Journal of Science and Technology in Civil Engineering (STCE) - HUCE最新文献

Determination of influence lines for structural responses with uncertainties in properties of the structure 在结构特性不确定的情况下确定结构响应影响线

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-26 DOI: 10.31814/stce.huce2023-17(3)-01

Thanh Xuan Nguyen, A. Nguyen

{"title":"Determination of influence lines for structural responses with uncertainties in properties of the structure","authors":"Thanh Xuan Nguyen, A. Nguyen","doi":"10.31814/stce.huce2023-17(3)-01","DOIUrl":"https://doi.org/10.31814/stce.huce2023-17(3)-01","url":null,"abstract":"Classical ways of determination of influence lines for structural responses are often inefficient due to high computational cost, especially if properties of the structure are uncertain. The combination of Muller-Breslau principle and the finite element analysis can resolve this problem. In this study, formulations for new finite elements tailored for use in determination of influence lines for structural responses are proposed. They are then used in the problem of uncertainty propagation to obtain uncertain ordinates of the influence lines. The expressions for the element stiffness matrix and equivalent nodal load vector are derived consistently from the proposed displacement field of the element. The proposed finite elements can be adapted directly in existing finite element packages since they do not need remeshing. Studied examples show the correctness and the efficiency of the proposed method. From the results of uncertainty propagation problem, large uncertainties in the ordinates of influence lines for structural responses due to small uncertainties in structural properties should be aware of.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335883","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

Structural behavior of UHPC epoxy composite plate subjected to velocity impact loading UHPC 环氧复合板在承受速度冲击荷载时的结构行为

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-26 DOI: 10.31814/stce.huce2023-17(3)-05

Mai Viet Chinh, Nguyen Quang Nam, Nguyen Van Tu

引用次数: 0

Assessing the Social Costs of Mixed Transport Systems with a Dominance of Motorcycles 评估摩托车占主导地位的混合交通系统的社会成本

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-26 DOI: 10.31814/stce.huce2023-17(3)-07

Tam Vu, John Preston

{"title":"Assessing the Social Costs of Mixed Transport Systems with a Dominance of Motorcycles","authors":"Tam Vu, John Preston","doi":"10.31814/stce.huce2023-17(3)-07","DOIUrl":"https://doi.org/10.31814/stce.huce2023-17(3)-07","url":null,"abstract":"When undertaking strategic planning to identify potential options for a detailed assessment, it is important to compare the total costs of existing mixed transport systems with the introduction of different new public transport (PT) modes. Hence, this study develops a social cost model for situation of mixed transport system which has a dominance of motorcycles where a new PT technology (e.g. Bus Rapid Transit - BRT, Monorail or elevated Metro) or an exclusive bus lane is being considered. The innovative aspects of this research are to develop equations to estimate the average operating speed of each mode and to the allocation of infrastructure costs to several transport modes sharing the facilities in motorcycle dominated mixed traffic environments. Based on a four-lane per direction mixed traffic corridor in Hanoi, Vietnam, the results show the lowest average social cost (ASC) mixed transport systems for different ranges of demand. Moreover, all mixed traffic options with BRT, Monorail, elevated Metro or exclusive bus lanes are better than the existing situation in terms of ASC and it is suggested that their feasibility is examined in a detailed assessment. The mixed transport social cost model can be modified to suit other local conditions where conventional bus, car and motorcycle share facilities and a new PT mode is operated. Additionally, transport planners and decision makers in such local situations, which are particularly common in South East Asia, can draw on the findings of this study.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335726","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

Experimental study on the effectiveness of strengthening reinforced concrete slab-column connections using CFRP sheets 使用 CFRP 片材加固钢筋混凝土板柱连接有效性的实验研究

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-26 DOI: 10.31814/stce.huce2023-17(3)-04

Pham Xuan Dat, Nguyễn Trung Hiếu

{"title":"Experimental study on the effectiveness of strengthening reinforced concrete slab-column connections using CFRP sheets","authors":"Pham Xuan Dat, Nguyễn Trung Hiếu","doi":"10.31814/stce.huce2023-17(3)-04","DOIUrl":"https://doi.org/10.31814/stce.huce2023-17(3)-04","url":null,"abstract":"This paper presents an experimental study on the effect of externally bonded carbon fiber-reinforced polymer (CFRP) sheets on the punching shear behavior of interior slab-column connections. Two square slabs with a concentric column were fabricated, measuring 1200 ´ 1200 ´ 80 mm for the slabs and 200 ´ 200 mm for the column. One specimen served as an unstrengthened control specimen, while the other specimen was strengthened using CFRP sheets. The specimens were simply supported along their edges and subjected to punching tests, with the vertical load applied through the central column. The experimental results revealed that the application of CFRP sheets significantly improved the performance of the slab-column connections. The strengthened slab exhibited a 16.3% increase in punching capacity compared to the control specimen. Additionally, a calculation was conducted to determine the punching shear strength of the test specimens, taking into account the interaction between shear and flexural capacities in a two-way flat slab. This calculation provided a deeper understanding of the impact of CFRP sheet strengthening on the enhancement of the strength of the slab-column connections.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"90 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139335844","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

