桩基梁式多侧墙渡槽抗震可靠度研究

Research of Aseismic Reliability of Pile Foundation Beam Multi-flank Wall Aqueduct

将桩基梁式多侧墙预应力渡槽分解为槽身部件、槽身、槽身+槽墩等力学研究对象,对每一研究对象分别采用拟静力法、底部剪力法、振型分解反应谱法及Housner方法,建立地震作用模式及地震可靠度计算模型,以不同模式下结构可靠指标β的均值来评价结构的抗震可靠性,计算了南水北调中线渡槽工程实例。结果表明:在水平地震影响下,槽身在槽墩上沿纵、横向的抗滑稳定是渡槽工程抗震安全最薄弱的两个方面,且横向比纵向更为不利;在中震影响下,渡槽的抗震可靠度满足规范要求,但抵御大震能力显著不足。

Disassembled the pile foundation beam multi-flank wall prestressed aqueduct into mechanics research object such as aqueduct body parts （lateral）, aqueduct body parts （longitudinal）, aqueduct body with pile （lateral） and aqueduct body with pile（longitudinal）, used Pseudo-Static method, Bottom Shear method, Vibration Mode Decomposition Response Spectrum method and Housner method for each object of study, establishing seismic action mode and seismic reliability calculation model, evaluating the aseismic reliability with different mode structure reliability index calculated the South- to-north Water Transfer Project example. Results show that the lateral and longitudinal sliding stability of aqueduct body in slot pier are the weakest two aspects in the aqueduct aseismatic engineering, and lateral sliding stability more adverse than longitudinal; under the influence of the middle seismic, aqueduct aseismic reliability satisfy the standard requirements, but the ability of big earthquakes resistance is significant deficiencies.