventilation is a traditional strategy for cooling and energy saving in buildings in hot and humid climate. This study aims to develop correlations for calculating the optimal air change rate (ACH) for cooling that can be generally applied to residential buildings in Guangzhou. A bedroom prototype was built based on the typical design features of bedrooms, which were gotten through the investigation of 350 Guangzhou residential quarters. The impacts of three factors and ACH on cooling load were analyzed by simulations. ACH is the most important factor, followed by area ratio of window to wall, area and orientation. An increase from 5 to 10 ACH for 10-21 m2 bedrooms could decrease annual cooling loads by an average of 17%, and prediction models of annual cooling loads were obtained for bedrooms by multiple regression, which were tested to be statistically valid. The predictive correlations of optimal ACH were finally achieved, which could be directly applied to the ventilation design of bedrooms in Guangzhou. The optimal ACH for prototype bedroom ranged from 21.99 to 22.85 h−1 as change rate of ventilation contribution on cooling was 5%, and from 11.99 to 12.85 h−1 as change rate of ventilation contribution on cooling was 10%.
Architectural Culture Characteristics and Protection Opinions of Typical Tomb Towers in Jiangxi Province
Authors: Xu Feijin , Ye Xiaxi , Xie Fang 
Published: April 2021

Abstract
Absrtact. Jiangxi province is the holy land of Chinese Zen Buddhism and still retains many relics of Buddhist culture. There are a lot of researches on the stupa in the architectural field. However, few scholars have focused on the tomb towers in Jiangxi, and there are few records of the the girder cheers and the girder ceremony. Through surveying and studying some representative tomb towers in Jiangxi province and recording the The girder cheers in Jiangxi, it is helpful for the outside world to have a further understanding of their characteristics and charm, and put forward some Suggestions for the protection for the architectural culture of tomb towers in Jiangxi province.
Preliminary Exploration of Energy Saving Office Building Design in Hot Summer and Cold Winter Area
Authors: Zhang Naiwen 
Published: April 2021

Abstract
With the continuous development and progress of society, office building has become an indispensable part of it, but at the same time, a large number of modern offices are in a state of high energy consumption and environmental protection. Therefore, environmental protection, energy saving and comfortable office space has become the demand of modern people for the workplace. This paper shows the design process of an office building at the intersection of Wuhan pedestrian street and main road, analyzes the architectural design from the perspectives of building land, building shape and building energy saving, and carries out optical design and acoustic design for the building to achieve the effect of building energy saving.
Study on Collision Characteristics between Rigid Body and Elastomer Based on Stress Wave Theory
Authors: Zeng Zhiping , Huang Xiangdong , Wang Weidong , Guo Wuji , Ye Mengxuan 
Published: April 2021

Abstract
Rigid body with initial velocity and no gravity contact with the elastomer, this process is too short and it can be described by collision. The geometry shape of contact surface is same as the contour of rigid body. Under the excitation of initial velocity, the particles of the contact surface produce motion and propagate around as the stress wave. The moving energy of rigid body is gradually consumed under the action of surface reaction force and goes through the deceleration stage. During the collision process, there is a continuous symmetrical stress pulse at the contact surface. This paper first discusses the interfacial stress pulse characteristics of infinite cylindrical side and elastomer under the condition of initial velocity and no gravity. And then the formation process of surface and surface particle stress pulse, the law of collision time and contact surface width are analyzed. This research is useful for the study of interfacial stress in finite boundary collision.
Parametric Analysis of New Assembled Double Steel Plate-Concrete Composite Shear Wall Structure
Authors: Hong Cheng , Yi Shuai , Zhang Baohua , Liu Kai , Xu Qiuhua 
Published: April 2021

Abstract
At present, China’s construction industry is developing rapidly towards the goal of “design standardization and industrial production”. The State Council and local governments have also issued relevant documents on the development of fabricated steel structures, the development of assembled steel structure in China has been promoted. The Shear Wall structure is one of the most important components to ensure the earthquake resistance of the whole building, which can obviously improve the overall anti-lateral stiffness of the building, so it is widely used in high-rise buildings. In this paper, the thickness of steel plate and the distance between studs are selected as the parameters of the new shear wall structure, and 9 groups of models are used for parametric analysis. Finally, the data are compared and corresponding conclusions are drawn.
Research on the Influence of Light-Controlled Lighting System and Light-Controlled Shading System on Building Energy Consumption Based on Light Environment
Authors: Qin Cuicui , Li Zhihong 
Published: April 2021

Abstract
The light-controlled lighting system and the light-controlled shading system can adjust the architectural lighting and shading system according to the quality of the indoor light environment, and can reduce the building energy consumption. The energy consumption model of the light-controlled lighting system based on the illuminance of the indoor light control point and the light-controlled shading system based on the uncomfortable glare index for an office building in Wuhan was established respectively by the energy consumption simulation software eQuest. Three key types of glasses were considered to research the indoor light environment. The impacts of the light-controlled lighting system and the light-controlled shading system on building energy consumption were analyzed through simulations.
Effect of Test Voltage and Age on the Resistivity of Carbon Fiber Reinforced Concrete
Authors: Wang Zhihang , Xu Jinyu , Nie Liangxue , Xia Wei , Huang Zhe , Meng Xin 
Published: April 2021

Abstract
Using the four-electrode method, the resistivity of carbon fiber reinforced concrete (CFRC) with different fiber content and different curing ages was tested with different voltages. Starting from the relationship between fiber content, test voltage, curing age and resistivity, the conductive properties of CFRC were analyzed. The results show that: the greater the fiber content, the better the conductivity of CFRC; when the test voltage is greater than 15 V, the electrical resistivity of CFRC tends to be stable; the electrical resistivity of CFRC is closely related to the curing age.
Experimental Study on Salt Freezing Damage of Cement Concrete by Chloride Deicing Agent
Authors: Chen Xiaodong , Gao Peiwei , liu Jun 
Published: April 2021

