Advanced Materials Research Vols. 243-249

Abstract: To determine stability performance and the critical load of the short cylinder vessel which is made of steel, this paper carried out the finite element linear buckling analysis for 5 meters long steel pressure vessel and obtained buckling critical load. Then performed the nonlinear instability analysis by the arc-length method and obtained the load-displacement curves of the overall stability of the pressure vessel structure. The critical load can be got by twice the elastic slope method and double-tangent intersection method, and the loads are slightly higher than the result of the theoretical calculation, so the result of the theoretical calculation is safe and reliable. Finally, several measures keeping stability of short cylinder pressure vessel are proposed.

Abstract: This paper considers the problem of locating sensors on the flexible structures with the aim of maximizing the data information so that structural dynamic behavior could be fully characterized. Since only translational degrees of freedoms (DOFs) are considered for possible sensor installation in the state-of-the-practice, a method which could avoid distinguishing the translational and rotational DOFs is presented. In order to realize the proposed method and to demonstrate its effectiveness, three different sensor placement techniques, EfI, EfI-DPR and Uniform, were employed to a super tall building. The calculation results showed that the proposed method is easy in understanding and could be used practically by civil engineers. EfI method provides a more effective method for optimal sensor placement than other ones to identify the vibration characteristics of the studied building.

Abstract: Based on the R.C. frame-bent structure in a large-scale thermal power plant’s main building, a 1/7 scale model has been tested by man-excitaiton to determine its’ dynamic properties. The former three frequencies and vibration modes of the model are obtained, and the dynamic property of the original structure is studied based on model similarity theory. At last, modal analysis of plane model and spatial model of prototype are discussed by using ANSYS FEA software, and the spatial dynamic preperty of the irregular structure is analyzed.

Abstract: The fire experiment was conducted for three of circular steel tubes protected with two different gypsum fireproof panel and the steel tube without any protective material. The fire response temperature of surface of steel tubes was measured and the axial compressive bearing capacity of the specimens after fire were tested and analyzed. The test results show that gypsum fireproof panel has better fire protection characteristics. It is noted that the variation of temperatures of inner surface of gypsum fireproof panel under fire is consistent with the temperature of outer surface of the steel tube. The maximum difference of temperature between the outer surface of the tube and the furnace space is 150°C as the fire keeps stable for the steel tube without any protection. It is concluded that two of the specimens protected with gypsum fireproof panel have larger post-fire capacity, which means that the gypsum fireproof panel has better effect on fireproof of the steel tube under fire.

Abstract: In order to study the fire behavior of the profiled sheet-ceramsite concrete composite floor subjected to fire load, research on fire response and post-fire bearing capacity of a profiled sheet-ceramsite concrete composite floor subjected to dead load, which has no shearing nails, is carried out here through experiment. Based on the experimental results, the fire behavior and post-fire bearing capacity of the floor after exposure to fire are analyzed. It is shown that the failure form of the profiled sheet-ceramsite concrete composite floor after exposure to fire has obvious change compared with the floor not subjected to fire load, but the composite floor subjected to fire still exhibits higher bending capacity, and the ultimate value of the equivalent distributed load is up to 35kN/m², which may be used as basis of strengthening and repairing of the profiled sheet-ceramsite concrete composite floor after exposure to fire.

Abstract: Major metropolitan transportation construction works usually employ underground tunneling methods and carry great risks. According to past experiences, the collapse of tunneling works always triggered a chain reaction of collateral damage and caused a considerable urban impact. Therefore, the damage control and restoration in the event of MRT tunneling failure have drawn great attention of researchers and industrial practitioners. This study used the tunnel collapse of the Kaohsiung MRT project as a research subject. The project was executed by a JV entity through an international joint venture between a Taiwanese and a Japanese construction firm. Conclusions are made based on the analysis of information collected from written documents and in-depth interviews with people involved in the remedial and restoration works. This study discusses the series of measures taken for the collapse event in question, and may serve as a reference to highlight the importance of disaster prevention for future.

Abstract: Accurately and quickly evaluate the damage of high-rise buildings can effectively reduce economic losses and speed up the reconstruction of the earthquake region. Based on monitoring data and numerical simulation, this paper proposed a method to evaluate the damage of high-rise structures suffered earthquakes. Taking a frame-tube structure as example, the method’s availability is verified. The results can coincide well with the experimental phenomenon and the fuzzy evaluation results based on the monitoring data. This method can accurately and effectively evaluate the general damage degree of high-rise structures post-earthquake.

Abstract: The supports of plate will be damaged under instantaneous impulsive loads. Dynamic issues of collision between a plate and its supports are equivalent to a problem of plate under uniformly distributed impulse. Based on thin plate theory, thick plate theory and infinite plate theory, dynamic responses of a plate under uniform impluses are analyzed. In the analysis, the effects of shear deformation and moment of intertia on dynamic behaviours of plate (frequence, flexibility and interal force etc) are respectively considered. The results indicated that the deflections calculated under thin plate theory are smaller than those of thick plate theory, and the internal force are much more smaller. Therefore, shear deformation and moment of inertia should must be taken into accounted for the correctly calculation. Besides, the different calculate results between infinite plate theory and thick theory shows that the infinite plate theory can be used for thick plate calculation when the length-width ratio is larger than 5 for the discrepancy of deflections and internal forces is very small on this condition.

Abstract: According to the 95 landslides of field investigation and literatures, the topographic types of landslide movement were divided into river, ladder and linearity. Based on the power-law relationship between the volume and equivalent friction coefficient of non-block landslides, the topographic influence coefficients were studied which were influenced by the landslide volumes and occurrence mechanisms. Because of different volumes of seismic landslides and rainfall landslides, the influence coefficients of topography were significant different. It indicated that the disaster-causing mechanism of landslides not only closely related with the landslide volume, but also were controlled by topographic types and occurrence mechanisms.

Abstract: The denseness of urban public buildings and the complication of the underground space spur the enhancement of disaster prevention and mitigation planning. As a result, for the urban public buildings around the densely populated area, the establishment of public buildings disaster prevention system in urban and the study on some related questions lay the basis of disaster prevention and mitigation. Since the concept of public building have the different definitions in the national standards and different types of buildings require different signs on disaster prevention, the category of public buildings has been redefined according to international normative standards. Furthermore, the research on the types, colors, sizes and position of disaster prevention signs has been done according to the internal, external of building and evacuation routes aspects. Finally, the basic functions of disaster prevention sign system in and around the buildings and the settings of the disaster prevention sign system of different types of public buildings are proposed.