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Comparative study and optimal selection for different cable-stiffened latticed shells

Thin-Walled structures 2022年 181卷

作者： Zhao, Lin Cao, Zhenggang Wang, Zhicheng Fan, Feng Key Lab of Structures Dynamic Behaviour 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

The cable-stiffened latticed shell can be constructed in varied structural forms by diverse types of single-layer latticed shells and cable-strut systems. So, to provide references for model selection, this paper studied the efficient combination of latticed shells and cable-strut systems in different boundary conditions and proposed a performance evaluation method. The general modeling process was illustrated firstly, and several new structural forms with folded curved surfaces were proposed. Then, based on the improved equilibrium matrix theory, the force-finding analysis was carried out for the initial state, which can guarantee actual mechanical properties in the numerical model. Thus, the overall stiffness, the bearing capacity, and the cable reinforcement effect were obtained through the nonlinear stability analysis. And for the optimal selection from multiple structural forms, AHP-TOPSIS was used to judge the latticed shell system for the first time. The comprehensive structural performances were evaluated and ranked by this multi-attribute decision-making method. Finally, the results showed that the complicated cable-strut system could not necessarily lead to higher structural efficiency. Regardless of the cable-strut layouts, the spherical cable-stiffened latticed shell had a high bearing capacity when the ribbed grid was adopted. For the cylindrical structure, the folded latticed shell divided by orthogonal grids maximized the role of in-plane cables and was considered the best choice. © 2022 Elsevier Ltd

关键词： Cables

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Shaking table test on 1000kV frame by considering coupling effect of transmission lines under longitudinal excitations

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2020年第3期53卷 51-59页

作者： Gong, Jun Zhi, Xudong Shang, Wennian Fan, Feng Wang, Haoyang Key Lab of Structure 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 Shandong Electric Power Engineering Consulting Institute Co. Ltd. Jinan250013 China

To figure out the influence mechanism of the dynamic coupling effect of transmission lines on seismic responses of the 1000 kV outgoing line frame under longitudinal excitations and discuss the influence of sag-span ratios of transmission lines, shaking table tests were performed on a single-span 1000 kV outgoing line frame by considering the dynamic coupling effect of transmission lines with a scale factor of 1:***, transmission lines were simulated by the massless springs with equivalent dynamic stiffness. Test results indicate that the seismic responses of 1000 kV frame are reduced by the strong dynamic coupling effect of transmission lines;with the decrease in sag-span ratio, the energy dissipated by the suspended system increases and the elastic constraints of transmission lines on the frame enhance, resulting in further reducing the seismic responses of 1000 kV frame. Furthermore, the results of numerical reconstruction analysis of the experiments indicate that the finite element analysis can simulate the dynamic coupling effect between transmission lines and 1000 kV frame very well. © 2020, Editorial Office of China Civil Engineering Journal. All right reserved.

关键词： Electric lines

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Influence of Mix Proportioning Parameters and Curing Regimes on the Properties of Ultra-High Strength Alkali-Activated Concrete

SSRN

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SSRN 2023年

作者： He, Haiyu Zhang, Rong Song, Yuhuan Zhi, Xudong Fan, Feng Key Lab of Structures Dynamic Behaviour 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

This study investigates the influence of mix proportioning parameters and curing regimes on the material properties of alkali-activated binder-based ultra-high strength concrete (AAB-UHSC). The effects of five groups of mix proportioning parameters (i.e., fly ash replacement ratio, silica fume replacement ratio, alkali to binder ratio, water glass modulus, and steel fiber content) and three curing regimes(i.e., ambient curing, standard curing, and hybrid curing) on the workability, compressive strength, flexural strength and microstructure development of AAB-UHSC were systematically evaluated. The results indicated that increasing the steel fiber and silica fume dosage negatively affected the flowability of freshly mixed AAB-UHSC. There existed an optimal alkali-to-binder ratio and water glass modulus in terms of flowability, compressive strength, and flexural strength, but the fly ash replacement ratio had a complex effect on the material performance of the AAB-UHSC. The microstructures of the specimens cured in hybrid curing regimes were denser, and fewer cracks were observed, which resulted in higher strength compared to specimens cured under ambient curing and standard curing conditions. The three types of curing regimes adopted barely alter the phases and molecular bonds of hydration products based on the XRD and FTIR results. In addition, the correlations between the compressive strength of the AAB-UHSC obtained under ambient curing conditions, standard curing conditions, and obtained under hybrid curing and standard curing conditions were analyzed, and the fitted results had higher correlation coefficients (R2). © 2023, The Authors. All rights reserved.

