bluuebunny/crossref_metadata_2025 huggingface dataset:
Determination of responses of liquid xenon to low energy electron and nuclear recoils using a PandaX-II detector *
Authors: Yan Binbin , Abdukerim Abdusalam , Chen Wei , Chen Xun , Chen Yunhua , Cheng Chen , Cui Xiangyi , Fan Yingjie , Fang Deqing , Fu Changbo , Fu Mengting , Geng Lisheng , Giboni Karl , Gu Linhui , Guo Xuyuan , Han Ke , He Changda , Huang Di , Huang Peiyao , Huang Yan , Huang Yanlin , Huang Zhou , Ji Xiangdong , Ju Yonglin , Li Shuaijie , Liu Jianglai , Lei Zhuoqun , Ma Wenbo , Ma Yugang , Mao Yajun , Meng Yue , Ni Kaixiang , Ning Jinhua , Ning Xuyang , Ren Xiangxiang , Shang Changsong , Si Lin , Shen Guofang , Tan Andi , Wang Anqing , Wang Hongwei , Wang Meng , Wang Qiuhong , Wang Siguang , Wang Wei , Wang Xiuli , Wang Zhou , Wu Mengmeng , Wu Shiyong , Wu Weihao , Xia Jingkai , Xiao Mengjiao , Xie Pengwei , Yan Rui , Yang Jijun , Yang Yong , Yu Chunxu , Yuan Jumin , Yuan Ying , Yue Jianfeng , Zeng Xinning , Zhang Dan , Zhang Tao , Zhao Li , Zheng Qibin , Zhou Jifang , Zhou Ning , Zhou Xiaopeng , (PandaX-II Collaboration)
Published: April 2021

We present a systematic determination of the responses of PandaX-II, a dual phase xenon time projection chamber detector, to low energy recoils. The electron recoil (ER) and nuclear recoil (NR) responses are calibrated, respectively, with injected tritiated methane or 220Rn source, and with 241Am-Be neutron source, in an energy range from 1-25 keV (ER) and 4-80 keV (NR), under the two drift fields, 400 and 317 V/cm. An empirical model is used to fit the light yield and charge yield for both types of recoils. The best fit models can describe the calibration data significantly. The systematic uncertainties of the fitted models are obtained via statistical comparison to the data.
Crust-core transition and dynamical instabilities in neutron stars for model with point-coupling interactions *
Authors: Chen Yan-jun , Cheng Zi-peng , He Bin-guang
Published: April 2021

We explore the effects of the density dependence of symmetry energy on the crust-core phase transition and dynamical instabilities in cold and warm neutron stars in the relativistic mean field (RMF) theory with point-coupling interactions using the Vlasov approach. The role of neutrino trapping is also considered. The crust-core transition density and pressure, distillation effect, and cluster size and growth rates are discussed. The present work shows that the slope of symmetry energy at saturation, temperature, and neutrino trapping have non-negligible effects.
Stability of beta-induced Alfvén eigenmodes (BAE) in DIII-D
Authors: Heidbrink W.W. , Van Zeeland M.A. , Austin M.E. , Crocker N.A. , Du X.D. , McKee G.R. , Spong D.A.
Published: April 2021

Although the stability of ellipticity, toroidal and reversed-shear Alfvén eigenmodes (EAE, TAE, RSAE) are relatively well understood, less is known about the stability of lower-frequency modes such as the beta-induced Alfvén eigenmode (BAE) but, because they are often unstable in present devices and are implicated in fast-ion transport, understanding their stability is vital. BAE stability is studied in primarily weak or reversed shear DIII-D plasmas with sub-Alfvénic deuterium beams. Modes are classified based on electron cyclotron emission, beam emission spectroscopy, magnetics, and interferometer data. The study is limited to the initial two seconds of the discharge, where the evolving q profile provides an effective scan of the dependence of stability upon q. In a dedicated experiment, BAEs are unstable at times in the discharge when the minimum of the safety factor q
min is close to a rational number. The observed mode frequencies are usually close to analytic estimates of the BAE accumulation point and the eigenfunction peaks in the vicinity of q
min. Unstable BAEs usually occur in bursts that chirp rapidly in frequency. To isolate the importance of thermal and beam gradients in driving the modes, the beam and electron cyclotron heating power is altered for 50–100 ms durations in reproducible discharges. As expected from the resonance condition, BAEs depend sensitively on the beam power and injection geometry. Modes only persist for ∼25 ms because the anisotropic beam population only interacts strongly with the modes over a relatively narrow range of q. A database of over 1000 beam-heated discharges shows that BAEs are more likely to be unstable when the poloidal beta exceeds 0.5.
Application of the elliptic approximation model for the edge turbulence rotation measurement via the poloidal correlation reflectometer in Wendelstein 7-X
Authors: Han X. , Krämer-Flecken A. , Xiang H.M. , Vécsei M. , Knieps A. , Windisch T. , Anda G. , Andreeva T. , Bozhenkov S.A. , Geiger J. , Dunai D. , Trier E. , Rahbarnia K. , Zoletnik S. , Liang Y. , W7-X Team the
Published: April 2021

