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Hysteretic energy prediction method for mainshock-aftershock sequences

Earthquake Engineering and Engineering Vibration 2018年第2期17卷 277-291页

作者： Zhai Changhai Ji Duofa Wen Weiping Li Cuihua Lei Weidong Xie Lili Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHeilongjiangHarbin 150090China School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

structures located in seismically active regions may be subjected to mainshock-aftershock（MSAS）*** study selected two kinds of MSAS sequences,with one aftershock and two aftershocks,*** aftershocksThe MSAS sequence with one aftershock exhibited a 10%to 30%hysteretic energy increase,whereas the MSAS sequence with two aftershocks presented a 20%to 40%hysteretic energy ***,a hysteretic energy prediction equation is proposed as a function of the vibration period,ductility value,and damping ratio to estimate hysteretic energy for mainshockaftershock sequences.

关键词： hysteretic energy mainshock-aftershock sequences SDOF system relative intensity prediction equation

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Optimisation route of embodied carbon emissions and cost of prefabricated buildings: A case study of prefabricated shear wall residential structures

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Energy and Buildings 2025年 343卷

作者： Yifan Dong Qingpeng Man Yadi Zhang Yuan Chang School of Civil Engineering Harbin Institute of Technology Harbin 150001 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150009 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 150009 China School of Management Science and Engineering Central University of Finance and Economics Beijing 100081 China

Prefabricated buildings are increasingly replacing traditional cast-in-place concrete structures to reduce construction time and environmental impacts. However, prefabricated components frequently struggle to simultaneously achieve economic cost-effectiveness and carbon emissions reduction. Thus, the construction industry urgently requires component-level technical guidance on prefabricated construction to ensure economic feasibility while also supporting carbon neutrality goals. This study used a typical prefabricated shear wall residential building as a case study to improve the economic and environmental performance of prefabricated building construction. Seven types of structural components are examined, including interior shear walls (ISW) and exterior shear walls (ESW), composite floor slab. (CFS), air-conditioning panels/canopies (A/C), stair landings (SL), beams (BM), and stair flights (SF). By systematically replacing cast-in-place components with their prefabricated counterparts using Revit and Glodon soft tools, the study quantifies and analyses the differences in carbon emissions and costs. The key results are: (i) The optimal replacements for minimising carbon emissions are “BM → SL → SF → CFS → ESW → ISW → A/C,” whereas the most economical cost-effective sequence is “BM → SL → SF → A/C → ISW → ESW → CFS.” (ii) Prefabrication does not universally result in lower carbon emissions. Among the seven types of components, four exhibit higher carbon emissions per unit volume of concrete than their cast-in-place counterparts, with the highest value of CFS (86.2 kg/m 3 ). (iii) To achieve carbon emissions reduction through prefabrication, an optimal prefabrication rate of 3.8–10.6 % is recommended. Within this range, increasing the prefabrication rate results in cost increases while enabling carbon reduction. However, exceeding the 10.6 % cap rate results in both higher costs and carbon emissions compared to traditional cast-in-place methods.

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Numerical simulation and experimental validation of moisture-heat coupling for saturated frozen soils

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Research in Cold and Arid Regions 2017年第3期9卷 250-257页

作者： Zhi Ming Li Jian Chen Kai Sun Bin Zhang Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology Heilongjiang Water Conservancy Science Research Institute

In seasonally frozen regions,freezing-and-thawing action is the main cause responsible for the destruction of canals,which is closely linked to the temperature gradient and water *** investigate the behaviour of soils under freezing-and-thawing actions,many numerical models have been established that consider the important coupling of moisture transport and temperature evolution;but they contain excessive parameters,some of which are rather difficult to *** on the well-known Harlan's theory,a simple moisture-heat coupling model was recently proposed to quantify the coupled moisture-heat transport performance of soils in terms of the central temperature and *** mathematical module of COMSOL Multiphysics was further employed to solve the governing equations *** validate our model,a thorough experimental scheme was carried out in our *** measured temperature distribution was found to be consistent with the predicted results.

关键词： saturated frozen soil moisture-heat coupling freezing-and-thawing action canal

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Analysis of post-tensioned precast segmental bridge piers reinforced with steel and FRP bars 8

Analysis of post-tensioned precast segmental bridge piers re...

