bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fire Performance of Insulated RC Beams Shear-Strengthened with CFRP Sheets
Authors: Mahmood Haris , Gao Wan-Yang , Hu Ke-Xu 
Published: April 2021

Abstract
In the literature, there is a lack of research on the fire performance of RC beams shear- strengthened with FRP laminates. This paper for the first time presents the fire endurance tests of insulated FRP shear-strengthened RC beams. A total of seven rectangular RC beams were constructed: three were tested at ambient temperature to determine their load-bearing capacity while the remaining four were first exposed to ISO 834 standard fire for 2.5 hours. Fire endurance tests indicated that the RC beam without insulation was characterized by shear failure due to the propagation of diagonal cracks. In contrast, the insulated FRP shear-strengthened RC beams could achieve a satisfactory fire resistance of 2.5 hours with small deflection responses under fire exposure. Because the additional fire protection layer provided adequate protection, the temperature responses recorded at the FRP-to-concrete interface were less than 250 °C, while the temperatures of the steel stirrups were around 120 °C during the entire fire exposure.
Fatigue Life of Welded Structures under Random Load Study on Frequency Domain Method
Authors: He Sai , Guan De Qing , Ping Luo Chao , Gao Fan 
Published: April 2021

Abstract
In this paper, based on the finite element software, the residual stress of the structure weld is obtained through simulation analysis. The influence of stress concentration is considered by using the mean square stress concentration factor; and the S-N curve equation of the structure is derived. then, the stress power spectrum density of dangerous parts is obtained by random response analysis; Then, the vibration mode of the welded structure is obtained by random response analysis, and the acceleration power spectral density of the structure is input, and then the stress power spectrum density of the dangerous part is obtained Finally, the appropriate stress probability density distribution model is selected to predict the fatigue life with S-N curve equation and Miner damage accumulation theory. The results show that the fatigue life predicted by this method is very close to that of rain flow counting method.
Interface Stress Element Method, Rigid Body Spring Model and Applied Element Method
Authors: Feng Biao 
Published: April 2021

Abstract
Interface Stress Element Method(ISEM), Rigid Body Spring Model(RBSM) and Applied Element Method(AEM) are typical connected discrete element methods derived from the same origin. Although there are many differences in their model compositions, expression forms, development paths and application situations, the three methods are closely related. In this paper, the commonalities and differences among ISEM, RBSM and AEM were expounded from five aspects: model composition, stiffness matrix for interface, formula for inter-element stress, theoretical system and analysis procedure. They discretize the domain with rigid blocks, but connect them using interface layers, distributed spring pairs and multiple spring pairs respectively. For homogeneous isotropic materials, the stiffness matrixes for RBSM are equal to that for ISEM, and there are only four items different in the stiffness matrix for AEM. The formula for inter-element stress of RBSM and AEM can be expressed by that for ISEM. The relationships among ISEM, RBSM and AEM were further clarified. RBSM and AEM are both special cases of ISEM. They can be incorporated into the theoretical system of Interface Stress Element Method. The three constitute a unified method family.
Experimental Study on Seismic Behaviour of Angle Steel Connections with Concealed Corbel of Fully Assembled Frame Beam and Column
Authors: Li Zhe , Qiao Chengyuan , Shi Manghua , Qiao Lu , Chen Xingyu 
Published: April 2021

Abstract
A method of “concealed corbel angle steel and bolt” is proposed to connect beams and columns of assembled frame. To study the seismic performance of the connection is designed an ordinary concrete beam specimen and three in the form of assembly connection specimens. The hysteretic curve, skeleton curve and ductility coefficient of cast-in-place specimen and angle steel connection specimen with concealed corbel are analysed by low cycle repeated load test. The influence of the angle steel thickness and the additional rib on the specimen in the assembly connection scheme is discussed. The test results show that: compared with ordinary cast-in-place concrete specimens, the assembly connection specimens have higher bearing capacity under the action of low-cycle reciprocating load. The hysteretic curves of the assembly and connection specimens were relatively full, and the displacement ductility coefficient was greater than 3.0, indicating that the assembly and connection specimens had good ductility. Increasing the thickness of the Angle steel and the additional ribs can improve the bearing capacity of the specimens. In particular, increasing the thickness of the Angle steel can significantly improve the bearing capacity of the specimens assembled and connected and reduce the damage of dark corbel before loading.
BIM Collaborative Design Solutions for Super High-Rise Buildings Over 250 Meters
Authors: Sun Hao , Ji Ruyan , Xie Wei 
Published: April 2021

