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Difference between ordinary steel brace and buckling restrained brace
Published:2022-10-20 16:46:50 Browse: time
Buckling restrained brace damper is a kind of buckling restrained seismic member, which overcomes the shortcomings of compression buckling of ordinary brace, and has the characteristic of no buckling under tension and compression. The center of the buckling restraint support is a core plate, which is different from the ordinary support in that it is equipped with a casing outside. The general casing is a steel casing, and the core plate is placed in the steel casing. Between the steel casing and the core plate, there is a filler material, usually concrete or mortar. In order to reduce the force transmitted to the filling material when the core plate is subjected to axial force and the expansion under pressure, a certain gap is usually left between the core plate and the filling material or a layer of unbonded material is added. The load borne by the buckling restraint support is all borne by the core plate, and the steel sleeve and filler materials only constrain the compression buckling of the core plate, so that the support can yield under both tension and compression. The seismic dampers with buckling restrained braces in buildings have the characteristics of high bearing capacity, good ductility and hysteretic performance, and are easy to be arranged in reinforcement projects.
 
The manufacturer of building buckling restrained brace damper used a shaking table to test the seismic performance of the structure without reinforcement and strengthened by buckling restrained brace under earthquake action. Through the research, the seismic response of the structure is controlled and the failure mechanism is improved after the buckling restrained brace is strengthened. After the single span frame and the strengthened frame scale are reduced, the pseudo static test is carried out. The bearing capacity, stiffness, ductility and hysteretic curve of the last two structures are compared to verify the feasibility of buckling restrained brace reinforcement. Low cycle repeated tests were carried out on the frames before and after strengthening with buckling restrained braces. The mechanical behavior, failure mode and displacement ductility of the two structures are studied, and the hysteretic behavior of the brace is analyzed. According to the test results, the analysis results show that the seismic performance of the structure strengthened by the buckling restrained brace damper is better