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超长混凝土墙体温度应力计算及裂缝控制新技术研究

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土木工程学报 2011年第9期44卷 35-41页

作者：焦彬如吴彦陈黎明郭昌生浙江大学宁波理工学院浙江宁波315100 中国恩菲工程技术有限公司浙江宁波315024 宁波建工集团有限公司浙江宁波315040

长期以来围绕超长墙体裂缝控制,普遍应用的有三种技术措施,但时至今日墙体混凝土仍然普遍开裂,仍无有效对策。由此,首先分析了现行的几种技术措施应用的现状和存在问题,侧重结合具体试点工程,对超长墙体的温度应力及裂缝分布产生的机理... 详细信息

长期以来围绕超长墙体裂缝控制,普遍应用的有三种技术措施,但时至今日墙体混凝土仍然普遍开裂,仍无有效对策。由此,首先分析了现行的几种技术措施应用的现状和存在问题,侧重结合具体试点工程,对超长墙体的温度应力及裂缝分布产生的机理进行较为深入的计算分析,从中得到新启示,并澄清了长期来工程界对预应力在墙体混凝土内作用较大的误解。在此基础上,通过必要的检测和温度应力计算分析的论述,提出简便易行和实用经济的裂缝控制新技术措施。此项新技术已初步得到了某大型工程的成功应用。

关键词：超长混凝土墙体裂缝控制墙体温度应力新技术措施

Analysis on co.esive crack opening displacement co.sidering the strain softening effect

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Science china(Physics,Mechanics & Astronomy) 2006年第1期49卷 88-101页

作者： WANG Limin1, XU Shilang2 & ZHAO Xiqiang3 1. Mechanics Department, Shandong University of Technology, Zibo 255049, china 2. Civil engineering Department, Dalian University of Technology, Dalian 116024, china 3. Mathematics Department, Ocean University of china, Qingdao 266071, china Mechanics Department Shandong University of Technology Zibo China Civil engineering Department Dalian University of Technology Dalian China Mathematics Department Ocean University of China Qingdao China

In order to investigate the crack propagation in quasi-brittle materials like rock, ceramic and co.crete, Hillerborg and his co.researchers abstracted the fracture process zone in front of a stress free crack in terms of a “fictitious crack zone”. On the fictitious crack zone, co.esive stresses distribute following a given softening relationship of stress vs. crack opening. Based on the polynomial or power series expression of co.esive crack opening displacement, the relationship of the co.esive stress vs. the crack opening displacement is established using elastic theory and integral equation, and some unknown physics variables are obtained using variation approach. The calculation results gained in this paper are close to the experimentally test ones.

关键词： co.esive crack, softening, dissipation work, variation approach.

An integrated turbocharger design approach to improve engine performance

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Science china(Technological Sciences) 2010年第1期53卷 69-74页

作者： ZHANG YangJun1,CHEN Tao1,ZHUGE WeiLin1,ZHANG ShuYong2 & XU JianZhong3 1 State Key Laboratory of Automotive Safety and Energy,Tsinghua University,beijing 100084,china 2 National Key Laboratory of Diesel Engine Turbocharging Technology,P.O.B.22,Datong 037036,china 3 Institute of engineering Thermophysics,Chinese Academy of Sciences,beijing 100190,china State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China National Key Laboratory of Diesel Engine Turbocharging Technology Datong China Institute of engineering Thermophysics Chinese Academy of Sciences Beijing China

Turbocharging technology is today co.sidered as a promising way for internal co.bustion engine energy saving and co. *** design is a major challenge for turbocharged engine performance *** turbocharger designer must draw upon the information of engine operation co.ditions,and an appropriate link between the engine requirements and design features must be carefully developed to generate the most suitable design *** objective of this research is to develop a turbocharger design approach for better turbocharger matching to an internal co.bustion *** development of the approach is based on the co.cept of turbocharger design and interaction links between engine cycle requirements and design parameter values.A turbocharger through flow model is then used to generate the design *** integrated method has been applied with success to a gasoline engine turbocharger assembly.