Abstract
Super high-rise buildings are the product of human economic activities and technological progress. Construction of super high-rise buildings is difficult and involves many participants. Super high-rise buildings over 250 meters are facing more implementation difficulties, and design stage is the initial stage of the construction process. How to promote the design work of all participants in the design phase is a problem that must be solved in the design of super high-rise buildings. This research aims at 4 special difficulties in the design of super high-rise buildings with a height of 250 meters: multi-specialty collaborative design and management, Multi-party collaborative design and management, lightweight interaction of BIM models, data format exchange between software. This study adopts an integrated design platform to propose corresponding solutions to promote the collaborative design of super high-rise buildings. Finally, a super high-rise building design project is used as a case to demonstrate the research method.
Research on Construction Method of Semantic Dictionary in Architecture
Authors: Bi Zhenbo , Wang Huiqin , Lu Ying , Yang Hua 
Published: April 2021

Abstract
Creating a semantic dictionary is an important means of solving semantic problems in the BIM core technology system, and it is one of the cores of the application of BIM technology in the architectural field. At present, the research on IFD-like libraries in China is still in its infancy. How to construct a semantic dictionary suitable for the needs of the domestic civil engineering field is one of the key issues in domestic BIM technology research. In response to this problem, this paper proposes a method of constructing an IFD Library based on the ontology of the architectural domain. Firstly, it discusses the basic problems of IFD Library-like, then analyzes the root causes of semantic ambiguity in the application of BIM technology and the methods to solve semantic ambiguity, and finally explores and verifies the method of how to construct IFD-like Library based on the ontology of the architectural domain.
Study on Anti-Seismic Analysis of High-Rise Diaojiaolou Considering Pile-Soil Interaction
Authors: Xu Ning , Jia Chuanguo , Yang Pu , Zhang Qingzhang , Zhao Jianli 
Published: April 2021

Abstract
High-rise Diaojiaolou in mountainous areas have poorer seismic performance than flat high-rise structures due to their large structural loads and irregularities. Spring elements of equivalent stiffness are used to simulate the effect of nonlinear interaction between the piles and soil of high-rise Diaojiaolou. Research shows that the spring elements of equivalent stiffness can accurately simulate the seismic performance of high-rise Diaojiaolou. It is the most unfavorable state that the soil covers part of the long side of the Diaojiao plane, and the hanging legs exposed for a long time, which should avoid. The state of the soil covering the oblique angle part of the hanging legs has good lateral force stiffness.
Research on a Complete Set of Technologies for Assembled Residential Buildings with Steel-Structure Based on House Type Modularization and Component Standardization
Authors: Liu Yi-Feng , Luo Si-Shu , Wang Huan 
Published: April 2021

Abstract
The industrialization of assembled buildings with steel-structure is a major strategic demand in China nowadays in terms of the development of life cycle green buildings, the transformation and upgrading of housing industrialization, and the solution to steel industry overcapacity. Steel residential buildings have several advantages over traditional constructions: lightweight, good seismic performance, wind resistance, a high degree of prefabrication, rapid construction speed, and convenient construction; these are the factors promoting its rapid development in recent years. Based on the concept of house types modularization and parts standardization, the authors propose a series of standardized house types for assembled buildings with steel-structure, establish numerical evaluation method and optimization method of standardization rate based on Building Information Modelling(BIM). In this regard, we develop and rank performance criteria for assembled buildings by calculating the rate of prefabrication. Also, this study develops a complete set of technologies for the building envelope system, facility and pipeline system, and interior decoration system that matches with the structure system. Meanwhile, we apply the research results to engineering projects in practice and examine their applications. This research has proved useful for architects by providing a set of equations to evaluate the number of standardized parts.
Experimental Research and Finite Element Analysis on Blast Damage of Unreinforced Steel Fiber Concrete T-beam Structures
Authors: Peng Sheng , Wang Junyu , Cai Lujun , Jiang Tianhua , Han Fei 
Published: April 2021

