bluuebunny/crossref_metadata_2025 huggingface dataset:
Possibilities of adjuvant use of a combination of butyric acid and inulin in antibacterial therapy of inflammatory diseases of the pelvic organs
Authors: Borzykh Evgeniia V. , Sviridova Tatiana N. , Lomanova Galina A. , Alexeev Nikolay I. , Olkhovik Irina I.
Published: November 2022

Aim. To evaluate the efficacy and tolerability of antibiotic therapy in patients with pelvic inflammatory disease during the use of a fixed combination of butyric acid and inulin (Zakofalk) as an adjuvant therapy.
Materials and methods. The study included 60 patients with inflammatory diseases of the pelvic organs who underwent antibiotic therapy. The diagnosis was confirmed by an objective examination, ultrasound of the pelvic organs, the results of a smear from the cervical canal. After inclusion in the study, the patients were randomized into 2 groups: the main group received standard antibiotic therapy and Zakofalk, the control group received only standard antibiotic therapy.
Results. The incidence of dyspeptic symptoms in the first week of observation in the main and control groups did not differ significantly. When comparing the severity of antibiotic-associated side effects in the second week of observation, statistically significant differences (p0.01) were found in terms of: bloating, rumbling, stools up to three times a day, which were more common in the control group. In addition, a more significant decrease in the level of leukocytes in the cervical mucus was recorded in the main group compared to the control group. The absence of pathogenic and opportunistic pathogens in the first control study, in comparison with the primary diagnosis, was also more pronounced in the main group. Adherence to treatment in the control group, 3.8 points on the MoriskyGreen scale insufficiently adherent, was lower than in the main group 5 points compliant.
Conclusion. The inclusion of Zakofalk as an adjuvant drug in the antimicrobial therapy regimen for pelvic inflammatory diseases improves the tolerability of this type of treatment, prevents the aggravation of symptoms of idiopathic antibiotic-associated diarrhea, increases the effectiveness of eradication of the pathogen and contributes to the normalization of the vaginal microbiota.
Features of various methods of surgical treatment of kidney cysts
Authors: Simonov Pavel A. , Firsov Mikhail A. , Laletin Dmitrii I. , Alekseeva Ekaterina A. , Sukhoverkhov Andrei O.
Published: November 2022

Background. According to foreign and domestic authors, a kidney cyst is one of the most common urological diseases and accounts for up to 2050%.
Aim. To evaluate the results of various methods of surgical treatment of patients with kidney cysts.
Materials and methods. An analysis was made of 124 case histories of patients who underwent inpatient treatment for symptomatic kidney cysts at the urology department of the Regional Clinical Hospital for the period 2016 to 2019. Also, an analysis of 50 case histories of patients who were hospitalized with the same diagnosis on the basis of the urological department of the emergency hospital for the same period.
Results. Puncture methods of treatment were used only in patients whose cysts radiologically corresponded to categories I and II according to Bosniak. On the basis of the urological department of the emergency hospital, 50 people were operated on in this way, of which 22 (44%) women and 28 (56%) men. The mean age of the patients was 58.25 years. Punctures of cysts with evacuation of contents without sclerotherapy 3 (6%) cases, and puncture of cysts with sclerotherapy with 96% ethyl alcohol 47 (94%) cases. The average age of patients who underwent surgery in the regional hospital was 56.612 years. According to MSCT, cysts of category I according to Bosniak were diagnosed in 96 patients (77.4%), category II in 11 (8.9%), category IIF in 11 patients (8.9%), category III in 6 (4.8%). Laparoscopic excision of the cyst wall was performed in most cases 109 (88%), laparoscopic nephrectomy was performed in 1 case (0.8%), laparoscopic nephrectomy in 10 (8%) cases, retroperitoneoscopic excision of the cyst wall 1 (0.8%), open intervention by lumbotomy access 3 (2.4%), of which nephrectomy was performed in two patients, one patient underwent kidney resection.
Conclusion. Surgical treatment of symptomatic kidney cysts was justified and necessary, as evidenced by the relief of symptoms and verification of cysts suspicious in terms of the likelihood of oncological pathology. Puncture methods of drainage and sclerotherapy are less radical, but justified in patients with high surgical risk. Excision of a cyst or resection of a kidney by laparoscopic access is an effective method of treatment that meets modern safety requirements for treatment.
Etiological factors of voiding disorders in females
Authors: Kosova Inga V. , Barsegian Vagan A. , Loran Oleg B. , Sinyakova Liubov A. , Luk'ianov Igor' V. , Kolbasov Dmitrii N. , Kruzhalov Aleksandr N. , Alieva Malakhat I.
Published: November 2022