关键词： Compressive strength

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Multi-species ionic transport model for concrete coupling ion-cement hydrate interactions into Nernst-Planck equation

Multi-species ionic transport model for concrete coupling io...

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第三届中国国际复合材料科技大会

作者： Bingbing Guo Yi Hong Guofu Qiao Jinping Ou Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology Centre for Composite Material and Structure Harbin Institute of Technology

Reinforced concrete(RC) structures are widely used in civil engineering, but the ingress of chloride ions is one of the major factors that deteriorate the durability of RC structures. Thus, many numerical models have been reported to study the mass transport of cement-based material in the previous papers. However, most of these models did not consider the interactions between ions in the pore solution and the cement hydrate or considered the interactions by modifying the diffusion coefficients. This research presents a multi-species ionic transport model for concrete that couples ion-cement hydrate interactions into Nernst-Planck equation. Firstly, a two-phase FEM concrete geometric model that included mortar phase and coarse aggregate phase was built. Moreover, the surface complexation model and the phase-equilibrium model were used to simulate the ion-cement hydrate interactions, and Nernst-Planck equation was used to simulate the effect of the driving forces of the concentration and electric field gradients in the concrete, which were conducted by using PHREEQC code and COMSOL, respectively. Then, the interactive interface that coupled the ion-cement hydrate interactions and Nernst-Planck equation was established by using MATlab language. Finally, the results of the numerical multi-species ionic transport model for concrete were verified by the experimental data published in the previous paper.

关键词： concrete multi-species transport model ion-cement hydrate interactions Nernst-Planck equation

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Seismic Behavior of Steel Plate Shear Walls-Steel Frame

Seismic Behavior of Steel Plate Shear Walls-Steel Frame

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The 2nd International Conference on Materials Science and Engineering Technology (MSET 2015)

作者： SHAO Fengru SHAO Yongsong Transportation Dept China Academy of Civil Aviation Science and Technology Key Lab of Structures Dynamic Behaviour and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology

A model with the ratio of 1:4 of a six layers' semi-rigid steel frame-steel plate shear wallssystem has been tested on the shaking *** strain variation of the steel plate shear wallsand the system's seismic behaviors to different kinds of seismic waves from four different siteclassification and with different peakaccelerationwere analyzed to provide theoretical and experimental evidence to the real projects.

关键词： semi-rigidjoints frame-shearwalls shaking table testing seismic behavior

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考虑非线性相关性影响的结构整体可靠度评估——增强型高阶矩方法

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Acta Mechanica Sinica 2023年第4期39卷 3-13页

作者：宋鹏彦王涛吕大刚 College of Civil Engineering and Architecture Hebei UniversityBaoding071002China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin150040China Chongqing Research Institute of Harbin Institute of Technology Harbin Institute of TechnologyChongqing401151China Key Lab of Structure Dynamic Behavior and Control of China Ministry of Education Harbin Institute of TechnologyHarbin150090China

考虑随机变量间相关性的复杂工程结构整体可靠性分析仍然是一个挑战,特别是对于非线性相关问题.该文考虑到随机变量之间非线性相关的影响,提出了一种用于结构整体可靠性分析的增强型高阶矩方法.该文首先回顾了传统的Nataf变换,进而通过... 详细信息

