Hysteretic effect considered monitoring model for interpreting abnormal deformation behavior of arch dams: A case study. Issue 10 (17th July 2019)

• Record Type: Journal Article
• Authors: Wang, Shaowei; Xu, Yingli; Gu, Chongshi; Bao, Tengfei; Xia, Qun; Hu, Kun
• Is Part Of: Structural control and health monitoring. Volume 26:Issue 10(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-07-17
• Subjects: abnormal interpretation -- cause analysis -- deformation behavior -- HHST model -- hysteretic effect -- Jinping I arch dam; Structural engineering -- Periodicals; Structural control (Engineering) -- Periodicals; Automatic data collection systems -- Periodicals; Detectors -- Periodicals; 624.17
• DOI: 10.1002/stc.2417
• Languages: English
• ISSNs: 1545-2255

Abstract

Summary: Deformation is the most intuitive reflection of comprehensive behavior of concrete dams; it is of great significance to predict and interpret the deformation observation data for dam health monitoring. The world's highest concrete dam, Jinping I arch dam in China, was discussed in this paper. Aiming at its annually measured continuous growth phenomenon of dam body deformation towards the downstream direction when reservoir keeps stable at the normal water level of 1, 880.0 m, influences of cement hydration heat‐induced temperature rise effect, valley contraction, and dam material creep on deformation behavior of this dam were estimated by finite element method (FEM) and the measured data. Combined with the results of the hydraulic, seasonal, and time (HST) model, the abnormal deformation behavior was detected to be jointly caused by the hysteretic hydraulic deformation and the ambient temperature drop effect. Subsequently, to solve the deficiency that the traditional HST model cannot reasonably explain this measured deformation behavior, a hysteretic hydraulic component was introduced into the HST model, and a special hydraulic, hysteretic, seasonal, and time (HHST) model was proposed. Based on the numerical simulation of viscoelastic FEM and the constrained least square method, the newly added component was represented by a continuous piecewise fitting function, with model factors of previous relative water depth and cumulative days of the current water level stage. HHST model results of Jinping I arch dam show that the measured abnormal displacement increment of dam body is 70% caused by the ambient temperature drop effect and 30% caused by the viscoelastic hysteretic hydraulic deformation.