Seismic responses of long segmental immersed tunnel under unfavorable loads combination
Seismic responses of long segmental immersed tunnel under unfavorable loads combination
复制标题
不利荷载组合下长管片沉管隧道地震反应
DOI：
10.1016/j.trgeo.2021.100621
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发表时间：
2021-07-16
影响因子：
5.3
通讯作者：
Chen, Zhengjie
中科院分区：
文献类型：
--
作者：
Zhang, Shaohua;Yuan, Yong;Chen, Zhengjie
为研究沉管隧道-地基系统的抗震性能，基于Anastasopoulos（2007）方法的修正模型，建立了沉管隧道-地基系统的空间非线性模型。在空间模型中，综合考虑了温度和预应力两个关键因素。从工程实际的角度出发，研究了温度荷载和预应力筋荷载对隧道抗震性能的影响。结果表明：与温升情况相比，降温荷载对节段式沉管隧道接头的变形性能和节段内力的影响更为不利。预留预应力筋对节段节点的密封性有有利影响，但对浸水节点的密封性有不利影响，且这些不利影响在降温情况下更为明显。
To investigate the seismic performance of the immersed tunnel-foundation system, a spatial nonlinear model was established based on a modified model from Anastasopoulos (2007) method. In the spatial model, two key factors including temperature and prestress are synthetically considered. From a viewpoint of engineering practice, the influences of temperature loads and prestress tendons load on the seismic performance of the tunnel were studied numerically. Results show that: compared with the case of temperature rising, temperature falling load has more adverse effects on the seismic performance of the segmental immersed tunnel with respect to the deformation behaviors of joints and internal forces of segments. Retaining prestress tendons has favorable effects on the sealing of segmental joints, but has adverse effects on the sealing of immersion joints, and these adverse effects are more obvious in the temperature falling case.