Periodica Polytechnica-Civil Engineering最新文献_第8页

Numerical Simulation of a Planar Model of a Ball Absorber in a Spherical Dish 球盘内球吸收体平面模型的数值模拟

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-05-08 DOI: 10.3311/ppci.21725

Marek Kawulok, S. Pospíšil, N. Freiherrová, D. Juračka

引用次数: 0

Utilization of Recyclable Concrete and Ceramic Waste as Filling Material in Hot Mix Asphalt 可回收混凝土和陶瓷废料在热拌沥青中的应用

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-05-03 DOI: 10.3311/ppci.21352

S. Serin, Y. Önal, C. Kayadelen, N. Morova

引用次数: 0

Investigation on the Behavior of Bridge Piers Considering Rocking Isolation Constructed on Non-plastic Silts and Sands Using 1g Shaking Table Tests 用1g振动台试验研究非塑性泥沙上考虑隔震的桥墩性能

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-26 DOI: 10.3311/ppci.21713

Arash Esmatkhah Irani, Masoud Hajialilue Bonab, Fariba Behrooz Sarand, H. Katebi

{"title":"Investigation on the Behavior of Bridge Piers Considering Rocking Isolation Constructed on Non-plastic Silts and Sands Using 1g Shaking Table Tests","authors":"Arash Esmatkhah Irani, Masoud Hajialilue Bonab, Fariba Behrooz Sarand, H. Katebi","doi":"10.3311/ppci.21713","DOIUrl":"https://doi.org/10.3311/ppci.21713","url":null,"abstract":"Occurred damages on the bridge piers during earthquakes lead to significant financial losses worldwide every year and can cause social problems by disrupting traffic flow and transportation services. Rocking isolation of foundations is one of the damage reduction approaches to avoid structural damage on piers by transferring plastic hinges from piers to underlying soil media. The behavior of rocking foundations on non-plastic silts has not been investigated well until now in the literature. In this research, the characteristic seismic behavior of a bridge pier considering rocking isolation is evaluated using small-scale physical modeling tests. To this aim, eight shaking table tests (with sinusoidal excitations) are conducted where both sandy and silty materials are employed as the soil media. In addition to the effects of the underlying soil, the effects of the critical contact area ratio of the foundation and frequency of input motions are evaluated. Achieved results indicate that the considered bridge pier shows the same behavior trend for underlying silty soil and sandy one. However, because of the frequency-dependent behavior of non-plastic silty soil, the pier attracts lower accelerations and higher moments. Therefore, the achieved results show that the proposed design approaches of rocking foundations that are mostly extracted based on experimental studies on sands (or rarely on clay) can lead to non-conservative designs in silty soils.","PeriodicalId":49705,"journal":{"name":"Periodica Polytechnica-Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87982306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Dust Removal Technology of Explosive Water Mist in Drill and Blast Tunnelling 钻爆隧道爆炸水雾除尘技术研究

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-24 DOI: 10.3311/ppci.21678

Jianjun Shi, H. Zhao, Wen-ke Xu, W. Zhang, H. An

引用次数: 2

Optimizing of Discrete Time-cost Trade-off Problem in Construction Projects Using Advanced Jaya Algorithm 基于先进Jaya算法的建筑项目离散时间成本权衡优化

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-18 DOI: 10.3311/ppci.22156

Gülçağ Albayrak

{"title":"Optimizing of Discrete Time-cost Trade-off Problem in Construction Projects Using Advanced Jaya Algorithm","authors":"Gülçağ Albayrak","doi":"10.3311/ppci.22156","DOIUrl":"https://doi.org/10.3311/ppci.22156","url":null,"abstract":"This paper proposes a novel algorithm to optimize the discrete time-cost trade-off problem (DTCTP) in construction projects. As DTCTP is assumed NP-hard, the new metaheuristic models are investigated to contribute for decision-making of project managers. DTCTP can be modelled as multi-mode to represent real-life problems more practical. According to the model, the project activities have at least two or more durations and cost alternative modes. For solving this problem effectively, a novel optimization metaheuristic method named Advanced Jaya Algorithm (A-JA) is proposed, which is generated from Jaya Algorithm (JA). The benchmark function tests are applied to verify the model with other well-known metaheuristic methods. The key weakness of the base algorithm JA is that, it has unstable solution accuracy and low likelihood of escaping local optimums. According to the results, A-JA considerably improves these areas. Two case studies of DTCTP are carried out after verification to demonstrate the effectiveness and efficiency of the proposed algorithm in comparison with JA and three well-known methods. The results of A-JA are found to be more powerful than the base algorithm JA and the benchmark algorithms. The proposed method achieves the Pareto fronts to help decision makers to make trade-off between the objectives and choose the optimum solution considering on their preference.","PeriodicalId":49705,"journal":{"name":"Periodica Polytechnica-Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80150246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanical and Durability Properties of Sustainable Self-compacting Concrete with Waste Glass Powder and Silica Fume 废玻璃粉和硅粉可持续自密实混凝土的力学性能和耐久性

