Advanced Materials Research Vols. 671-674

Abstract: Along with the rapid development of city, the research on seismic effect of the sites is gradually recognized. In this paper earthquake effects of several engineering sites selected from Shijiazhuang are studied, using the one-dimensional linear program and considering different seismic wave and peak acceleration. Through analyzing the characteristics of the seismic effects certain rule are summarized, and it can be taken as a reference for site seismic effects and seismic safety evaluation of this local area.

Abstract: Via the field investigation about farm building built on rural areas after the 2009, Ms=6.0 Yaoan earthquake in Yunnan province, China, the seismic damage of raw-soil structure and wooden structure have been put forward. Additionally, combined with the earthquake damage survey about the 1996 Lijiang and 2007 Ninger earthquake in Yunnan province, the seismic reinforcement schemes are proposed and appropriate costs are analyzed.

Abstract: Viscous boundary, viscous spring boundary, infinite boundary have been widely used during the last decades to solve the wave propagation in the infinite ground. In this paper we evaluate the performance of the three boundary conditions focusing on their solution precision. The comparison is performed on a two dimensional finite element model built by ABAQUS. The results show that viscous spring boundary outperforms the other boundary conditions, and viscous boundary is better than infinite element.

Abstract: In this paper, the timber structure buildings in the quake damage situation has been summarized. Analysis the rules and characteristics of ancient timber structures in seismic damage. Put forward basic methods for ancient timber structures in strengthening.In order to provides basis and method for timberwork seismic repair or reinforcement.

Abstract: According to the actual engineering conditions of Haokou RCC Gravity Dam, the 3-D FEM model of the typical overflow dam section and its foundation is set up. Using the response spectrum method, the responses of earthquake acceleration, displacement and stress of the dam and their distribution laws were studied under the seismic loading, and the anti-sliding stability of dam is also analyzed. The calculation results show that under the design earthquake condition, the maximum principle stress response of dam body is 2.26MPa, which appears at the dam heel. The safety factor of stability against sliding on the face of the dam foundation is 1.43 and the stability against deep sliding is 3.2. So this dam section can meet the strength and stability requirements of standard, its earthquake-resistant safety could meet the requirements of standard.

Abstract: To study the impact of floating roof on seismic response of vertical storage tank structure system subjected to seismic excitation, select 150000m3 storage tanks as research object, and the finite element analysis model of storage tanks with and without floating roof were established respectively. The seismic response of these two types of structure in different site conditions and seismic intensity were calculated and the numerical solutions were compared. The results show that floating roof has little impact on base shear and base moment in different site conditions and seismic intensity. Floating roof can effectively reduce the sloshing wave height. The influence of floating roof on dynamic fluid pressure decreases with the increase of seismic intensity, which is less affected by ground conditions.

Abstract: Collapse and severe damage of rural housing were found to be the main seismic damage of rural housing, which leads to a lot of casualties and loss. The violent earthquakes, such as Wenchuan earthquake and Yushu earthquake caused serious damages and gave lessons to the society for better seismic performance of rural housing. Due to limitation of the fund, technology and information, the rural houses lack of normal design, construction and necessary supervision of the government. The insufficient structural capacity and weak integrity may result in the collapse of bearing members and roof or truss under disaster-causing action. The typical damage of rural housing is presented and analyzed for demonstration. Some suggestions to effectively enhance the seismic performance is hence given. From the macroscopic view, publicity for more seismic knowledge should be proceeded and the complete supervision system should be improved. And the technological measure is stressed for better collapse resistant capacity by designing reasonable structural system and reliable connection.

Abstract: Composite steel plate shear wall (CSPSW), as a new lateral force resisting structure composed of steel plate and concrete slab, is introduced. CSPSWs can fully display the superiority of the steel plate and concrete. Ductility and energy dissipation capacity of the walls are increased and seismic behavior is improved. Recent seismic research around the word of two kinds of CSPSWs, namely, CSPSW with signal steel plate and CSPSW with double steel plates, is presented and discussed comprehensively. Some existing problems in current research of the walls are also reviewed in this paper.

Abstract: Transfer Matrix Method was used to calculate the frequent earthquake responses of high-rise building with different facade shapes. At the premise of constant lateral rigid and same bottom storey mass and supposing that the facade shape variability is simulated by the change of storey mass, the relationship between the maximum value of seismic response and the structure total mass were obtained. Results show that up concave shapes are more optimal than down concaves, pyramid and homogeneous shape as long as the structure deformation being within a reasonable range. If the building height is the most seeking aspect of the design, an up concave shape should be adopted and the building bottom size can be amplified according to the required architecture scale. On the other hand, up concave shapes can’t adapt to a rather wide range of total mass. If the construction field is limited and the architecture scale must meet the requirement, the homogeneous shape should be adopted.

Abstract: The borehole strong-motion (SM) records from the 2011 MW9.0 Tohoku earthquake are analyzed, and we find ground tilt is the main error source of the SM records. The assumption is made that the time in when ground tilt fluctuates tempestuously (transient tilt) can be determined by the vertical velocity time-series. Then, we propose a two-step algorithm to correct these errors, which involves fitting a straight line to the tail portion of velocity for permanent tilt and average error processing of the transient tilt and noises caused by it. The transient tilt is unknown, but its final influence can be estimated as the velocity at the time when strong shaking ceased. The horizontal accelerograms are corrected and the displacements are obtained by double integration. Comparing with the GPS data, seismic displacements can be recovered by the corrected underground SM acceleration records.