检索结果-内蒙古大学图书馆

arXiv 2025年

作者： Deng, Yuanpeng Kang, Peilin Xu, Xiang Li, Hui Parrinello, Michele Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China Atomistic Simulations Italian Institute of Technology Genova16156 Italy

The emergence upon cooling of an ordered solid phase from a liquid is a remarkable example of self-assembly, which has also major practical relevance. Here, we use a recently developed committor-based enhanced sampling method [Kang et al., Nat. Comput. Sci. 4, 451-460 (2024);Trizio et al., arXiv:2410.17029 (2024)] to explore the crystallization transition in a Lennard-Jones fluid, using Kolmogorov’s variational principle. In particular, we take advantage of the properties of our sampling method to harness a large number of configurations from the transition state ensemble. From this wealth of data, we achieve precise localization of the transition state region, revealing a nucleation pathway that deviates from idealized spherical growth assumptions. Furthermore, we take advantage of the probabilistic nature of the committor to detect and analyze the fluctuations that lead to nucleation. Our study nuances classical nucleation theory by showing that the growing nucleus has a complex structure, consisting of a solid core surrounded by a disordered interface. We also compute from the Kolmogorov’s principle a nucleation rate that is consistent with the experimental results at variance with previous computational estimates. Copyright © 2025, The Authors. All rights reserved.

关键词： Nucleation

来源：评论

学校读者我要写书评

暂无评论

A two-dimensional coupled energy-mass transfer model for simulating rain-on-snow load dynamics on roofs

引用

Cold Regions Science and Technology 2025年 238卷

作者： Zhang, Qingwen Bajracharya, Diwas Key Laboratory of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Climate changes have led to an increase in the frequency and severity of rain-on-snow (ROS) events, risking structural safety with increasing roof snow loads. These events involve melting, freezing, and compaction induced by water infiltration in roof snowpacks. Existing models assume snow as a homogeneous medium with uniform ROS load distribution while ignoring critical phenomena like phase changes, heterogeneity, and evolution of snowpack's properties that alter water retention in snow. Although snow load is adjusted based on slope and roof geometry, these adjustments are not considered for ROS surcharge load. A two-dimensional coupled energy-mass (EM) transfer model using the Multi-point Flux Approximation method (MPFA) is employed to simulate ROS load on sloped roofs along with heat exchange, melting, refreezing, and compaction effects. Compared to simplified mass transfer models, the EM transfer model exhibits superior predictive capabilities when evaluated against experimental results. Although melting and compaction significantly increased the density, reducing porosity and permeability, the melted water accelerated saturation at the bottom boundary, enabling quicker outflow conditions. A non-uniform triangular water retention pattern at the lower roof edge was observed in both models, suggesting that heterogeneity has minimal impact on the water retention profile. Under the studied ROS load conditions, the ROS load at the roof edge is 1.6 times the overall ROS load due to non-uniform water retention. The study highlights the inadequacy of existing design code as the design ROS load is inapplicable to the studied ROS condition, despite localized loads being close to design ROS load (0.38 kN/m2). © 2025

关键词： Osmosis

来源：评论

学校读者我要写书评

暂无评论

Main Research Directions and Evolutionary Trends of BIM Based on Bibliometric Analysis

Main Research Directions and Evolutionary Trends of BIM Base...

引用

2023 International Conference on Construction and Real Estate Management: The Human-Centered Construction Transformation, ICCREM 2023

作者： Man, Qingpeng Dong, Yifan Lu, Di Yuan, Zhenmin Lab of Structures Dynamic Behavior and Control of the Ministry of Education Lab of Smart Prev. and Mitigation of Civ. Eng. Disasters of the Min. of Indust. and Info. Technology Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China China International Engineering Consulting Corporation Beijing China School of Management Engineering Shandong Jianzhu Univ. Jinan China

ISBN: (数字)9780784485217

ISBN: (纸本)9780784485217

BIM technology has been valued by the construction industry and its academic community. Its innovative concepts and application value have promoted the mode innovation and sustainable development of the construction industry. This study aims to reveal the current status and trends of BIM research since 1998 through bibliometric analysis, and then to put forward relevant suggestions. The literature data is selected from the Web of Science (WOS) and china National Knowledge Infrastructure (CNKI) databases, and the related results are presented through bibliometric analysis, co-word analysis, theme evolution analysis, and visualization algorithms. By comparing domestic and international BIM related literature, this study draws the hot word clusters and evolution trend maps, discusses the research directions and evolutionary trends, and summarizes the recent research hotspots. These study results provide reference directions and guidance for theoretical research and practical application of future Chinese BIM. © ASCE.

关键词： Construction industry

来源：评论

学校读者我要写书评

暂无评论

Research on Local Heating Technology in Extremely Low Temperature Environment Based on Thermal Comfort and CFD 18

Research on Local Heating Technology in Extremely Low Temper...