Background. Voiding disorders in females are a serious medical and social problem. Various urological, gynecological, and neurological factors contribute to the development of these disorders.
Aim. To study etiological factors of voiding disorders in females.
Materials and methods. A total of 52 women 19 to 81 years of age with various voiding disorders were inspected. Examination algorithm included collection of a comprehensive medical history, filling in voiding diaries, gynecological exam, various laboratory tests (including PCR-diagnostics of urethral scrapings; ELISA tests for IgM and IgG to herpes simplex virus types 1 and 2, Varicella Zoster virus, EpsteinBarr virus, cytomegalovirus; vaginal discharge culture for flora and sensitivity to antibiotics, with mandatory determination of the lactobacilli count) and diagnostic methods, as well as consultations by related specialists.
Results. Chronic herpesvirus infection contributed to urinary dysfunction in 28 (53.8%) women, bacterial urinary tract infection in 15 (28.8%), bacterial vaginosis in 15 (28.8%), papillomavirus infection in 12 (23.1%), and interstitial cystitis in 10 (19.2%) patients. Thirty-five (76.9%) women had several simultaneous factors that contributed to the development of voiding disorders.
Conclusion. The combination of disorders of the vaginal microflora with viral and/or bacterial infections most often contributes to the development of voiding disorders.
Prospects for the use of autologous platelet-rich plasma in reproductive medicine. Analysis of literary data
Authors: Zabrodina Yuliya V. , Akhmedyanova Gainyl U. , Khamidullina Zaituna G.
Published: November 2022

A brief review of the literature summarizing PubMed (MEDLINE) data is presented, which describes the use of autologous platelet-rich plasma in reproductive medicine. The main biologically active factors included in the composition of platelets are indicated: vascular endothelial growth factor, transforming growth factor, platelet growth factor and epidermal growth factor. The main biological changes occurring under the action of platelet activation are noted: control of migration, differentiation and proliferation of cells, accumulation of extracellular matrix, etc. The main methods and methods of using autologous platelet-rich plasma in the treatment of patients with thin endometrium are described, the main advantages of this method are indicated. The prospects of using this therapy in reproductive medicine for the purpose of effective treatment of patients with infertility are shown.
Iron deficiency in women: ways to reduce prevalence
Authors: Vinogradova Maria A.
Published: November 2022

Iron deficiency states (IDSs) are common disorders at the nexus of various fields. The etiology and pathogenesis of IDSs have been well studied in recent decades, but their prevalence is still high. The highest incidence of IDSs is reported in women of reproductive age. The timely correction of iron deficiency improves women's quality of life and reduces pregnancy complications and infant morbidity. To achieve and maintain the improvement, caution in risk groups, early diagnosis, physiology-based therapy, and follow-up are necessary. Iron sulfate agents are well known as an effective way to treat iron deficiency anemia. However, the high rate of previously reported side effects posed significant challenges to the complete course of therapy. The development of a new molecule with prolonged iron release minimizes the complications of therapy, providing new prospects for iron deficiency treatment. The combination of folic acid to iron sulfate in one tablet simplifies prevention regimens and therapy for pregnant women and those planning to become pregnant and reduces the time to improve.
Federal innovation platform: reproductive health of 1st year students of Smolensk State Medical University
Authors: Minchenkova Ekaterina A. , Gustovarova Tatyana A. , Kirakosyan Larisa S. , Krikova Anna V. , Dmitrieva Elena V.
Published: November 2022

Aim. To study the state of reproductive health of female students of Smolensk State Medical University according to the 2020 monitoring data. To analyze the real picture of sexual life and reproductive health of first-year female students. To consider the necessity of including additional medical examinations in the dispensary monitoring plan.
Materials and methods. We examined 507 first-year female students aged 1827 years at Smolensk State Medical University. The examination included the collection of complaints, general and obstetric-gynecological history, questionnaires, gynecological examination, general clinical examination, pelvic ultrasound, microscopic and oncocytological smears, pH-metry of vaginal secretions, colposcopy. Statistical data processing included methods of descriptive statistics. Construction of the 95% confidence interval was done according to the formula for fractions and frequencies by the Wald method. Significance of the difference between the studied features was assessed using Fisher's angle transformation. Statistical significance was considered at 95% (p0.05) and 99% (p0.01) probability. Statistical analysis of the results was performed in Microsoft Excel 2016 using the AtteStat 12.0.5.
Results. The examination of female students of Smolensk State Medical University revealed reproductive health disorders and lack of awareness of modern contraceptives. The study concluded that an ultrasound examination of the ovarian tract, colposcopy, endocrinologist consultation, examination of hormonal background, and STI examination should be added to the plan of dispensary observation.
Conclusion. The data obtained in the course of the present study indicate that modern first-year female students have an insufficient level of reproductive education that does not meet the requirements of our time. In our opinion, the scientific and practical project will help to increase competence and responsibility in health saving issues to improve and strengthen reproductive health, to develop and implement a set of measures in the form of clinical and diagnostic research of the reproductive system, informational and educational lectures on the prevention of abortion, infertility and other diseases, sexual education, and in the future to affect the demographic situation.
Objeto de estudio de la ingeniería física
Authors: Castaño Bernal Jose Luis , Bernal Vera María Elena , Castaño Ramírez Elmer
Published: November 2022