关键词： turbocharger design internal co.bustion engine integrated method through flow model

Application of the Technology of co.version Frequency to Polyester Production Line of Shengyuan in Zhejiang

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Application of the Technology of Conversion Frequency to Pol...

Preparation, characterization and salt-resistance of a co.l based super absorbent co.posite

2011 Chinese co.trol and Decision co.ference（CCDC）

作者： Jixiang Han is with the Sinosteel Equipment & engineering co.,ltd.,china Rongan Zhang is with the beijing Aritime Intelligent co.trol co.,ltd.,china Yong Ye is with the Zhejiang Shengyuan Chemical Fibre co.,ltd.,china

This paper introduces to an example applied the technology of the co.version frequency to the polyester production line of Shengyuan in Zhejiang successfully,and discusses the particular application and using effect of inverter technology to the co.trol process of production technology in the polymerization,mixing and in the parameter co.trolling such as speed volume and current *** paper describes the application of co.version frequency to driving system on the polyester production *** domestic-made frequency co.verter driving system has taken the place of imported one entirely,strengthened the ability to manufacture the equipment and installation autonomously,and reduced the co.ts of the equipment greatly.

关键词： The velocity modulation of co.version frequency polyester production line co.trolled driving

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Mining Science and Technology 2010年第6期20卷 864-871页

作者： CHU Mo, HUANG Zhanbin, XU Bang, FANG Tao, DUAN Hui School of Chemical and Environmental engineering, china University of Mining & Technology, beijing 100083, china School of Chemical and Environmental engineering China University of Mining & Technology Beijing 100083 China

Potassium humate was extracted from brown co.l. A novel super absorbent co.posite, poly （acrylic acid-co.acryla- mide）/potassium humate （PAA-AM/KHA）, was prepared by graft polymerization of acrylic acid, acrylamide and co.l based potassium humate using N, N＇-methylenebisacrylamide as a crosslinker and potassium peroxydisulfate as an initiator. The effects of reaction temperature, degree of neutralization of the poly （acrylic acid） and the amounts of crosslinker, initiator and potassium humate were investigated. Salt resistance tests were also carded out. The co.posite prepared under optimal co.ditions had a potassium bumate co.tent of 10% and exhibited a water absorption of 770 g/g in distilled water, and 349, 286 and 41 gig in 0.5 mol/L KC1, MgC12 and A1CI3 solutions respectively. The results indicate that the salt resistance of PAA-AM/KHA was superior to that of poly （acrylic acid-co.acrylamide） because of the co.laborative effect of functional groups of the co.l based potassium humate. The PAA-AM/KHA micro powder was characterized by IR spectrosco.y and the micrographic surface was characterized by scanning electron microsco.y. Introduction of potassium humate into the poly （acrylic acid-co.acrylamide） structure creates a co.posite more suitable for use as a water-managing material in the renewal of arid and desert environments. The salt resisting property of the co.posite is improved, production co.ts are reduced and the growth stimulant effect is still present.

关键词： brown co.l co.l based potassium humate superabsorbent salt-resistant property

Power allocation scheme for selfish co.perative co.munications based on game theory and particle swarm optimizer

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Science china(Information Sciences) 2010年第9期53卷 1908-1912页

作者： ZHANG GuoPeng1*,YANG Kun2 & DING EnJie3 1School of co.puter Science and Technology,china University of Mining and Technology,Xuzhou 221116,china 2School of co.puter Science and Electronic engineering,University of Essex Wivenhoe Park,co.chester co.4 3SQ,UK 3School of Information and Electrical engineering,china University of Mining and Technology,Xuzhou 221116,china School of co.puter Science and Technology China University of Mining and Technology Xuzhou China School of co.puter Science and Electronic engineering University of Essex Wivenhoe Park Colchester UK School of Information and Electrical engineering China University of Mining and Technology Xuzhou China

In co.mercial networks,autonomous user nodes operating on batteries are assumed to be selfish to co.sume their energy solely to maximize their own benefits,e.g.,data *** this letter a two-user co.perative game is proposed to perform the power allocation for selfish co.perative co.munication *** the game,one selfish user node co.ld trade its transmission power for the other ones co.perative relaying directly,and both user nodes are willing to achieve an optimal data-rate increase through co.perative *** find the Nash bargaining solution(NBS) of the game,a low-co.plexity numerical particle swarm optimizer(PSO) algorithm is also *** results indicate that the NBS of the game is efficient,in that both users co.ld experience better performance than they work independently,and fair,in that the degree of co.peration of a user node only depends on how much co.tribution its partner can make to improve its own performance.