Corrosion effect on stress concentration factor in tubular T-joints under axial loading 腐蚀对轴向加载下管状 T 型接头应力集中系数的影响

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-25 DOI: 10.31814/stce.huce2023-17(3)-12

Vu Dan Chinh, Do Thanh Long

引用次数: 0

An analytical approach to predict post-cracking behavior of steel fiber reinforced concrete considering the fibers orientation 考虑纤维取向的钢纤维加固混凝土开裂后行为预测分析方法

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-25 DOI: 10.31814/stce.huce2023-17(3)-09

Vu Chi Cong, Vu Duc Tam

引用次数: 0

Dynamic finite element modeling of axially functionally graded Timoshenko microbeams under a moving mass 移动质量下轴向功能分级季莫申科微梁的动态有限元建模

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-25 DOI: 10.31814/stce.huce2023-17(3)-10

Vu Thi An Ninh, Nguyen Thi Kim Khue

引用次数: 0

The Upper bound limit analysis of slope in cohesive-frictional soils using the node-based smoothed finite element method 使用基于节点的平滑有限元法对粘性摩擦土中的边坡进行上限极限分析

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-25 DOI: 10.31814/stce.huce2023-17(3)-11

T. Vo-Minh

引用次数: 0

Investigating compressive strength of concrete containing steel fiber by data-driven approach 用数据驱动法研究含钢纤维混凝土的抗压强度

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-25 DOI: 10.31814/stce.huce2023-17(3)-06

Trần Văn Quân, Nguyen Ngoc Linh, Nguyen Ngoc Tan

{"title":"Investigating compressive strength of concrete containing steel fiber by data-driven approach","authors":"Trần Văn Quân, Nguyen Ngoc Linh, Nguyen Ngoc Tan","doi":"10.31814/stce.huce2023-17(3)-06","DOIUrl":"https://doi.org/10.31814/stce.huce2023-17(3)-06","url":null,"abstract":"The main objective of this paper is to use the data-driven approach to predict and study the factors affecting the compressive strength of steel fiber concrete. Therefore, six machine learning (ML) models were evaluated against a database of 166 samples and ten input variables, including Cement content, Water content, Silica fume content, Steel fiber content, Coarse aggregate content, Sand content, Superplasticizer content, Fiber diameter, Fiber length, Fly ash content. SixMLmodels, including Artificial Neural Network (ANN), K-Nearest Neighbor (KNN), Categorical Boosting (CatB), Random Forest (RF), Gradient Boosting (GB), and Extreme Gradient Boosting (XGB), are evaluated against performance metrics and validated by 1000 Monte Carlo simulations. The compressive strength prediction performance by the ML models is arranged in descending order as follows XGB>GB>CatB>RF >ANN>KNN. The two best models can predict the compressive strength of steel fiber concrete to be GB with a coefficient of determination (R2) of 0.9874 and a root mean square error (RMSE) of 2.5763 MPa and XGB with an R2 of 0.9926 and an RMSE of 1.9814 MPa for the testing dataset. The influence of the ten variables can be arranged in descending order as follows: Cement content > Water content > Silica fume content > Steel fiber content >Coarse aggregate content > Sand content > Superplasticizer content > Fiber diameter > Fiber length > Fly ash content. Among them, Cement content, Silica fume content, and Steel fiber content have a positive effect on improving the compressive strength of concrete. The steel fiber content used should be less than 1.5% of concrete volume to improve the efficiency of steel fiber in concrete. Meanwhile, Fiber diameter and Fiber length have a minimal influence on the compressive strength of steel fiber concrete.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139336365","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

An innovative model to estimate the tension field inclination considering crack growth for steel plate shear wall 考虑到钢板剪力墙裂缝增长的拉力场倾斜度估算创新模型

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2023-09-25 DOI: 10.31814/stce.huce2023-17(3)-08

Chung Van Nguyen, A. Ghamari

{"title":"An innovative model to estimate the tension field inclination considering crack growth for steel plate shear wall","authors":"Chung Van Nguyen, A. Ghamari","doi":"10.31814/stce.huce2023-17(3)-08","DOIUrl":"https://doi.org/10.31814/stce.huce2023-17(3)-08","url":null,"abstract":"The Steel Plate Shear Walls (SPSWs) are known as a capable system to use in steel structures due to their significant advantages. Despite extensive studies concerning this system, few researchers have scrutinized thecrack effect on SPSW behavior. However, the crack dramatically affected the experimental results. In the currentpaper, the effect of central and edge cracks, therefore, has been studied in jointed plates at mid-height of SPSW.Results indicated that the central crack is more destructive than the edge crack. The central crack having a long initial length also makes a sudden wall fracture in the elastic zone and consequently cannot be used in high seismic regions. Due to the dependence of the wall on the diagonal tension field and its angle, an equationis proposed taking into account shear, axial, and moment actions in columns, axial and moment actions in beams, as well as shear and axial actions in the plate which conform to finite element results. Because of thecomplication of the stress intensity factor for mode I and mode II calculations, this confidence is derived and offered.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"41 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139336240","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