The perpendicular velocity (v
⊥) of turbulence is measured by means of a hopping poloidal correlation reflectometer diagnostic for the study of turbulence rotation in the plasma edge region in Wendelstein 7-X. An elliptic approximation (EA) model is applied for calculating the space-time correlation in the edge region. The v
⊥ profile is compared in the high-ι (edge ι ≈ 1.2) and limiter (edge ι < 1) configurations. It is found that the v
⊥ gradient is inversely proportional to the heating power in the high-ι configuration, which could be attributed to the turbulence activities in the plasma edge. In the limiter configuration, the v
⊥ spike is observed near the island boundary, which is corresponded to the plasma current crash. In the standard configuration (edge ι ≈ 1), the v
⊥ profile in the island region distributes as a function of the perpendicular separation. With increasing of the plasma current, the island enlarges the size as is referred from the v
⊥ scope, accompanying with steepening of the v
⊥ gradient at the boundary of the island.
Retraction: Research on Multimodal Emotion Analysis Algorithm Based on Deep Learning (J. Phys.: Conf. Ser.
1802 032054)
Authors: Xiao Xuan , Yang Jie , Ning Xinyi
Published: April 2021

IOP Publishing Limited ("IOPP") is retracting this paper following an investigation in accordance with COPE guidelines. which has confirmed translated plagiarism.

This work was originally published in Chinese [1] and has been translated and published without permission or acknowledgement to the original authors. IOP Publishing Limited request any citations to this article be redirected to the original work [1].

IOPP have made multiple attempts to contact the author but has not received a response. The author is encouraged to contact jpconf@ioppublishing.org.

[1] LIN Min-hong, MENG Zu-qiang. Multimodal Sentiment Analysis Based on Attention Neural Network[J].Computer Science, 2020, 47(11A): 508-514.

Retraction published: 23 April 2021
Simultaneous flood risk analysis and its future change among all the 109 class-A river basins in Japan using a large ensemble climate simulation database d4PDF
Authors: Tanaka Tomohiro , Kobayashi Keita , Tachikawa Yasuto
Published: April 2021

Abstract

This study investigated simultaneous flood risk among all the 109 class-A river basins over Japan using the big data of (over 1000 years) annual maximum hourly flow simulated from a large ensemble climate simulation database for policy decision making for future climate change, and proposed a novel approach in its geospatial analysis by applying two informatics techniques: the association rule analysis and graph theory. Frequency analysis of the number of rivers with the annual maximum flow over the flow capacity in the same year (defined as simultaneous flooding here) indicated that simultaneous flood risk will increase in the future climate under 4-degree rise scenarios in Japan, whose increment is larger than the variation of sea surface temperature projections. As the result, the return period of simultaneous flooding in eight river basins (the same number as in a severe storm in western Japan, 2018, causing the second worst economic damage since 1962) is estimated at 400 years in the historical experiment, 25 years in the 4-degree rise experiment. The association rule and graph theory analyses for the big data of annual maximum flows in the future climate scenarios indicated that simultaneous flood occurrence is dominated by spatial distance at a national scale as well as by the spatial relation between mountainous ridges and typhoon courses at a regional scale. Large ensemble climate simulation data combined with the informatics technology is a powerful approach to simultaneous flood risk analysis.
The implications of technological progress in architectural thinking: The future impossibility for an architecture of hiding
Authors: Beqiri J
Published: April 2021

