检索结果-南通市图书馆

THE EVALUATION OF CHANGE IN CONCRETE STRENGTH DUE TO FABRIC FORMWORK

Journal of Green Building 2015年第2期10卷 113-133页

作者： Farhoud Delijani Mark West Dagmar Svecova dept.of Biosystems Engineering University of ManitobaWinnipegManitobaR3T 5V6 dept.of Architecture. University of ManitobaWinnipegManitobaR3T 2N2 dept.of civil Engineering University of ManitobaWinnipegManitobaR3T 5V6

Fabric,as a flexible formwork for concrete,gives builders,engineers,and architects the ability to form virtually any *** technique produces a superb concrete surface quality that requires no further touch up or *** polyolefin fabrics are recommended for this *** texture of this fabric allows water from concrete mix to bleed,and therefore reduces the water-cement ratio of the *** to the reduction in the water-cement ratio,a higher compressive strength in fabric-formed concrete is achieved,which is also suggested by earlier *** current research study was conducted to investigate and document the changes in concrete strength and overall quality due to these woven polyolefin *** of fabric formwork will result in a decrease in construction cost,construction waste,and greenhouse gas *** sets of tests were conducted in this research study:a comparison of the compressive strength of fabric-formed versus PVC-formed concrete cylinders,and a comparison of the behaviour of the fabric-formed columns versus cardboard-formed reinforced concrete *** in this research were limited to two types of fabric that included one with coarse and one with a more refined texture,and two types of concrete that included ordinary and flyash *** laboratory results revealed that the effects of fabric formwork on concrete quality in a large member are limited mostly to the surface zone and the core of the concrete remains the same as a conventionally formed *** though fabric-formed cylinder tests showed an average of a 15%increase in compressive strength of the concrete samples,the compressive strength of the reinforced columns did not dramatically change when compared to the companion cardboard formed control *** research confirmed that fabric formwork is a structurally safe alterna-tive for forming reinforced concrete columns.

关键词： concrete fabric formwork flexible formwork reinforced concrete column test

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effects of generally anisotropic crustal rocks on fault-induced displacement and strain fields

引用

Geodesy and Geodynamics 2019年第5期10卷 394-401页

作者： E.Pan W.A.Griffith H.Liu dept.of civil Engineering and dept.of Mathematics University of AkronUSA School of Earth Sciences The Ohio State UniversityUSA School of Transportation&Logistics Dalian University of TechnologyChina

We present a new solution for the elastic displacement and strain fields on or near Earth’s surface due to rectangular faults in an anisotropic half-space,expressed as a summation of(A)the solution in an infinite space which is singular,and(B)the complementary part which is regular and *** two solutions are expressed in terms of the mathematically elegant and computationally powerful Stroh formalism and can be applied to the generally anisotropic rock half-space or a transversely isotropic rock mass with any oriented plane of *** any flat fault of polygonal shape,one needs only to carry out a simple line integral from 0 to 7 r in order to express the fault-induced *** examples are presented to demonstrate the significant effect of the rock anisotropy and layer orientation on the fault-induced displacement and strain fields in anisotropic *** applications are wide ranging,from faults in sedimentary strata to strongly deformed metamorphic rocks with steeply dipping foliation.

关键词： Geomechanics Rock anisotropy Bedding plane Deformation and strain fields Mechanics,theory,and modelling

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Deviation of design air-conditioning load based on weather database of reference weather year and actual weather year

引用

Energy and Built Environment 2020年第4期1卷 417-422页

作者： Z.Jiao J.Yuan C.Farnham K.Emura dept.of Housing and Environmental Design Graduate School of Human Life ScienceOsaka City UniversityOsaka 558-8585Japan dept.of Architecture and civil Engineering Toyohashi University of Technology1-1 HibarigaokaTempaku-choToyohashiAichi 441-8580Japan

In Japan,in order to determine the capacity of air-conditioning equipment,designers usually use the weather database of Reference Weather Year(RWY)to obtain the design air-conditioning load by using software such as New HASP/ACLD and Building Energy Simulation Tool(BEST)that are often used in *** recent years,with the global warming due to climate change,the weather database used to calculate air conditioning load also ***,in order to determine an appropriate capacity of air-conditioning equipment for energy conservation of buildings,the deviation of design air-conditioning load calculated using the weather database of RWY and Actual Weather Year(AWY)should be *** this paper,New HASP/ACLD was used to calculate the building heat loads of eight major Japanese cities over 30 years(1981-2010)between RWY and *** heat load at an exceedance probability of 2.5%is defined as the design air-conditioning load in this *** the design air-conditioning load obtained from RWY and AWY,it is shown that it is not necessarily the most appropriate when using the RWY to calculate the design air-conditioning load,especially for heating load in ***,it is also shown that the annual heating load time ratio has decreased and the annual cooling load time ratio has increased over the 30 years.

