Stavební obzor - Civil Engineering Journal最新文献_第5页

BEARING CAPACITY OF T BEAM UNDER DIFFERENT PRESTRESS LEVELS: FULL-SCALE EXPERIMENT AND FEM ANALYSIS 不同预应力水平下t梁承载力的全尺寸试验与有限元分析

Stavební obzor - Civil Engineering Journal Pub Date : 2022-10-30 DOI: 10.14311/cej.2022.03.0036

Long Liu, Jinyan Ma

{"title":"BEARING CAPACITY OF T BEAM UNDER DIFFERENT PRESTRESS LEVELS: FULL-SCALE EXPERIMENT AND FEM ANALYSIS","authors":"Long Liu, Jinyan Ma","doi":"10.14311/cej.2022.03.0036","DOIUrl":"https://doi.org/10.14311/cej.2022.03.0036","url":null,"abstract":"Insufficient prestress will cause cracks in the T beam, which will influence its stiffness and bearing capacity. This paper is devoted to studying the influence of prestress levels on the bearing capacity of T beam, and then judging its working state. A full-scale model experiment is carried out on the 13 meters prestressed concrete T beam. At the same time, a nonlinear finite element model is established and verified. The experimental results show the numerical simulation results are in good agreement with the experimental results. Finally, the finite element model is used to make a simulation of the bearing capacity of T beams under different prestress levels. The mathematical relationship between prestress levels and bearing capacity is obtained based on the results of the finite element model. The relationships between the mid-span deflection and load of the experimental beam are basically the same under different prestress levels, both including three stages: elastic stage, crack development stage and failure stage. With the increase of the prestress levels, the stiffness of the experimental beam before cracking is improved significantly.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88490637","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

APPLYING BIOGEOGRAPHY-BASED MULTI-LAYER PERCEPTRON NEURAL NETWORK TO PREDICT CALIFORNIA BEARING CAPACITY VALUE OF STABILIZED POND ASH WITH LIME AND LIME SLUDGE 应用基于生物地理学的多层感知器神经网络预测石灰和石灰污泥稳定池灰的加州承载力值

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0026

Jundong Wu, Jiaman Li, Wei Hu

引用次数: 0

USE OF CALCINATION RESIDUE FROM RICE HUSK AS A SUBSTITUTE FOR CEMENT 稻壳煅烧渣作为水泥替代品的应用

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0024

Lyamine Briki, Loucif Ali Bouacida, N. Lahbari

引用次数: 0

VALUING THE URBAN SPACE ACCORDING TO THE REHABILITATION OF GREEN SPACES 根据绿地的恢复来评估城市空间

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0021

Djeloul Tahri

引用次数: 1

THERMAL PERFORMANCE ASSESSMENT OF WALL ASSEMBLIES: CRITERIA IMPORTANCE THEORY AND AHP APPROACH 墙体组合件热性能评价:标准重要性理论和ahp方法

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0018

Y. Biks, O. Ratushnyak, A. Lyalyuk, G. Ratushnyak

{"title":"THERMAL PERFORMANCE ASSESSMENT OF WALL ASSEMBLIES: CRITERIA IMPORTANCE THEORY AND AHP APPROACH","authors":"Y. Biks, O. Ratushnyak, A. Lyalyuk, G. Ratushnyak","doi":"10.14311/cej.2022.02.0018","DOIUrl":"https://doi.org/10.14311/cej.2022.02.0018","url":null,"abstract":"The problem of the “best” choice in terms of the ecological, durable, cheap and energy-effective material of envelope construction has been considered in the paper. For the numerical assessment of the thermal performance, the MCDA techniques as Analytical Hierarchy Process (AHP) and Criteria Importance Theory (CIT) were used. There were proposed eight types of wall assemblies from a natural material, namely: Hempcrete, Adobe, Strawbale panel, Earthbag, Cordwood, SIP (plywood+ecofiber), Hempcrete+straw and Compositional building thermo-block. As a objective function for the search of the best alternative the integral index was proposed which consist of thermo-physical and economic criteria. As the thermo-physical criteria component of the index were taken the u-value of the envelope W/m2K, the dimensionless decrement factor of the envelope f and the internal areal heat capacity of the envelope k1, kJ/m2K according to ISO 13786:2017. As economic criteria of the integral index, the authors proposed the cost of the wall material Q, UAH/m2 and the mass of the wall m, kg/m2. The analysis of the conducted research has shown, that from the one hand there is no absolute “leader” in the ranking of the wall assemblies according to the proposed criteria and MCDA technique, but from the other hand by comparison of the results, there were revealed that the top three alternatives in both AHP and CIT technique are walls of “B”, “D” and “E” type with different point order, achieved in each MCDA calculation technique.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86291270","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

