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Performance-based methodology for assessing seismic vulnerability and capacity of buildings

Earthquake engineering and engineering Vibration 2010年第2期9卷 157-165页

作者： Lin Shibin1, Xie Lili1, 2,Gong Maosheng1,2 and Li Ming1,3 1.Institute of engineering Mechanics,China Earthquake Administration, Harbin 150080, China 2.school of Civil engineering,Harbin Institute of Technology,Harbin 150090, China 3.school of Civil engineering,Shenyang Jianzhu university,Shenyang 11016, China Institute of engineering Mechanics China Earthquake Administration Harbin 150080 China

This paper presents a performance-based methodology for the assessment of seismic vulnerability and capacity of buildings. The vulnerability assessment methodology is based on the HAZUS methodology and the improved capacity- demand-diagram method. The spectral displacement (Sd) of performance points on a capacity curve is used to estimate the damage level of a building. The relationship between Sd and peak ground acceleration (PGA) is established, and then a new vulnerability function is expressed in terms of PGA. Furthermore, the expected value of the seismic capacity index (SCev) is provided to estimate the seismic capacity of buildings based on the probability distribution of damage levels and the corresponding seismic capacity index. The results indicate that the proposed vulnerability methodology is able to assess seismic damage of a large number of building stock directly and quickly following an earthquake. The SCev provides an effective index to measure the seismic capacity of buildings and illustrate the relationship between the seismic capacity of buildings and seismic action. The estimated result is compared with damage surveys of the cities of Dujiangyan and Jiangyou in the M8.0 Wenchuan earthquake, revealing that the methodology is acceptable for seismic risk assessment and decision making. The primary reasons for discrepancies between the estimated results and the damage surveys are discussed.

关键词： performance-based vulnerability building damage seismic capacity software HAZUS

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Preparation of Granulated Adsorption Material of Water-quenched Slag/rectorite Composite for Removal of Cu(Ⅱ)Ions from Copper Smelter Wastewater

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Journal of Wuhan university of Technology(Materials Science) 2008年第3期23卷 372-375页

作者：王湖坤 school of Chemistry and Environmental engineering Hubei Normal University school of Resources and Environmental engineering Wuhan University of TechnologyWuhan 430070China

The preparation of granulated adsorption material of water-quenched slag/rectorite composite and the treatment of Cu （ Ⅱ ）-containing copper smelter wastewater with the adsorption material were studied. The experimental results showed that under the conditions with the mass ratio of water-quenched slag to rectorite of 1：1, 10% additive of industrial starch （IS）, and 50% water, and a calcination temperature of 400 ℃, the granulated adsorption material prepared had a density of 1.06 kg/m^3, a porosity of 62.29%, water absorption rate of 58.82%, and compressive strength of 2.22 MPa. The efficiency of wastewater treatment was the best, whereas the rate of spallation loss was low. Under the conditions of natural pH, with the addition of the granulated adsorption material of 0.05 g/mL, a reaction time of 40 minutes, and temperature of 25 ℃, the efficiency of the granulated adsorption material for the removal of Cu （ Ⅱ ） ions from the copper smelter wastewater attained 98.2%, and the quality indexes of the wastewater after treatment conformed with the first level of integrated wastewater discharge standard （GB8978-1996）. The reclamation of the used granulated adsorption material was carried out by de-sorption of the Cu （ Ⅱ） ions from the surface with 1 mol/L sodium chloride solution. The de-sorption rate was 96.4%, and the adsorption material can be reused many times to treat copper smelter wastewater.

关键词： water-quenched slag rectorite granulation reclamation copper smelter wastewater

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Theoretical analysis and experiment of micromechanics and mechanics-optics coupling of distributed optic-fiber crack sensing

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中国科学：技术科学英文版 2011年第S1期54卷 185-191页

作者： LIU HaoWu 1,2,CHEN Jiang 2,SUN Man 3 & DING Rui 2 1 State Key Laboratory of Hydraulics and Mountain River engineering,Sichuan university,Chengdu 610065,China 2.school of Water Resource Hydropower,Sichuan university,Chengdu 610065,China 3 school Electrical engineering and Information,Sichuan university,Chengdu 610065,China State Key Laboratory of Hydraulics and Mountain River engineering Sichuan University school of Water Resource Hydropower Sichuan University school Electrical engineering and Information Sichuan University

The micromechanical behaviors and mechanics-optics coupling effects of optic-fiber-concrete complex in the distributed optic-fiber sensing concrete-crack technology,which was used in health monitoring of Wu Gorge Bridge on Yangtze River and a large dam successfully,have been investigated.A micromechanical theoretical analysis method and micromechanical frictional contact bi-interface model,as well as a modified optical theoretical analysis method of the mechanics-optics coupling effects are presented.A series of verification experiments,including mechanical experiments and mechanics-optics coupling experiments,have been *** results of micromechanical theoretical analysis and the analysis of the modified theory of mechanics-optics coupling along with mechanical and optical experimental data are shown to be in close *** the micromechanical theory and the modified theory of mechanics-optics coupling with their analysis methods can not only enhance credibility of this novel distributed sensing technology but also provide a way to understand its sensing mechanism and optimize its technical details and system.

