Applied Mechanics and Materials Vols. 580-583

Abstract: brittle nature of masonry infilled wall and the wrong connection with the main structure , resulted in the destruction phenomenon in the earthquake . Based on the destruction phenomenon ,this paper analysis the Earthquake damage of masonry infilled wall , according to code for seismic design of buildings (GB50011—2001) and code for seismic design of masonry structures (GB50003—2011) , some seismic fortification measures were proposed in this paper aimming to improve seismic capability of infilled wall, thereby alleviate loss caused by earthquake.

Abstract: In order to further regulate the vertical earthquake action in seismic design specification, to overcome the unreasonable and inconvenient flaws in certain conditions by using vertical to horizontal spectra ratio function, the feasibility of stipulating vertical design response spectrum with the same way of horizontal one is deal with in this paper. 1513 sets of three component records during 64 earthquakes from NGA-west1 database are selected and grouped by magnitude, distance and site conditions. Average acceleration response spectrum of each group is generalized to get the corresponding mean maximum amplitude and effective peak acceleration EPA. Furthermore, some groups with EPA in an interval are merged into one. Once again, the parameters, such as maximum amplitude and characteristic periods of each final grouping are acquired by the same way. The former is divided by the corresponding horizontal value for site category, to obtain the site coefficient for vertical action. Finally a preliminary suggestion of vertical site coefficient and characteristic period are presented. Comparison of observed data with results from the new suggestion and those from spectral ratio shows that the improvement of this study is obvious.

Abstract: Assembled precast concrete structure is composed of precast element, which needs to be assembled and connected as the main force component. It is propitious to the development of building industrialization, enhancing production efficiency and promoting green building. Seismic response of a 6 storey assembled precast concrete residence was analyzed based on finite element software ANSYS. The results show that stiffness of assembled precast concrete residence is larger, and all of interbedded drift angles comply with stipulations of the standard.

Abstract: The available methods to determine the ultimate displacement of the building structures have been put forward, and the disadvantages of the methods are analyzed. According to the seismic design theory based on displacement of structures and reinforcement standard of Chinese ancient architecture, which refers to the modern structural engineering requirements, the ultimate displacement of the timber structure on Chinese ancient buildings, which is under the obvious P-∆ second-order effects, has been studied. The ultimate displacement and the drift ratio limit value of different axial compression ratio are determined by the experiments and Theoretical calculation. The results of the study of ultimate displacement can provide the technical support for the rehabilitation of the ancient timber buildings.

Abstract: Incorporating the probability of seismic hazard, expected annual earthquake loss with different collapse margin ratio (CMR) has been studied in this paper. Nonlinear simulation models of reinforced concrete (RC) frames were analyzed using incremental dynamic analysis (IDA) under continuous earthquake intensity. The analytic results from four examples of RC frames show that the expected annual loss has negative correlation with the CMR of the concerned structures, and seismic loss basically decreases with increasing CMR at given ground motion intensity. The proposed idea herein could be regarded as a promising improvement on the quantification of earthquake loss estimation by utilizing CMR of structures.

Abstract: This paper analyses the frame without mild steel dampers and the frame installed the new T-type , box –type and S-type mild steel dampers by FEM ABAQUS. The results shows the frame installed the new mild steel dampers have smaller yield displacement and the fuller hysteresis curve at low cyclic load, but the initial stiffness, yield strength , stiffness after yielding are greater. Research shows that the new type mild steel dampers have good energy performance, and have the better effect to seismic framework.

Abstract: In recent years, with the frequent occurrence of earthquakes, the impact of earthquakes on the bridge has been increasing. Every time the earthquake occurred, bridges there almost got varying degrees of damages, hindering the normal traffic and losing the important role as emergency rescue and disaster relief channels and emergency shelters. Therefore, the seismic loads must be taken fully into account in the bridge design and seismic strengthening of bridge is necessary. Besides, the old bridges already put into normal operation must be reinforced appropriately according to the site condition. This paper described the various types of seismic damage of bridges and summarized several methods of seismic reinforcement of bridges.

Abstract: The shaking table tests are conducted on a 5-floor steel frame model with a scale down of 1:6. The traditional anti-seismic structure and isolation structures with isolation layer in different position are adopted. The results indicate that the natural vibration periods of isolation structure are longer than anti-seismic structure, and when the isolation layer is located in a lower position, the period becomes longer and the damping effect is better.

Abstract: By studying the structure of vulnerability analysis and abroad , on their respective merits and defects were compared and analyzed to select the best of vulnerability research methods. Combined with the existing building characteristics, the nonlinear static method on both the vulnerability analysis of old buildings also applicable conclusions. Effective solution to the existing buildings under earthquake disaster risk assessment.

Abstract: In this paper, based on the Midas/gen platform, a three-dimensional finite element model (FEM) for a transfinite stadium with a large-span and large-cantilever roof , located in Shenyang, was used to study its potential responses to seismic activities. In the numerical analysis, an earthquake spectrum stipulated by the Chinese Seismic Code (GB50011-2010) was adopted to calculate the bidirectional horizontal displacements by the Complete Quadratic Combination (CQC) method on the basis of the response spectrum analysis. The computational results indicate that the maximum displacements in both of the two horizontal directions locate at the top of this structure, i.e. the transfinite part of the roof.