Advanced Materials Research Vols. 671-674

Abstract: In order to acquire the seismic performance of three different types of nodes between the concrete frame and the light steel adding storey, the pseudo-static tests were carried out to analyse contrastively these specimens’ failure modes, stiffness degradation, hysteretic curves and energy dissipation. The test results showed that : Three nodes’ destruction were due to the plastic hinges emerging at the end of beam; both encased steel and carbon fiber strengthening method can improve the seismic behavior, and in terms of the ultimate bearing capacity, energy consumption ability，the encased steel strengthening one can improved more significantly, and the encased steel one can effectively slow down the speed of stiffness degradation.

Abstract: With an actual project example, a parametric model of the evacuated square pyramid space grid was established. The natural vibration characteristics and seismic response analyses were carried out by ANSYS, and the results were compared with the square pyramid space grid. The distributions of dynamic internal force of bar members were summarized under vertical earthquake action and horizontal earthquake action. The research shows that evacuated square pyramid space grids is a reasonable structural style for the large-span roofs due to good mechanical properties and low steel consumption. The results provide an important guiding significance for engineering design and development of this structure.

Abstract: Based on the pseudo-static tests among three different types of joints (traditional planted-bar joint, the CFRP strengthening joint and the transformed-connection joint) between concrete frame and adding light steel storey, the research was carried out to contrast the seismic performance of these joints. The results showed that: three joints’ destruction was due to the plastic hinge and the maximum crack appearing at the end of beams, the seismic performance of the two new types of joints were better than the traditional planted-bar joint; Among the three joints, the hysteresis curve envelope area of CFRP strengthening joint was the biggest and the energy consumption was the most powerful; The stiffness of transformed-connection joint was improved significant, and its manufacture technology of joint was simple and convenient.

Abstract: Using the APDL language of ANSYS which is the large general-purpose finite element software, the finite element (FE) model of new bolted beam-to-column connection for concrete-filled square steel tube (CFST) is established. The simulated analysis for the seismic behavior of the new semi-rigid connection under low-cycle reverse loading is carried out by the FE method. It is focus on the method study on establishing geometry model, selection of element and its parameter, setting up boundary restraint and solution during FE analysis. Through comparision it is found that the calculated values and the experimental results are very close, which verifies the correctness and rationality of the method in this paper. The research work provides fundamental basis for future intensive study on seismic behavior of the new connection.

Abstract: This article analyzed the influencing factors for earthquake resistance performance of load-bearing wall through the establishment of finite element model and the reasonable load way. The factors of vertical stress, masonry strength, and horizontal reinforcement strip were analyzed, and relevant conclusions were drawn. The results indicate that the masonry strength is the main factors affecting shear performance of the wall and the horizontal reinforcement strip enhance the seismic behavior of the wall.

Abstract: In order to study the conversion layer position to the effects on seismic characteristics of high-rise structure, this paper made the frame supported structure of high-rise building model using finite element software Etabs. Through four different height conversion layers of analysis model, it studies the setting height to the influence of the dynamic characteristics on the structure system. The results shows that the conversion layer position will all produce unfavorable effects on seismic performance for the whole structure, no matter that too low or too high.

Abstract: This paper studied on vibration energy dissipation analysis of a shear wall structure with viscous liquid dampers for reinforcement and reconstruction. Viscous liquid dampers and herringbone steel shotcrete were used for seismic control and the elastic-plastic time history analysis had been carried out. The results show that: the first layer shear force decreases. The minimal average damping rate of layer displacement in X direction is 4.68% and the maximum is 12.92%; the minimal average damping rate of layer displacement in Y direction is 6.47% and the maximum is 19.8%. So using viscous fluid dampers , the vibration response of the structure could be effectively reduced．

Abstract: Reinforced concrete eccentric frame - shear wall structures has been widely used in Engineering, but this structure is mostly used for high-rise structure. Depending on experimental study will be unable to accurately draw the seismic reflection of structure, it needs to use the simulation software to study the seismic performance of high-rise structure. In this paper, by using ANSYS finite element analysis software to establish the numerical model which is based on the test model to carry out the seismic performance simulation. Then, through the improvement measures to get the measures for improved seismic performance.

Abstract: To investigate the response of the bridge pounding, shaking table test was performed using 1/10 scaled reinforced concrete rigid frame bridge specimen. The influence of traveling effect on pounding and the anti-impact capability using dampers were discussed. The experimental results demonstrate that the acceleration responses of the girder and bridge piers, the frequency and the impact force are increased when the traveling wave excitation is considered. Moreover, relatively displacement of the adjacent bridge frames increased magnitudely. Dynamic responses, the frequency and the impact force are decrease when the dampers are installed.Therefore, installation of the dampers is a sustainable and effective way to improve the anti-impact capability.

Abstract: Characterized by the strengths of earthquake proof and waste utilizing, the foamed concrete cast-in-place wall, one of the newest building materials, have been widely used in the architectures within the earthquake-prone areas. This paper conducts research into the problems of the foamed concrete cast-in-place wall during its application such as defective industry standards, low intensity, poor producing condition, etc. Then it analyzes countermeasures that could be taken to promote the development of the foamed concrete cast-in-place wall including completing relevant systems, improving intensity by altering additives, perfecting production process and improving production equipments, etc.