Advanced Materials Research Vols. 374-377

Abstract: By reviewing Lanzhou urban green system planning development since 1949, this paper analyses the guiding principles, the dominant function and layout structure of urban green system planning construction in different time. Based on above analysis, these factors that influencing Lanzhou green system planning are researched. By using these results, the intrinsic movement and rule of urban green system planning construction are proposed. It gives a good case for reference of Lanzhou green system planning practice.

Abstract: It is essential to avoid or reduce construction errors when field connecting curved steel girders together with diaphragms. Construction errors usually change the mechanical system, create unexpected internal forces and residual stresses in steel girders or diaphragms, which cause construction difficulty of follow-up work and create safety issues. In this article, as a case in point, two inner supports of a curved two- steel girder pedestrian bridge were uplifted when two steel girders being tied together by the diaphragms. To continue upper concrete deck work, a temporarily added dead load at both ends of girder was applied. Through field investigation and based on mechanical reasoning, we detected the main cause of the uplift. Moreover, we built a finite element model to simulate the procedure of construction step by step and stresses of every step were obtained. In the meantime, displacements of the supports were monitored by laser measurement system while the added dead load was released. When the whole bridge construction was completed, a field loading test was taken, displacements and strains were measured. Compared the calculation result with the test data, we drew a conclusion that the installation error produced very low residual stress, and there is no effect to the structural safety under the full design load.

Abstract: The shear resistance at the interface between FRP sheet and concrete is a key problem for the application of fiber-reinforced plastic (FRP) plates, which has emerged as a popular method for the strengthening of reinforced concrete structures. The objective of this study is to discuss the interfacial shear ultimate bearing capacity of a high-strength concrete structure strengthened by carbon fiber-reinforced polymer composites under static loads. Considering the different strength of concretes, double-shear tests were conducted. Based on the test results, considering of the adhesive layer, explicit finite element is used for simulating the shear failure of CFRP-strengthened concrete, obtain the whole process of structure deformation development, describe the conformation and development of crack and the failure mode. The FE result coincides with the experimental result.

Abstract: The synergism of the row - ring beam has the important influence to the deep hole excavated for building foundation supports and protections structure's deformation and the internal force, this paper focuses on analysis of its mechanism and theoretical model. Combined with engineering practice, using FIAC simulation analysis the internal force of double piles whether under the grid condition of the ring beam's effect, draws some meaningful conclusions.

Abstract: Considering the characteristics of vision in different luminance levels and the errors of the visual angle restituting, this research obtains a series of simulant scenes and the quantity relations between the luminance of actual scenes and reappearance scenes in the low luminance and weak contrast environment. Finally, carrying the subjective evaluation of these scenes, it obtains the scope of luminance and the quantification relations among these stimulus by statistical analysis. This paper provides theoretical basis for scene simulation and evaluation, and obtain quantitative suggestions for corresponding standards. It has important theory significance and the practical value for landscape lighting planning and design.

Abstract: Isolation technology has been applied to bridges more than before, and soil-structure interaction on structural system is gradually attracted people's attention, but combine the two is also considered very few especially in the bridge. In this paper, we combine the two cases, and set up 3-D model by ANSYS, do comparative analysis in three cases. The first is no bearing and no soil-structure interaction, the second is with laminated rubber bearing but not considering the soil - structure interaction, and the last one is considering both laminated rubber bearing and soil - structure interaction. Ultimately it proves that soil - structure interaction on the structure does produce effects what can not be ignored.

Abstract: The forms of concrete attacked by sulfate include physical crystallization and chemical crystallization. That affects the durability of concrete as an important factor especially in China's coastal areas and the Northwest region. Similarity theory in concrete by sulfate corrosion can be used to build up the similar criteria, and similar to the process of model design.

Abstract: The back analysis principle and method for thermal conductivity of RCC is introduced in this paper, and a Jiang Ya RCC dam is cited as a building example , on the basis of prototype temperature data of dam, the mathematic model by Difference principle is founded, the thermal conductivity of RCC is obtained. The result is similar to the data which is received in the laboratory. The back analysis is proved credible. The back analysis for thermal conductivity, on the one hand, actual safety of the completed projects could be evaluated; on the other hand, the design and construction in progress may be optimized. the scientific foundation for optimizing the design and monitoring the running of dam is provided. And it is provided with some scientific value and practical significance.

Abstract: The premise that analyzing and studying the factors that effect university town ecological physical environment (UTEPE), UTEPE impact factors are the thermal environment, sound environment, light environment, eco-energy saving design. This paper establishes the evaluation method for UTEPE which is based on fuzzy math. We evaluate the quality of UTEPE comprehensively in this way. Renewable energy, nontraditional water source, green construction materials, water-saving appliances, energy-saving lamps, bicycle & public traffic system are very important for creating good quality physical environment in university town. In this paper, according to the impact factors of the UTEPE and using the fuzzy mathematical theory on evaluating the UTEPE comprehensively can reflect the real situation more objectively and accurately. The construction of model is simple and practical. Comprehensive evaluation utilizes the combination of the general public survey and expert evaluation, which benefits to reflect the democratic spirit. It also provides the reference to improve the UTEPE.

Abstract: To solve the problem of the funds supply and demand disorders in the construction project, the financing coordination decision system is established; the coordination development model is Introduced, joint action is researched between each subsystem, control factors of system is found, By calculating, the influencing factors which go against supply and demand balance are found . The conclusion drawn from the study are as follows:(1) Current construction project funds supply and demand relation imbalance seriously (2) Adopt corresponding measures, the state of capital supply and demand imbalances will be better;(3) Capital persistence, profitable and liquidity are the main factors which influence the relationship between capital supply and demand.