Abstract:Rough set theory and artificial neural network are integrated into a model of seismic damage prediction for buildings. First the rough set theory is used to acquire the knowledge of classification, which includes the decision table construction, attribute discretization, attribute importance ranking, attribution reduction and rule abstract. Then the key components are extracted as the input of the neural network. The method reduces the structure of neural network model, and raises efficiency of training and accuracy of prediction. The importance ranking of these factors to earthquake - resistance performance can be obtained by this model. The research shows that the prediction results agree with actual seismic damage of multistory masonry building.

Abstract:Detecting seismic event automatically and accurately is the base of earthquake rapid report. In this paper, a new method of automatic seismic event detection（EGLP） is proposed, which is based on the characteristics of seismic signal such as non-Gaussian, non-linear, plane polarization and STA/LTA method. Appling on Shangdong seismic network＇s digital seismic wave. It is found that the new method can suppress the Gaussian noise and make seismic signal evidence, improve the accuracy of seismic event detection.

Abstract:To aim at the third level seismic fortification target： not collapse in severe earthquake conditions, an optimal design method for spacial frame structures under the severe earthquake loading is perfrothed. According to the design concept： get the best design with the same cost, the optimization mathematics model is established to minimize the maximal relative displacement between neighbor floors in building structure under severe earthquake loading, meanwhile, to satisfy the structural volume constraint. The model is solved with the improved complex method. At last, the 3-D seismic optimal design of a space frame is demonstrated by the second exploitation based on the explicit dynamic analysis soft ANSYS/LS - DYNA. The numerical value result indicates the design method not always achieve the optimum design of the seismic structures, but it can obtain a series of better seismic designs. So the optimal design method can be used in the practical engineering.

Abstract:Through the review to operation of public emergency financial supporting system in Dayao earthquake, Yunnan province, in 2003, some problems in this system when face earthquake event are analyzed. Combining with present situation of the system, refereing to Japanese experience, some suggestions on financial emergency support system in our country are given.

Abstract:Yingwei fauh zone is the northern segment of famous Tanlu great fault system loeatied in Bohai sea area. Owing to be influenced by some early faults in NW direction, Yingwei fault zone can be divided into three segments which have apparently- strike-slipping tectonic characteristics and different accompanying tectonics. Typical strike-slip fault properties are presented in deep structure of Yingwei fault, where it cut deep into Moho and even the whole lithosphere, and become the surging passages for hot materials or basaltic materials from the mantle. By synthetically analyzing the structural evolution of regional plate tectonics, development of sediment basins and characteristics of magmatie activities, the evolution history of Yingwei fault is divided into three periods： the left-lateral strike-slipping period from late Jurassic to early Cretaceous （J3 - K1 ）, extensional period from late Cretaceous to early Eocene （ K2 - E2 ）, and right- lateral strike-slipping period from Oligoeene to now （ E3 - Q ） , and the dynamic mechanism for each period are discussed also.

Abstract:The dynamic balance equation of tunnel structure under an explosion loading action is established based on the theory of cylindrical thin shell structure. An integral equation in the Fourier transformed filed that represents the displacement field in tunnel under the explosion loading is deduced by using the integral transformation. Taking an engineering project as example, the time-history curves of displacement and maximum circular normal stress in explosion center are given by using the inverse fast Fourier transform （IFFT）. Furthermore, the variation curves of displacement and the maximum normal stress at a certain time in x direction are given also. The results show good agreement with the numerical computation results. This mean feasibility of the model and the method.

Abstract:The study of karst collapses is still in macroscopic and qualitative level right now. The PLS Path Model adopts the iteration solution of monogenesis or multivariant linear regression, does not need to hypothesize the probability distribution of observation variables. In this model the requirement of sample point capacitance is very loose, and the problem that the model can not be recognized does not exist, so it is an effective linearity statistics modeling method. In this paper, based on the analysis of the influence factors for karst collapses in Wuhan and GIS technique, the PLS Path Modle is used to forecast the hazard potentiality of karst collapse in Wuhan city with a good results. It is found that the application of this model could get good effictiveness and this model should be adopted widely.

Abstract:With prediction methods which have clear physical- meaning, are less related each other and with catalogue, the possibility location and condition of moderate-strong earthquakes in Xinjiang region are discussed. The result shows that the low frequency of M3 earthquake lasting longer than 3 months, M5 earthquake quietness lasting 6 months reflect mid-short term character of occurring M ≥ 6 earth- quakes, and corresponding rate is greater than 83%. Taking M4 earthquakes occurring within 3 months after M6 earthquake during the earthquake active phase as the response earthquake, the rate of occuring a mid-strong earthquake is 62% in the range of 250 km within one year, and 79% within 2 years. Taking low value - returning of b value in response region as possible occurring condition of prepared focal region, occurring rate is 7507o within one year, and 9207o within 2 years.

Abstract:Many silt post-liquefaction deformation tests are carried out in a new universal triaxial apparatus of Hehai University in order to study the influence of silt particle content on post-liquefaction stress-strain relationships. The whole process from liquefaction to post-liquefaction deformation in a strong shock is simulated by forcing dynamic loading to some severity liquefaction and then forcing monotonic loading. The stress-strain relationship for different silt particle contents of silt soil can be demonstrated by same formula. It is found that the influence of silt particle content can be obtained only from analyzing the coefficients of the formula. The results predicted by the formula compared favorably with experiment observation.

