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Microstructure deterioration of sandstone under freeze-thaw cycles using CT technology:The effects of different water immersion conditions

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Journal of Rock Mechanics and Geotechnical engineering 2025年第3期17卷 1599-1611页

作者： Bei Qiu Lifeng Fan Xiuli Du Faculty of Architecture Civil and Transportation EngineeringBeijing University of TechnologyBeijing100124China

In cold regions,rock structures will be weakened by freeze-thaw cycles under various water immersion *** how water immersion conditions impact rock deterioration under freeze-thaw cycles is critical to assess accurately the frost resistance of engineered *** this paper,freeze-thaw cycles(temperature range of-20℃-20℃)were performed on the sandstones in different water immersion conditions(fully,partially and non-immersed in water).Then,computed tomography(CT)tests were conducted on the sandstones when the freeze-thaw number reached 0,5,10,15,20 and ***,the effects of water immersion conditions on the microstructure deterioration of sandstone under freezethaw cycles were evaluated using CT spatial imaging,porosity and damage ***,focusing on the partially immersed condition,the immersion volume rate was defined to understand the effects of immersion degree on the freeze-thaw damage of sandstone and to propose a damage model considering the freeze-thaw number and immersion *** results show that with increasing freeze-thaw number,the porosities and damage factors under fully and partially immersed conditions increase continuously,while those under non-immersed condition first increase and then remain approximately *** most severe freeze-thaw damage occurs in fully immersed condition,followed by partially immersed condition and finally non-immersed ***,the freeze-thaw number and the immersion volume rate both impact the microstructure deterioration of the partially immersed *** the same freeze-thaw number,the damage factor increases approximately linearly with increasing immersion volume rate,and the increasing immersion degree exacerbates the microstructure deterioration of ***,the proposed model can effectively estimate the freeze-thaw damage of partially immersed sandstone with different immersion volume rates.

关键词： Freeze-thaw cycles Water immersion condition Computed tomography(CT) Microstructure deterioration Sandstone

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Green intelligent building design based on integrated photovoltaic/thermal building

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International Journal of Renewable Energy Development 2025年第3期14卷 485-494页

作者： Wang, Tianchi Faculty of Architecture and Civil Engineering Huaiyin Institute of Technology Huai'an223001 China

With the increasingly prominent contradiction between energy consumption and environmental governance, the integrated photovoltaic/thermal building system has broad development prospects in building energy conservation. However, the improper placement of photovoltaic solar thermal collectors results in the inability of solar energy systems to maximize energy conversion. In order to combine photoelectric photothermal technology with architectural design, realize the efficient conversion and utilization of solar energy, reduce the dependence on traditional energy sources, and reduce building energy consumption, research based on the comprehensive utilization technology of solar photovoltaic photothermal building, designed an integrated photovoltaic photothermal building system, and optimized the system for different light resources and environmental conditions of solar photovoltaic photothermal collectors. The system achieved zero energy operation when the total energy consumption in winter was 798.92kW·h. The cumulative power supply and heat generation of the integrated photovoltaic/thermal building system throughout the winter were 214.63kW·h and 79.68kW·h. This study uses solar photovoltaic solar thermal collectors to replace roof coverings or insulation layers, which declines the impact of solar energy on buildings, and avoids duplicate investment and cuts cost. This study can improve power generation efficiency, meet heating needs, enhance resource utilization efficiency, reduce environmental pollution, and promote the sustainable development of the construction industry. © The author(s).

关键词： Architectural design

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IMPACT OF VISIBILITY ON TRAFFIC INCIDENTS AT SIGNALIZED INTERSECTIONS – A CASE STUDY IN POLISH CITIES

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Archives of Transport 2025年第1期73卷 53-78页

作者： Iwanowicz, Damian Klusek, Radoslaw Department of Road and Transportation Engineering and Geotechnic Faculty of Civil and Environmental Engineering and Architecture Bydgoszcz University of Science and Technology Bydgoszcz Poland

