摘要:According to the investigations of urban barrier free facilities, there have been lots of progresses in constructions of barrier free in cities recently. But there are no systematic barrier free facilities in these cities, which would restrict the function and effect of urban barrier free facilities for the handicapped and the elder. This paper puts forward that there should be a development from the urban barrier free facilities to the urban barrier free environment. There are two parts in the barrier free environment,that is the hardy environment and soft environment. Finally,an in-series connection two-core model of barrier free environment has been designed and discussed.
摘要:Complex science is a new science flourishing in 70s of the 20th century. It is a huge integration of Natural and Social Sciences and is also a huge storm in the Thinking Science. Compared with Philosophy, Technique and Art, the Architecture lags behind them. But it is not the reason that the architects need not care about and absorb the mind of other reign. The architects can recognize the world in a systematic and comprehensive way from exercising their mind by learning complex science. The self-organization-critical theory and fractal-geometry in complex science is close and related to topography, city planning, space and shape of building. The revolution of design will be raised by artificial-intelligence; therefore, there will be a better future for our residential environment by our effort.
摘要:The city landscape lighting is an important strategy for cities to upgrade their fame and promote the development of traveling economy. The special regional character and space form of montane city along the river offer favorable conditions to create the lighting styles of landscape-garden mode,while it also brings new chlenge to landscape lighting designers. This paper discussed the concept of landscape lighting design in the regional and humanistic aspects, and has done the applied and academic analysis of lighting classification and light color delamination with the basic theory of photometry and colorimetry,also brought forward the new concept of the construction of three-dimensional city night view. In this paper, the scientific solution for the problems, which are often arisen in the process of landscape lighting design of montane city along the river,was put forward so to prevent the negative effect brought by the had designing vogue of rote, mimic slavishly etc. This paper centers on the green-lighting and emphasizes the combination of technology and art;it also provides the applied and theory foundation to the creation of unique styles of landscape lighting of montane city along the river.
摘要:Based on the reversed cyclic loading tests of 21 nearly full-size interior joints in completed reinforced concrete frames,the law of bond deterioration of beam bars crossing the joint is tested and analyzed,which is influenced by the axial load ratio,shear-compression ratio,reinforced bar strength,concrete strength and the relative length of beam bars crossing the joint. By the nonlinear fitting method, the formula of the bond stress r between steel crossing interior joints and concrete under different loading step is obtained. According to the loading approach, the propositional formula of the relative length of beam bars crossing the joint hc/d is presented, which is influenced by axial load ratio, shear-compression ratio ,reinforced bar strength and concrete strength.
摘要:Seven reinforced concrete Beam-Column sandwich joint specimens were tested under cyclic load. The performances of these specimens consisting of loads resistance, deflection, ductility, displacement, energy dissipation could satisfy the requirement of structures for seismic design. The phenomena that concrete in joint region was crushed by axial load or eccentric load were never observed,and final failure for a multitude of specimens occurred by shear force. Though a few of performances such as beam bar anchorage capacity were not as well as those of traditional joints ,it is feasible for sandwich joints used while establishing structures.
摘要:In order to ensure the construction quality of the massive prestressed transform beam, to prevent and control the cracking before tensioning ,the technology of casting ,methods of temperature and crack controlling are carefully analysed and theoretical calculation is carried out as well as the temperature inspection during construction ,all of which have effective results. Some prestressed construction points of transform beam are also introduced in this article, and reference advices are given at last.
摘要:The secondary moment of prestressed concrete frame is different from that of continuous beam. In this paper,the principle and calculation method of equivalent load secondary moment and axial secondary moment are discussed,and the infection of secondary moment in moment modulation is analyzed,together with the suggestions of moment modulation for prestressed concrete frame with adopting the total control. The suggestions would be able to distinguish the advantageous and disadvantageous effect of secondary moment. Some helpful advises for moment modulation design are given in this paper.
摘要:There were often happened cases for beam elements with initial stress or initial strain while the geometrically nonlinear analysis was performed for the plane structure. The deduction of stiffness matrices was awfully difficult because the nonlinear stiffness matrices included node displacement vectors and extensive matrix operations. Based on the nonlinear geometric equation of plane beam element and general elastic relationship of stress-strain including initial stress and initial strain,the tangent stiffness matrix was derived. All explicit formula of stiffness matrices including initial stress and strain item have been developed by use of the MATLAB Mathematical Tools. The results are of great significance to the nonlinear finite element programming for plane beam elements.
