Advanced Materials Research Vols. 1065-1069

Abstract: Concrete-Filled Steel Tube with high capacity, good ductility and toughness, convenient construction, good fire resistance and other advantages. Currently^[1] . Concrete-Filled Steel Tube structure has been widely used in the basic components and the overall structure of behavioral research has made many achievements. There are many advantages of concrete pipe above, but it also has fatal flaws, Stainless steel steel that is the difference^[2]. The stainless steel has a beautiful appearance, durability, corrosion resistance, low maintenance costs, good fire resistance and other advantages. New stainless steel pipe concrete structure has both ordinary steel concrete good mechanical properties and excellent durability of stainless steel, can be widely used in buildings and bridges of the marine environment as well as some of the high durability and aesthetic requirements important building structures. Based on the outer stainless steel hollow sandwich - the carbon steel pipe shaft of light pressure test concrete results of load and displacement of the structure, variation of load and strain, and the impact of the empty heart of these parameters.

Abstract: Based on the concrete plasticity damage model provide by the Abaqus, the subroutine PQ-fiber provided by the TsingHua University was used to build the model and simulation for the steel plate reinforced concrete (SPRC) coupling beams. The embedded column and steel plate stress nephogram, concrete stress nephogram and hysteresis curve which was get after the simulation and which were compared with the actual test, the simulation results can fit the actual test results better, which provide some userful reference for the numerical study for the steel plate reinforced concrete coupling beams.

Abstract: The fire resistance of concrete filled steel tubular column is usually obtained by the numerical analysis method, which is difficult to operate and not convenient in the actual civil engineering. So it is necessary to study the simplified calculation method. A large number of numerical simulation results of the temperature distribution of the section and the bearing capacity at high temperature of the concrete filled steel tubular columns are analyzed. The influences of secondary parameters are simplified. The simplified calculation method at 150 min and 180 min for the bearing capacity at high temperature of concrete filled steel tubular columns subjected to axial compression and fire is presented on the basis of comprehensive analysis of the numerical calculation results. The calculation results can be used as the basis to judge the fire resistance. It is shown by the comparison with the experimental results that the precision of the simplified calculation method can meet the requirements of engineering application.

Abstract: Based on the project of Foshan International Home Expo City, this paper studied the control measures of the synchronous lifting process control of large-span pre-stressed double-layer suspended cable roof, and summarized some key points, which could be used as the common reference for the similar projects.

Abstract: In order to understand the mechanical properties of barite concrete subjected to impact loading, use the drop-weight experiment according to the stress, strain and displacement to find out. The experiment is designed in two ways, using different qualities of drop hammers falls in the same height or using the same quality of drop hammers falls in different height. And know the failure process of barite concrete when the area of strain rate is 1.4s^-1~4s^-1, and making reference to the stress time-history curves, the strain time-history curves and the displacement time history curves, comes to the conclusion that in the case of other conditions remain unchanged the peak load, the loading rate and so on will increase if make the drop hammer heavier or higher.

Abstract: Hot-dip galvanized fasteners are key connecting components on power transmission towers and structures. In order to improve the installation code of galvanized fasteners, this paper establishes a three-layer (BP) neural network by using the friction coefficients between threads, nut bearing surface friction coefficients and the associated torque coefficients. In addition, the neural network is trained to predict the torque coefficients of fasteners. It can be seen from the research results that the torque coefficients fall within [0.355, 0.709]. Subsequently, the prediction capability of neural network is verified through tests and statistics upon real galvanized fasteners, proving that BP neural network is an effective model.

Abstract: Offshore wind turbine supporting structure long term works in the harsh marine environment, suffering from a variety of negative factors such as the seawater corrosion, marine growths, water scour, collision of sea ice and ship, etc.. Through numerical analysis software SACS and ANSYS, the marine environment impacts on the supporting structure and protective measures were put forward. The study found that such adverse environmental factors might easily result in a whole or partial component damage of the foundation support structure, and eventually lead to the reduction of security and durability. Reasonable preventive measures to ensure the security of the offshore wind turbine supporting structure were proposed and theoretical guidance for the design of future offshore foundation was provided.

Abstract: This paper proposes a new damage warning process for structural health monitoring (SHM) system, which utilizes probability analysis on information of frequency abnormal development. This process was introduced to analyze information collected in frequency domain from a steel structure, and it achieves damage warning for the structure.

Abstract: This paper presents a reinforcement design of five-story R/C structure with mild steel dampers in high seismic fortification intensity site. The details of the design process are listed in the paper, and the time history analyses under frequent and rare earthquake are performed on structure models with and without dampers. Through the comparison, the peak of maximum story drifts angles with damper-added structural is reduced by 38% and the distribution is more uniformly. The results show that energy-dissipation design with mild steel dampers can be a reliable and effective method in reducing seismic responses of reinforcement structure.

Abstract: Multi-storey RC-frame structure occupies a large proportion of the building structure in our country, the collapse of multi-storey frame structure in great earthquake is very serious, and it has become a major threat to people's life and property security, so research of the rule about structural collapse and define the critical state of structural collapse accurately is necessary. This paper focuses on the rule of structural collapse, takes constant stiffness multi-layer RC-frame structure as the object of study, with height, span and number of floors as the variables, uses nonlinear finite element software ANSYS/LS-DYNA, bases on elastic-plastic time history analysis, studies the rule of plastic deformation’s development of constant stiffness multi-layer RC-frame structure, and the relationship between story-drift and structural collapse.