Abstract
In winter, a large number of chloride deicing agents are spread in northern China. The damage effect of chloride deicing agent on concrete has attracted great attention in the industry. It is of great significance to study the mechanism of salt freezing to improve the service life and safety of roads and bridges in cold regions. In this paper, using C30 and C50 concrete specimens commonly used in highway engineering, using water bath box, oven, cut-201 ultrasonic instrument and other instruments and equipment, on the basis of a large number of indoor tests, the mode and degree of concrete salt freezing damage under freeze-thaw cycle environment are studied in depth, including the influence of concrete quality loss rate, appearance, dynamic elastic modulus and strength The influence mode and degree of concrete salt frost damage are given, and the variation law of various performance parameters of concrete under salt freezing condition is analyzed, which provides the test basis for the proposal of relevant protection measures.
Effect of Nano Compound Addition on the Properties and Microstructure of Cement Mortar with Mixed Fine Recycled Aggregate
Authors: Ying Kanjun , Yang Shaoyong , Meng Tao , Li Yuanyuan 
Published: April 2021

Abstract
The high-water absorption and poor mechanical properties of mixed fine recycled aggregate, which will lead to weakened interfacial transition zone (ITZ) between cement paste and aggregate, seriously hinder the recycling of mixed fine recycled aggregate. The effect and enhancement mechanism of nano compound addition (NCA) on the properties and microstructure of cement mortar was studied in this paper. The results indicated that the compressive and bending strength of cement mortar with 100% fine mixed recycled aggregate increased about 10% at most of the curing ages and the shrinkage of cement mortar decreased from 2.5% at 1 day to 21% at 28 days by NCA. Scanning electron microscope (SEM) micro photography indicated that the early hydration rate of cement could be accelerated and the density of cement mortar at late ages may well be increased by NCA.
Factors and Simulation of Temperature Field of the Green Cake during the Setting Process of the Autoclaved Aerated Concrete
Authors: Su Yufeng , Li Haifeng , Liang Shiying 
Published: April 2021

Abstract
The effects of initial temperature and water to material ratio on hydration heat of Autoclaved Aerated Concrete (AAC) slurry were studied. The effects of curing temperature and mold conditions on the temperature field of the green cake during the setting process were analyzed. The temperature distribution green cake was tested and simulated by finite element software. The results show that the higher the initial temperature, the higher the rate of hydration heat, but does not affect the total hydration heat of slurry. When the water to material ratio increases, the maximum temperature rises of slurry decreases. When the curing temperature of the green cake increases, the temperature field remains unchanged, the maximum temperature rises increases, and the temperature difference in the same dimension decreases. The size and distribution of the temperature in the height direction is affected by the mold conditions on the upper surface of the green cake, while the temperature in the radius direction is affected by the mold conditions on the side of the green cake, but the distribution law remains unchanged. The finite element model of temperature field of green cake in the setting process of AAC is established and has good accuracy with the test values.
Effect of Aluminum Sulfate on the Hydration of Tricalcium Aluminate
Authors: Jing Xiuyan , Zhang Yan , Liu Huaqing , Liu Jialong , Kong Sen 
Published: April 2021

Abstract
Aluminum sulfate (AS), as the main composition of alkali-free accelerator, was widely used to accelerate the setting and promote the early strength in the sprayed concrete. In this study, effect of AS on the hydration reaction of C3A was investigated, which is one of the most important cement clinker minerals in the early age of cement hydration. The hydration reaction and products of C3A-AS system were characterized with hydration heat test, X-ray diffraction, thermogravimetric analysis, scanning electron microscope, and thermodynamic modeling. Results indicate that AS could hinder the hydration reaction in the very early age but then accelerate C3A hydration by producing SO4-AFm, OH-AFm, and gibbsite. The findings are expected to provide theoretical guidance for the product research and engineering application of alkali-free accelerator.
Theoretical Study on the Size Effect of the Rate Characteristics of Concrete Cubes Compressive Strength
Authors: Zhou Hongyu , Liu Yanan , Zhou Yun , Tang Qi 
Published: April 2021

Abstract
In order to study the effect of size effect and rate correlation on the mechanical properties of concrete, a total of 228 concrete cube test blocks of three sizes (70, 100 and 150mm) were tested and studied under four strain rates (10−5,10−4,10−3,10−2/s). The test results show that under the same strain rate, the peak stress of concrete decreases with the increase of the size. Under the same size, the peak stress of concrete increases with the increase of strain rate. Experimental data were used to verify and modify Weibull size effect equation based on statistics and Bazant size effect equation based on fracture mechanics. The experimental data fit well with the equation, and the size effect theory of concrete strength with correlation of holdup is established.
Modification of the Constitutive Model of Concrete Material Considering the Effect of Structural Size
Authors: Zhou Hongyu , Tang Qi , Zhou Yun , Liu Yanan 
Published: April 2021

Abstract
As the size of the structure increases, the size effect on the mechanical properties of the structure cannot be ignored. During the service period, the reinforced concrete structure will be affected by the size effect. At present, there is no item concerning material size effect in the current regulations in my country. This paper summarizes the existing size effect theory and finds a function that expresses the size effect of concrete. The peak strength size effect coefficients of domestic and foreign researchers are analyzed, and the logarithmic function form is used to calculate the peak strength size effect coefficients obtained by various researchers. The average value was fitted. We found the size effect coefficient of the ultimate strain of concrete based on the test results, and took the size effect coefficient of the ultimate strain of the concrete with a cube side length of 150 mm as one for analysis. Finally we revised the constitutive relationship of concrete.