Concrete arch dams have been widely constructed worldwide, and many of these are located in areas with high seismic activity. However, strong loading poses a severe threat to concrete dams, the risk suffering damage possibility an ensuing dam break. In past decades, structural health monitoring has undergone rapid growth context track operation state under loading. fact, caused by normally exhibit nonlinear dynamic behaviors time-variable properties. To effectively identify development...

Investigating the dynamic response patterns and failure modes of concrete gravity dams subjected to strong earthquakes is a pivotal area research for addressing seismic safety concerns associated with dam structures. Dynamic shaking table testing has proven be robust methodology exploring characteristics dams. This paper details test conducted on model table. The emulation material, featuring high density, low elastic modulus, appropriate strength, was meticulously designed fabricated....

For earth-rock dams influenced by rainstorms, seepage status monitoring is very important and provides the basis for safe effective operation of dams. The most influential factors concerning are reservoir water level, precipitation, temperature, timeliness, influence level precipitation on an dam exhibits hysteretic effects. abruptly increases may exceed historically highest therein causing new deformations or even plastic deformation. Thus, permeability coefficient parts changes, we present...

Structural modal identification has become increasingly important in health monitoring, fault diagnosis, vibration control, and dynamic analysis of engineering structures recent years. Based on an traditional optimization algorithms, this paper proposes a novel sensor criterion that combines the effective independence (EFI) method with strain energy (MSE) method. Considering complex structure enormous degrees freedom (DOFs) modern concrete arch dam, quantum genetic algorithm (QGA) is used to...

The sensitivity analysis model is widely used to describe the impacts of condition parameters on structural reliability. However, classical limited small number influence and has no high prediction accuracy. Integrating response surface function - Kriging with Sobol algorithm, a revised proposed in this paper. And quantitative for reliability are achieved through combining experimental design coupling parameters, range verification, multi-body dynamics statics analysis. mainly applied large...

: In this paper, the effects of dry density, w/c ratio, and municipal solid waste incineration (MSWI) powder on multi-scale properties internal pore structure foamed concrete were studied by using a single-factor controlled experiment. It was found that an increase in density could effectively reduce porosity, leading to improvement compressive strength impermeability reduction water absorption. The strength, absorption, mainly affected porosity when ratio changed. With absorption rate...

Considering the differential settlement in junction between structure perpendicular to dike and body foundation of (called earth-rock this paper) during runtime, an experimental investigation optical fiber sensor monitoring was conducted. Based on sensing mechanism single-mode bending loss, experiment focused influence radius loss. In view characteristics junction, we designed a butterfly-type composite for device enlarge range improve sensibility sensor. research working principle...

In recognizing the pervasive nonstationarity of hydrometeorological variables, a paradigm shift towards alternative analytical methodologies is imperative for refining hydroclimatic data modeling and prediction. We introduce novel approach leveraging nonstationary Graphical Modeling Bayesian Networks (NGM-BNs) tailored applications. Demonstrated through monthly streamflow forecasting in Kashgar River Basin China, our method illuminates temporal evolution network relationships, underscoring...

Modal parameter estimation is crucial in vibration-based damage detection and deserves increased attention investigation. Concrete arch dams are prone to during severe seismic events, leading alterations their structural dynamic characteristics modal parameters, which exhibit specific time-varying properties. This highlights the significance of investigating evolution parameters ensuring accurate identification. To effectively accomplish recursive for dams, an adaptive subspace (ARS) method...

How to evaluate the seepage safety status of concrete gravity dam under function short-period heavy rainfall and possible historical extreme reservoir water level during typhoon is an important issue considering safety-monitoring. Based on analysis monitoring series foundation uplift pressure, this paper assumed influential process antecedent as a normal distribution introduced mutation factor reflect uprush feature pressure high-influential typhoon. Moreover, corresponding hysteresis days...

The concrete strength criterion is the basis of analysis and evaluation under a complex stress state. In this paper, large number multiaxial tests were carried out, many mathematical expressions criteria proposed based on geometric characteristics assumption convex function. However, rationality function limits use these criteria. particular, misjudgment will occur near failure curve surface. Therefore, paper does not assume shape in advance. By collecting experimental data using machine...

The effects of metakaolin powder (MP) on the microscopic rheological properties and macroscopic flow parameters cementitious suspension under various water–cement ratios were investigated. By analyzing changes in bonding strength coefficient water film thickness (WFT), mechanism MP can be explored. Further, effect mechanical was explained from perspective absorption kinetics hydration activity contribution rate. incorporation reduce rate spread increase compressive strength, plastic...

Temperature is one of the factors affecting safety operation concrete arch dams. To accurately reconstruct temperature field dam online based on data several typical sections, this paper proposes AdaBoost-ANN algorithm. The algorithm uses artificial neural network (ANN) to establish a training set measured and obtained by three-dimensional finite element model; these trained networks are used as weak classifiers AdaBoost Then, mapping relationship between field, reconstruction realized. case...

In this paper, the strength characteristics and erosion resistance of solid waste incineration (MSWI) powder were studied. Firstly, optimum process for preparation regenerated from MSWI bottom slag by ball milling was determined as follows: rotational speed 350 r/min, time 45 min. The activity index reached maximum when substitute content 30%. Secondly, semi-erosion method used to study variation rule mortar with different in semi-immersion salt solution. It found that higher powder, greater...

River flow regulations and thermal regimes have been altered by human-induced interventions (such as dam construction) or climate change air temperature variations). It is of great significance to adopt a well-performed data-driven model accurately quantify the impact over river water (WT), which can help understand underlying evolution mechanism operation change. This research applied Bayesian network-based (BNM), easily identify inherently stronger associated variables with target variable...

The Huai River Basin, China. This study chooses the daily flow data of and its tributaries, Shi Hong during 1959–2016. co-occurrence floods in different tributaries catchment is assessed by analyzing flood peak timing at three gauging stations located river network. What's more, parameters(estimated from 30-year scale time windows) marginal joint distributions are assumed stationary nonstationary respectively to explore how trend coincidence probability(CP) effected them. results show that,...

Abstract Recent studies in dam displacement monitoring primarily focus on single‐response or model updating using advanced techniques. Few involve the combination analysis of with other synchronized responses utilizing their characteristics. In situ strain data provide a strength‐safety perspective for monitoring. The challenge lies that estimating directly limited discrete may be misleading. This paper analyzes relationship between and global, multipoint local strains from differences load...