Análisis sobre el “objeto de estudio” de la ingeniería física. Desde un análisis documental que parte de un recorrido histórico por los elementos que constituyen la profesión, su ontología desde la ingeniería y diferencias y similitudes entre ingeniería, ciencia y técnica concurre en sugerir una propuesta sobre las esencias a estudiar con cimientos filosóficos que puedan ser asumidas por estos programas (Objeto: del latín ob-jectum: puesto frente a; aquello que la disciplina estudia y transforma por su acción)
Cooperative play: A strategy for increasing environment care of the early childhood
Authors: Khoiriyah Khoiriyah , Atniati Ika
Published: November 2022

Environment care is a behavior should belong to children from an early age, because this period is a milestone that will shape and color the development of the next age. One of the strategies to increase awareness and care of for the environment is through a process of habituation with a cooperative play approach. The cooperative play through habituation carried out in this study such as: disposing of trash into its place by playing maze where the children look for trash bins, sort the stages of planting ornamental plants and collage using plants, forming plants with plasticine, and playing colors by stamping and coloring plants. This research aims to describe the efforts to instill and improve an attitude of environment care for children. This research is an action research with 16 children as the subject. In connection with the condition of the Covid-19 pandemic, data was collected through video observations and notes based on documentation of activities. The action was carried out in 2 cycles with the results of 81.25%. The success of children appears where they are able to dispose trash into its place, to conserve plants by watering them, to grow plants, and to save water.
Geometry fun circuit play for children's geometric shapes recognition
Authors: Savira Savira , Khosiah Siti , Kusumawardhani Ratih
Published: November 2022

Geometric shape recognition ability is among preschool children's cognitive development indicators. It is necessary to design an innovative method to stimulate their cognitive development through play, such as geometry fun circuit play. However, this play needs further security on its effects on children's geometric shape recognition ability. The present study attempted to test the effect of geometry fun play on preschool children's geometric shape recognition. A quasi-experimental study with a non-equivalent control group design was applied involving thirty participants. The experimental and control groups in this study showed a significance value of <0.001, meaning that the geometry fun circuit play significantly affects preschool children's geometric shapes recognition. Geometry fun circuit play is recommended as one of the alternatives parents, and teachers can use for stimulating preschool children's cognitive development.
DISASTER RISK FINANCING AND INSURANCE: HOW FAR HAVE WE KNOWN?
Authors: Adhasara Amalia , Qadri Resi Ariyasa , Aprilia Rachma
Published: November 2022

Natural catastrophes have resulted in massive losses for Indonesia. The government lacks the capacity to pay all damages caused by the disasters. The purpose of this research is to map the literature on catastrophe risk finance and insurance, particularly in terms of financial instruments that can be deployed. The scoping review approach was used in this study to locate and map relevant material. The findings of this study revealed that there are still significant research gaps on the issue of catastrophe risk finance and insurance, beginning with the research aim, financial instruments mentioned, and research methodologies and procedures applied. This study is planned to serve as the foundation for future research on the subject of catastrophe insurance in developing nations.
Detection and impact of heat treatments on tetracycline residues in chicken
meats sold in Amman city, Jordan
Authors: Al Aboudi A.R. , Almashhadany D.A. , Al Hijazin M.
Published: November 2022

The use of antimicrobial drugs in poultry is an important public health issue owing to the
increased use of such compounds that may trigger harmful effects on consumers. This
study investigated the type and concentration of tetracyclines in poultry meat samples
collected from Amman city, Jordan. A total of 180 samples (breast muscles, livers and
kidneys) were randomly collected from the abattoir and screened qualitatively using the
Premi® test and quantitatively by High-performance liquid chromatography (HPLC) for
oxytetracycline, tetracycline and chlortetracycline. Approximately eighty-four (46.6%) of
the samples showed a positive result for the presence of tetracycline residues. Out of the
84 positively samples, parent drugs were identified in 12 (6.6%) muscle, 14 (7.7%) liver
and 13 (7.2%) kidney samples. Moreover, the samples that exceeded the maximum
residue limit were 4.4%, 5.0%, and 2.7% of muscle, liver, and kidney, respectively.
Freezing (-70°C for 90 days) and heat treatments (up to 90°C for 60 mins) did not
significantly reduce tetracyclines residue concentrations. Violative levels of antimicrobial
drug residues in different poultry tissues are still a public health issue. An extra-dosage
regimen or failure to meet the withdrawal times might stand behind the problem. Private
and governmental strategies to implement strict regulations on antimicrobial applications
in the poultry industry are highly recommended. Poultry producers should be informed
that the usage of antibiotics does not compensate for hygienic measures at farm levels.
Probabilistic Assessment of Vehicle Driving Safety under Strong Winds – Cause Investigations on Two Sea-Crossing Bridges
Authors: Kim Ho-Kyung , Cheon Hyeong-Yun , Kim Sejin
Published: November 2022