关键词： optic-fiber sensing mechanics-optics coupling micromechanics health monitoring concrete structure crack detection

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Fuzzy Evaluation of Thermal Comfort in Naturally Ventilated Residential Buildings in China

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湖南大学学报（自然科学版） 2009年第S1期36卷 71-74页

作者： WANG Yi1,NIU Tian-cai1,LIU Jia-ping2,XIAO Yong-qiang2,3(1.school of Environmental and Municipal engineering,Xi’an university of Architecture and Technology,Xi’an,Shaanxi 710055,China 2.school of Architecture,Xi’an university of Architecture and Technology,Xi’an,Shaanxi 710055,China 3.school of Physical Education,Xi’an university of Architecture and Technology,Xi’an,Shaanxi 710055,China) school of Environmental and Municipal engineering Xi'an University of Architecture and Technology Xi'an 710055 China school of Architecture Xi'an University of Architecture and Technology Xi'an 710055 China school of Physical Education Xi'an University of Architecture and Technology Xi'an 710055 China

In order to assess the differences between the human body thermal sensation in naturally ventilated space and that in air-conditioned space,the fuzzy evaluation model was adopted in the research of thermal sensation in naturally ventilated *** on the questionnaires and field measurements,the membership functions were presented by the statistic of the covering frequency to the fuzzy ***-bulb temperature was taken as the only independent variable for membership *** maximum values of membership grades are all at 0.5 or so,which is a distinction character on thermal comfort of naturally ventilated *** the calculating results of membership grades value to different fuzzy evaluation subsets,the Predicted Mean Vote(PMV)was ***,energy coefficient(Ea)was introduced to calculate the energy consumption,and the prediction methods of residential building energy consumption were also ***,the importance of evaluation model of thermal sense is shown through the energy consumption prediction in a specific residential building.

关键词： natural ventilated space thermal sensation fuzzy evaluation membership functions

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Relaxed delay-dependent exponential stability condition for a class of neural networks with polytopic uncertainties and distributed delays

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控制理论与应用（英文版） 2011年第2期9卷 302-306页

作者： Jianwei XIA 1,2,Hongbin ZHANG 3 1.school of Automation,Southeast university,Nanjing Jiangsu 210096,China 2.school of Mathematics Science,Liaocheng university,Liaocheng Shandong 252000,China 3.school of Electronic engineering,university of Electronic Science and Technology,Chengdu Sichuan 610054,China school of Automation Southeast University Nanjing Jiangsu China school of Mathematics Science Liaocheng University Liaocheng Shandong China school of Electronic engineering University of Electronic Science and Technology Chengdu Sichuan China

The global robust exponential stability of a class of neural networks with polytopic uncertainties and distributed delays is investigated in this ***-dependent Lypaunov-Krasovskii functionals and free-weighting matrices are employed to obtain sufficient condition that guarantee the robust global exponential stability of the equilibrium point of the considered neural *** derived sufficient condition is proposed in terms of a set of relaxed linear matrix inequalities (LMIs),which can be checked easily by recently developed algorithms solving LMIs.A numerical example is given to demonstrate the effectiveness of the proposed criteria.

关键词： Neural networks Polytopic uncertainties Distributed delays Delay-dependent Global robust exponential stability

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The Antifreeze Critical Strength of Low-temperature Concrete Effected by Index

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Journal of Wuhan university of Technology(Materials Science) 2011年第2期26卷 355-360页

作者：刘军 school of Material Science and engineering Shenyang Jianzhu University

The antifreeze critical strength and the pre-curing time of low-temperature concrete were studied by means of guaranteed rate of compressive strength and antifreeze performance for the structural safety requirement of concrete engineering,suffering once freeze damage under air *** is shown that the antifreeze critical strength is 3.7-4.4MPa,pre-curing time is 18-32 h by guaranteed rate of compressive strength,and the antifreeze critical strength is 3.7-4.4MPa,pre-curing time is 18-32 h by guaranteed rate of antifreeze *** can be found that the method of guaranteed rate of compressive strength is sensitive to the defect which generated by freeze damage in the concrete *** method is fit to evaluate the antifreeze critical strength of low-temperature concrete.

