Advanced Materials Research Vols. 639-640

Abstract: To prevent the damages of the moored ship and the wharf structures in heavy weather, the ship motion and its effects on the wharf are analyzed. The moored ship motion in high winds with big waves was investigated. Firstly, the lateral wind loads and wave loads were considered as periodic impulsive forces, and the simplified dynamical model was presented. Based on the presented nonlinear impulsive differential system model, the numerical simulations and analysis were performed. The effects of recovery coefficient, damping and stiffness parameters on the system behaviors were discussed. Finally, some suggestions were made to guarantee the ship's stability or practical stability in heavy weather, and the safety of the wharf structures is thus assured.

Abstract: A computerized method is presented for computing the dynamic responses of bridges under moving vehicles. The bridge and vehicle are treated as integrated system and modal superposition method is applied to transfer the equation of motion into modal coordinate system. The road roughness/unevenness is also considered. The effects of different vehicle models, vehicle passing speed and road surface roughness on bridge dynamic responses are studied. The impact factor representing the dynamic effect of passing vehicle is calculated for different road surface roughness

Abstract: From the discussion of the importance of the low carbon construction technology in China, the low carbon construction techniques are summarized in this paper, and especially the main low carbon construction techniques have been analyzed theoretically, then its application foundation and feasibility have been made clear. Through the case analysis, the actual effects of the low carbon construction technology have been grasped, so the related to issues of development optimization have been put forward, in the end can provide the reliable basis of promotion for low carbon construction techniques.

Abstract: Considering the characteristics of hydropower cascade development project’s cumulative environment impacts, such as scope broad, many indexes and so on, a new evaluation method- dynamic multi-objective decision method is adopted. This method makes alternative ranking under three-dimensional coordinate, then assessing the cumulative environment impact and its developing trends. The result indicates that this method can not only observes the cumulative impact’s changing degree in the past time, but also predict the changing trends in future time. It is able to comprehensively evaluate the cumulative environment impact.

Abstract: The paper starts from the discrimination of the proposition that the distribution of quality benefit is the key factor that affects the quality of participant in project organization, construct owner-construction side game model, gets the conceptual model and solution of participant’s quality action choice, best allocation scheme of quality and efficiency and advised best allocation scheme of quality and efficiency and points out the importance of quality reputation incentives and the way to achieve it.

Abstract: First of all, the paper introduces the concept of "field" in physics, constructs conceptual model and structural model of "dynamic field "to illustrate the role of evolution dynamic played to the participants in a project organization. On this basis, it constructs the field force function model of dynamic field, analyzing the field force after the dynamic factors coupled, and finally puts forward the working methods of the "dynamic field" of an organization and the conditions that the "dynamic field" of an organization can work better .

Abstract: The concrete frame with bottom frame structure bear the load from the upper floors, roofing and brick walls, internal force is quite large, so the designed section size of frame beams is big, sometimes even the clear height of the building can't meet the architectural requirements; And more reinforcement, construction of concrete are difficult to pound, even vibration bar are difficult to insert into the beam, seriously influence the construction quality of reinforced concrete and the frame structure quality can't t be assured. This article introduces the design and application of steel fiber reinforced concrete in the bottom frame through the practical engineering examples. Steel fiber concrete can enhance the tensile and shear strength, and make it has good resistance to crack and toughness. As a result of the steel fiber concrete, the bearing capacity of bottom frame is greatly improved, and the problem in the project is solved.

Abstract: With continuous development of the structural engineering, a perfect theoretical foundation and construction means is the key to its development. Combined with characteristics of the curved beam, it will be closely integrated together with external prestressing technology. The associated design and construction research can be carried out, in order to fully meet the need of the prestressing development. In this paper, the advantages of external prestressing curved beam was studied, and relevant contents are as follows: reasonable adjustment of external prestressing tendon’s diameter makes the structural force to become more uniform and prevents inappropriate use to tendon; reasonable external prestressing tendon and anchorage is the premise of good structure connection. The crucial problems should to be solved are the lower anchor position and stress concentration treatment. Considering the security need of prestressing curved beam’s tendon connection, attention should be paid not only to its materials and mechanical properties, but also to the convenience of construction. The external reinforcement work of prestressing curved beam is to ensure reasonable control parameters, as well as to ensure the optimal design of reinforced construction. As for the technical grasp on the theory and construction of external prestressing curved beam structure, it will make them have broader development space.

Abstract: Using the finite element software ANSYS to analyze dynamic characteristics of external prestressing structure, reasonable control parameter, as well as external prestressing reinforcement joints of security, the main research contents and results are as follows: Dynamic performance analysis is about variation law and internal feature. With the increase of external prestressing, on the contrary, the natural vibration frequency will reduce. However, external prestressing effects on the structural dynamic performance improvement that is not obvious in general. Based on sensitivity analysis, control parameter of external prestressing reinforcement curved beam must be analyzed and the reasonable value range of sensitive control parameter can be found. For the control parameter of external prestressing process, its reasonable control parameter’s range should be about 6% in the theoretical calculation. While simulating of anchoring system, local force on anchoring system must be analyzed finely and accurately. A comprehensive understanding should be mastered on variation law, which is about the internal forcing and stress response of special area. The setting of anchoring device shall be arranged at 1/3 place of original prestressing position. To ensure the safety, it should guarantee the mechanical continuity of anchor joints.

Abstract: According to a construction case of residential buildings in Ningbo, this paper describes the technology performance, construction technology and innovation of the GMT template. Comparison with other common template, it has proved that this new building template has the advantages of smooth surface, easy remolding, light weight, good corrosion resistance, formwork turnover frequency and recyclable. So it has a good application value.