滇中引水工程场区具有地震频发、设防烈度高的特点,为保证其渡槽设施在地震下的安全性,以滇中引水工程某高架大跨梁式渡槽为研究对象,分析其抗震性能。通过大型通用有限元分析软件ABAQUS建立了考虑流固耦合作用的单跨渡槽模型,依据场区地质条件选取地震动,对盆式橡胶支座、铅芯橡胶支座及摩擦摆支座渡槽进行弹塑性动力时程分析。结果表明,隔震支座渡槽的槽身最大位移平均比盆式橡胶支座渡槽降低25.5%,最大墩底弯矩平均降低24.3%,隔震性能良好。盆式橡胶支座比隔震支座渡槽的损伤严重,槽身与槽墩的损伤部位分别为槽底支座处、槽壁变截面处及墩底。空槽工况下,铅芯橡胶支座渡槽的最大位移比满槽增加10.4%,最大墩底弯矩降低21.4%;摩擦摆支座最大位移及墩底最大弯矩分别降低20.9%及32.2%。铅芯橡胶支座的隔震周期受上部质量影响大,而摩擦摆支座的隔震周期与上部质量无关,因此摩擦摆支座更适用于渡槽结构。
Abstract
The site of the Central Yunnan Water Diversion Project is earthquake-prone with high seismic intensity. To ensure the safety of aqueduct facilities against earthquakes, the seismic performance of an elevated large-span beam-supported aqueduct of the Central Yunnan Water Diversion Project was analyzed. ABAQUS was utilized to establish a model of single-span aqueduct in consideration of fluid-structural interaction. Ground motion inputs were selected based on the site’s geological conditions. The elastic-plastic time-histories of aqueducts with pot-type elastomeric pad bearings (PEPBs), lead rubber bearings (LRBs), and friction pendulum bearings (FPBs) were analyzed. Results demonstrate that aqueducts with isolation bearings exhibit a 25.5% lower maximum displacement and a 24.3% smaller maximum bending moment at bottom of the pier compared to aqueducts with PEPBs. Thus, the seismic isolation performance of isolation bearings surpasses that of PEPBs, and the damages in PEPB aqueducts are more severe, primarily concentrated in the areas where the aqueducts come into contact with the bearing and at variable section of the aqueduct wall as well as at the bottom of the piers. Regarding empty aqueducts, those with LRBs experience a 10.4% larger maximum displacement than full aqueducts, accompanied by a 21.4% smaller maximum bending moment at pier bottom. On the other hand, aqueducts with FPBs demonstrate a 20.9% smaller maximum displacement and a 32.2% smaller maximum bending moment at pier bottom compared to full aqueducts. The seismic isolation period of LRBs is significantly affected by the mass of upper structure, while the period of FPBs remains independent of the mass of upper structure. Considering these factors, FPBs are found to be more suitable for aqueducts.
关键词
渡槽 /
有限元模拟 /
弹塑性时程分析 /
隔震支座 /
抗震性能
Key words
aqueduct /
finite element analysis /
elastic-plastic time history analysis /
seismic isolation bearing /
seismic performance
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基金
云南省重大科技专项(202102AF080001)
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