关键词： guaranteed rate of compressive strength guaranteed rate of antifreeze performance antifreeze critical strength once freeze under air environment

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Prognostic impact of preoperative nutritional and immune inflammatory parameters on liver cancer

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World Journal of Gastrointestinal Surgery 2024年第2期16卷 266-269页

作者： Sung uk Bae Department of Surgery School of MedicineDongsan Medical CenterKeimyung UniversityDaegu KS002South Korea

The immune response to tissue damage or infection involves inflammation,a multifaceted biological process distinguished by immune cell activation,mediator secretion,and immune cell recruitment to the site of *** blood-based immune-inflammatory biomarkers with prognostic significance in malignancies have been *** this issue of the World Journal of Gastrointestinal Surgery,they examined the prognosis of liver cancer radical resection in relation to pre-operative systemic immune-inflammation and nutritional risk *** older and younger individuals often reveals compromised nutritional and immu-nological statuses in the ***,performing preoperative evaluations of the nutritional status and immunity in geriatric patients is *** addition to being a primary treatment modality,radical resection is associated with a sig-nificant mortality rate following *** dietary consump-tion and an elevated metabolic rate within tumor cells contribute to the increased proba-bility of malnutrition associated with the ailment,consequently leading to a sub-stantial deterioration in *** studies,reinforce the importance of nu-tritional and immune-inflammatory *** to surgical intervention,geriatric nutritional risk and systemic immune-inflammatory indices should be prioritized,particularly in older patients with malignant diseases.

关键词： Systemic immune inflammation index Nutritional risk index Radical resection Liver cancer Prognosis Correlation

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Modeling Superhydrophobic Contact Angles and Wetting Transition

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Journal of Bionic engineering 2009年第4期6卷 335-340页

作者： Nan Gao, Yuying YanDBE, Faculty of engineering, university of Nottingham, NGl 2RD, uk DBE Faculty of Engineering University of Nottingham Nottingham UK

It is well known that surface roughness has a very important effect on *** Wenzel and Cassie-Baxter models,which correspond to the homogeneous and heterogeneous wetting respectively,are currently primary instructions for designing superhydrophobic ***,the particular drop shape that a drop exhibits might depend on how it is formed. A water drop can occupy multiple equilibrium states,which relate to different local minimal *** some cases,both equilibrium states can even co-exist on a same *** the apparent contact angles may vary and have different *** discuss how the Wenzel and Cassie-Baxter equations determine the homogeneous and heterogeneous wetting theoretically. Contact angle analysis on hierarchical surface structure and contact angle hysteresis has been put specific *** particular, we study the energy barrier of transition from Cassie-Baxter state to Wenzel state,based on existing achievement by previous researchers,to determine the possibility of the transition and how it can be *** has been demonstrated that surface roughness and geometry will influence the energy required for a drop to get into equilibrium,no matter it is homogeneous or heterogeneous wetting.

关键词： superhydrophobic surface contact angle wetting transition energy balance biomimetics

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Effect of Strain on the Electrical Resistance of Carbon Nanotube/Silicone Rubber Composites

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Journal of Wuhan university of Technology(Materials Science) 2011年第5期26卷 812-816页

作者：曾尤 school of Materials Science and engineering Shenyang Jianzhu University

Carbon nanotube （CNT） filled silicone rubber （SR） composites were synthesized by in situ *** effect of strain on the electrical resistance of the CNT/SR composites and the structure evolution of CNT networks during tensile deformation were *** results showed that the CNT/SR composites had high sensitivity of resistance-strain *** a wide strain range （0-125%）,the change of resistivity could reach 107,which was closely associated with the evolution process of the conductive CNT-network *** volume expansion of the composites in the tensile process led to a gradual decrease in the volume fraction of CNTs with the strain *** CNT loading was lower than the percolation threshold,CNT network was in disconnected state with a rapid increase in electrical resistance of the ***,the CNT loading had remarkable effect on the sensitivity of resistance-strain response in the composites.

关键词： carbon nanotubes silicone rubber composite resistance-strain response

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Electrically Conductive Concrete for Heating Using Steel Bars as Electrodes

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Journal of Wuhan university of Technology(Materials Science) 2010年第3期25卷 523-526页

作者：侯作富 school of Mechanical engineering Yangtze University

The steel bars with good electrical conductivity were used as two kinds of electrodes in the making of carbon fiber（CF） electrically conductive concrete for *** results of the pertinent experiments illustrate the design is *** change in electrical resistivity over three years＇ hydration time was studied when steel bars were used as lateral face electrodes and top bottom surface electrodes *** temperature rise test was conducted to verify the heating properties of two kinds of *** only the study can reduce the CF volume content of electrically conductive concrete for heating to 0.58% or 0.36% according to different design,but also it will enhance the carrying capacity of the concrete roadway for heating.

关键词： steel bar carbon fiber electrical resistivity temperature rise

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