Transport and Communications Science Journal最新文献_第7页

Nghiên cứu đặc trưng ngọn lửa và xác định áp suất khí trong khoang cháy của máy đốt nóng mặt đường 研究火焰特性，确定燃烧室内空气压力

Transport and Communications Science Journal Pub Date : 2023-06-15 DOI: 10.47869/tcsj.74.5.9

Dũng Nguyễn Văn, Bính Nguyễn

{"title":"Nghiên cứu đặc trưng ngọn lửa và xác định áp suất khí trong khoang cháy của máy đốt nóng mặt đường","authors":"Dũng Nguyễn Văn, Bính Nguyễn","doi":"10.47869/tcsj.74.5.9","DOIUrl":"https://doi.org/10.47869/tcsj.74.5.9","url":null,"abstract":"Máy đốt nóng mặt đường sử dụng nguồn nhiên liệu khí gas để đốt nóng tấm gốm sau đó bức xạ nhiệt xuống mặt đường làm mềm hóa lớp bê tông nhựa (BTN) phục vụ quá trình sửa chữa mặt đường. Tuy nhiên để nâng cao hiệu quả của ngọn lửa trong khoang cháy và tránh cho ngọn lửa đốt trực tiếp xuống mặt đường thì cần phải nghiên cứu các thông số đặc trưng của ngọn lửa phù hợp với kết cấu khoang cháy của máy. Bài báo trình bày hai vấn đề: một là nghiên cứu đặc trưng của ngọn lửa khí gas trong khoang cháy để xác định mối quan hệ giữa chiều dài và nhiệt độ ngọn lửa; hai là tính các tổn hao áp suất trong quá trình đốt nhiên liệu để xác định áp suất thực tế của hỗn hợp khí cháy trong khoang cháy của máy đốt nóng mặt đường. Đây là cơ sở khoa học cho việc xác định các thông số để thiết kế bộ phận đốt nhiên liệu của máy đốt nóng mặt đường.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129999540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ảnh hưởng của khuyết tật hình học và tính chất vật liệu lên sức kháng mất ổn định cục bộ cột FRP 几何缺陷和材料特性对FRP柱局部失稳阻力的影响

Transport and Communications Science Journal Pub Date : 2023-06-15 DOI: 10.47869/tcsj.74.5.5

Thủy Nguyễn Tiến

{"title":"Ảnh hưởng của khuyết tật hình học và tính chất vật liệu lên sức kháng mất ổn định cục bộ cột FRP","authors":"Thủy Nguyễn Tiến","doi":"10.47869/tcsj.74.5.5","DOIUrl":"https://doi.org/10.47869/tcsj.74.5.5","url":null,"abstract":"Vật liệu polyme gia cường sợi sản xuất bằng phương pháp đúc kéo (Pultruded Fiber Reinforced Polymer - PFRP) ngày càng được sử dụng phổ biến trong lĩnh vực xây dựng do giá thành hợp lý, cường độ cao, trọng lượng nhẹ, khả năng chống ăn mòn tốt, thi công thuận tiện. Do modun đàn hồi thấp và ứng xử tuyến tính đến phá hoại, thiết kế của vật liệu này thường bị khống chế bởi ổn định. Mất ổn định cục bộ của cột xảy ra khi các bản chịu nén của cấu kiện bị oằn theo kiểu lượn sóng. Nghiên cứu này phân tích tải trọng gây oằn tới hạn và sức kháng sau oằn của cột PFRP có tính đến khuyết tật về tính chất vật liệu và khuyết tật hình học. Kết quả cho thấy, khuyết tật hình học có ảnh hưởng rất lớn đến tải trọng gây oằn và làm suy giảm nghiêm trọng sức kháng sau oằn của cột. So sánh phân tích ổn định phi tuyến với tính toán lý thuyết của Kollár và giá trị thực nghiệm cho thấy công thức của Kollár là phù hợp khi xác định tải trọng gây oằn cục bộ. Tác giả đề xuất sử dụng công thức này để xác định sức kháng ổn định cột trong tính toán thiết kế cột PFRP chịu nén.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127947657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analytical truss model for concrete beams reinforced with FRP bars FRP筋混凝土梁的解析桁架模型