The strong side winds threaten the stability of running vehicles over the sea-crossing bridges due to the high altitude of the deck and free exposure to the upcoming winds. Therefore, bridge operators control the speed limit or close the bridges when the wind speed reaches predetermined criteria. Since the sea-crossing bridges play an essential role in transportation networks, the traffic control strategy, including complete closure, requires a careful assessment of the critical wind speed at which vehicle instability can occur. As the aerodynamic forces on vehicles depend on several influence factors, including the geometrical shape of the superstructure, the critical wind speeds variate bridge by bridge. This study demonstrates a framework to determine the critical wind speed. This study reports two overturning accidents experienced in a double-deck suspension bridge and a cable-stayed bridge. By applying the proposed framework to the cases, the authors successfully explained the cause of accidents. For this investigation, the authors used a wind tunnel measurement of aerodynamic loads on vehicles and the vehicle dynamics to determine critical wind speed curves. The authors also extended the procedure to the probabilistic risk assessment by adding the long-term wind data analysis of the bridge site. In this way, this study provides a guideline for bridge operators on balancing the driving safety and the continuous mobility of the sea-crossing bridges under hazardous high wind conditions.
Seismic and Tsunami Resiliency of Bridge and Transportation Structures
Authors: Khaleghi Bijan
Published: November 2022

Earthquakes can happen in Washington State at any time, and history indicates there may be substantial shifting of land during a seismic event. The State Department of Transportation’s manages approximately 18,500 highway lane miles and more than 3,600 bridges on the state’s highway system. One of the agencies objectives is to ensure that state highways will be able to provide emergency responders access to damaged portions of the community quickly to provide Recovery life-saving services. State Highways will also need to provide the capability for the state economy and the movement of freight and goods to be re- stored as quickly as possible.

In an earthquake, damage to infrastructure bridges is more closely related to ground motion rather than magnitude. In addition, the ground type can significantly influence ground acceleration. Base on the geographic area and historical data geologists can create seismic hazard maps which show likely earth-quake ground motion zones. This paper discusses the seismic design requirements for bridges and challenges to achieve these requirements for new and existing bridges.
Key Technology for the Design of a Cable-Stayed Bridge in a High- Intensity Area
Authors: Wu Yongxian , Sun Liming
Published: November 2022

The background project is Xiyan Bridge, Pingcheng Street, Datong city, Shanxi Province. The bridge crosses both railway marshalling yards and multiple important railway lines. The span arrangement is (41+50+163) m. The overall design, key structure design and calculation of the main bridge are introduced in detail for high intensity areas and for large spans with width and bidirectional asymmetric main girders. The main point is placed on the comparison, selection and analysis of the main tower as an all-steel structure and steel-concrete composite structure for its seismic system design. The linear control, weighing and counterweight scheme are simulated for the main construction process of the whole bridge without setting up the closing section of a rotating body on site. The calculation proves that the structure design is reasonable and that the construction is safe and reliable. It can provide a reference for the design and construction of similar bridges.
Cable Force Analysis of Extradosed Bridge Based on Comprehensive Optimization Method
Authors: Zhu Liming , Xiao Han , Chen Qinyu , Yi Chenyang
Published: November 2022

In order to determine the rational cable force of the extradosed bridge, a comprehensive optimization method of cable force is proposed. The method is based on the influence matrix method and adopts the data standardization method to change two or more different types of discrete data into dimensionless uniform data, with the objective of minimizing the combined displacement and bending moment of the structural control section. Relying on the extradosed bridge of Nanjing Intercity Rail Transit Ningju Line as an engineering example, the results show that the calculated cable force of the integrated optimization method can reduce the maximum compressive stress at the top and bottom edge of the main girder by 3.3 % and 3.8 %, respectively, compared with the original design cable force.
Design and Experimental Study of Steel Box-Concrete Filled Steel Tube Composite Cable Tower
Authors: Rengui Wang , Leyong Wei , Zhifa Yan , Jiansheng Fan , Chong Zhang , Hongtao Li , Jing Ruan , Haifeng Lin , Junping Dai , Feng Zhao
Published: November 2022

Steel box-concrete filled steel tube (BCFST) composite tower is a new type of tower structure proposed to be used in super-span suspension bridges. BCFST comprises of four concrete-filled steel tube (CFST) columns inside and a steel box outside. CFSTs and the steel box are connected with each other by steel webs and diaphragm plates. In this study, the combined compressive and bending loading experiments of the BCFST were conducted, and the ability of the composite tower section to deform together was studied. The experiment showed that the bottom section of the composite tower deviated from the plane section after deformation, and the other sections approximately maintained the plane section after deformation. The calculation method of the compression-bending capacity of the composite cable tower was proposed, which can provide a reference for the application of the composite tower in practical engineering.
Analysis on Mechanical Performance of Rail-Cum-Road Double Deck Steel Truss-Arch Composite System Bridge
Authors: Liu Bingfei , Su Qingtian , Li Dongxu , Ouyang Minggu
Published: November 2022