引用

18th IBPSA Conference on Building Simulation, BS 2023

作者： Wang, Zhen Zhang, Yuanyuan Gao, Hu Xia, Yun Wu, Yue Liu, Jing School of Architecture Harbin Institute of Technology Heilongjiang Harbin150006 China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology China Heilongjiang Province Academy of Cold Area Building Research Heilongjiang Harbin150080 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

This paper investigated the effect of personal heating technology on human thermal comfort and skin temperature in extremely low temperature environment. Four subjects carried out personal heating experiments in a low temperature laboratory at around -21°C. Personal heating equipment includes heating glove, heating cushion, heating mat and airwarmer. In order to maximize the thermal comfort of personnel, this paper designed an efficient local heating system based on airwarmer and heating mat. At the same time, in order to better evaluate the thermal comfort of personnel in an extremely low temperature environment, an improved one-dimensional stolwijk human thermoregulation model(HTM) was established. By combining it with CFD, the influence of the airwarmer on the thermal comfort of personnel and skin temperature was simulated. This method can be used to assess the overall thermal sensation and thermal comfort of personnel in extremely low temperature environment. © 2023 *** rights reserved.

关键词： Thermal comfort

来源：评论

学校读者我要写书评

暂无评论

Numerical Analysis on the Effect of Vital Design Parameters on the Seismic Performance of Shear Walls with Horizontal Ring Connection 7

Numerical Analysis on the Effect of Vital Design Parameters ...

引用

7th International Conference on Environmental Science and Civil Engineering, ESCE 2021

作者： Zhou, Jian Zhang, Tao Li, Liming Guo, Zhipeng Shi, Qiancheng China Construction Science and Technology Group Co. Ltd. Beijing100195 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

Prefabricated shear walls are currently widely applied in mid-to-high-rise structures. As a new type of structural form of assembled shear walls, the ring connection assembled concrete shear wall has clear mechanical mechanism, easy construction and better performance and other significant advantages, which are gradually being applied in actual engineering. However, few systematic studies are carried on this new type of shear wall structure, and a complete theoretical system for guiding the design could not be given, especially in terms of mechanical mechanism and seismic performance, more detailed research work is needed. This paper uses numerical simulation as the main method to study the influence of different design variables such as shear span ratio, buckle size, axial compression ratio on the mechanical properties of the connection area in shear wall and the overall seismic performance of the structure. In this way, the theoretical basis for further optimizing the structural performance of the shear wall connection with ring connection. © Published under licence by IOP Publishing Ltd.

关键词： Shear walls

来源：评论

学校读者我要写书评

暂无评论

Optimal placement of multiple types of sensors based on Bayesian system identification using heuristic-enhanced deep reinforcement learning

引用

Engineering structures 2025年 338卷

作者： Zhong, Qunhong Wei, Shiyin Huang, Yong Jia, Kailiang Li, Hui Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

The advanced structural health monitoring system, integrating multiple types of sensors, provides a comprehensive method for monitoring structural information, effectively identifying abnormal changes, and ensuring the safety of structures in service. However, determining the optimal placement of multiple types of sensors is a challenging combinatorial optimization problem due to its discrete and non-convex nature. The algorithm for optimizing multi-type sensor layouts must be able to handle these complexities effectively. In this paper, a novel multi-type sensor optimal placement algorithm based on heuristic-enhanced deep reinforcement learning (DRL) is proposed. This approach improves algorithm efficiency by initializing with high-quality configurations generated during agent's exploration process. Based on the information entropy and Bayesian theory, we establish a reward function to evaluate the effectiveness of multi-type sensor placement schemes. Three case studies are presented to verify the performance of the proposed algorithm in optimizing sensor placement. Our experiments indicate that adding excessive sensors does not significantly improve monitoring effectiveness, which highlights the necessity of strategically positioning sensors at the most critical data points by optimizing sensor placement to achieve efficient and effective monitoring. We find that incorporating heuristic-based exploration experience significantly boosts the optimization performance of deep reinforcement learning (DRL) algorithm, yielding superior results. The comparison study with other optimization methods also highlights the higher efficiency of our proposed method. © 2025

关键词： Convex optimization

来源：评论

学校读者我要写书评

暂无评论

Evaluation on the Failure Modes and Progressive Collapse Resistance of Self-Centering Infilled Precast Concrete Frame

SSRN

引用

SSRN 2023年

作者： Wang, Haoran Li, Shuang Zhai, Changhai Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

In this study, the refined finite element (FE) models for the collapse resistance of self-centering precast concrete (PC) frames with and without infill walls were established. Based on the validated FE models, the effects of different design parameters on the failure modes at the beam ends as well as the collapse resistance of the structures were carried out. Correspondingly, the reasonable optimization measures were suggested to reduce the concrete damage at the beam ends. The results indicated that the insufficient stirrup spacing may cause the concrete failed prematurely along the edge of the steel jackets due to stress concentration. Decreasing the thickness of steel angles could reduce the failure area of concrete at the beam ends, but also caused a significant reduction in the initial stiffness and vertical resistance of the structures. The thickness of steel jackets mainly influenced the size of failure area at the beam ends. The position of horizontal bolts and longitudinal bolts had effects on the failure modes of concrete at the beam ends as well as the collapse resistance of the structures, while the latter was particularly evident. Compared to the cast-in-place RC frames with the same size and reinforcement ratio, the damage extent at crucial locations of the optimized self-centering PC frame structures was lower, while exhibiting more excellent collapse resistance. A calculation model considering the resistance contribution of structural and non-structural infill wall members was proposed to predict the vertical resistance of self-centering PC frame structures in the compressive arch action (CAA) stage. © 2023, The Authors. All rights reserved.