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-17 DOI: 10.3311/ppci.21537

Mahdi Jalalinejad, A. Hemmati, A. Mortezaei

引用次数: 1

A New Stress-reduction Model for Soil Arch in Landslides 一种新的滑坡土拱应力减小模型

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-17 DOI: 10.3311/ppci.22054

Xing-ming Li, E. Yan, Miao Sun, Xiangqian Yao, Shuo Li, Cheng Gao, Qian Chen

{"title":"A New Stress-reduction Model for Soil Arch in Landslides","authors":"Xing-ming Li, E. Yan, Miao Sun, Xiangqian Yao, Shuo Li, Cheng Gao, Qian Chen","doi":"10.3311/ppci.22054","DOIUrl":"https://doi.org/10.3311/ppci.22054","url":null,"abstract":"Stabilizing piles are extensively used as an effective landslide control treatment, and the soil arching effect is the key element for the performance of the pile system. Most previous studies on soil arching effect and its application in stabilizing piles were conducted with laboratory tests and numerical simulations, while limited efforts have been dedicated to the analytical characterization of such a soil-structure interaction. In this paper, a new stress-reduction model for soil arch in landslides is established by theoretical derivation. Our model calculation has demonstrated an exponential reduction in the stress along the direction of slipping between and behind stabilizing piles and thus justifies the observations of laboratory tests and numerical simulations. Thereafter, the analytical solutions to the two key arch shape parameters, namely the inclination angle at the foothold and the thickness of soil arch, are derived based on the proposed stress-reduction model. Then, the ultimate bearing capacity of soil arch between and behind stabilizing piles is subsequently calculated, and a three-level load sharing model for landslides is thus proposed based on the stress-reduction mode. The load sharing model can well capture the stage characteristics of the interaction between landslide mass and stabilizing piles. Finally, the calculation model of spacing between stabilizing piles is established based on the proposed stress-reduction model, and it turns to be good in field application. The findings of this study can contribute to a better understanding of the soil arching effect as well as a better design of the stabilizing piles.","PeriodicalId":49705,"journal":{"name":"Periodica Polytechnica-Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74943885","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Investigation of the Recent Developments in Reliability-based Structural Topology Optimization 基于可靠性的结构拓扑优化研究进展

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-12 DOI: 10.3311/ppci.22107

M. Habashneh, M. Movahedi Rad

引用次数: 0

Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles 干湿循环作用下砂岩抗拉强度劣化效应及其细观机制

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-12 DOI: 10.3311/ppci.22007

Jianfei Yang, Guodong Zhang, Lixu Deng, Yaxin Zhang, Zheng Li, Y. Ye

{"title":"Deterioration Effect of Sandstone Tensile Strength and Its Mesoscopic Mechanism under Dry-wet Cycles","authors":"Jianfei Yang, Guodong Zhang, Lixu Deng, Yaxin Zhang, Zheng Li, Y. Ye","doi":"10.3311/ppci.22007","DOIUrl":"https://doi.org/10.3311/ppci.22007","url":null,"abstract":"The rock mass in the hydro-fluctuating zone of the reservoir bank slope is under dry-wet cycles for a long time, which will cause the deterioration of rock mass and induce geological disasters. In this study, a series of dry-wet cycle tests on the argillaceous quartz sandstone in the Three Gorges Reservoir area was carried out. Then, after different dry-wet cycles, the sandstone specimens were used to conduct the Brazilian splitting, scanning electron microscope, and 3D laser scanning tests. Herein, we provided detailed physical and microscopy image data to analyze the deterioration effect of tensile strength and mesostructure deterioration process of sandstone. With the increase of dry-wet cycles, the tensile strength of sandstone initially decreases rapidly, and then the decline rate tends to slow down. The evolution laws of fractal dimension and porosity are also significantly consistent with the deterioration of tensile strength. Moreover, further mesostructural analysis has revealed the repeated “absorption and swelling-dehydration and contraction” of clay minerals. This results in the breakage of framework mineral quartz and the expansion and connectivity of internal cracks, which ultimately deteriorates sandstone’s tensile strength.","PeriodicalId":49705,"journal":{"name":"Periodica Polytechnica-Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73503384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Activator Type on Geopolymer Mortars Containing Different Types of Fly Ash 活化剂类型对不同粉煤灰掺量地聚合物砂浆的影响

IF 1.8 4区工程技术

Periodica Polytechnica-Civil Engineering Pub Date : 2023-04-12 DOI: 10.3311/ppci.21945

{"title":"Effect of Activator Type on Geopolymer Mortars Containing Different Types of Fly Ash","authors":"","doi":"10.3311/ppci.21945","DOIUrl":"https://doi.org/10.3311/ppci.21945","url":null,"abstract":"In this study, the influence of the activator type on the physical and mechanical properties of the geopolymer mortars was analyzed. C and F-class fly ash (FA), blast furnace slag (BFS), sodium hydroxide (NH), sodium metasilicate (NS), standard sand, and distilled water were used in the production of mortar specimens. All specimens were cured at room temperature. C and F-class fly ash usage ratios are 0%, 15%, and 30%. NH was used as an activator in the 1st group of the produced geopolymer mortars, and NS with NH was used in the 2nd group. 5 series were produced and a flow-table test, ultrasonic pulse velocity test, flexural strength test, compressive strength test, and Scanning Electron Microscope-Energy Dispersive Spectrometry (SEM-EDS) microstructure analysis were applied to the samples. The addition of NS increased the compressive strength and the greatest increase occurred in the reference sample by 113%. It also increased the compressive strength of FAF30 by 60% in comparison to FAC30. Following the results of the SEM examination, when the reference samples were compared, the addition of NS inhibited the formation of cracks. According to the SEM-EDS analysis results, an increase in the F and C-class FA ratio improved the crack formation. Compared to F-class FA, FAC30 has more cracks due to the lower SiO2 content in C-class FA. High K content and SiO2 ratio, as determined by EDS analysis, boost the alkalinity and positively impact the strength.","PeriodicalId":49705,"journal":{"name":"Periodica Polytechnica-Civil Engineering","volume":null,"pages":null},"PeriodicalIF":1.8,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75126548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0