In urban agglomerations, signalized intersections are common. However, in traffic management, safety-focused strategies are often sacrificed for traffic efficiency by allowing simultaneous multiple conflicting movements. We identified this issue by analyzing the most dangerous signalized intersections in several Polish cities. Our research evaluated whether obstructed sight distances between major and minor traffic streams could be a significant problem at these intersections. To achieve this, we employed existing models of visibility analysis related to stopping sight distance. We determined the key parameter for stopping sight distance based on our vehicle speed studies. Tests were conducted using unmanned aerial vehicles over the intersections in the cities under consideration. Subsequently, we adapted available sight distance models to characterize conflicting streams with simultaneous green signals in a signal phase. We distinguished between major movements, including tram, pedestrian, and cyclist traffic, and minor streams, primarily involving turning vehicle movements at the intersection. Through this approach, we analyzed stopping sight distance and found that in about 60% of the cases studied, the obstructed sight distances led to a higher number of traffic incidents in the areas of conflict between major and minor traffic streams. The overall number of traffic incidents was more than 57% higher in areas with obstructed sight distance conditions, with the worst statistics involving incidents with vulnerable road users. This straightforward approach confirmed the findings of many studies that sight distance is one of the most critical factors influencing traffic safety. Based on our research findings, we recommend implementing safe traffic management strategies at intersections with obstructed sight distances, specifically multiphase signalization. Additionally, due to the often-necessary compromise in phases involving pedestrian and cyclist traffic, we reco

关键词： Bicycles

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Identifying urban, transportation, and socioeconomic characteristics across US zip codes affecting CO2 emissions: A decision tree analysis

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Energy and Built Environment 2025年第3期6卷 484-494页

作者： Zagow, Maged Elbany, Marwa Darwish, Ahmed Mahmoud at Faculty of Engineering Tanta University Egypt at Faculty of Architecture Galala University Egypt of Transportation and Traffic Engineering Civil Engineering Department Faculty of Engineering Port Said University Egypt Transportation Engineering Department Faculty of Engineering Alexandria University Alexandria Egypt

Understanding the factors contributing to CO2 emissions is pivotal for informed policy-making and sustainable urban development. This study probes the interconnections between urban attributes, transportation patterns, and socioeconomic factors concerning CO2 emissions using Decision Tree analysis across a substantial dataset of US zip codes. The dataset was carefully prepared to ensure accuracy and relevance, considering temporal, geographical, and socioeconomic heterogeneity. The Decision Tree algorithm was applied iteratively to evaluate variable interactions and identify critical thresholds that influence carbon emissions. The findings of this study shed light on the key drivers of CO2 emissions across US zip codes. The analysis reveals significant variations in the relative importance of different factors in different regions, emphasizing the need for localized and tailored strategies to address carbon reduction targets effectively. The research provides a more holistic understanding that can drive effective urban planning and energy policies, ultimately contributing to the global effort to reduce carbon emissions and combat climate change. The findings from this research underscore the importance of multidisciplinary approaches in addressing environmental challenges and highlight the necessity for continuous innovation in analytical methodologies to keep pace with the evolving urban landscapes. © 2024

关键词： Decision trees

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Identification of spatial and temporal variability of seasonality in precipitation regimes over Serbia

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Environmental Earth Sciences 2025年第6期84卷 1-18页

作者： Arab Amiri, Mohammad Gocić, Milan Tehran Iran Faculty of Civil Engineering and Architecture University of Nis Aleksandra Medvedeva 14 Nis18000 Serbia

This study examines the spatial and temporal variability of precipitation seasonality across Serbia using various seasonality indices. The research focuses on understanding the intra- and inter-annual variability of precipitation regimes over two sub-periods: 1946–1984 and 1985–2023. For this purpose, monthly precipitation data from 24 synoptic stations across Serbia were analyzed using seasonality indices such as the General Seasonality Index (SI¯), Individual Seasonality Index (SIi), Mean Individual Seasonality Index (SIi¯), and Replicability Index (RI)). The results shown on the SI maps indicate a more irregular rainfall distribution during the first sub-period, with a noticeably higher seasonality in the northern part of Serbia. The mean SIi shows an increasing gradient from southwest to northeast, with the highest variability shifting from the central and southeastern parts (1946–1984) to the northern and eastern parts of Serbia (1985–2023). Minimum values reveal a shift from a "very equitable" regime in the first sub-period to "equitable with a definite wetter season" in the second, while maximum values generally decreased. RI values remain low across Serbia, reflecting significant variability in precipitation regimes. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Miocene