Abstract:Adopting the method of wave function expansion, the potential functions of incident, scattering and infracting SH waves are expanded to the form of series of Fourier - Bessel functions, and the expressions of potential functions in each local cylindrical coordinate are obtained with help of the Graf＇s addition theorem. The theoretical solutions of multiple scattering of SH waves by two separated tunnel linings are also obtained, according to the conditions that the stresses and displacements are continuous at the boundary of the linings and their adjacent rocks, and the inner sides of the linings are free. The digital calculation result indicats that the incident frequencies, the distances between the linings, the ratio of linings＇moduli to adjacent rocks, and the linings＇thicknesses are important factors which influence distributions of the normalized displacements and dynamic stress concentration factors on the inner sides of the two linings. The results provide some theoretical basis for earthquake evaluation of two or more linings

Abstract:Usually the 1 D-coherence model is used to simulate seismic excitation, that means only a variation which travels along the direction of seismic wave is considered. However, when the distance between two points, which are at vertical direction to the wave way, is some long （ e. g. at both side of a bridge } , the coherence appears. In this paper, based on 2D-coherence model, using the triangular series method, considering the effect of frequency to wave velocity and the effect of seismic wave lag to non-uniformly modulation function, the artificial seismic wave is formed to every support of a self-anchored suspension bridge. The wave is used to research the seismic responses of the bridge structure in different excitation way. The result is compared with the result of 1 D-coherence, and from comparing some valued conclusions are gained.

Abstract:The basic principles of the TSP advanced forecast system are introduced first, and then the flexibility issues of the TSP system when applied to different lithology strata are analyzed based on the basic principles. The forecast efficiency of TSP in different strata is also analyzed through practical examples. The results indicate that the forecast efficiency of TSP in soft rock is worse than hard rock when there are not large size ill geological objects in strata.

Abstract:Through analyzing the data of tectonic background, neo-tectonic movement, paleoearthquake, based on the research results by the means of tectonic stress field simulation, seismogenic structure similarity, strong earthquake elapsing rate, quake-breeding and energy-storing condition, et al. , the scenario earthquake parameters in Yanqing - Huailai Basin are preliminarily studied. The result shows that the maximum magnitude of scenario earthquake is 7, on the seismogenic fault of Fangjiachong - Yingmen- kuang, and focal depth is about 10 km.

Abstract:Using the Outgoing Longwave Radiation （ OLR ） data of NOAA satellite from the National Center of Environmental Prediction （NCEP） of U. S. A. , the monthly distance average and eddy field calculation are done, and the main characteristics of OLR field in Xinjiang are summarized. By analyzing the abnor- mal phenomena before moderate and strong earthquakes since 2003, it is found that high anomalous values appered very close to the epicenter regions before some of earthquakes. It is considered that this feature is related to the change of earth - atmosphere system before strong earthquakes. Applying OLR data to earthquake prediction can remedy shortage of the precursor station in Xinjiang.

Abstract:Adopting the method of whole time-pace scan on the 3D axial of time, space and strength, the non-steady-state precursory information of moderate seismic activity is identified. The result shows that the characteristic of moderate seismic activity changing from steady-state to non-steady-state is exist in the course of an earthquake pregnant. The non-steady-state seismicity pattern is different from traditional seismic gap and band, its spatial scope is bigger and it often appears about one year before the earthquake. It is called sign earthquake when the earthquake occurs not at open or unload end point （ intersection point） of non-steady-state pattern. Using the sign earthquake to predict the Ms ≥15.0 shock inner 100 km range in future 2 years, its prediction efficiency is R =0. 573.

Abstract:Based on the records of water-seismic wave of the dynamic underground water in observation wells of Shandong province to M8.5 earthquake occurred in South Sea of Indonesia on Step. 12, 2007, the responding characteristics of the water-seismic wave with different kinds of observation instruments and the influence factors are analyzed. It is considered that major factors for influencing the instruments＇s earthquake recording ability are hydrological and geological condition of water-bearing stratum in the observation wells, geological structure and the kind of observation instrument.

Abstract:The data from 118 fixed precursor observation stations in north region of Qinghai - Xizang Plateau are selected for research. A method of synthetic anomaly index, including the time and spatial synthetic index, extracting from the data of precursor observation nets, is presented. Using the spatial synthetic index we can research the evolution characteristics of short-term precursor before moderate-strong earthquake in the region, and using the time one we can judge the occurring time for future earthquake. The problem of anomaly area drifting caused by the station not well-distribute is also solved. As the example, the change cause of the time and spatial synthetic anomaly index before Xinhai Ms6.6 earthquake on Sept. 12, 2000, which showed ＂ spreading→consentrating to the epicentre→earthquake→spreading again＂, is introduced.

Abstract:Useing the G-R formula, the statistical relation of earthquake frequency and magnitude in east of Qinghai province and its adjacent region（ N34°-39.5° ,E96°-104° ） is researched. The result shows that the earthquake fitting correlation coefficient of middle and small earthquakes descended obviously before strong shock in certain range near the epicents. Through calculation a reliable medium-term earthquake prediction index for research area is obtained, with higher R value 0.631.

Abstract:Through three typical surveying examples from engineering sits, the application of high-density resistivity method to detect buried faults is illustrated. Compared with geological data, the inversion sections are explain and analyzed, and the methods for detecting buried fault, excluding other anomalies, explaining different electrical characters of fault and rocks are also discussed.

Abstract:The light steel portal frames with tapered members have been the main structure form of single- story long-span industry and warehouse building in China. In this paper, the development of research on stability and seismic response of portal frame with tapered members at home and abroad is reviewed briefly, the progress in the research on theoretical analysis, experimental investigation, and design method for the stability and seismic response of the frame is introduced. Meanwhile the problems in these two aspects and its practical application are pointed out also. In allusion to the insufficiencies of stability and seismic design items in some specifications for these structures in China, some suggestions for the stability, the seismic response, and the ultimate bearing capacity judging method of this type of structure are presented.