关键词： Design air-conditioning load Annual air-conditioning load time ratio Reference weather year Actual weather year New HASP/ACLD

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Multi-objective variance control of structural vibration

引用

Journal of Harbin Institute of Technology(New Series) 2011年第3期18卷 139-143页

作者：宁响亮谭平刘红军周福霖 dept.of Urban and civil Engineering Harbin Institute of Technology(Shenzhen Graduate School) Earthquake Engineering Research and Test Center Guangzhou University

A procedure for the design of state feedback controller for seismic-excited structures is presented in this *** external exciting-controlled structure-control system was simulated using state space *** on the convex optimization technology and variance control theorem,the general expression of linear matrix inequalities (LMIs) for state feedback controller with closed-loop poles and the steady variance responses constrained were deduced,in which the poles and variance response of system were guaranteed to satisfy certain constraints assigned in *** Toolbox of MATALB was employed for optimizing the state feedback *** last,a three-story simple lumped mass shear model was used to demonstrate the effectiveness and superiority of the proposed method.

关键词： variance control convex optimization linear matrix inequality state feedback

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Seismic rehabilitation and analysis of Chaohe earth dam

引用

Earthquake Engineering and Engineering Vibration 2005年第2期4卷 265-273页

作者：付磊曾向武 Findling Inc.BaltimoreMD 21215USA GeotechnicalEngineer dept.of civil Engineering Case Western Reserve UniversityClevelandOH 44106USA Professor

Stability of earth dams during earthquakes has been a major concern for gcotechnical engineers in seismic active regions. Liquefaction induced slope failure occurred at the upstream slope of a major earth dam in the suburb of Beijing, China, during the 1976 Tangshan Earthquake. The gravelly soil with loose initial condition liquefied under relatively small ground vibration. In recent years, a major seismic rehabilitation project was carried out on a similar earth dam nearby using dumped quarry stone. Seismic stability analysis was carried out using model test, finite element simulation, and pseudostatic slope stability program after taking into account the influence of excess pore pressure.

关键词： earth dam rehabilitation stability analysis liquefaction riprap protection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of fuzzy optimal selection of similar slopes to the evaluation of slope stability

引用

Journal of Harbin Institute of Technology(New Series) 2007年第3期14卷 415-418页

作者：王旭华陈守煜唐列宪张厚全 .dept.of civil and Architectural Engineering Dalian University School of civil and Hydraul. Dalian Univ.of Technol. Center for Rock Burst and Induced Seismicity Research Northeastern University

The numerical calculation method is widely used in the evaluation of slope stability,but it cannot take the randomness and fuzziness into account that exist in rock and soil engineering *** fuzzy optimization theory is thus introduced to the evaluation of slope stability by this paper and a method of fuzzy optimal selection of similar slopes is put forward to analyze slope *** comparing the relative membership degrees that the evaluated object sample of slope is similar to the source samples of which the stabilities are detected clearly,the source sample with the maximal relative membership degree will be chosen as the best similar one to the object sample,and the stability of the object sample can be evaluated by that of the best similar source *** the process many uncertain influential factors are considered and characteristics and knowledge of the source samples are *** practical calculation indicates that it can achieve good results to evaluate slope stability by using this method.

关键词： fuzzy optimal selection of similar slopes relative membership degree object sample source sample

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A NEW METHOD FOR THE UNCERTAIN RESPONSE ANALYSIS OF STRUCTURES WITH UNCERTAIN PARAMETERS

引用

Acta Mechanica Solida Sinica 2003年第1期16卷 47-51页

作者： Xie Jun Sun Yan Guan Gang dept.of Engineering Mechanics Shanghai Jiaotong UniversityShanghai 200240China College of civil Engineering Zhengzhou UniversityZhengzhou 450002China

A computing method for estimating the upper and lower bounds of the response of structures with uncertainties is presented. The uncertain parameters are described by the convex model. A numerical example of the frame ... 详细信息

关键词： convex model structures with uncertainties upper and lower bounds of response

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FINITE-ELEMENT MODELLING OF SOIL-GEOGRID INTERACTION DEALING WITH THE PULLOUT BEHAVIOUR OF GEOGRIDS