关键词： Precast concrete

来源：评论

学校读者我要写书评

暂无评论

Identification of Chloride Diffusion Coefficient in Concrete Using Physics-Informed Neural Networks

SSRN

引用

SSRN 2023年

作者： Wan, Yutong Zheng, Wenzhong Wang, Ying Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

The corrosion of steel caused by chloride is one of the important causes of the deterioration of reinforced concrete structures. In order to describe the transport behavior of chlorides in concrete and to make quantitative durability designs based on it, it is necessary to determine the chloride diffusion coefficient correctly. However, the commonly used analytical method is not suitable for the free chloride diffusion coefficient considering the nonlinear chloride binding capacity of concrete. In this study, by comparing the results of solving forward problems involving chloride transport equations using finite element method (FEM) and solving corresponding inverse problems using physics-informed neural networks (PINNs), it is verified that PINNs can be applied to identify the chloride diffusion coefficient in non-steady-state immersion tests and accelerated chloride migration tests considering no chloride binding, Langmuir binding, or Freundlich binding. The robustness of PINNs is verified by training with 5% noise data as observed data. The results of interpolation and extrapolation using PINNs trained successfully show its excellent generalization performance. © 2023, The Authors. All rights reserved.

关键词： Diffusion

来源：评论

学校读者我要写书评

暂无评论

Stability Analysis and Design Methods of Steel Pipe Piles in Extreme Marine Corrosive Environments

SSRN

引用

SSRN 2023年

作者： Han, Xinhao Liu, Changyong Hu, Qing Su, Andi Zhang, Sumei Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Steel pipe piles (SPPs) are commonly applied for marine platform foundations due to high bearing capacity. However, for SPPs in corrosive marine environments, the corrosion on the steel tube is severe and shows a non-uniform distribution along the height direction, resulting in the significant decrease of the stability bearing capacity. To investigate the stability performance of SPPs in marine corrosive environments, the corroded SPPs are simplified into five-segment stepped columns, and the equilibrium differential equations are established to obtain the rotational stiffness relationship. The accurate solutions of the critical buckling loads of five-segment stepped columns under arbitrary boundary conditions are obtained by iterative methods. Besides, considering the material and geometrical nonlinearity, the finite element (FE) model of corroded SPPs is established and then verified based on existing test results. The effects of the number of segments and stiffness ratios among different segments on the bearing capacity are analysed. Furthermore, considering the interactions among different segments, the calculation methods for the stability bearing capacity of stepped columns under axial compression and combined compression-bending are proposed respectively. The comparison between calculated and FE results indicates that the proposed calculation methods have good prediction accuracy and can be available for practical engineering reference. © 2023, The Authors. All rights reserved.

关键词： Bearing capacity

来源：评论

学校读者我要写书评

暂无评论

General Effect of Internal Span of U-shaped Stud on UHPC-NC Interfacial Failure Load 9th

General Effect of Internal Span of U-shaped Stud on UHPC-NC ...

引用

9th International Conference on Civil Engineering and Materials Science, ICCEMS 2024

作者： Wu, Zhongchong Liu, Dayong Wu, Xiangguo Zhang, Yun Wu, Chengen Lin, Lanri Zhong, Jing Zhu, Hongbing Zhou, Ruiquan You, Xianhui CGN New Energy Holdings Co. Ltd. Beijing China Fujian Provincial Key Laboratory of Multi-Disasters Prevention and Mitigation in Civil Engineering College of Civil Engineering Fuzhou University Fuzhou350108 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of the Industry and Information Technology Harbin Institute of Technology Harbin150090 China College of Civil Engineering Fuzhou University Fuzhou350108 China Sinovel Wind Group Co. Ltd Beijing100086 China Shanghai Electric Wind Power Group Co. Ltd Shanghai200233 China Wind Power Hybrid Tower Co. Ltd Fulaerji161042 China China Power Engineering Consulting Group CO. LTD Beijing100120 China

ISBN: (纸本)9789819615735

To improve the durability design level of the foundation bearing platform for offshore fixed wind power, Ultra-high performance concrete (UHPC) is used as a non-demolding membrane shell system, and a high-performance composite concrete bearing platform structure is formed with on-site pouring of core concrete. The interface performance between the prefabricated UHPC membrane shell and the post cast core concrete has become an important aspect of the overall integrity of the high-performance composite concrete bearing platform. The use of interface shear key design to improve interface integrity is necessary for improving the overall stress of the bearing platform structure. The objective of this study is to assess the effect of the internal span on the shear behavior at the junction of UHPC and normal concrete (NC). © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Ultra-high performance concrete

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：