Abstract
To reveal the dynamic behavior and damage mechanism of unreinforced concrete T-beam bridge under blast loads, three specimens were designed. Dynamic strain, acceleration and acoustic velocity pro- and post-blast of three specimens were measured respectively, and the generation, development process and distribution condition of cracks were investigated. The results indicated that ribbed slab fracture failure was a key to the unstable failure of the whole T-beam bridge specimen. Adding steel fiber evenly to the T-beam bridge deck can change the degree of blast damage from “severe damage” to “moderate damage”, which improves the explosion anti performance of the bridge structures. The damage evaluation results provide the basis for damage repair and reinforcement treatment after explosion.
Experimental Study on Shear Behavior of Fiber Reinforced Concrete Beams with Corroded Stirrups
Authors: Zou Zhenghao , Yang Guojiao 
Published: April 2021

Abstract
Through orthogonal test design, the influence factors of shear behavior of fiber reinforced concrete beams under different stirrup corrosion levels are studied. Three factors water cement ratio (A), fiber type (B) and fiber content (C) are determined, each factor contains three levels. 27 reinforced concrete beams of equal height and width with 3 corrosion levels were designed and subjected to continuous loading test after accelerated corrosion by electrification. According to the test results, the influence curve of each influencing factor on the test index is drawn, and the influence order of each influencing factor on the test index is determined according to the range analysis method.
Low Cycle Response Analysis of Welded Aluminum Alloy Box Castellated Beam
Authors: Li Chenghua , Gao Yalin , Yang Kaiyuan , Wang Xi 
Published: April 2021

Abstract
Welding aluminum alloy 6061-t6 aluminum alloy material is more and more widely used in construction engineering due to its light weight and high strength characteristics. Welding aluminum alloy box Castellated beam has great application value due to its unique section characteristics, in order to obtain more low cycle response curve of welding aluminum alloy box Castellated beam. In this paper, the constitutive relationship of domestic 6061-T6 aluminum alloy was obtained by laboratory test, and the finite element results were verified by low-cycle cycle test and full-scale test. ANSYS software is used to simulate the mechanical response of four welded aluminum alloy box Castellated beams under low cyclic load. The numerical results show that the hysteretic curves of aluminum alloy specimens are full, the pinching phenomenon is not obvious, and the welded aluminum alloy box Castellated beam shows strong overall stability. The seismic performance of welded aluminum alloy box Castellated beam is mainly controlled by expansion ratio, web height to thickness ratio and flange width to thickness ratio.
Corrosion Research and XCT Investigation of RC under Different Artificial Environment Simulation
Authors: Zhang XG , Zhao XY , Chen Y , Wang J 
Published: April 2021

Abstract
In this experiment, the common electric accelerated corrosion and drying-wetting cyclic corrosion test are compared, and the influencing factors (diameter of steel and thickness of protective layer) of the two corrosion methods are analyzed. When the constant current density was 100uA/cm2, the cracking time of the protective layer of the wetting-drying test samples was about 4 times that of the electrified test samples. For the two kinds of acceleration experiments, the cracking time of the protective layer increases with the increase of the diameter of the reinforcement and the thickness of the protective layer. Under the condition of accelerated corrosion by electrification, the diameter of reinforcement has a great influence on the cracking time of the protective layer, while the thickness of the protective layer has a relatively small influence. Under the condition of accelerated drying-wetting cyclic corrosion, the thickness of the protective layer has a great influence on the cracking time. The influence of the diameter of reinforcement is not obvious. In addition, we further explored the specimen with XCT. The rust patterns of the two samples are different.
Experimental Investigation on the Mechanical Properties of a Noval Bond-Type Anchorage for Carbon Fiber Reinforced Polymer Tendons
Authors: Ju Shiyuan , Zhou Zhi , Li Dongsheng 
Published: April 2021