This paper aims at exploring the future of architecture of hiding which is encountering the constant pressure of technological advance. The open society and its increasing surveillance are requiring human behaviour to adjust to new realities of hiding. One estimate puts the number of surveillance cameras around the world at 245 million and another reckons there will soon be over twice that number in China alone [1]. Consequently, the perception of hiding architecture is changing, and its romanticism is facing a serious threat. Up to 20th century, hiding an object - space - to the degree of resembling alienation or nothingness assumed meanings addressed to intellect and to the body, meanings imposed by threats or by sanctions. In its ancient Greek version, one could grasp the space by means of a thought-process capable of perceiving them as a totality and endowed with meaning. But today, the boundaries between inside and outside are being dissolved for an observer who through technological means is able to move freely in space and time, defeating the hiding architectures and its three-dimensional spatial perception. To quote Henri Michaux: “I put an apple on my table. Then I put myself inside this apple. What peace! [2]” The advance of technology has made hiding a matter of self-perceiving which has only a distant link to geographical reality. The underground space remains the prime solution for hiding but the increasing conversion of underground structures and military fortifications into data centres tells that the importance of data storing is surpassing that of physical hiding. Instead, the architecture of hiding is transforming into the architecture of living without traces. Technological progress is taking us to a milieu in which the tracelessness of the fugitive becomes the representation of the hidden space. However, as Peter Sloterdijk puts it forward in Bubbles [3], what lends modern psychological knowledge its strength and autonomy is that it has shifted the human position beyond the reach of geometry. Now, the space created is being conceived before it is actually “lived”, meanings are no longer conveyed by a continual putting-to-the-test of the emotions, and humankind is adjusting to new realities by finding other means of hiding, presumably through architecture of data and digital cryptography.
Willingness to walk in underground space – evidence from Singapore
Authors: Zacharias J , Wang B
Published: April 2021

Research on the environmental factors in promoting longer walks has focussed on the outside environment. This research concerns factors in the willingness to walk (WTW) in underground space, in a tropical climate, that of Singapore. Participants were accompanied on a pre-determined itinerary and responded to a questionnaire at intervals on perceptions of their experience and their willingness to continue walking. Several environmental factors were related to WTW. Participants ranked corridor width and the volume of pedestrians as the most important factors in comfort. Although WTW observed a distance-decay function as expected, there were restoration episodes across the participant group, strongly suggesting conditions that enable longer walks in underground space.
Principles of the integrated development of Moscow City underground space
Authors: Konykhov D.S. , Kolybin I.V.
Published: April 2021

Moscow is the most dynamically developing metropolis in the Russian Federation. This is a city with almost a thousand-year history, where about 12.65 million people live on an area of 2.5 thousand km2. The economic efficiency of the underground space utilization is characterized by the ratio of the area of the underground part of the structure to its total area. Said ratio on average is less than 8% for the city of Moscow. From 2011 to 2019, 50 new metro stations and about 82 km of new metro lines were built in Moscow. By the end of 2027, it is planned to build 329 km of new lines and 151 stations. The housing renovation program provides for the renovation of 5175 residential buildings with maximum utilization of the underground space to ensure a comfortable living for people. The report considers the basic principles, goals and objectives of the integrated development of the underground space of Moscow, indicated in the Code “High rise buildings and complexes. Regulation of urban planning”. A review of accumulated experience in the construction and operation of residential areas of Moscow, built on the autonomous principle of “city in city”. Methods for ensuring the integrity and technological safety of existing buildings with integrated development of the underground space are considered.
Research on the development and utilization of underground space in Beijing Old City
Authors: Shi Xiaodong , Zhao Yiting , Wu Kejie
Published: April 2021

As a concentrated embodiment of urban historical sites, cultural relics and cultural heritage, the old city of Beijing has the most intensive historical and cultural resources and the most stringent requirements for historical protection. At the same time, it also faces a series of development problems to be solved, such as insufficient development space, lagging public service facilities, and urgent improvement of living environment. How to effectively utilize the underground space resources and coordinate the relationship between historical protection and urban renewal is an important issue for the sustainable development of the old city of Beijing. In this paper, the development and utilization strategies of the underground space in the old city of Beijing are systematically studied, as well as the reasonable utilization methods of the underground space in the historical protection areas. Through the development and utilization of underground space, we can make up for the shortage of public service and better improve the ground space environment. In addition, this paper also discusses the integrated development of underground space and metro stations, so as to enhance the urban renewal and development of the station areas. The relevant data and conclusions are from the latest planning and practical experience of Beijing old city, in order to provide useful reference for the sustainable development of historical urban areas and the scientific utilization of underground space resources.
Underground space in metro area: constituent, influencing factors and improving strategies of the spatial vitality
Authors: Xu YJ , Bai X , Chu KF
Published: April 2021

Nowadays, the shortage of available urban land and the booming construction of urban subway are driving the rapid development of Underground Space in the Metro Area (USIMA) which is an important constituent in the compact development of cities. Spatial vitality, as one of the most important evaluation indicators for the layout of such metro-related underground space, is closely related to spatial efficiency. Therefore, taking Shanghai People’s Square Metro Station (SPSMS) as a case study, this paper investigated the variable factors of the spatial vitality in USIMA by using methods of space syntax, field investigation, and pedestrian counting. Results revealed that the spatial vitality of USIMA is comprehensively affected by related variables, including accessibility and visibility of spatial configuration, degree of functional mixture, layout of station hall as well as entrances/exits, and the organization of business forms. Finally, improvement suggestions and discussions are put forward from the aspects of entrance/exit layout, spatial organization, and functional distribution, to provide reference for future planning, design and optimization of USIMA with effective vitality.
A perspective on the governance of London’s subsurface
Authors: Von Der Tann L , Metje N , Collins B , Melo Zurita M
Published: April 2021