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8th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, CICE 2016

作者： Wang, Zhenyu Cai, Zhongkui Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9789881448026

The rapid construction nature and outstanding self-centring ability make the post-tensioned precast segmental (PTPS) bridge pier a promising alternative to traditional cast-in-place piers. In this paper, PTPS piers reinforced with both steel and fibre reinforced polymer (FRP) bars were numerically analyzed. This type of pier is referred to as a hybrid bars reinforced PTPS bridge pier in this paper. The steel bars which continuously cross the segment joints (referred to as ED bars) were expected to improve the energy dissipation ability of the PTPS piers, while the FRP bars were expected to increase the post-yield stiffness and to decrease the residual displacement. Monotonic and cyclic analyses on hybrid bars reinforced PTPS piers were subsequently conducted. Three parameters were investigated, namely, the mechanical properties of FRP bars, the FRP bar reinforcement ratio and the proportion of FRP bars to ED bars. According to the analysis results in this study, the FRP bars are effective on improving the self-centring ability of the hybrid bars reinforced PTPS piers. Copyright © 2016 Department of Civil and Environmental Engineering & Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University.

关键词： Energy dissipation

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Wind load prediction of large-span dry coal sheds based on grnn and its application 9th

Wind load prediction of large-span dry coal sheds based on g...

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9th International Structural Engineering and Construction Conference: Resilient structures and Sustainable Construction, ISEC 2017

作者： Sun, Ying Yang, Lin Wu, Yue Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043748

The distribution and fluctuation of wind load on large-span dry coal sheds are complicated. Wind load on typical shape of roofs can be sometimes determined based on the wind tunnel tests carried out on roofs of similar shape. To expand the application scope of the test data, Generalized Regression Neural Network (GRNN) is introduced. The prediction models on large-span dry coal are given, where the wind load is expressed by eight parameters: mean, RMS, skewness, kurtosis of wind pressure coefficients, three auto-spectral parameters (including descendent slope in high frequency range, peak reduced spectrum and reduced peak frequency) and coherence exponent for cross-spectra. Cross validation and trails are carried out to determine the parameter in the GRNN model. Further, the wind load prediction is applied on a dry coal shed shell. The wind-induced responses are calculated and compared with the results of wind tunnel tests, with extremely close result. Therefore, it can be concluded that GRNN is feasible in predicting wind load on roof structures. Copyright © 2017 ISEC Press.

关键词： Neural networks

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Effects of temperature on drying shrinkage of concrete

Effects of temperature on drying shrinkage of concrete

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4th International Conference on Civil Engineering, Architecture and Building Materials, CEABM 2014

作者： Yang, Ying Zi Li, Mao Guang Deng, Hong Wei Liu, Qi Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

ISBN: (纸本)9783038351665

The present study investigated experimentally effects of temperature on drying shrinkage of concrete in different water cement ratio and containing mineral admixture. Concrete was exposed to a controlled environment of 20±1°C, 35±1°C, 50±1°C, and 60% ± 5 RH, respectively. The drying shrinkage of concretes with water cement ratio of 0.3, 0.4 and 0.5 were evaluated. The resuluts showed that with the increase of temperature from 20 °C to 50 °C, the influence of water cement ratio on drying shrinkage of concrete was gradually weakened. The shrinkage strain of concretes with replacement of cement by 20% of ground granulated blast- furnace slag (GGBS), 10% of silica fume (SF), and 20% of fly ash (FA)were measured, respectively. Test results showed that GGBS had a little impact on drying shrinkage of concrete;Silica fume could increase the drying shrinkage of concrete significantly in the early and later ages, especially when concrete was subjected to high temperature;Fly ash reduced drying shrinkage in early ages and increased drying shrinkage of concrete in the later ages. © (2014) Trans Tech Publications, Switzerland.

关键词： Cements

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Node shift method for stiffness-based optimization of single-layer reticulated shells

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2014年第2期15卷 97-107页

作者： Chang-yu CUI Bao-shi JIANG You-bao WANG School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Harbin 150090 China

This paper presents a node shift method to find the optimal distribution of nodes in single-layer reticulated shells. The optimization process searches for the minimum strain energy configuration and this leads to reduced sensitivity in initial imper- fections. Strain energy sensitivity numbers are derived for free shift and restricted shift where nodes can move freely in the 3D space or have to move within a predefmed surface respectively. Numerical examples demonstrate the efficiency of the proposed approach. It was found that optimized structures achieve higher ultimate load and are less sensitive to imperfections than the initial structure. The configuration of the final structure is closely related to factors like the initial structural configuration, spatial conditions, etc. Based on different initial conditions, architects can be provided with diverse reasonable structures. Furthermore, by amending the defined shapes and nodal distributions, it is possible to improve the mechanical behavior of the structures.

