Advanced Materials Research Vols. 243-249

Abstract: Wave-induced circular shearing failure of submarine slopes could be found at big estuaries all over the world. For this kind of failure form, the equations for Critical failure conditions and scale were created based on limit analysis method. The results were compared with those from elastic calculation, flume test and in situ measurement, which show that there are some coincidences between them.

Abstract: Based on A.W.Bishop Method and Monte Carlo Method (MCM), slope structural reliability has been researched in this paper. These random variables include unit weight γ, internal friction angle φ and cohesion c of soil. The calculation result shows that the influence correlates to the contribution of random variable to skid resistance of slope structure, namely, the fluctuation of variable with great contribution can give great influence to safety factor K and failure probability P_f, and vice versa. Moreover, P_f is more sensitive to variable φ than to γ and c. In addition, if the fluctuation of above three variables has been considered simultaneously, the influence to P_f is sensitive when their fluctuation is within narrow range, but the influence is mainly controlled by variable φ when their fluctuation is within large range and this influence is nearly the result based on variable φ alone. This shows that internal friction angle φ plays the important role in slope structural reliability and shouldn’t be neglected.

Abstract: Since the "Fujian Earth Building" was on the list of the world heritage list, the protecting work of Earth Building gets more and more important. This paper adopts the method combining wind tunnel test and numerical simulation, using CFD software to establish the representative building model of round monolayer Earth Building and get the wind load characteristics in different wind direction. And the wind tunnel tests confirmed the reliability of simulated results. The results provide reference to the protection and wind-resistant design for Earth Building and modern building of Earth Building mode.

Abstract: In this paper, a series of inelastic transient analysis of steel frame structures under blast loads are numerically performed. Considering the coupling actions of detonator, gases and structure, Arbitrary Lagrangian Eulerian ALE method which is suitable for large deformation systems is applied. In order to capture the effect of explosion load on members, a rate-dependent stress–strain model is used to model the material response of the affected members. The dynamic response and the structural damage of steel frame under blast loading are investigated. The damage pattern of steel frame to blast loads is studied. The results show that the permanent deformation, local buckling, and plastification reduce the resistance of the frame. The affected members may trigger the overall stability of the frame. The damage degree is related to the amount and position of explosives, shape and resistance of the building etc. The damage of the low-story columns and beams may make the structure unstable. The load might not be large enough, the damage to the entire frame may be severe, and it may cause structure collapse.

Abstract: Through the Quasi-Static test on two specimens of CFRST frame (KJ)and two specimens of CFRST frame with filler walls(TKJ) in horizontal load, the paper analyses the hysteretic curves of two structures contrastively, ductility, strength and stiffness degradation, consumption energy capacity, failure mechanism and failure characteristics, and also analyses the influence of various parameters on the seismic performance and the mechanical properties. The results show that the filler walls increase the stiffness of the structure, and especially in the early loading it is more significant. It is obvious to reduce the p-Δ effect of the column at the normal using stage. The deformability of frame without filler wall is greater than that of frame with filler wall. But the damage process of frame with filler wall is a flat curve, and it meets the demand of ductile frame. Through the hysteretic curve we can know that the dissipative energy capacity of frame without filler wall is good in contrast with that of frame with filler wall. Then the ductility factor of CFRST frame with filler wall is greater than that of RC frame with filler wall. So we can conclude that the CFRST frame has wonderful superiority on bearing capability, seismic behavior and effective use of material.

Abstract: The mechanical behavior research on double tower connected structure under earthquake action is more and more important gradually with wide application of high-rise building connected structures in the engineering field. Structure stress and deformation become extremely complicated due to connected structure, thereby the paper adopts two kinds of different analysis software for simulation of simplified model and system comparative analysis on a project example of one double tower connected structure, single tower separate calculation and double tower connected integral calculation are respectively conducted, structure dynamic features under the earthquake action is comparatively analyzed, the influence of connected structure on tower integral structure vibration mode, displacement and period is analyzed, thereby obtaining some conclusions beneficial for project design as references.

Abstract: The simplified calculation method of the temperature field of concrete filled steel tubular columns under fire conditions was studied for convenience. Firstly, a numerical program of finite difference method was developed to calculate the temperature field of concrete filled steel tubular columns subjected to fire, and the calculation results of the program have good agreement with the experimental results. Secondly, the effects of the steel tube thickness, the steel tube diameter and the type of concrete aggregate were analyzed on the base of plentiful experimental and numerical results. Finally, the effects of some major factors on the temperature field were simplified, and the simplified calculation method was presented to calculate the temperature field of concrete filled steel tubular columns based on data fitting. The precision of the simplified calculation method can satisfy the accuracy requirement of engineering practices.

Abstract: In this paper, Hefei TV Tower is used as an analytical case to examine the Hybrid control method on seismic response. Firstly, on the basis of the other’s work, a bi-model dynamic model is proposed to study the seismic response vibration hybrid control, using tuned mass damper and viscous fluid dampers. Then the optimal coefficient is obtained by considered the seismic response of upper turret as optimization objectives. According to analysis, it’s showed that the seismic responses of the tower are decreased greatly with tuned mass damper and viscous fluid dampers, and the vibration reduction effectiveness of the tower is sensitive to the spectral characteristics of earthquake wave.

Abstract: The study analysis the disaster risk using the asset management database of Ching Yun University. The study proposed the risk factors of calculation and process in different disaster. Disaster of highest frequency in history of Ching Yun University is fire disaster and artificial mistake. The risk value was been calculated from the facilities and personnel on each floor. The risk analysis results show that the badly need of improvement floors is 3F, 6F and 8F. There is the highest risk value of personnel and facilities in 3F. This study proposes four improving options to reduce the casualties of the two dangerous situations occurrence. The analysis method of risk assessment used in this study is suitable for the general building to use to plan escape routes but the database should be set first.

Abstract: As a result of adopting isolated bearings, it is inevitable to increase the lateral displacement of the superstructure and the chance of girder falling. However, the shear keys that just satisfies the structural design is far from meeting the requirements of displacement of isolated bridge restrictions. On account of this, given the nonlinear characteristics of bearings and the restrainer, the authors make the study on the "damping rubber with coupling collar" restrainer, and then establish isolation system model of continuous beam bridge with finite element software named Midas. Meanwhile, the effect of the restrainer on the dynamic response of isolated bridges is presented by time-history analysis, which reveals the great value in the application of limiting displacement of isolated bridge.