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强震后简支梁桥恢复重建处治技术是一个难点。该文依托汶川地震映汶路映秀岷江大桥恢复重建工程,对采用铅芯橡胶支座代替板式橡胶支座的简支梁桥的减震性能及减震效果进行研究。研究结果表明:采用铅芯橡胶支座桥梁结构剪力减震率均在48%以上,轴力减震率均在37%以上,弯矩减震率均在55%以上,顺桥向的桥墩底部基本上处于弹性阶段,尚未进入塑性状态,同时保证了桥墩底部斜截面抗剪的需要,极大地提高了结构的抗震性能,总体上保证了地震作用下桥梁的安全性能。
After strong earthquake simply supported beam bridge reconstruction and treatment technology is a difficult task. Based on the restoration and reconstruction of Yingxiu Minjiang Bridge, Yingwenchuang earthquake, this paper studies the damping performance and the damping effect of the simply supported beam bridge which uses lead rubber bearing instead of rubber bearing. The results show that the shear-induced damping of bridge structure with lead-rubber bearing is above 48%, the axial vibration damping rate is above 37% and the bending moment damping rate is over 55% The bottom is basically in the elastic phase and has not yet entered the plastic state. At the same time, the need of slanting shear at the bottom of the piers is ensured, which greatly improves the seismic performance of the structure and ensures the safety performance of the bridge as a whole.