考虑随机变量间相关性的复杂工程结构整体可靠性分析仍然是一个挑战,特别是对于非线性相关问题.该文考虑到随机变量之间非线性相关的影响,提出了一种用于结构整体可靠性分析的增强型高阶矩方法.该文首先回顾了传统的Nataf变换,进而通过引入Copula理论提出了广义Nataf变换;其次,采用状态变量描述法统一描述整体可靠性问题对应的功能函数,并发展了基于GL_(2)-偏差点集的状态变量高阶矩估计和灵敏度分析方法;再次,通过改进的最大熵法准确估计了结构整体可靠度;最后,通过两个算例验证了所提方法的准确性和有效性以及考虑随机变量间的非线性相关性对结构整体可靠度影响的必要性.算例结果与蒙特卡洛模拟方法比较表明,随机变量间的非线性相关性对结构的整体可靠度有显著影响,所提方法对结构高阶矩估计和全局可靠度分析具有较高的精度和效率.

关键词：最大熵法非线性相关整体可靠性随机变量状态变量可靠度评估蒙特卡洛模拟方法功能函数

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A Study Using the Combined Method of Scientometric and Manual Analysis on the Present Research of Plant Fibres Reinforced Concrete

SSRN

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SSRN 2022年

作者： Pan, Yunshi Li, Shuangxin Deng, Ling Shi, Youyu Wang, Jiarui Zhang, Faqi School of Civil Engineering Northeast Forestry University Harbin150060 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Anqiu Water Resources Bureau Anqiu262100 China

As one of the most important supporting technologies to economic development and urbanisation, concrete becomes a crucial link to reduce the global carbon emission and confronts with an unprecedented challenge of decarbonation. The reinforcement by plant fibres in concrete is one of promising approaches to decarbonise concrete. This paper combines scientometric and manual analysis to evaluate the research progress on plant fiber reinforced concrete (PFRC), revealing the prevailing research domains and focuses on PFRC and the work performance of PFRC. The main challenges confronted by PFRC are discussed and and future research scope are proposed at the end. © 2022, The Authors. All rights reserved.

关键词： Thermal insulation

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Uniaxial Stress-Strain Relationship and Thermal Properties of Concrete with Fine Recycled Aggregate Under Elevated Temperatures

SSRN

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SSRN 2022年

作者： Zhang, Huan Zhao, Hui Liu, Faqi Yang, Hua Pan, Kainan Key Lab of Structures Dynamic Behaviour and Control of 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 Department of Civil Engineering Tianjin University Tianjin30072 China College of Civil Engineering Taiyuan University of Technology Taiyuan030024 China School of Engineering Harbin Institute of Technology Harbin150090 China

The models for the stress-strain relationship under elevated temperatures and thermal properties of recycled aggregate concrete (RAC) are essential in the fire resistance design of RAC structures, while no such models are available for RAC made with fine recycled aggregate (FRA). To establish the above models, 33 RAC prisms with three FRA replacement levels (0%, 50%, and 100%) under five temperatures (20 °C, 200 °C, 400 °C, 600 °C, and 800 °C) were tested for the uniaxial compressive stress-strain relationship;Meanwhile, thermal properties (including the specific heat, thermal conductivity, and thermal expansion) of these concrete mixes under a temperature range of 20-800 °C were also tested. A prediction model for the stress-strain relationship under elevated temperatures was proposed by extending the model for RAC under normal temperatures. Based on the test data, models for the thermal properties of RAC with FRA were also established. Results showed that the FRA does not change the shear failure mode of concrete, and its influence on the stress-strain relationship is independent of temperature;the specific heat increases while the thermal conductivity decreases with the FRA replacement ratio;the thermal expansion of concrete under temperature higher than 500 °C decreases with FRA;the proposed models have a good prediction for the stress-strain relationship and thermal properties of RAC. © 2022, The Authors. All rights reserved.