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.6

Ngoc Tran Cao Thanh

{"title":"Analytical truss model for concrete beams reinforced with FRP bars","authors":"Ngoc Tran Cao Thanh","doi":"10.47869/tcsj.74.4.6","DOIUrl":"https://doi.org/10.47869/tcsj.74.4.6","url":null,"abstract":"A truss model supplementing the concrete contribution is introduced in this paper to predict the shear strength of concrete beams reinforced with various types of FRP bars. The contributions from truss and direct strut mechanisms are considered in the analytical model. The truss model which has struts at various angles considering concrete contribution is derived in this paper. The concept of equivalent transverse FRP reinforcement is applied to integrate the concrete contribution into the proposed truss model. The shear strengths of concrete and FRP transverse reinforcements in the proposed model are calculated based on El-sayed et al. and CSA S806, respectively. The validity and applicability of the proposed model are evaluated by comparison with available experimental database, which consists of concrete beams reinforced with glass, carbon, aramid and basalt FRP bars. The comparison has shown a good correlation between the experimental data and analytical results. The proposed model is also compared with ACI 440.1R and CSA S806’s shear strength models and the better correlation is found. The results from this research shows that the properly-treated truss analogy can be used to assess the shear strength of concrete beams reinforced with various types of FRP bars.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134356289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilizing artificial neural networks to anticipate early-age thermal parameters in concrete piers 利用人工神经网络预测混凝土桥墩早期热参数

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.5

Hải Hoàng Việt, Tú Đỗ Anh, Thọ Phạm Đức

{"title":"Utilizing artificial neural networks to anticipate early-age thermal parameters in concrete piers","authors":"Hải Hoàng Việt, Tú Đỗ Anh, Thọ Phạm Đức","doi":"10.47869/tcsj.74.4.5","DOIUrl":"https://doi.org/10.47869/tcsj.74.4.5","url":null,"abstract":"Recently, researches have been used Artificial Neural Network (ANN) to predict the early-age thermal cracking of rectangle piers. But ANN has not resulted for different types of concrete piers. This article presents an evaluation of the early-age thermal characteristics of mass concrete piers with four distinct cross-sectional shapes. A finite element (FE) model was employed to estimate the maximum temperature, thermal stress, and cracking potential of the concrete pier at its early age. To investigate the impact of various pier geometries on the thermal cracking potential, different pier geometries were considered. In this study, an ANN model was utilized to predict the maximum temperature and decrease the risk of cracking in mass concrete piers at early age. The database of thermal mass concrete piers used in this study comprises 128 results obtained from the FE model. The results of the analysis indicate that the ANN model can predict early-age thermal parameters, and cracking risk in early-age concrete piers with good accuracy and help to the designer to choose the appropriate size in minimizing cracks on the pier concrete.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132848274","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Study on distress of airport pavement foundation and solution applied to Noi Bai international airport 内白国际机场机场路面基础病害及解决方案研究

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.8

Hiep Nguyen Trong

{"title":"Study on distress of airport pavement foundation and solution applied to Noi Bai international airport","authors":"Hiep Nguyen Trong","doi":"10.47869/tcsj.74.4.8","DOIUrl":"https://doi.org/10.47869/tcsj.74.4.8","url":null,"abstract":"The service quality and life of the runway, taxiway and apron pavement system heavily depends on the condition of its foundation, including base and/or subbase layers and subgrade. In the state of water-saturated condition, the strength of foundation would decline significantly, then inducing the downgrade of overall strength of the pavement. In the long term, the impacts from adverse environmental conditions and aircraft wheel loading will mix-up the materials of foundation layers, leading to the degradation of the original physical and mechanical properties of the original designed material. Furthermore, the accumulation of residual deformation and appearance of voids in the granular material can formulate the large holes beneath cement concrete slab. That, in turn, changes the load bearing model of the slab compared to the original design and causes the structural damage of the slab and threatens flight safety. Due to the complication of pavement foundation, the traditional treatment countermeasures usually need a long time for completion, while the airfield system often requires short and high-quality repair time. Therefore, there should be special solutions to satisfy the practical application. The article analyzes the cause, proposes the solutions for pavement foundation treatment and presents an initial application to Noi Bai International Airport. The findings of this study could be critical and significance basis for both academic and practical applications to maintain the service quality of airport construction infrastructure in Vietnam.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126210275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-task control of swarm robot with double integral model 基于二重积分模型的群机器人多任务控制

