Advanced Materials Research Vols. 1065-1069

Abstract: The existing methods of curve beam bridge is the finite element method, the modeling and analysis of complex, heavy workload, not suitable for the proposed design method of regularity. According to the character of curved bridge, the bridge superstructure and piers is simplified as packing quality model that have two levels of degrees of freedom and a surrounding mass center shaft torsion degree of freedom, then the analysis model of double mass simplified 6 degrees of freedom is established, studying the dynamic characteristics and the structure vibration behavior through the dynamics equation of curved bridges. Example show that,the results of double mass model with the traditional of finite element model is consistent, double mass model has simple calculation method and can consider the influence of sensitive factors, with the help of programming is more suitable for the proposed design method of regularity. At last, Application MATLAB programming discussed the critical angle of the curved bridges under multi-dimensional earthquake based on double mass model, after change the curve bridge related parameters only one operation can achieve the most disadvantaged angle.

Abstract: By investigating on rural housing construction in Djetis county, a region of Java Island Banjul, Indonesia, modeling according to their different weight of roofs and other factories, and combining with 3D seismic wave that was gotten by American EL Centro-seismic wave amplitude modulation to analyze by the finite element, it is shown that the larger quality of roof and the greater the displacement of itself each part, the bigger influence of structure and the easier causes damage. Maximal displacement produced by out-of-plane is larger than maximal displacement produced by in the plane, so the out-of-plain damage is the main cause of structure damage. In addition, based on the finite element analysis, precaution against earthquake measures of limiting to widen the top roof truss girder cross section and setting continuous wall between coupling beam are presented.

Abstract: The spatial distribution function assigns seismicity parameters of seismic zone and belt to the potential earthquake source area seismic by the magnitude interval, determination of the spatial distribution function is one of the key technologies to comprehensive probabilistic seismic hazard analysis methods, and the results will directly influence seismic hazard analysis results of the calculated sites. However, the spatial distribution functions are hard to get by statistics due to serious lack of seismic samples, and evaluation factors used in the actual work are too complex and not independent, the spatial distribution function is lack of reliability. In this paper, Bohai seismic tectonic area is chosen as an example; geological data are obtained from the newly built offshore oil platform engineering in recent decades, while seismic activity data are obtained by checking from historical difficult seismic parameters. Five factors are adopted in this area, including potential seismic focus area, seismic tectonic, seismic activity level, long-term forecasts, and strong earthquake recurrence interval and construct empty segment. Spatial distribution function of Bohai Sea earthquake structure area is obtained by weighted comprehension; it reflects the spatial and temporal heterogeneity of seismic activities in the area, and provides the calculation parameters for the probabilistic seismic hazard analysis.

Abstract: Dynamic simulations of structures to determine their seismic performance is an essential part of civil engineering research. Time integrators of increasing sophistication has been elaborated over the last few decades to achieve higher order accuracy, unconditional stability, computational efficiency and high-frequency dissipation. This paper tries to extend 1-stage Rosenbrock-based integrator to an integrator of second-order accuracy without losing computational efficiency and unconditional stability. Initially, 1-stage Rosenbrock integrator is introduced and its order of accuracy is studied theoretically. According to accuracy analysis, a force term at the end of current step is considered, resulting a novel integrator of second-order accuracy. Moreover, the stability of the proposed method is studied by means of the energy method. To investigate its performance for nonlinear structures, numerical simulations are conducted on a shear-type structure including a pendulum.

Abstract: The liquefaction failure forms are reviewed, including foundation strength failure, sand boil, seismic settlement, large ground displacement and flow slide. Taking pile foundations and buried pipeline as examples, there suggested some measures to reduce hazards of liquefaction.

Abstract: Enping sag is located in the west of Zhu 1 sag of Pearl River Mouth Basin. In order to verify the reservoir spreading of Enping sag in Pearl River Mouth Basin and provide the reliable basis for reserves prediction. In this paper, according to the actual seismic data extracting the theoretical seismic model, applying spectral method to construct the acoustic wave equation, and then, deducing the partial differential equation resolution of absorbing boundary condition. Through the forward modeling summarized the seismic response characteristics of oil layer, and making a forward modeling with actual parameters of wells model. Finally obtained the expected effect.

Abstract: This thesis analyzed the technical characteristics and equipment selection of several methods in realizing the mechanization of waste dumping of deep well foundation, and proposed the development direction of waste dumping machines in our country.

Abstract: Cement mixing pile is widely used in weak subgrade treatment and the quality of it has a direct bearing on the treatment effect of weak subgrade. Core drilling method is an effective method of testing quality of cement mixing pile. However, there are certain deficiencies in quality evaluation method of this kind of piles during practical application. In this paper, auxiliary evaluation criterion, established through standard test pile and combining with subgrade testing engineering is applied to the quality evaluation on test pile with construction deficiency after being combined with existing evaluation system. The result shows that the adoption of evaluation result of improved quality evaluation system can well reflect the pile construction quality of the test pile under complicated soil layer condition and is a reliable method of pile quality evaluation.

Abstract: Through the construction process of the Administrative Center Station, Kunming rail traffic, study the construction technology of long spiral bored piles, for engineering characteristics and difficulties, put forward the proposed measures, and analyze the application prospects of the technology.

Abstract: This thesis introduces the main process flows of holding pole lifting and supporting pole installation during the tower erection by combining the landform features of “high mountains and highlands in Eastern Tibet and Western Sichuan Province” of power transmission and transformation of grid networking between Changdu of Tibet and Sichuan Province, aiming at the problem that that the line stringing of holding pole is influenced by landforms of cliff, etc. and adopting light combined compound-material holding pole as lifting mechanism, to solve the tower erection at the tower positions like cliff and isolating mountains where traditional holding poles cannot be erected effectively.