关键词： Stress-strain curves

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Experiment and Analysis on Flexural Behavior of Uhpc Encased Steel Beams

SSRN

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SSRN 2024年

作者： Wang, Kun Wang, Jiahui Omar, Ahmed Ahmad Luo, Huihui Yang, Yang Chen, Zaixian Tao, Qiyu College of Civil Science and Engineering Yangzhou University Yangzhou225127 China Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Heilongjiang Harbin150090 China Guangling College Yangzhou University Yangzhou225127 China Key Lab of Civil Engineering Structure and Disaster Prevention in Universities of Shandong Harbin Institute of Technology at Weihai Shandong Weihai264209 China

To improve the normal section design approach for ultra-high-performance concrete (UHPC) encased steel beams, this paper first conducted a flexural experiment on eight simply supported UHPC encased steel beams, where the test parameters included the longitudinal reinforcement ratio in tension, the width and thickness of H-shaped steel flanges, the strength grade of H-shaped steel, and the location of H-shaped steel. Then, the calculation method of the flexural capacity of the UHPC encased steel beams was proposed based on the position of the neutralization axis. The short-term stiffness before and after cracking, as well as the average crack width, were established by considering the effect of the steel fibers. Finally, a finite element model of the UHPC encased steel beam was constructed using reasonable material relations and compared with the test results for validation. The results showed that the longitudinal steel bars and the lower flanges of the UHPC encased steel beams first reached a yielding state, and then the upper UHPC was crushed, exhibiting an under-reinforced damage pattern. Increasing the longitudinal reinforcement ratio, the width and thickness of the H-shaped steel flange, the strength grade of the steel, and offsetting the H-shaped steel downward can effectively increase the vertical load-carrying capacity. Due to the high compression strength of the UHPC and the small depth of the compression zone, the upper flanges of the H-shaped steels for some UHPC encased steel beams did not reach yield. Concerning the presence of the H-shaped steel, after the upper UHPC in the span was crushed, the falling branches of the vertical load-deflection curves flattened, showing good ductility. The equivalent stress coefficient k in tension is suggested to be 0.7 when calculating the flexural capacity. For predicting the post-crack stiffness and the average crack width, the fiber influence coefficients B and w are recommended to be 0.2 and 0.3, respectively. The

关键词： Stiffness

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LQD-RKHS-based distribution-to-distribution regression methodology for restoring the probability distributions of missing SHM data

arXiv

引用

arXiv 2018年

作者： Chen, Zhicheng Bao, Yuequan Li, Hui Spencer, Billie F. Key Lab of Intelligent Disaster Mitigation of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China Department of Civil and Environmental Engineering University of Illinois at Urbana-Champaign UrbanaIL United States Department of Civil and Environmental Engineering University of Illinois at Urbana - Champaign UrbanaIL United States

Data loss is a critical problem in structural health monitoring (SHM). Probability distributions play a highly important role in many applications. Improving the quality of distribution estimations made using incomplete samples is highly important. Missing samples can be compensated for by applying conventional missing data restoration methods;however, ensuring that restored samples roughly follow underlying distributions of true missing data remains a challenge. Another strategy involves directly restoring the probability density function (PDF) for a sensor when samples are missing by leveraging distribution information from another sensor with complete data using distribution regression techniques;existing methods include the conventional distribution-to-distribution regression (DDR) and distribution-to-warping function regression (DWR) methods. Due to constraints on PDFs and warping functions, the regression functions of both methods are estimated from the Nadaraya-Watson kernel estimator with relatively low degrees of precision. This article proposes a new indirect distribution-to-distribution regression method in the context of functional data analysis for restoring distributions of missing SHM data. PDFs are transformed to ordinary functions residing in a Hilbert space via the newly proposed log-quantile-density (LQD) transformation;the regression for distributions is realized in the transformed space via a functional regression model constructed based on the theory of Reproducing Kernel Hilbert Space (RKHS), corresponding result is subsequently mapped back to the density space through the inverse LQD transformation. Test results using field monitoring data indicate that the new method significantly outperforms conventional methods in general cases;however, in extrapolation cases, the new method is inferior to the distribution-to-warping function regression method. Copyright © 2018, The Authors. All rights reserved.

关键词： Probability distributions

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