Advanced Materials Research Vols. 838-841

Abstract: Through the vibration table testing, with the pine furniture model, the distance between the model and wall, as well as the experimental load and acceleration as the main research parameter. Research on the following aspects: (1) the effect of interaction on distance between the furniture and the wall of the influence of the interaction, (2) the interaction between furniture sliding, mobile and the wall, and the relationship between the test load frequency, acceleration, etc, (3) influence of furniture size on furniture sliding, mobile, etc. The results revealed that sliding volume increases as the frequency decreases significantly after the model collides with the wall; when the frequency increases, the movement of the monomer decreases. When the furniture is apart from the walls in a certain distance, the collision between them is prevented, and the movement of the models which collides the object is as twice as the movement the single one.

Abstract: In rare strong earthquakes, the steel structure may occur the nonlinear behavior and redistribution of internal forces. In order to understand the post-buckling behavior of steel structures and determine the weak areas of the structure, and then determine whether the structure under strong earthquakes meets the seismic design goal or not, this paper adopts the FNA method to analyze the response of large profiled steel structure under severe earthquakes. Finally, we draw some general conclusions which are valuable for designing the large profiled structure.

Abstract: This paper base on analysis of upper structure by SATWE and the effect of Isolation structure under the different horizontal seismic decrease coefficient by ETABS, and using PERFORM-3D on the macro to consider the energy dissipation of all the structure. In this article, there are four different coefficient: 0.25, 0.3, 0.35 and 0.4.Since when seismic intensity is 8 and the coefficient is less than 0.3, you must think about vertical seismic action, so the point of the coefficient 0.3 is a turning in the intensity curve of all the structure. Final we draw a conclusion that with the coefficient decreasing the energy dissipation of the nonlinear is reduced.

Abstract: this paper uses SAP2000 structure analysis software, designed a span of 60 m, rise-span ratio 0.25 of the double-layer spherical reticulated shell, the presence of isolation bearing of two kinds of structure forms are studied, firstly analyzes the dynamic characteristics of the two, and then used in the program focus on plastic hinge theory considering the material nonlinear and geometry nonlinear effect. EL selected seismic waves along the structure of the three-input, two structures were carried out on the elastic-plastic time history analysis.The results show that the original structure and isolated structure failure mechanism are basically the same, belong to dynamic instability failure. Structure by reducing the overall level of structure stiffness to make structural natural vibration period increases, large extent reduce the seismic response of the upper structure; And isolation structure improves the structure damage boundary peak acceleration, delay the time the collapse of the structure.

Abstract: The curved bridges suffered severe damages or even collapsed during 2008 Wenchuan Earthquake. A field survey of seismic performance of RC curved bridges was examined. Damage patterns and the probable causes of RC curved bridges including Baihua bridge and ramp bridge of Huilan interchange are presented and analyzed in this paper. The main failure was pure shear failure or shear-flexural failure of the pier columns. Bearings and expansion joints damage were another common failure pattern. Lesson learned from the damage of RC curved bridges in this earthquake, the recommendations on the seismic design of RC curved bridges are presented involving ductility of bridge columns, design of curved bridges, design of bearings and devices preventing girders falling down. Suggestions for the future seismic design and retrofitting of RC curved bridges are also presented in moderate to severe earthquake area.

Abstract: In this paper, a seismic isolation scheme by FPB about bridge in high-intensity earthquake area is introduced. Typical methods and calculation examples of using dynamic time-history analysis in this scheme as well as the process and methods of parameter determination and design verification of FPB are put forward. All these methods play guiding roles in the seismic isolation design of bridges and the design and application of FPBs.

Abstract: Because earthquakes may cause severe damage to buried pipelines, it is important to study dynamic response of buried pipelines. For dynamic response problem of buried pipelines, variational method is the suitable method. In the paper, Gurtin-type quasi-variational principle of buried pipelines dynamics is established by convolutional variational integral method, which is theoretical foundation of finite element method for solving buried pipelines dynamics problems.

Abstract: The selection of proper seismic input is essential for seismic response analysis of the gravity dam structures. For the near-field earthquakes, the direction of seismic waves is not always considered as vertical. The non-uniform motion produced by oblique incidence can cause significant influence to the structure. In this study, the obliquely incident method is applied in the finite element model of a typical section of a gravity dam located in southwestern China. The seismic response under obliquely incident of plane P wave and plane SV with different incident angles and tilt directions are discussed. The results show that the oblique incidence has an obvious effect on the seismic response of the gravity dam, and the inconsistence produced by oblique incidence cannot be neglected.

Abstract: Its a commonly used method to predict layer by using seismic attributes, especially for some of the less well control channel sand bodies whose role is more important. Putaohua reservoir in Gaotaizi oilfield mainly develop shallow water delta front subaqueous distributary channel sand bodies which has narrow rivers and thin sand bodies, meanwhile, the existing well density is difficult to control the trend and boundary of the channel. By using seismic forward modeling analysis techniques, this paper researched the differences of seismic reflection characteristics among different geological model of channel sand bodies, then , further pointed out the methods of channel sand prediction by using the peak number attribute and analyzed the predictive effect. The results show that this method can effectively improve the prediction accuracy of thin interbedded reservoir.

Abstract: After an earthquake event, the spatial distribution of seismic intensity of the event and extremely destructed area could be quickly evaluated by means of the empirical relationship between ground-motion parameters and seismic intensity, which has been proposed for years. This can provide a basis for the government to carry out emergency relief and reasonable distribution of relief supplies. In this paper, the computational methods of instrumental seismic intensity used at home and abroad are briefly introduced. By analyzing the advantages of the methods in the USA and Japan, a relatively simple computational method of seismic intensity is proposed. Firstly, the acceleration time history (A_all) and velocity time history (V_all) of the complete vibration are synthetized by the filtered three-direction acceleration and velocity time histories, and substituted in the empirical formulation. Then, the seismic intensity can be computed by the sorting method. After that, this method is compared with the intensity scale evaluation method and fuzzy algorithm by using the strong motion parameters of Wenchuan earthquake. The results show that the method proposed in this paper is better than the two methods and has certain practical values.