引用

Acta Mechanica Sinica 1998年第4期14卷 371-373,375-382页

作者：闰澍旺冯守中 B.Barr dept.of Hydraulic Eng. Tianjin UniversityTianjin 300072China Div.of civil Eng. Cardiff School of EngineeringUniv.of WalesCardiffUK

To predict the behavior of geogrids embedded in sand under pullout loading conditions, the two dimensional plane-stress finite element model was presented. The interactions between soil and geogrid were simulated as non-linear springs, and the stiffness of the springs was determined from simple tests in the specially designed pullout box. The predicted behavior of the geogrid under pullout load agrees well with the observed data including the load-displacement properties, the displacement distribution along the longitudinal direction and the mobilization of the frictional and bearing resistance. (Edited author abstract) 8 Refs.

关键词： sand geogrid interaction two dimensional finite-element modelling plane-stress small pullout box pullout rig friction bearing resistance

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Seismic passive earth resistance using modified pseudo-dynamic method

引用

Earthquake Engineering and Engineering Vibration 2017年第2期16卷 263-274页

作者： Anindya Pain Deepankar Choudhury S. K. Bhattacharyya Academy of Scientific and Innovative Research(AcSIR) New Delhi 110001IndiaCSIR-Central Building Research InstituteRoorkee 247667India dept.of civil Engineering lndian Institute of Technology BombayPowaL Mumbai 400076lndiaAcademy of Scientific and Innovative Research(AcSIR)New Delhi 110001India dept.of civil Engineering Indian Institute of Technology KharagpurWest Bengal721302IndiaCSIR-Central Building Research InstituteRoorkee 247667India

In earthquake prone areas, understanding of the seismic passive earth resistance is very important for the design of different geotechnical earth retaining structures. In this study, the limit equilibrium method is used for estimation of critical seismic passive earth resistance for an inclined wall supporting horizontal cohesionless backfill. A composite failure surface is considered in the present analysis. Seismic forces are computed assuming the backfill soil as a viscoelastic material overlying a rigid stratum and the rigid stratum is subjected to a harmonic shaking. The present method satisfies the boundary conditions. The amplification of acceleration depends on the properties of the backfill soil and on the characteristics of the input motion. The acceleration distribution along the depth of the backfill is found to be nonlinear in nature. The present study shows that the horizontal and vertical acceleration distribution in the backfill soil is not always in-phase for the critical value of the seismic passive earth pressure coefficient. The effect of different parameters on the seismic passive earth pressure is studied in detail. A comparison of the present method with other theories is also presented, which shows the merits of the present study.

关键词： retaining wall earthquake limit equilibrium method modified pseudo-dynamic method passive earthpressure composite failure mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of rainfall intensity and slope gradient on the application of vetiver grass mulch in soil and water conservation

引用

International Journal of Sediment Research 2012年第2期27卷 168-177页

作者： Somchai DONJADEE Chaiyuth CHINNARASRI dept.of Irrigation Engineering Kasetsart Univ.Kampaeng Saen CampusNakorn Pathom 71340Thailand. Water Resources Engineering & Management Research Center(WAREE) Dept.of Civil EngineeringKing Mongkut's Univ.of Technology ThonburiBangkok 10140Thailand

The objective of this study is to investigate the effect of rainfall intensity and slope gradient on the performance of vetiver grass mulch(VGM) in soil and water *** study involved field experiments on 2m×10m plots with 2 slopes of 3%and 30%.Two rainfall intensities of 55 mm hrand 140 mm hrwere selected with a 1 hr for 2 year to 500 year return period.A set of artificial rainfall simulators was constructed and calibrated as part of the research *** dry matter quantities of VGM were used in the *** runoff volume per unit surface area decreased with an increase in the quantity of *** the 3%land slope,they varied from 5.6 to 13.4 mm and from 22.8 to 46.1 mm for rainfall intensities of 55 and 140 mm hr,*** the 30%land slope, they varied from 8.0 to 21.4 mm and from 29.4 to 59.6 mm for rainfall intensities of 55 and 140 mm hr,*** average soil losses were 0.32-2.85 kg mon the bare soil plots,and 0.07-1.80 kg mon the VGM *** VGM showed good potential for reducing runoff by 31.5-68.4%and soil loss by 33.7-82.4%,compared with the case without *** quantity of VGM equal to 0.75 kg mpresented the best performance in reducing runoff and soil loss.

关键词： Conservation Rainfall Runoff Soil erosion Vegetation

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：