Abstract
In order to effectively alleviate the stress concentration phenomenon of the inner-cone bond type anchorages and improve the ultimate anchoring capacity of the anchorages, a new kind of arcuate-cone bond type anchorage for carbon fiber reinforced polymer (CFRP) tendons was designed. The stress distribution curves, load-slip curves and failure modes of anchorages are obtained by tension test of a group of innner cone and arcuate cone anchors with different parameters. According to the test results, the influence of anchorage types, inclination angles and radius of arc on anchorage performance is analyzed. The results show that ultimate anchoring capacity is directly proportional to the slip between anchor cup and grout during loading. The slip of arcuate cone anchorage is larger than that of inner-cone anchorage, and the anchor with smaller inclination angles of anchor cup slips larger. The ultimate anchoring capacity of the novel arcuate cone bond-type anchorages is larger than that of the traditional inner cone anchorages, and the phenomenon of stress concentration on the surface of CFRP tendons is effectively alleviated by using arcuate cone anchorages.
Experimental Study on Flexural Toughness of Steel-Polyvinyl Alcohol Hybrid Fiber Reinforced Concrete
Authors: Su Ningyue , Fan Xiaochun 
Published: April 2021

Abstract
In order to study the flexural toughness of Steel(S)-Polyvinyl Alcohol (PVA) Hybrid Fiber reinforced Concrete, 10 specimens of hybrid fiber reinforced concrete with dimensions of 100 mm × 100 mm× 400 mm were studied by four point bending test. The load-deflection curve of hybrid fiber reinforced concrete beam was obtained, and its toughness was evaluated by flexural toughness index method. The results showed that the simultaneous incorporation of steel fiber and PVA fiber greatly improves the ultimate load and toughness index of concrete during bending failure, and fiber concrete has obvious strain hardening phenomenon. When PVA fiber volume content is 0.75% and steel fiber volume content is 1.25%, hybrid fiber concrete shows good positive hybrid effect, which is the most ideal to improve the bending performance of concrete matrix. And the research conclusion provides reference for the design and engineering application of hybrid fiber concrete.
The Micro Analysis and Influence of Nano SiO2 on High-Temperature Compressive Performance of Steel Fiber Reinforced Concrete (SFRC)
Authors: Yan Lan , Ming Xing Yong , Wen Li Shi , Li Jijun 
Published: April 2021

Abstract
This paper investigated the compressive strength of the normal concrete (NC), the steel fiber reinforced concrete (SFRC), the Nano normal concret (NNC) and the Nano-steel fiber reinforced concrete (NSFC) at the high temperature. On the other hand, Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD) were used to analyse Micro-Structure and Matrix phase structure at different temperatures. Results presented that the peak values of compressive strength of four types of concrete under high temperature appeared under 200°C.The compressive strength of NSFC was 77.45 Mpa under 200°C, respectively being 1.13, 1.21 and 1.34 times of those of SFRC, NNC and NC. Nano SiO2 could go through secondary hydration reaction with cement hydration product Ca(OH)2 so as to reduce Ca(OH)2 content and refine Ca(OH)2 crystals, transform Ca(OH)2 having adverse effect on strength into C-S-H gels and improve structural compactness. Therefore, addition of nano SiO2 could obviously improve high-temperature compressive strengths of the concrete, and it especially played a significantly role in improving compressive strength of SFRC.
Research on Hygrothermal Property of Jute Woven Fabric Reinforced Composites
Authors: Luo Changtai 
Published: April 2021

Abstract
Jute woven fabric reinforced composites are manufactured by means of VARI technology, hygroscopic property changes in the composites is analyzed, and the influence of hygrothermal aging on their tensile performance is investigated. The results show that moisture uptake of the composites at stage one conforms well to Fickian diffusion. Based on experimental data, the correlation between diffusion coefficient and temperature in Fickian equation is corrected. Meanwhile, the mild deviation between experiment-based moisture uptake curve and the one predicted by the modified equation validates the effectiveness of the correction. In addition, as temperature increases, the tensile strength of the composites decreases, due to the intensification of the resin dissolution.
Mechanical Properties of Geopolymer Concrete with Modified Calcium and Magnesium
Authors: Wu Xinyan , Jiang Lubing , Zheng Guoping 
Published: April 2021

