高烈度地震区长联大跨连续梁桥减隔震措施研究

Study on Seismic Isolation Measures of Long-span and Long-unit Continuous Girder Bridge in High Intensity Earthquake Area

随着高烈度地震区连续梁结构的广泛使用,高烈度地震区长联大跨连续梁桥的减隔震措施研究更加重要。本文结合渭河特大桥主桥(50+8×100+50)m预应力混凝土连续梁进行抗震研究,对采用摩擦摆支座和黏滞阻尼器共同作用的减隔震措施进行了计算分析。结果表明,该措施能够使桥墩共同分担地震效应,提高桥梁抗震性能。

With the widely use of continuous girder structure in high intensity earthquake area, the seismic isolation measure for long-span and long-unit continuous girder is more important. Based on the main bridge of Weihe super large bridge ,which was a （50 ＋ 8 × 100 ＋ 50 ） m prestressed concrete continuous girder, the seismic isolation measure of friction pendulum bearing and viscous damper was calculated and analyzed. The results show that the seismic isolation measure can share the seismic response by all piers and improve the seismic performance of bridge.