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Stochastic response of steel columns subjected to lateral blast based on modified single degree of freedom (MSDOF) method

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Resilient Cities and Structures 2025年第1期4卷 1-15页

作者： Momeni, Mohammad Bedon, Chiara Hadianfard, Mohammad Ali Malekpour, Sina Department of Civil Engineering Faculty of Engineering Fasa University Fasa Iran Department of Engineering and Architecture University of Trieste Trieste Italy Department of Civil and Environmental Engineering Shiraz University of Technology Shiraz Iran

This paper aims to evaluate the stochastic response of steel columns subjected to blast loads using the modified single degree of freedom (MSDOF) method, which assessed towards the conventional single degree of freedom (SDOF) and the experimentally validated Finite Element (FE) methods (LSDYNA). For this purpose, special attention is given to calculating the response of H-shaped steel columns under blast. The damage amount is determined based on the support rotation criterion, which is expressed as a function of their maximum lateral mid-span displacement. To account for uncertainties in input parameters and obtain the failure probability, the Monte Carlo simulation (MCS) method is employed, complemented by the Latin Hypercube Sampling (LHS) method to reduce the number of simulations. A parametric analysis is hence performed to examine the effect of several input parameters (including both deterministic and probabilistic parameters) on the probability of column damage as a function of support rotation. First, the MSDOF method confirms its higher accuracy in estimating the probability of column damage due to blast, compared to the conventional SDOF. The collected results also show that uncertainties of several input parameters have significant effects on the column behavior. In particular, geometric parameters (including cross-sectional characteristics, boundary conditions and column length) have major effect on the corresponding column response, in the same way of input blast load parameters and material properties. © 2024 The Author(s)

关键词： Monte Carlo methods

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The Durability of some Outdoor Pavement Products Against the Triple-Combined Effects: Freeze-Thaw, De-Icing Salt and Abrasion

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Iranian Journal of Science and Technology - Transactions of civil engineering 2025年 1-15页

作者： Kotan, Türkay Ardahanlı, Metehan Civil Engineering Department Faculty of Engineering and Architecture Erzurum Technical University Erzurum Türkiye

The various pavement products used outdoors may be exposed to the triple-combined effects of abrasion, freezing and thawing, and de-icing salt under real-life conditions. In this study, it was aimed to investigate some physical and mechanical properties and resistance to triple-combined effect (abrasion, freeze-thaw and de-icing salt) of Andesite Stone Pavement (ASP), Diorite Stone Pavement (DSP), Concrete Block Pavement (CBP) and Concrete Block Tactile Pavement (CBTP) pavement products used as exterior coating materials for various purposes. Bohme abrasion test were applied at the end of every 5 cycles freezing-thawing cycles (60 cycles) under the influence of deicing salt (NaCl solution) in addition to various physical and mechanical property tests, on the products obtained from various manufacturers. As results;While all of the examined natural stone pavement products were completed the 60-cycle triple-combined effect program without disintegration, only the Concrete Block Tactile Pavement-Red pigment (CBTP-R) group from concrete pavement products was completed the 60-cycle triple-combined effect program without disintegrating. On the other hand, the Concrete Block Tactile Pavement-Yellow pigment (CBTP-Y) pavement product was the group that disintegrated in the shortest time under the triple-combined effect. It was determined that the basalt aggregate used on the upper surface of the concrete pavement products increased the resistance of these products against the triple-combined effect, but the yellow color pigment used in their compositions decreased their resistance against the triple-combined effect. © The Author(s), under exclusive licence to Shiraz University 2025.

关键词： Abrasion resistance Block pavements De-icing Salt Freeze-thaw cycles Triple-combined effect

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Structural and Rapid Assessment of Registered Historical Mosques;a Case Study for Bitlis 33rd

Structural and Rapid Assessment of Registered Historical Mos...