关键词： Node shifts Strain energy sensitivity Structural optimization Static stability Imperfection sensitivity

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Research on influence of thermosiphon layout on cooling effect on transmission line pile foundation in permafrost region

Research on influence of thermosiphon layout on cooling effe...

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2014 International Conference on Sensors Instrument and Information Technology, ICSIIT 2014

作者： Yu, Hao Lin Xu, Xue Yan Wang, Wei Li, Ming Xuan Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

ISBN: (纸本)9783038350392

Research work on the thermosiphon layout design of transmission line pile foundation in Geermu permafrost region was performed by finite element method and the influence of thermosiphon layout design on the temperature of soil around pile foundation was calculated and analyzed. The numerical calculation results indicated that the cooling effect of thermosiphon was obvious, but the coolling effect varied with the difference of thermosiphon layout design. The more thermosiphon bars were laid out aound pile foundation, the lower the temperature of soil around pile foundation. The cooling effect of thermosiphon on pile foundation and soil became weaker and weaker with the increment of the horizontal distance between soil and thermosiphon-pile. The layout design of 12 thermosiphon bars was the best for the transmission line pile foundation in permafrost region. © (2014) Trans Tech Publications, Switzerland.

关键词： Piles

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Estimating Ground Snow Load Based on Ground Snow Depth and Climatological Elements for Snow Hazard Assessment in Northeastern China

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International Journal of Disaster Risk Science 2022年第5期13卷 743-757页

作者： Huamei Mo Guolong Zhang Qingwen Zhang H.P.Hong Feng Fan Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China Department of Civil and Environmental Engineering University of Western OntarioLondonOntario N6A 5B9Canada

Extreme snow loads can collapse *** load is calculated based on the ground snow load(that is,the snow water equivalent on the ground).However,snow water equivalent(SWE) measurements are unavailab.e for most sites,while the ground snow depth is frequently measured and recorded.A new simple practical algorithm was proposed in this study to evaluate the SWE by utilizing ground snow depth,precipitation data,wind speed,and air *** the evaluation,the precipitation was clas sified as snowfall or rainfall according to the air temperature,the snowfall or rainfall was then corrected for measurement error that is mainly caused by wind-induced undercatch,and the effect of snow water loss was *** developed algorithm was applied and validated using data from57 meteorological stations located in the northeastern region of *** annual maximum SWE obtained based on the proposed algorithm was compared with that obtained from the actual SWE *** return period values of the annual maximum ground snow load were estimated and compared to those obtained according to the procedure suggested by the Chinese structural design *** comparison indicated that the use of the proposed algorithm leads to a good estimated SWE or ground snow *** use allowed the estimation of the ground snow load for sites without SWE measurement and facilitated snow hazard mapping.

关键词： Ground snow depth Ground snow load Northeastern China Precipitation data Snow hazard mapping Snow water equivalent

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Parametric modeling and stability analysis of temporary grandstand

Parametric modeling and stability analysis of temporary gran...

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4th International Conference on Civil Engineering, Architecture and Building Materials, CEABM 2014

作者： He, Lin Liu, Cong Wu, Zhen Yu Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin 150090 China

ISBN: (纸本)9783038351641

Temporary grandstands bear crowd load, which is created when spectators jumping on the structure. The simplified loads applied to temporary grandstand have been obtained based on experiment data of human body jumping forces. By the ABAQUS software, the parametric and automatic modeling of three-dimensional (3D) temporary grandstand structures has been realized with Python scripting. The linear buckling analysis and nonlinear buckling analysis of the structure have been carried out. The ultimate bearing capacity and the structural deformation under crowd load have been acquired. Results show that the nonlinear effect of the structure under crowd load is very obvious;the linear buckling analysis cannot get the ultimate bearing capacity of the structure and the first order buckling mode cannot simulate the final deformation of the structure either. The research of this paper greatly improve the efficiency of the construction and automation design of temporary structures and reveal the mechanical behavior of such structure to a certain degree. © (2014) Trans Tech Publications, Switzerland.

关键词： Python

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