In order to research the mechanical performance of rail-cum-road double deck steel truss-arch composite system bridge, a rail-cum-road double deck steel truss-arch composite system bridge with 150m main span was analyzed. The overall spatial model of the bridge was established by using the general finite element software, and the structural response under dead load, vehicle load, rail transit load and temperature was calculated and analyzed. Dead load is the main factor causing the internal force of long-span composite system bridge. The stiffness of steel arch rib and steel truss is only 13.5% and 24% of the composite system, so the steel truss-arch composite system bridge has greater overall structural stiffness. In terms of dynamic characteristics, the overall stiffness of steel truss arch composite system bridge is great, the first five natural frequencies are all between 0.3Hz and 1.5Hz, and there is the possibility of simultaneous multi-mode excitation.
Recent Development and Challenges of Long-Span Railway Cable- Stayed Bridges in China
Authors: Guo Hui
Published: November 2022

The main span of railway cable-stayed bridge in China has broken through from 312m in 2000 to 1092m in 2020, with rapid development in recent years. It comes from aspects of new material, new structural form, accelerated bridge construction method, and innovated construction facilities and equipment. New materials mainly include bridge structural steel with higher yield strength, stay cable with higher tensile strength and ultra-high-performance concrete (UHPC), etc. New structural forms refer to three-main truss with three-cable plane, cable-stayed bridge with ballastless track system, multi-pylon railway cable-stayed bridge, etc. Concept of accelerated bridge construction has been also applied in caisson construction, truss girder assembling, truss girder hoisting, etc. Several new facilities and equipment have also been created such as integral bridge expansion joint, hoisting crane, and smart torque wrench, and so on. Challenges have also been discussed.
Advantages of New Type of Steel Box Coarse Aggregate Reactive Powder Concrete Composite Continuous Beam Bridge
Authors: Meng Jie , Chen Xiaohu , Liu Xueshan , Liang Bowen , Huang Haoxiang
Published: November 2022

Coarse aggregate activated powder concrete (CA-RPC) is a new modified material for the large- scale application of existing ultra-high-performance concrete (UHPC), which can improve the technical difficulties of existing materials such as harsh materials selection, high construction viscosity, large self-shrinkage, etc., and has the characteristics of ultra-high strength, low viscosity, low shrinkage, high toughness and high elastic modulus. Nanjing Lvdu Road bridge over New QinHuai River innovatively introduced coarse aggregate activated powder concrete and formed a new composite continuous beam bridge system with steel box. Through comparative analysis with the steel box- conventional concrete composite continuous girder bridge, prestressed concrete continuous girder bridge and other structural systems, the advantages of the new structural system such as large span lightweight, prefabricated assembly, and ecological environmental protection are expounded.
Experimental Design of Link Slab in Long-span Steel-Concrete Composite Bridge
Authors: Xiao Liang , Su Qingtian , Chen Zhiquan , Peng Tianbo
Published: November 2022

Link slab makes the steel girder simply supported and the bridge deck continuous. Therefore, it is a fine substitute for expansion joint in simply supported bridge. However, the application of link slab in long-span simply supported composite bridge is rarely reported. This paper attempts to introduce the link slab into long-span simply supported steel-concrete composite bridge. In order to study the static performance of the link slab, this research designs a full-scale I-shaped segment specimen and conducts a numerical analysis on it. The calculation results are compared with the full bridge model to verify its feasibility, preparing for a follow-up test.
Short Stud Arrangement Effect on Flexural Behavior of Steel-UHPC Composite Decks
Authors: Zhang Lepeng , Xiao Han , Xu Chen , Xu Yi , He Wuchao , Ma Biao
Published: November 2022

To investigate the effects of short stud arrangement on flexural behavior of steel-UHPC composite decks, a static bending test was conducted on a full-scale segmental specimen and a parametric analysis was executed based on a validated finite-element model. The test results showed that when UHPC crack width reached 0,10 mm, the measured strain of UHPC was 1568 με, accounting for 47% of the material ultimate tensile strain. And the corresponding nominal stress of UHPC was largely over the material cracking stress. The parametric analysis results showed that increasing stud spacing from 200 mm to 300 mm increased the UHPC cracking load by 9,7% because of a lower composite action; compared with the normal arrangement, studs arranged in groups with the same amount could increase the UHPC cracking load by 11,1% while maintaining the combined effect. However, this was under the condition that the steel and UHPC partially interacted.
Continuous Galvanized Reinforcing Steel in Concrete Structures
Authors: van Leeuwen M. C. , Lai Delin , Kong Gang , Gagné M.
Published: November 2022

Corrosion of steel reinforcing bar (rebar) is the most significant cause of concrete failure, resulting in expensive repairs, reduced load carrying capacity and premature replacement of concrete structures. This paper will discuss continuous galvanized rebar now available for concrete structures. The properties of this zinc coated rebar and its contribution to improvement of concrete performance will be presented together with the status of related national and international standards and applications in China. The Continuous Galvanized Rebar (CGR) coating process improves product consistency, increases through put and reduces costs. The zinc coating is durable and resistant to abrasion that is routine during transport and construction but is also highly ductile and can be formed after galvanizing to further reduce cost and speeding construction schedules. Once in the concrete, the zinc coating protects the rebar both as a barrier coating and with the well- known sacrificial properties of a galvanized coating.
Effect of Concrete Thickness on Fatigue Performance for rib-to-diaphragm in steel-concrete orthotropic composite decks
Authors: Wu Yu , Zeng Ming-gen , Su Qing-Tian
Published: November 2022

