过渡层位置对SRC-RC竖向混合结构抗震性能影响

Impact of the seismic performance in different transition layer position's SRC-RC vertical hybrid structures

SRC-RC竖向混合结构具有较高的经济性和抗震性能,在我国部分城市的高层、超高层建筑中均有所应用。目前国内对SRC-RC竖向混合结构过渡层位置尚无明确规定,关于过渡层位置对SRC-RC竖向混合结构抗震性能影响的理论研究明显滞后于工程实践。文章以一幢40层的SRC框架-RC筒体竖向混合结构为例,通过对不同地震作用下过渡层位置的剪力与位移的计算分析,研究了不同过渡层位置对SRC-RC竖向混合结构抗震性能的影响。结果表明:多遇地震作用下,过渡层设在18层和24层时,过渡层处剪力变化幅度分别为272KN、272.2KN,层间位移差均为0 mm,表明结构抗震性能较好;罕遇地震作用下,过渡层设在6层和12层时,过渡层层间位移角差分别为-0.277×10-3和-0.925×10-3,过渡层处的层间位移角变化幅度较小,表明结构抗震性能较好。

Economy and the seismic performance of SRC-RC vertical hybrid structure is better which has been used in some high-rise and super high-rise buildings in our country. Nowadays transition layer position of domestic SRC-RC vertical hybrid structure has been not specifide, so theoretical research on seismic behavior of hybrid structure of SRC-RC vertical impact of transition layer is obviously lagging behind in engineering practice. In this paper, the seismic performance of SRC-RC vertical hybrid structures was studied through a 40-story SRC frame-RC core wall vertical hybrid structure with 7 different transition layer positions and 7 groups of model by using PKPM software＇s SATWE and EPDAPUSH. Model 1-Model 6＇s shear force in frequent earthquake and the displacement of structure in rare earthquake were compared with the Model 7. The results show： in frequent earthquake, the shear differences were 272KN and 272.2KN, and the displacement differences were 0mm and 0mm when the transition layer was set in 18 and 24. The shear differences and the displacement differences were smaller, so the seismic performance was better. In rare earthquake, the displacement angle differences were -0. 277 rad × 10^-3 and -0.925 rad × 10^-3 when the transition layer was set in 6 and 12. The displacement angle differences were smaller, so the seismic performance was better.