Seismic Performance On New SRC Type Of Braced Frame Structure

With the continuous development of tall buildings, people put forward for the higher requirements of safety and economy. New SRC Stiff frame support structure is a relatively safe and economic structure of high-rise buildings, which is composed of the SRC members, steel braces and concrete structures,giving play to their respective advantages. In this paper, instead of buckling support, center support give the idea for high-rise or high-rise building and reduce the engineering costs of high limit meeting the conditions of satisfaction.The new SRC type of braced frame structure is composed of seismic unit system and vertical stress unit system. According to the classification of two unit system in the whole structure system, the seismic unit system is mainly used for resistance of lateral force and the gravity, the vertical stress unit system is mainly responsible for the dead load and a small amount of shear force.The seismic unit system and vertical unit system of great difference in stiffness. Seismic unit system mainly arrange at the outside of the new SRC braced frame. The stiffness of the preliminary design in general is about 5 times than vertical stiffness of the unit system, ensuring the seismic shear system to reach more than 3 times vertical shear force unit system. It is shown that this can be achieved in the study. The design of vertical unit system based on the general section of frame beam column size selection.Through the design and comparision,we do research on earthquake response under different seismic fortification intensity among New SRC Stiff frame support structure,the new SRC frame, and frame shear wall.The approach adopted in this paper are response spectrum analysis, time history analysis and nonlinear static analysis.The artical use finite element analysis software SAP2000 simulation,comparing analysis of its advantages and disadvantages, to find a reasonable design method and reinforcement measures.In the elastic stage, the vertical stress unit system plays a major role, but the stress is smaller. Through the reinforcement of the structure,the requirement of the stage can be meet. Seismic unit system play the role of the force as the vertical unit system. For a single component, if the shear between element seismic unit andvertical unit is the same or different on a small scale, lastic seismic unit system is the same as vertical system unit in elastic stage.In the elastic-plastic stage, it can be seen from the Pushover curve, the structure has great energy reserves to support the new SRC steel frame under frequent earthquake and earthquake fortification in the elastic phase, under strong earthquake,the structure is not yield entirely, but its performance point displacement is far less than the limit value specified by the code description that, which means the elastic-plastic performance of the structure better, with higher energy reserves. For elastic-plastic analysis, it can be seen that the beam hinge first appeared, and will not change ductility of the structure, then support the axial hinge, after the column plastic hinge, but concrete columns belong to vertical stress unit system do not appear hinges that the seismic unit which can protect the building structure from earthquake hazards under rare earthquake. Through the elastic-plastic analysis results showed that the cross section and the length of the bars will be affected on the hinge production results, in accordance with the current code for design of novel SRC stiff frame support structure has good ductility. It also shows that the existence of a large amount of waste, in rare earthquake structure in minor damage to the state, in meeting the performance requirements of, can modify the structure section, also can consider the floor height increases.This article is divided into five chapters, first three chapters mainly talk about the idea, model of SRC stiff frame structure layout, the principle of response spectrum analysis and time history analysis and the static elastic plastic analysis of principle;the fourth chapter is the engineering example and the stress analysis, the fifth chapter is summary and prospect. This paper can be complex high-rise buildings to provide a new way of thinking.This article is divided into five chapters, first three chapters is mainly about the idea, model of SRC stiff frame structure layout, the principle of response spectrum analysis and time history analysis and the static elastic plastic analysis of principle;the fifth chapter is about the comparation between SRC Stiff frame structure,the new SRC frame structure;the fifth chapter is about the engineering example and the stress analysis, the sixth chapter is summary and prospect. This paper can provide a new way of thinking on complex high-rise buildings.