In order to study the effect of thickness of rigid pavement on the fatigue performance of orthotropic deck, the shell-solid finite-element model was established to analyze the stress on the opening area of diaphragms in orthotropic deck under different concrete thickness. The results show that with or without rigid pavement, the stress distribution of the bridge deck and the hot-spot stress at the opening area of the diapragm are significantly different. The stess amplitude at the diaphragm- opening area of the orthotropic steel bridge deck with rigid pavement is only half of that in orthotropic steel bridge deck without rigid pavement. The thickness of the concrete has a great influence on the fatigue strength of the opening area of the diaphragm in orthotropic steel bridge deck when the concrete thickness is no more than 100 mm.
Study on the Bearing Capacity of Grouted Connections with Shear Keys
Authors: Deng Ruiqi , Chen Tao , Li Zhuxuan
Published: November 2022

Grouted connection (GC) is an important part of the offshore wind turbine (OWT) support structure. There are a lot of axial compression tests of GCs. But in order to thoroughly study the effects of different parameters on GCs, it is necessary to carry out the numerical study with the finite element method (FEM). In this study, the local models of GC were established by using the FE software ABAQUS. The numerical results were verified by the experimental results. A parametric study was carried out to investigate the influence of grout thickness, lateral compressive stress, shear key spacing, and the number of shear keys. The study shows that increasing the lateral pressure and the number of shear keys can significantly improve the bearing capacity. While increasing the grout thickness within a certain range will reduce the bearing capacity. And increasing the shear key spacing within a certain range will improve the bearing capacity.
Finite Element Analysis of Local Pressure Failure Mechanism of RPC
Authors: Mohamed Elobaid Musa Moneef , Xueyu Xiong , Tim Sob Landry Wilfried , Alhaddad Wael , Uddin Md Nasir , Mahamoudou Faharidine
Published: November 2022

Reactive powder concrete (RPC) has been widely used due to its high tensile and compressive strength and excellent durability. However, the failure mechanism of RPC local pressure is still unclear. Therefore, reasonable structural dimensions of the finite element model (FEM) and the relevant parameters of the RPC were selected to deeply explore the local pressure of the RPC under the local loading. The FEM of the axial local compression of the RPC with different constitutive models was built. The whole nonlinear analysis process of the local pressure of RPC was completed, and the failure mode, stress distribution, and maximum plastic principal strain of the specimen were analyzed. The model shows that the local pressure performance of RPC is improved due to the increase of ultimate tensile strength, the local pressure failure mode of RPC conforms to the wedge split theory, and the orthogonal ties can uniformly distribute the pressure stresses.
Numerical Simulation on Seismic Performance of HPS-UHPFRC Composite Pier-foundation Embedded Joint
Authors: He Dandan , Wang Qian , Duan Lan , Wang Chunsheng , Cheng Feng
Published: November 2022

The assembled composite bridge pier with high performance steel (HPS) and ultra-high performance fibre reinforced cementitious composite material (UHPFRC) possess the advantages of factory production and good seismic performance. In order to improve the connection degree and seismic performance of pier-foundation embedded joint in HPS-UHPFRC composite pier, PBL shear connectors and UHPFRC were adopted in the embedded part. Numerical simulation was carried out on the seismic performance of the joint with PBL shear connectors and without the connectors. Besides, the parametric analysis of the main influencing factors was conducted, including the construction of PBL shear connector, embedded depth of the pier and material types of the joint. The influence laws were obtained through the comparisons, and reasonable suggestions were provided for the design of HPS-UHPFRC composite pier-foundation joint.
Analytical Study on Tubular Flange Girder Bridges Using High Strength Steel
Authors: Li Qingling , Ma Haiying , Shi Xuefei , Turmo José
Published: November 2022

Twin-I girder bridge systems are representative structures used in bridge industrialization construction. They have advantages including structure simplification, material save and accelerated construction, but the system using two main girders limits the span and makes the lateral effect more significantly. The general suitable spans range from 25m to 45m, which limits the use of twin-girder bridges. To increase the span limit, the use of tube as top flange and high strength steel can improve structure behavior and increase bridge spans. In the paper, parametrical study and structure optimization were conducted to investigate the behavior of tubular flange girder bridges using high strength steel. Parameters including cross-beam arrangement, stiffeners, tube size were studied. Comparisons between the systems using ordinary steel and that using high strength steel were conducted.
Research on wind field characteristics measured in U-shaped valley at bridge site by Lidar
Authors: Wang Jun , Li Jiawu , Hong Guang , Wang Feng
Published: November 2022

Currently, research on wind fields of U-shaped valleys is rarely reported. In order to study the wind characteristics in a mountainous U-shaped valley, a lidar was placed at a bridge site located in a U-shaped valley. Then, nearly 6 months of original data ranging from 0 m to 810 m were analyzed statistically. It was found that the wind parameters are correlated among different virtual wind towers (VWTs). The wind speed profile is divided into three categories: disordered, linear and nonlinear. The wind direction is consistent with the main wind direction at the bridge site and the average wind direction of different VWTs has a high consistency. The concept of wind-direction deflection rate is put forward to describe the variation of wind direction with height. These measured wind parameters could be used as a reference for bridge wind- resistant design.
Numerical Analysis of Bolted Connectors in Prefabricated Steel-Lightweight Aggregate Concrete Composite Beams
Authors: Wang Wei , Zhang Xie-dong , Xie Zhu-bing
Published: November 2022