Abstract
Geopolymer concrete has better mechanical property and environmental advantages than ordinary Portland concrete. Different amount of fly ash, Ca, Mg and the proportions of mixing ingredients are researched in this paper. Contrast by mixing different ratio of calcium to magnesium (Ca-to-Mg) into the geopolymer concrete, the mechanical property was researched. The compress experiment was fulfilled, moisture reduction was measured. The experimental results show modified geopolymer concrete with Mg/Ca can enhance the ability of water retention. The compressive strength of geopolymer concrete enhanced when ratio of Mg-to-Ca was 1:1. The peak compressive strength of geopolymer concrete reached 43.7MPa when MgO and slag occupied 133% fly ash. Slag can obviously improve the mechanical properties of the geopolymers. Modified proper ratio of Ca-to-Mg can improve mechanical performance of the geopolymer gels by 52%-1461%.
Study on Buckling Behavior of Glass Fiber Sandwich Structure
Authors: Chen Ru , Liu Xinhang , Hu Cong , Yang Xu , Wu Ye 
Published: April 2021

Abstract
A range of glass fiber sandwich structures were manufactured utilizing VARI technology and hydrothermal accelerate aging tests were carried out for them at four temperatures (25°C, 40°C, 55°C, 75°C) with three durations (10 days, 20 days, 30 days). Subsequent buckling tests on these structures recognized the principal failure mode as overall buckling, additionally, interface debonding and foam shearing were observed, moreover, the maximum load value is negatively related to the above two hydrothermal parameters and decreased by 19.53% and 17.27% respectively after 30-day aging and the exposure at 75°C. Furthermore, SEM images of the structures’ surface suggest that as temperature and time increase, the resin dissolution are escalated contributing to more distinct undermining of buckling capacity.
Creep of Fly Ash Concrete under Sulfate Attack Based on Consolidation Theory and Damage Theory
Authors: Cao Jian , Xiao Junjie , Han Ziyang , Xu Bin 
Published: April 2021

Abstract
This paper focuses on the creep characteristics of fly ash concrete corroded by sulfate. Firstly, based on the existing research, combined with the creep consolidation theory of concrete, the creep prediction model of fly ash concrete suitable for corrosive environment is analyzed. Secondly, through the analysis of the progress of sulfate corrosion of fly ash concrete, the concept of damage degree in damage theory is introduced to establish the creep calculation model of sulfate corrosion of fly ash concrete. Finally, the calculated value of the model is compared with the test value. The results show that the calculated value of the model is in good agreement with the experimental data and are consistent with the creeping growth trend.
Corrosion Behavior of Chemical Oxidation Film of Magnesium Alloy in NaCl Solution
Authors: Cheng De , Wen Chen , Bai Jingying , Qin Yeshen , Jiao Baocheng 
Published: April 2021

Abstract
Magnesium alloy chemical oxidation is a commonly used conductive anti-corrosion treatment method for aerospace. In order to study the corrosion resistance of its chemical oxide film in the coastal launch site and evaluate the impact of the marine environment on its surface film performance, the corrosion properties of magnesium specimens were studied in 3.5% NaCl solution. The corrosion characteristics with different immersion time were characterized by using scanning electron microscopy, energy spectroscopy and electrochemical methods. The corrosion mechanism was discussed. The results showed that as the immersion time increases, corrosion starts from pitting. The pit spreads to the morphology of multi-pronged extension cracks and then continues to deepen and widen, gradually covers the entire surface of the specimen. The corrosion products are mainly composed of magnesium and oxygen. The electrochemical results show that as the corrosion time increases, the corrosion rate increases from 0h to 12h, which the Icorr increases and the reaction resistance decreases. However, as the corrosion products cover the surface which prevents the corrosion expanding, the Vcorr trends to forward shift and reaction resistance increases.