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以某钢桥的“斜腿刚构部”为例,利用有限元软件TDAPⅢ建立模型,输入横桥向地震波进行时程分析。验算发现,主要受力构件存在屈曲现象。将斜腿的部分斜杆替换为防屈曲支撑并重新分析计算,数值结果表明:加固后结构的安全性显著提高,稳定性符合规范要求;该加固方案会减小大桥的横桥向抗侧刚度,但并未增大横桥向地震位移,斜腿和主桁代表性单元的节点在横桥向的最大地震位移分别减小了15.72%和19.15%;防屈曲支撑在地震过程中可产生较大的轴力和变形,但均未超过容许值,其滞回曲线稳定且饱满。因此,将大桥斜腿的部分斜杆替换为防屈曲支撑的加固方案安全可靠,能达到加固目的且不增大结构的地震位移。
Take a steel bridge “slant leg rigid structure ” as an example, using finite element software TDAP III to establish a model, the input transverse wave seismic waves for time-history analysis. Check found that there are buckling main force components. The results show that the safety of the structure after the reinforcement is significantly improved and the stability meets the requirements of the specification. The reinforcement scheme will reduce the transverse stiffness of the bridge in anti-buckling , But did not increase the earthquake displacement of transverse bridge. The maximum seismic displacements of the slanting legs and the representative elements of the main girder in the transverse direction decreased by 15.72% and 19.15% respectively. The buckling brace could produce more Large axial force and deformation, but did not exceed the allowable value, the hysteresis curve is stable and full. Therefore, it is safe and reliable to replace the partial slant bars of the bridge slant legs with the buckling brace reinforcement scheme to achieve the purpose of reinforcement without increasing the seismic displacement of the structure.