EQUIVALENT THICKNESS COEFFICIENT OF COLD CENTRAL PLANT RECYCLING PAVEMENT STRUCTURE 冷中心厂房回收路面结构等效厚度系数

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0019

Yanhai Yang, Liang Yue, H. Zhang, Yeol-Ho Yang

{"title":"EQUIVALENT THICKNESS COEFFICIENT OF COLD CENTRAL PLANT RECYCLING PAVEMENT STRUCTURE","authors":"Yanhai Yang, Liang Yue, H. Zhang, Yeol-Ho Yang","doi":"10.14311/cej.2022.02.0019","DOIUrl":"https://doi.org/10.14311/cej.2022.02.0019","url":null,"abstract":" This research focuses on the equivalent relationship between cold central plant recycling mixture and hot mix asphalt. In this paper, the pavement surface condition index (PCI) was calculated by the road surface conditions investigating, which was used as the evaluation standard. The unreasonable data were removed by SPSS software. The existing decay equation of pavement performance was simplified by MATLAB, and optimized by the Marquardt and global optimization methods. The survey data were fitted nonlinearly by 1stOpt software. Ultimately, the multivariate nonlinear regression optimization equation of the equivalent thickness coefficient was established. The results show that the cold central plant recycling with the emulsified asphalt (CREA) pavement equivalent thickness coefficient is 0.587. The cold central plant recycling with the foamed asphalt (CRFA) pavement equivalent thickness coefficient is 0.632. In addition, the performance of 10 cm cold central plant recycling pavement is equivalent to 6 cm the traditional hot mix asphalt pavement. The dispersion of the CREA is greater than that of the CRFA significantly.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"25 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91512779","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: 2

FORMATION AND FAILURE BEHAVIOR OF OPEN-GRADED FRICTION COURSE AT LOW TEMPERATURES 低温下开级摩擦层的形成与破坏行为

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0020

Baoyang Yu, Zongguang Sun, Lin Qi

引用次数: 1

NUMERICAL ANALYSIS OF BFRP REINFORCED CONCRETE SLAB EXPOSED TO IMPACT LOADS 冲击荷载作用下BFRP钢筋混凝土板的数值分析

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0027

D. Jindra, P. Hradil

引用次数: 0

INTERNAL AND EXTERNAL IMAGE OF HRADČANY AND PRAGUE CASTLE hradČany和布拉格城堡的内外形象

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0028

Martin Šnorbert

{"title":"INTERNAL AND EXTERNAL IMAGE OF HRADČANY AND PRAGUE CASTLE","authors":"Martin Šnorbert","doi":"10.14311/cej.2022.02.0028","DOIUrl":"https://doi.org/10.14311/cej.2022.02.0028","url":null,"abstract":"This contribution deals with the urban development of the Hradčany area, within its position in the capital city, but especially within the area itself. Great emphasis is placed on historical development, as it significantly affects the current situation. Prague Castle, perceived as a historical and architectural complex, is unique in its complexity and size, we will not find a similar example in any of the surrounding countries. \u0000Prague Castle, as an important part of Hradčany, was and still is the seat of the monarch, or today the president of the Czech Republic. The development of Czech history influenced the appearance of the Castle (alternation of royal families, growth and decline in the importance of Prague, ie the Czech kingdom in Central Europe). The combination of secular and ecclesiastical power in one place is also remarkable. At the same time, it is possible to find evidence of development in the field of culture, technical conveniences, architectural and engineering arts, over the course of ten centuries. \u0000Based on archival research and the study of references, the reader is acquainted with the gradual change in the formation of the current plan of the city and the Castle. The connection between morphological assumptions and the location of first a Slavic fort, later a stone castle, is pointed out. The castle area was followed by a settlement in the sub-castle, which in the 14th century became a serf town of Hradčany. The alternation of artistic styles over the centuries and the related change in the structure and scale of buildings, but especially the panorama of Hradčany with the silhouette of the Castle, is discussed. In the end, the potential of the Hradčany area and the possibility of modernization interventions are also evaluated.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"205 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88583257","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

FEATURES OF THE MORPHOLOGY OF THE SHEAR FAILURE SURFACES OF COARSE-GRAINED SLIP ZONE SOILS 粗粒滑带土剪切破坏面形态特征

Stavební obzor - Civil Engineering Journal Pub Date : 2022-07-31 DOI: 10.14311/cej.2022.02.0023

Zechuang Li, Qiyuan Cai, Diankun Liu

{"title":"FEATURES OF THE MORPHOLOGY OF THE SHEAR FAILURE SURFACES OF COARSE-GRAINED SLIP ZONE SOILS","authors":"Zechuang Li, Qiyuan Cai, Diankun Liu","doi":"10.14311/cej.2022.02.0023","DOIUrl":"https://doi.org/10.14311/cej.2022.02.0023","url":null,"abstract":"Analyzing the change in the roughness of the shear plane under different particle composition is important to reveal the mesoscopic mechanism of strength change of coarse-grained slip zone soil. Slip zone soils were grouped according to different particle gradations and coarse particle contents for experiments. To collect shear plane coordinate data points, the customized shear plane measurement die was examined in the early stage to measure the shear plane. Then, the measured 3D data points are drawn into a 3D surface map by using the Surfer drawing software to show the actual situation of the shear plane. The shear planes were analyzed from different angles by using box plots and ice crystal flower plots. Finally, the roughness of the shear plane was quantified by the root mean square of the relative undulation (Z2). Findings indicate that the shear plane undulation characteristics of coarse-grained slip zone soil are obviously correlated with the proportion of particles with a size between 5–20 mm. Moreover, whether the gradation is good or poor has a significant effect on the shear plane characteristics. The well-graded shear plane is coarser and more undulated, whereas the poorly graded shear plane is the opposite. As the normal force increases, the undulation and roughness of the shear plane decrease. As the content of coarse particles increases, the roughness of the shear plane increases, and Z2 has a highly positive linear correlation with the coarse particle content.","PeriodicalId":21974,"journal":{"name":"Stavební obzor - Civil Engineering Journal","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87845698","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