关键词： co.perative co.munication power allocation game theory Nash bargaining solution particle swarm optimizer

Eco.Dyeing and Finishing Technology

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印染 2002年第S1期 76-77页

作者： By Shang Songmin, Fong’s National engineering (Shenzhen) co. , ltd.

1IntroductionThe overflow dyeing machine and thestenter are widely applied in textiledyeing and finishing *** overflow dyeing machineco.sumes large quantity of water andchemicals that results in the large output of *** belongs tothe high energy co.suming finishing e-quipment and the energy co.sumptionof the co.ventional stemter is enormous.

关键词： Eco.ogyEnvironmental protection Overflow dyeing machine Stenter

Slag co.rosion Resistance of MgO-ZrO_2 Refractories

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china's Refractories 2012年第1期21卷 17-21页

作者： YUAN Lin1,CHEN Songlin1,2,ZENG Luju1,LIU Xijun1,WU Xingsheng1,SUN Jialin2 1 Ruitai Materials Technology co. ltd. ,china Building Materials Academy,beijing 100024,china 2 School of Materials Science and engineering,University of Science and Technology beijing, beijing 100083.china Ruitai Materials Technology co. ltd. China Building Materials Academy Beijing 100024 China School of Materials Science and engineering University of Science and Technology Beijing Beijing 100083 China

Slag co.rosion resistance of MgO -ZrO2 refractories was inrestigated ill this work. The resuhs indicate that in a non-oriented electric steel slag systenl with a high ratio of ealci^t to silica, the slag resistance of MgO - ZrO, refractories can be described as flllows ： ZrO2 reacts with GtO .forming calcium zireonate co.pound which strengthens the material and blocks the channel of the slag infihration ; however, in an oriented electric steel slag system with a high co.centration of silica and the low ratio of calcia to silica, the slag co.rosion resistance ofM gO-ZrO： refractories is different ; ZrO2 reaets with CaO forming the ealcium zirco.ate and simultaneously one more product C2S as well; C2S cam improve co.ro- sion resistance by blinding pore and enhancing slag visco.ity; therefore, it is expected to be the major reason for the enham＇ed co.rosion resistance observed for MgO-ZrO2 refractories.

关键词： co.rosion resistatlce mechanism magne-sia-zirco.ia brick : RH degasser

An elastic-plastic analysis of short-leg shear wall structures during earthquakes

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Earthquake engineering and engineering Vibration 2012年第4期11卷 525-540页

作者： Ding Jianguo Zhu Ying School of Sciences Nanjing University of Science and Technology Huaxin co.sulting co. Ltd

Short-leg shear wall structures are a new form of building structure that co.bine the merits of both frame and shear wall structures. Its architectural features, structure bearing and engineering co.t are reasonable. To analyze the elastic-plastic response of a short-leg shear wall structure during an earthquake, this study modified the multiple-vertical-rod element model of the shear wall, co.sidered the shear lag effect and proposed a multiple-vertical-rod element co.pling beam model with a new local stiffness domain. Based on the principle of minimum potential energy and the variational principle, the stiffness matrixes of a short-leg shear wall and a co.pling beam are derived in this study. Furthermore, the bending shear co.relation for the analysis of different parameters to describe the structure, such as the beam height to span ratio, short-leg shear wall height to thickness ratio, and steel ratio are introduced. The results show that the height to span ratio directly affects the structural integrity; and the short-leg shear wall height to thickness ratio should be limited to a range of approximately 6.0 to 7.0. The design of short-leg shear walls should be in acco.dance with the ＂strong wall and weak beam＂ principle.

关键词： short-leg shear wall multiple-vertical-rod element model shear lag effect bending shear co.relationco.fficient co.pling beam stiffness matrix elastic-plastic analysis