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33rd International Conference on Organization and Technology of Maintenance, OTO 2024

作者： Mişe, Okan Işık, Ercan Arkan, Enes Avcil, Fatih Faculty of Engineering and Architecture Department of Civil Engineering Bitlis Eren University Bitlis Turkey Faculty of Engineering and Architecture Department of Architecture Bitlis Eren University Bitlis Turkey

ISBN: (纸本)9783031805967

The transfer of cultural and historical heritage to the next generations is one of the subjects that connects the past and future of humankind and constantly attracts the attention of the academy. Within the scope of this study, registered mosques located in the city center of Bitlis, which is located in an important strategic location and where many different civilizations prevailed, were taken into consideration. Considering the current conditions of each mosque, structural deterioration and damage in the mosques were determined based on observation, and solution suggestions were presented. Building damage assessment of the mosques was carried out and damage forms based on observation were created. Risk levels were determined for all examined mosques using the rapid assessment method. As a result of the observational earthquake risk assessment, low risk was determined for the 12 examined mosques, while middle risk was determined for the other 4 mosques. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Earthquakes

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Appropriate Intersection Design Type Based on TOPSIS Multiple Criteria Decision Method with AIMSUN Mesoscopic Simulation

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Iranian Journal of Science and Technology - Transactions of civil engineering 2025年第2期49卷 1889-1899页

作者： Bayata, Halim Ferit Baş, Fatih İrfan Demircioğlu, Muhammed Sami Çolak, Muhammed Ali Department of Civil Engineering Faculty of Engineering and Architecture Erzincan Binali Yildirim University Erzincan Türkiye

The increasing world population has also increased the demand for vehicles and brought along various problems such as traffic delays, accidents, and air pollution. In addition, the increase in the number of vehicles causes an increase in the time spent at intersections, negatively affecting people’s quality of life, distracting drivers, and unsafe driving practices. Moreover, greenhouse gas emissions, including CO₂ and NOx from vehicles, cause climate change and deterioration of air quality. To solve these problems, in this study, seven signalized intersections on a corridor in the city center of Erzincan province were examined. Using the Aimsun traffic simulation program, factors such as CO₂, VOC, NOx emissions, queue length, delay time, travel time, and speed were evaluated. Using one of the multiple criteria decision methods, the TOPSIS method, the ideal scenario was determined based on the simulation results, considering the construction costs. The study revealed significant improvements in several parameters. CO₂ emissions were reduced by 10%, delay time by 35%, VOC emissions by 14%, NOx emissions by 13%, queue length by 35%, delay by 38%, and travel by 19%. Furthermore, the speed was increased by 15%. © The Author(s), under exclusive licence to Shiraz University 2025.

关键词： AIMSUN Intersections Multi-criteria decision Signalization Simulation TOPSIS

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Enhancing Snow Detection through Deep Learning: Evaluating CNN Performance Against Machine Learning and Unsupervised Classification Methods

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Water Resources Management 2025年 1-19页

作者： Kesikoglu, Mustafa Hayri Department of Civil Engineering Faculty of Engineering and Natural Sciences Usak University Usak64000 Turkey Department of Urban and Regional Planning Faculty of Architecture and Design Usak University Usak64000 Turkey

Snow cover is a crucial natural water resource that provides water storage. Monitoring snow cover is essential for sustainable water resource management. Accurate and efficient snow cover mapping is vital for water resource planning, flood control, and climate impact assessments. Remote sensing provides a cost-effective approach for monitoring snow cover dynamics, but classification accuracy remains a challenge. This study introduces a deep learning-based 1D convolutional neural network (1D CNN) approach for improved snow cover classification in mountainous regions utilizing Landsat 5 and 8 satellite images. The effectiveness of 1D CNN was compared with unsupervised classification (UC) methods (Normalized Difference Snow Index (NDSI), band ratio-based Red/Short wave infrared (R/SWIR), and Near infrared/Short wave infrared (NIR/SWIR)) and supervised machine learning classification methods (support vector machines (SVM) and classification and regression trees (CART)) in this research. The study was performed on Erciyes Mountain, Turkey, across four different years. Classifier performances were assessed using various quantitative (precision, recall, F-score, overall accuracy, kappa) and qualitative (mean squared error, Pearson correlation coefficient, structural similarity index measure, peak signal-to-noise ratio) evaluation metrics. Pairwise statistical analysis using McNemar’s test revealed significant differences between 1D CNN and the other classifiers. The findings demonstrated that the 1D CNN approach outperformed all other methods in achieving the highest accuracy in snow cover classification. These results indicate the potential of deep learning for enhancing snow cover assessment and supporting more effective water resource management strategies and policy-making. © The Author(s) 2025.

关键词： Support vector machines

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