This paper presented a three-dimensional (3D) numerical model to explore the shear behavior of bolt connections embedded in steel-lightweight aggregate concrete composite beams (SLACCBs) by utilizing the ABAQUS software. Nonlinear geometric effects and material nonlinearities were considered in the finite element (FE) modelling. The accuracy and reliability of the FE modelling were validated against the push-off tests initially. Subsequently, the basic shear properties of the bolted connection embedded in SLACCBs were studied and compared with that of the bolted connection embedded in the normal concrete (NC) slab by applying the verified FE modelling. Meanwhile, the effects of the concrete strength, concrete density, bolt diameter, and bolt tensile strength on the shear behaviour of bolt connection embedded in SLACCBs were also investigated by extensive parametric studies.
Design of pre-stressed intersecting cable string steel bridge
Authors: Dabrila Povilas , Juozapaitis Algirdas
Published: November 2022

The article presents the methodology for designing an innovative pre-stressed cable-stayed steel bridge structural system using intersecting cables and string. The behavior of this new structural system under the effect of permanent and temporary loads is also taken into account. The article also discusses the design of the components of this new type of structure and presents the calculation methodology of this structural system taking into account geometrical nonlinearity. Installation sequence variants of such a bridge are also considered as well as the influence of string and cable pre-stressing on bridge displacement and component stresses. Equations for calculating bridge string stresses and displacements are presented. The article shows how to design this new steel bridge system which is more effective than the typical cable-stayed bridge structure according to the mass criterion.
Numerical Fatigue Simulation of Access Hole Detail in Orthotropic Steel Bridge Deck
Authors: Wang Chunsheng , Mao Yubo , Li Puyu , Zhu Chenhui
Published: November 2022

In order to investigate the fatigue crack mechanism of growth and propagation at access hole detail in the orthotropic steel bridge deck, welding numerical model and multi-scale whole bridge numer- ical fatigue model were established. Based on linear elastic fracture mechanics and eXtend finite element model (XFEM), numerical fatigue simulation and mechanism analysis were carried out un- der the multi-filed coupling effect. Welding residual stress analysis results show that the high resid- ual tensile stress exists at welding hole edge, of which the maximum value located at the middle of the edge. The numerical simulation results show that stress intensity factor (SIF) range at access hole detail exceeded the fatigue crack propagation threshold under the multi-filed coupling effect. And fatigue cracks at access hole detail are mode I cracks.
Shrinkage and Fatigue Performance of Novel Post-Combined Steel- UHPC Composite Decks
Authors: Jiang Yang , Lu Yi , Xu Chen
Published: November 2022

Considerable UHPC shrinkage has an enormous impact on steel-UHPC composite deck. To this end, a novel post-combined orthotropic steel-naturally cured UHPC composite deck was proposed in this paper. Two full-scale segmental steel-UHPC composite decks, one normal while the other post-combined, were fabricated for shrinkage monitoring and fatigue loading tests. The monitoring results showed that shrinkage-induced secondary stress on the steel deck of the post- combined specimen was lower than that of the normal one. And the fatigue loading test results showed that there was no significantly worse damage on the rib-deck weld detail in the post- combined specimen. In other words, the post-combined method mitigated UHPC shrinkage restraint without obvious deterioration to fatigue resistance. It contributed to establishing an economical alternative that could effectively address the adverse shrinkage effect on a steel-UHPC composite deck.
Innovative Construction Technique of Two Bridges in Hong Kong
Authors: Chong Yau Hong , Sun Andrew Alexander , Hussain Naeem , Ho Eddie Ho Koon
Published: November 2022

The multi-storey Yuen Long Town development in Hong Kong is separated by a live Light Rail Track. To connect the two sides of the development, a footbridge and vehicular bridge has been constructed using a novel construction technique. The footbridge is a 45m long fully enclosed steel warren truss bridge located at a lower level and the vehicular bridge is a 50m long steel concrete composite bridge located at the top of the podium.

