| For the frame of SRC special-shaped column in normal temperature, the frame after high temperature function will have many differences. Its mechanics performance indicators such as material strength, elastic modulus and so on will decrease rapidly and the component damage of the different positions will have a different influence on the overall performance and seismic performance on different degrees. The frame structure of SRC special-shaped column which is a new type of structural system has good performance and the concept of seismic design has developed progressively. The antiquake fountion and performance-based research of SRC special-shaped column which has experienced fire should be paid much concern.Based on the above factors, this paper will take the damage form of SRC specialshaped column which has experienced fire as a starting point, and take the seismic performance and the performance level of the damage index of quantitative of the fired SRC special-shaped column frame as the research focus. The study is done by combing theoretical analysis and numerical simulation method. The main work content and conclusion are as follows:1. After learning both domestic and abroad based on the performance of seismic design theory, on the basis of comparing seismic component and normal seismic structures after fire macroscopic damage state the similarities and differences, combined with the temperature of the SRC special-shaped column frame, the failure pattern and failure process is suitable for this paper is presented to predict the SRC special-shaped column frame limit damage state which provide decision basis for the quantitative division of different levels of performance later. The nonlinear analysis software SNAP is used in seismic performance analysis of SRC special-shaped column frame. Contrasting to on simulation data and the citation data, the SNAP software is suitable, which provides a reasonable analysis tool for the below.2. The 500℃ isotherm in the section temperature field is defined as the boundary of component damage depth. Through the statistical analysis of section temperature field data about the SRC special-shaped column and combined the appraisal standard after fire, the corresponding damage depth of component by the fire time can be determined according to the section temperature field distribution of different section size and fire time.3. Given that the method of equivalent section method can simplify the workload and make sure that the accuracy of the calculation results is within the scope of the guarantee, which can reflect better mechanical performance of components after high temperature. The method of equivalent cross-section equivalent is used to simplify the fire artifacts. Using the finite element analysis software SNAP, the displacement control method is used for seismic performance analysis. Through the summary analysis of simulated data, it can be found that: the base shear of the SRC special-shaped column frame is determined by the fire layer location. Aimming at the the model which is fired at the bottom, the base shear of the SRC special-shaped column frame is determined by the damage depth. The stiffness degradation of fire layer has nothing to do with the location of the damaged structure, then it has a corresponding relationship with damage depth. Relative to the SRC special-shaped column frame at room temperature, the displacement in layers of fire layer increases significantly. The displacement of other layer has different degrees of lower.If the fire damage depth is more than 70 mm, the frame will appear the phenomenon of irregular lateral stiffness and so on.4. After the analysis of multiple damage models, this paper adopts the overall damage parameter DT in structure which is put forward by Ghobarah. Through the data statistics analysis, the different performance level of SRC special-shaped column frame which has different component damage depth is quantified by the damage index. |
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