【摘要】 强震作用下排架式渡槽结构易发生损伤开裂破坏,使结构整体抗震性能发生改变。基于混凝土塑性损伤本构模型,采用等效弹簧模拟桩-土之间的动力相互作用及温降法模拟槽身三向预应力钢筋作用,应用时域分析法对某大型排架式U型渡槽在强震作用下的动力响应规律及损伤破坏发展过程进行分析,得到强震作用下排架式渡槽的破坏模式及抗震薄弱部位,研究排架式渡槽结构的整体抗震特性。研究表明,在强震作用下结构损伤破坏较大区域主要集中于下部排架盖梁、连系梁与排架柱交接的部位,可能出现混凝土开裂现象,是该排架式渡槽结构的抗震薄弱环节,而槽身整体破坏性较小。对于地震烈度较高地区的排架式渡槽结构,应重点关注下部支撑结构的抗震安全性。更多还原

【Abstract】 The bent-type aqueduct structure is prone to injury under strong earthquakes,and the structure’s overall anti-seismic performance changes.Based on the concrete plastic damage constitutive model,the equivalent spring model was applied to stimulate the SSI while a temperature drop process was applied to stimulate the effect of pre-stressed steel bars in the aqueduct.In addition,the overall anti-seismic performance of bent-type aqueduct structure was studied through analyzing the dynamic response law and damage development process of a large bent-type U-shaped aqueduct under strong earthquakes by applying time-domain analysis.The research results indicated that under strong earthquakes,the bent frame joints are the anti-seismic weak parts of aqueduct,while overall damage of groove body is less likely.For bent-type aqueduct structures which are located in areas with high seismic intensity,main attention should be paid to the anti-seismic safety of the lower part of the support structure.更多还原