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.11

Nga Le Thi Thuy, Hai Nguyen Thanh, Tung Nguyen Van, Tich Pham Xuan

引用次数: 0

Strain orthogonal decomposition implemented within the phase field method with interfacial damage to model fracture in multi-phase heterogeneous materials 采用应变正交分解相场法对多相非均质材料的界面损伤模型断裂进行分析

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.1

Thanh Vu Ba, Lam Nguyen Xuan, Tu Do Anh

{"title":"Strain orthogonal decomposition implemented within the phase field method with interfacial damage to model fracture in multi-phase heterogeneous materials","authors":"Thanh Vu Ba, Lam Nguyen Xuan, Tu Do Anh","doi":"10.47869/tcsj.74.4.1","DOIUrl":"https://doi.org/10.47869/tcsj.74.4.1","url":null,"abstract":"In recent times, the phase field method is a robust simulation tool that can predict crack formation and propagation in structures. In brittle and quasi-brittle materials, the strain tensor is decomposed into negative and positive parts corresponding to the compression and tension behaviors when the structure is loaded. In the previous studies related to the phase field method, the strain tensor decompositions do not satisfy the orthogonal condition of these two parts, even if the elastic stiffness tensor is isotropic. This problem leads to inaccuracies in the mechanical behavior of the materials. In this paper, the strain tensor orthogonal condition is applied to the bulk strain tensor parts representing the internal strain of the component phases. This orthogonal condition is implemented into the phase field method with interfacial damage to simulate crack propagation in a sample containing multi-phase heterogeneous materials. Furthermore, the shape and area fraction of these phases are recognized by a supplemental sub-function which was studied in our recent paper from image formats. Through several examples, the obtained results are compared with the relevant numerical ones to demonstrate the correctness and effectiveness of the proposed method.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121654155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing structural health monitoring of bridge beams through spectral moment analysis 利用谱矩分析加强桥梁梁结构健康监测

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.2

Nguyen Thanh Quang, Nguyen Thuy Tien

引用次数: 0

Phase field modelling combined with optimization algorithm for maximizing the resistance in two-phase composites 相场建模与优化算法相结合实现两相复合材料电阻最大化

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.4

Thanh Vu Ba

{"title":"Phase field modelling combined with optimization algorithm for maximizing the resistance in two-phase composites","authors":"Thanh Vu Ba","doi":"10.47869/tcsj.74.4.4","DOIUrl":"https://doi.org/10.47869/tcsj.74.4.4","url":null,"abstract":"Recently, the phase field modelling is widely used to model and simulate material damage. In present work, we present a framework of the topology optimization combined with the phase-field modelling with/ without interfacial damage for optimizing the damage resistance of the inclusion-matrix composites. The first phase field method with the interfacial damage described by the phase field variable d(x) and an interfacial phase field variable β(x), thus the crack occurs in the interaction between the bulk fracture and the interfacial one; the second phase field method without the interfacial damage describes the crack by using only a damage variable d(x), thus the crack initiates at the points where stress concentration occurs (damage only occurring in the phases). Extended bi-directional evolutionary structural optimization algorithm (BESO) is used to optimize the inclusion distribution in order to reduce its volume while keeping the fracture resistance value of the initial design unchanged. Moreover, the strain tensor orthogonal decompositions are implemented into the phase field methods to improve the inaccuracy in the mechanical behavior of the materials. We compare the inclusion optimal distribution, the crack propagation and the fracture resistance between the proposed models through several numerical examples.","PeriodicalId":235443,"journal":{"name":"Transport and Communications Science Journal","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126363226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance evaluation of the artificial hummingbird algorithm in the problem of structural damage identification 人工蜂鸟算法在结构损伤识别问题中的性能评价

Transport and Communications Science Journal Pub Date : 2023-05-15 DOI: 10.47869/tcsj.74.4.3

Long Nguyen Ngoc, Quyet Nguyen Huu, Lan Nguyen Ngoc, Hieu Nguyen Tran

引用次数: 1