The erection of each bridge took 3 days. Both bridges were in turn assembled on top of the adjoining podium of the development. They were then connected to a turntable constructed at the edge of the podium and temporarily made into a cantilever cable stay bridge. In an overnight rail possession, the bridges were rotated 120 degrees over the railway. Temporary cables were then removed, and each bridge were lowered by strand jacks to the final level over the next two rail possessions.
Impacts of Supplemental Viscous Damping on Seismic Responses of Building Structures for Construction Extended Renovation Projects under Multilevel Decomposition Design Model Frame
Authors: Hu Daohang , Zhao Xin , Cai Jinlun
Published: November 2022

The installation of supplemental viscous damping devices can effectively reduce the seismic responses of the engineering structure, so as to reduce the construction quantity of the renovation project. This paper addresses the impacts of supplemental viscous damping devices on the seismic responses of the construction extended renovation projects under the multilevel decomposition design model frame. Firstly, the multilevel decomposition design model of the seismic design of engineering structures is introduced. Secondly, the typical driving factors of the construction extended renovation projects are discussed. The impacts of supplemental damping on the seismic response of the structure are then investigated from the perspective of response spectrum. This paper takes a 250m ultra-tall structure as engineering case to analyse the multilevel decomposition design model, the driving factors of the construction extended renovation projects and the impacts of supplemental damping on the seismic responses of the structure. The results show that the supplemental viscous damping can effectively reduce the construction quantity of renovation projects.
Flexible Protection Technology of Bridge Pier against Ship Collision
Authors: Wang Y. G. , Yang L. M. , Zhou F. H. , Chen G. Y. , Lu Z. I. , Zhuang D. I.
Published: November 2022

Bridges across navigation channels are under the threat of accidental ship collisions. Many research works have been conducted to investigate the crashworthy device against ship-bridge pier collisions. However, the existing bridge pier protection facilities, mostly based on absorbing ship kinetic energy, are large structures with high strength, resulting in large collision forces that may cause ship damage. In this paper, flexible anti-collision technology is developed, which protects the bridge pier based on the ship's course guidance principle, hence taking away the huge kinetic energy of the ship in the process of collision. The pier flexible crashworthy device has a compact structure and can greatly reduce the impact force of ships, protecting both the bridge and the ship. The reliability and effectiveness of the technology have been verified through off-shore impact tests.
Detection of Concrete Structural Surface Cracks Based on VQ-VAE-2
Authors: Liu Chao , Wu Jishu
Published: November 2022

The deep learning models can detect surface cracks of concrete structures efficiently, but training sets which include a great number of crack pictures generally are relied on when training the deep learning models. This paper presents a detection method based on VQ-VAE-2, an unsupervised learning model, which requires no cracks when trained. Firstly, a VQ-VAE-2 model is trained on a training set which only contain pictures of normal concrete structural surfaces. The VQ-VAE-2 model is expected to produce low reconstruction error for pictures of normal concrete structural surfaces and high reconstruction error for ones of concrete structural surface cracks. Then the reconstruction error of test set is computed by the VQ-VAE-2 as the judgment criteria. Lastly, the model is evaluated by precision, recall, F1 and accuracy. The result shows the method based on VQ-VAE-2 can achieve the crack detection without crack samples.
Structural Health Diagnosis Under Limited Supervision
Authors: Xu Yang , Li Hui
Published: November 2022

Structural health diagnosis has been investigated following a data-driven machine learning paradigm. However, the model accuracy and generalization capability highly rely on the quality and diversity of datasets. This study established a framework for structural health diagnosis under limited supervision. Firstly, an image augmentation algorithm of random elastic deformation, a novel neural network with self-attention and subnet modules, and a task-aware few-shot meta learning method were proposed for vision-based damage recognition. Secondly, deep learning networks were established to model intra- and inter-class temporal and probabilistic correlations of different quasi-static responses for condition assessment. Finally, a two-stage convergence criterion merging with the subset simulation and Kriging surrogate model was designed for reliability evaluation. Real-world applications on large-scale infrastructure demonstrated the effectiveness.
Unit influence surface identification of long-span bridge based on spatial-temporal vehicle load monitoring
Authors: Dong Yiqing , Wang Dalei , Ma Yunlong , Pan Yue
Published: November 2022

On-side bridge unit influence surface (UIS) calibration traditionally relied on the vehicle load test, which is expensive, time-consuming and traffic-interruptive, especially for long-span bridges. This paper proposes a novel method for bridge UIS identification based on the vehicle load monitoring. By employing a multi-vision system and computer vision algorithms, the distribution of the vehicles on the bridge deck is obtained. Then the data fusion between the vision system and weigh-in-motion (WIM) system is implemented to acquire the spatial-temporal vehicle loads on the deck. In the meanwhile, the deflection of the main-span is also obtained by the SHM system of the bridge. Thus, by means of the iterative computation and surface fitting, the UIS of the deflection is identified. The proposed method is arranged and applied to a practical long-span suspension bridge. Results have shown the feasibility of the method.
Response Reconstruction Based on a Multi-End Convolutional Neural Network
Authors: Ni Peng , Xia Ye , Sun Limin
Published: November 2022

Structural health monitoring (SHM) techniques evaluate the state of the structures and detect damages based on the analyses of the monitored responses. As the measurement of all target responses can be difficult due to various limitations, reconstructing the target responses using measured data is necessary. To reconstruct the response data in the field of structural health monitoring, this paper proposes a multi-end deep convolutional network with an encoder-decoder structure and skip connections. The responses are computed by the finite element model and then divided into the training set. The proposed network model is trained to map the relationships among the various responses of involved positions. Varied measured data can be fused to reconstruct different desired responses at multi-position, leveraging a single network. Two numerical simulations are conducted to demonstrate the proposed method's applicability.