The role of the urban subsurface for cities has long been disregarded but is recently getting more attention. To capture it, the city’s geographical and geological setup, its history and the social context it is located within are of particular relevance. As a case study, this paper illustrates the context and governance of London’s subsurface through the lens of a ‘governance arrangement’ looking at these three elements. It is highlighted that feedback loops between the material reality and the societal context – human influences on the subsurface environment – are not sufficiently recognised. The paper demonstrates how the discretionary nature of the UK’s planning system puts local planning authorities on the one hand, and engineers and technical knowledge on the other hand, in central positions to mediate strategic plans and influence specific project applications and decisions. From the empirical analysis presented here, no sense of urgency is assigned to the concept of underground space planning in London at this moment in time. However, the analysis suggests a need for better understanding of the spatial and material effects of specific interventions, as well as of the according policies and strategies. Current discourses around underground data sharing or geothermal energy provision could facilitate the process towards a spatial integration of the various strategies that are in place.
The network pattern of underground pedestrian system and its role to urban resilience
Authors: Zhao Ziwei , Xie Jinrong , Zhang Chenhao , Guo Dongjun , Chen Yulu , Yuan Yuan
Published: April 2021

In recent years, underground pedestrian system (UPS) has been developed worldwide, especially within central megacity areas, but research on UPS characteristics is still in the qualitative description stage, and quantitative methods are lacking to assess the impact of UPS on resilience. Therefore, it is essential to quantitatively measure UPS resilience and thus be able to make decisions on how UPS can be improved. The authors propose topological analysis of UPS networks based on computational and functional graph representations, which represents a new approach to theoretical discussions and empirical evidence for planning and configuring a UPS, thereby contributing to urban resilience. These representations provide functional views in which nodes represent single underground spaces and links represent underground sideways. Various graph measures are computed for structural analysis, and results provide insights into the required physical properties for planning resilient UPS. Based on validations applied to two typical high-density areas in Nanjing Xinjiekou and Guangzhou Zhujiang New Town, China, the authors examine how different UPS network patterns influence resilience performance, then further discuss the social and economic factors affecting network patterns, and give suggestions.
Waterproofing for buried decks
Authors: Hickman BSD
Published: April 2021

Buried decks are an increasingly common feature in the modern built environment. This increase may be partly attributed to growing awareness of the need for sustainability. Green roofs, sustainable urban drainage, water attenuation and even parks and farms are being located on top of ground floor roof structures and cut and cover tunnels. Waterproofing of these decks is vital in order to use the space created beneath and, also, to prolong the life expectancy of the structure.

This research explores some of the available best practice guidance and then compares the key waterproofing design features with opinions from industry. Opinions are gathered through seventy-eight questionnaire respondents made up of UK based professionals dealing with waterproofing of buried decks.

This research suggests that buried deck waterproofing design can reduce risk by employing the following features: (a) reinforced concrete structural deck, (b) fully-bonded waterproofing membrane, (c) waterproofing laid to a gradient to falls, and (d) provision of a drainage void over the waterproofing layer.

As a result of these findings this paper calls for more authoritative best practice guidance on buried deck waterproofing design in a bid to reduce pressures in procurement that lead to weaker waterproofing design choices.

This research may be of interest to those involved in the design and construction of underground structures including cut and cover tunnels, station boxes, malls, basements and more. The research identifies some fundamental features of podium deck waterproofing design and clarifies which design choices are perceived to deliver more robust waterproofing than others.
Subsea tunnel linking Föglö with the main island in Åland
Authors: Grøv E , Høyar O , Holmstrøm H M
Published: April 2021

The paper describes a well considered subsea road tunnel in Åland, Finland which will hopefully start in the very near future. The paper describes partly the socio-economics and public benefits of such a project in Åland and partly some technical aspects of designing and constructing road tunnels under the sea to connect land masses. The tunnel is expected to be constructed along the lines of similar rock tunnels being constructed and entered into successful operation in many of the Scandinavian/Nordic countries. More important though is the vital role such a project will serve for the society in Åland. The project is not one that serves millions of people in busy mega cities – still it is a pleasure to see a mega project for a small community mature, starting from a sketchy plan made by individual enthusiasts to a solid plan for a multi-million Euro investment.
St1 Deep Heat Project: Geothermal energy to the district heating network in Espoo
Authors: Kukkonen I T , Pentti M
Published: April 2021