摘要:The stability of rock-mass slopes is a very complicated system which is controlled by lots of factors. It is always a very important research subject to evaluate the slope stability reasonably through some evaluation methods. Based on matter-element theory and dependent function,the extension theory is applied to evaluate the stability of rock mass slope,and the extension method for the stability of rock mass slopes is proposed. Taking a real slope project for example,based on the reasonable selection of evaluation factors of slope stability,an extension model for evaluation of slope stability is built,whose result is contrasted with the fuzzy evaluating one. As a result, it is practical and feasible to apply the extension method to estimate the rock slope stability.
摘要:In this paper,on basis of Mises yield condition, the plastic limit load of annular plate with simply support under uniformly distributing load is evaluated. Because of the nonlinearity of the Mises yield condition, the weighted residual method is employed to gain the results. A simple formula for calculating the plastic limit load has been worked out. Compared with the results based on maximum moment condition,the numerical results in this paper are reasonable.
摘要:According to the code and technical regulation,an irregular RC frame with specially shaped columns has been designed,which situated at the area of fortification intensity 8. Subsequently,the nonlinear dynamic analysis has been carried out for the structure by inputting ground motions in two directions. After summing up the calculation results,this paper has examined seismic performance of the structure under the rare seismic actions and given a primary evaluation on the structure to see if it could achieve the predetermined anti-seismic aims. It indicates that the structure designed according to the codes can achieve the predetermined anti-seismic aim under the rare earthquake.
摘要:In this paper, according to the study on a great number of experiments and data analyses, the sedimentation rule of solid particles in debris flow is set up. Three main factors that influence the particle sedimentation in debris flow were studied; the basic reasons to influence the particle sedimentation were analyzed. The particle sedimentation in debris flow could be divided into three stages,i, e. the starting stage, the quick sedimentation stage and the accumulation stage,and detailed analysis on the sedimentation process each stage was made. The liquid viscosity, particle quality and additional water pressure have an important role on the sedimentation rule of the particle in debris flow.
摘要:The treatment technology of black water and nightsoil were reviewed in this paper. In order to referencing treatment techniques for nightsoil,more emphases were put on the progress of treatment modes,treatment processes and performances. Differences of the processes in America,Japan and some developing countries were pointed out. A new treatment technology of black water and nightsoil by the method of anaerobic-aerobic-flocculation-activated carbon was put forward.
摘要:The effect of fiber in asphalt mixtures has attracted general concern. For study of this problem, four kinds of fibers are chosen in this test. Asphalt and modified asphalt are adopted in asphalt mixtures AC-16I. The road performance influenced by additional fiber was analyzed impersonally,i, e. the stability of asphalt concrete under high temperature condition, anti-crack ability under low temperature condition, the water resistance and fatigue performance. It was shown through the research that the optimum asphalt content, air void rate, clearance rate of the mineral powder, saturation degree, and the flow value were increased and the density was decreased after adding the fiber. The road performance, such as the stability of asphalt concrete under high temperature condition, anti-crack ability under low temperature condition, water resistance and fatigue performance, was obviously improved,and the high temperature stability and fatigue performance improved most evidently. The fiber asphalt mixture performance reached and even exceeded the modified asphalt mixture performance. The modified asphalt performance after adding fiber would be improved more greatly.
摘要:Along with the increase in the number of large-scale construction projects, a series of negative effects concerning various interest-related parts have emerged,which urges a comprehensive and objective evaluation of construction project so as to evaluate its overall satisfaction. In this paper,an evaluation indexes system of construction project satisfaction was advanced,which consists of 19 values coming from all main interest concerning parties, including users, investors, owners, suppliers, government and organizations nearby. A BP neural network evaluation model was built which was self-adaptive, self-organizing and self-study. And this evaluation model was applied to specific project ease. The result showed that this approach can improve the reliability and effectiveness of satisfaction evaluation of the construction project.
摘要:With the progress of technology and development of the society, higher and higher uncertainty inside and outside the project makes the management facing a big challenge. From the systemic meanings of harmony, this paper discusses the philosophical status of harmony in the project management,introduces the harmonious management theory,and then points out that the harmonious management is the methodology through whole cognitive levels. It then brings forward a harmonious model of the project management. At the end,this paper explores a new research route of the modern project management at the visual angle of the harmonious management theory.
摘要:Rubbish of landfill is the resource put down at the incorrect place. In case of taking unfit measure, there will be not only the waste of available resource, but also leading to secondary pollution and losing the initial meaning of sanitary landfill. This paper discusses three usually occurred secondary pollutions in sanitary landfill,namely the water pollution,air pollution and soil pollution. Then it gives a series of advices,measures and reclamation of solid wastes. It pays more attention to the method of preventing leachate leaklng,the design and material for the impervious layer and the leachate collecting and so on. Then it introduces the technology of rubbish disposing and its new tendency in the future.