【摘要】 绵竹市回澜立交桥跨越绵竹货运火车站,包括主桥及4个平面为圆形的曲线匝道桥,匝道桥为连续箱梁结构。5.12汶川大地震中,回澜立交桥遭到严重破坏,通过对震害的现场调查及分析发现,圆形匝道桥破坏严重,每个匝道桥破坏集中于1-2个抗弯刚度较大的低矮桥墩并引起上部箱梁横向断裂,其余桥墩发生轻度或中度破坏,主要为桥墩混凝土保护层脱落、混凝土开裂及墩顶橡胶支座的滑移,且总体来看,匝道桥破坏沿切向更为明显。主桥破坏相对较轻,主要包括桥墩顶部的支座滑移及主桥与匝道桥间的碰撞破坏。更多还原

【Abstract】 Huilan Interchange across Mianzhu Freight Station consists of main bridge and 4 circular ramp bridges with continuous box girders.The bridge was severely damaged during the Wenchuan earthquake on may 12th,2008.According to the field observation and analysis,it is concluded that the damage to ramp bridge was especially severe,1 or 2 short piers with large flexural stiffness suffered severe damage and the box girders ruptured as a result of the damage to the piers.The other piers of the ramp bridges suffered minor-to-moderate damage,which included concrete cover spalling,concrete cracking and sliding of the rubber bearing at top of the piers.Also,it is founded that the damage in tangential direction was obvious for ramp bridges.However,the main bridge suffered only slight damage,which contained damage to rubber bearing at top of the piers and the pounding damage between main bridge and ramp bridges.更多还原