St1 Deep Heat Project with its two deep wells extending to 6.2 - 6.4 km depth is the world’s deepest industrial geothermal energy project. The aim is to build an EGS (enhanced geothermal system) at the depth of about 5 - 6 km. The project is a pilot aiming at exploring the technical and economic feasibility of geothermal energy in the crystalline rock conditions of Finland for production of thermal power to a district heating network. Due to the demands of the district heating, the aim is to produce hot fluid at about 100°C and re-inject it to the formation at 50°C. The 100°C goal requires to drill to about 6 km depth. The drill site is located in Espoo, next to the Fortum district heating plant on the Aalto University campus. So far (2020) the project has drilled a 2 km deep completely cored pilot hole (OTN-1), and two deep wells OTN-2 to 6.2 km and OTN-3 to 6.4 km. Hydraulic conductivity has been enhanced by hydraulic stimulation in both deep wells in 2018 and 2020. The extreme depth level sets significant challenges for drilling and hydraulic stimulation, as well as controlling of induced seismicity. At present, the project proceeds with the installation of production pumps in OTN-2 and OTN-3, and first test cross-hole pumpings are expected to start in January 2021. In the presentation we provide an insight to the project and its major achievements and challenges.
An edge-computing-based sensing system for geo-structure risks
Authors: Huang Ruida , Fan Yiqun , Liu Yi
Published: April 2021

With the advancement of geo-structures (including tunnels and underground space projects), risk management strategy has been developing rapidly in China since the 1990s. Its current practice, however, mainly focuses on the assessment of structures with qualitative or quantitative method. Currently, less attention is paid to risk control, which results in the lagged response to risk events. In this paper, risk management strategy of geo-structures at operation stage is discussed. Furthermore, an edge-computing-based risk sensing system, mainly based on image recognition, consisting of a set of cameras, edge gateways and wireless network, is proposed. The system offers real-time monitoring for structural and operational performance, and edge computing to sense early risks within geo-structures. A preliminary test of the system has been conducted.
Enhancing underground development users’ health through facilities management: a study of the underground metro system in Hong Kong
Authors: Chan Isabelle , Soh Chee Kiong , Chen Hao
Published: April 2021

The ever-rising global population poses a great challenge for cities to accommodate additional citizens in limited land space. As such, many high-density cities were transforming the mind from “build higher” to “dip deeper”. However, most of the existing underground space were built with inadequate consideration of user’s health. Thus, this study aims to enhance underground users’ health using an integrated Facilities Management-Health (FM-H) model. A questionnaire survey study was conducted in 4 underground metro stations in Hong Kong, which resulted in 120 valid survey responses. Based on the extensive literature review, the survey was designed to cover eight FM factors: thermal comfort, indoor air quality, ventilation, visual comfort, noise level, greenery, wayfinding support, and immediate access, and four health indicators: physical health, emotional exhaustion, depersonalization and claustrophobia stress. Pearson’s correlation and multiple regression modelling were adopted to investigate the associations between FM and users’ health. The results indicate that, even though all FM factors were found to have a significant impact to at least one health indicator, thermal comfort and wayfinding support were found to have impacted on three health indicators respectively. This sheds light to the importance of needing further investigation into these two FM factors in underground studies.
Fire safety issues in underground spaces: a need for regulatory evolution – French, Swiss and Hong Kong SAR, China (Hong Kong) contexts
Authors: Moreau B , Deffayet M , Chan I , Lam F , Chau P , Bettelini M , Ng F , Au G
Published: April 2021

Current regulations and operational safety requirements impose onerous constraints that make it difficult to be fulfilled by practical design of underground projects acceptable to all stakeholders. The ACUUS working group on fire safety of underground spaces intends to gather and share information on the ways how fire safety is taken into account and managed in different countries. This article presents the first work carried out within this working group. Regulatory contexts in France, Switzerland and Hong Kong SAR, China (Hong Kong) are presented, highlighting the current limitations. With their similarities and differences, the French, Swiss and Hong Kong contexts reveal a need to improve and to develop their respective regulations to allow pragmatic solutions without compromising fire safety. Underlying principles that condition fire safety requirements are defined in order to develop new approaches to overcome the aforementioned limits.
Influence of the deep pit construction on a settlements of surrounding buildings
Authors: Mirsayapov I T , Aysin N N
Published: April 2021

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.