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偏心支撑钢框架主要通过耗能梁段发生剪切屈服变形来耗散地震能量,其支撑斜杆必须不发生屈曲才能保证耗能梁段能够耗能。对于跨度较大的结构,支撑斜杆为了满足稳定性与轴压比限值的要求,截面需要很大,结构经济性不好,同时也导致地震作用下内力增大。将偏心支撑钢框架的支撑斜杆换成屈曲约束支撑,进行有限元分析,结果表明:罕遇地震作用下,带屈曲约束支撑的V型偏心支撑钢框架侧向位移比普通支撑钢框架最大减小22.15%,有效地控制了结构的侧移;能量时程图表明:屈曲约束支撑消耗了大部分地震能量,屈曲约束支撑和耗能梁段能够同时参与耗能,建立起结构抗震的多重防线。
Eccentric support steel frame mainly dissipates seismic energy through shear yielding deformation of the energy dissipating beam segment. The supporting diagonal bar must not buckle in order to ensure that the energy dissipating beam segment can dissipate energy. In the case of large span structures, the cross-section of the supporting slant rod needs to be large in order to meet the requirements of stability and axial compression ratio. The structural economy is not good and the internal force is increased under the earthquake. The results show that the lateral displacements of the V-shaped eccentric supported steel frame with buckling restraint under maximum earthquake stress are less than those of the normal supported steel frame Which is 22.15% smaller than that of the control. The time history of energy shows that the buckling restraint brace consumes most of the seismic energy, the buckling restraint brace and the energy dissipating beam segment can both participate in energy dissipation and establish multiple defenses against the earthquake .