Dynamic responses of highway bridges induced by wind and stochastic traffic loads usually exceed anticipated values, tuned mass dampers (TMDs) have been extensively applied to suppress dynamic bridge structures. In this study, a new type TMD system named pounding damper (PTMD) was designed with combination viscoelastic layer covered delimiter for impact energy dissipation. Comprehensive numerical simulations the wind/traffic/bridge coupled multiple PTMDs (MPTMDs) were performed. The...

The application of reinforced concrete (RC) beam with near-surface mounted (NSM) pre-stressed carbon fiber polymer (CFRP) plates has been increasingly widespread in civil engineering. However, debonding failure occurs easily the early loading stage because prestress change at end CFRP plate. Therefore, it is important to find reliable, convenient and economical technical means closely monitor secure bonding between concrete. In this paper, an active sensing approach for generating stress...

The dynamic responses of bridges induced by vehicles moving on poor road surfaces usually exceed those that are anticipated highway bridges, thus the tuned mass damper (TMD) was studied to suppress bridge structures. In this study, a new pounding (PTMD), which dissipates energy through between and viscoelastic layer, designed reduce traffic-induced vibration. effectiveness PTMDs for suppressing vibrations under vehicle loads first considering surface conditions. A three-dimensional model,...

When studying the vibration of a bridge-vehicle coupled system, most researchers focus on vertical bridges under moving vehicular loads. In reality, loads can also induce significant lateral vibrations high-pier bridges. This study is focused establishing new methodology considering bridge's induced by vehicles. The vehicle tire modeled as three-dimensional elementary spring model, and contact patch assumed to be rectangle. Three factors that affect forces, including slip angle, camber tires...

In this paper, a comprehensive comparative study on several existing vehicle–bridge interaction (VBI) models is presented with the aim to provide useful reference selection of vehicle and bridge when conducting VBI simulation. A simply-supported slab-on-girder highway AASHTO HS20-44 are adopted in numerical analysis. The modeled as an Euler–Bernoulli beam, grillage, plate-and-beam system solid-element system, respectively, while moving-force, moving-mass spring-damper-mass (SDM)...

The contact between a vehicle tire and the road surface has been usually assumed as single-point in numerical simulation of vehicle–bridge interacted vibrations. In reality, contacts through patch instead single point. According to some recent studies, model may overestimate dynamic amplification bridge responses due loadings. A new model, namely, multi-point is therefore proposed this paper with purpose improving accuracy results over while maintaining certain level simplicity for...

Most research studies on structural optimum design have focused single-objective optimization of deterministic structures, while little study has been carried out to address multi-objective random structures. Statistical parameters and redundancy allocation problems should be considered in optimization. In order these problems, this paper presents a hybrid method for system reliability-based (SRBDO) applies it trusses. The integrates the concepts finite element method, radial basis function...

Engineering structures are most statically indeterminate consisting of various types components and their failure modes exhibit randomness under random loads. A new adaptive support vector regression method is proposed for structural system reliability assessment. Compared with traditional regression, the involves two updating procedures to estimate limit state functions. Three verification examples involving a nonlinear function, truss bridge structure, geometrically suspended structure...

Optimum structures must have adequate resistance against external random loads. Since most truss involve a series of failure processes, it is necessary to develop system reliability analyses for the optimum design structures. In this paper, hybrid method reliability-based optimisation (SRBDO) proposed by combining genetic algorithms (GAs) and radial basis functions (RBFs) neural networks. The applied structures, then validity demonstrated through two specific examples. Detailed discussions...

In the current study, nonstationary random responses of moving wheels induced by road roughness in a time domain were obtained and treated as inputs to study vibration high-pier bridge under vehicles with variable speed. A full-scale vehicle model 12 degrees freedom was used; considered patch contact instead point surface. The vehicle-bridge coupling equations established combining motion both using displacement relationship interaction force at patches. midspan deflections caused stationary...

When studying the vibration of a bridge–vehicle coupled system, most researchers mainly focus on intact or original bridge structures. Nonetheless, large number bridges were built long ago, and them have suffered serious deterioration damage due to increasing traffic loads, environmental effect, material aging, inadequate maintenance. Therefore, effect bridges, such as cracks, vehicle–bridge system should be studied. The objective this study is develop new method for considering cracks road...

Previous vibration-based damage detection studies mostly focus on developing a more sensitive optimization function to promote the effectiveness of identification. However, few have conducted comparative analyses performance different functions. In study, changes in frequency and mode shape are applied as inputs functions for Three established using residuals, combinations modal flexibility respectively. Considering sparsity element distribution, an iterative reweighted [Formula: see text]...

The dynamic interaction of bridge-traffic system is dependent on the stochastic characteristics various parameters that are random in nature, such as surface roughness, traffic flow, and so on. It necessary to include these uncertainties analysis. In this paper, coupled vibration studied considering flows roughness. parameters, extrapolation maximal displacement mean value process, firstly presented probability Two vehicle models, one with 18 degrees freedom (DOFs) other 3 DOFs, were adopted...

Ultra-high-performance concrete (UHPC) material, a new type of cement-based composite is usually employed in the bridge engineering. The transfer and anchorage length steel strand UHPC material different from that ordinary concrete; nevertheless, few design standards are found how to anchor anchoring under normal curing. Through central pull-out test conditions protective layer thickness embedded length, load-slip curves, failure modes, bond strength 36 specimens curing were studied....

The precast segmental concrete (PSC) structures and the nano-materials based beams are widely applied to civil engineering. On other hand, it is well known that have physical effects can significantly improve properties of cement-based materials. Therefore, interface debonding performance (PSNBC) investigated in this study. Two specimens with one specimen without were prepared bonded into PSC a high strength epoxy adhesive. smart aggregates (SAs) made piezoceramic Lead Zirconate Titanate...

Experimental and numerical studies are performed to analyze a concrete bridge under moving vehicular loads considering the effects of damage cracks, stochastic traffic flows, surface roughness. Specifically, (1) crack zone in is modeled by function with three parameters, i.e. length damaged zone, magnitude damage, variation Young’s modulus material; (2) cellular automation (CA) based flow model adopted, which can capture basic features probabilistic flows using realistic rules; (3)...

In the existing vehicle-bridge coupling vibration analysis, vehicle model was mostly coupled with bridge node by interpolation methodology, therefore, it difficult to accurately consider response under condition of separation. order further study effect jumping impact on system, a which can describe process is established based designed integrated simulation platform interface contact algorithm. The effects wheel force and displacement were studied two parameters including height speed....

A new three-dimensional trans-scale crack growth model, developed from the microscale to macroscale, is presented based on concept of restraining stress zone. It aims simulate behaviors fatigue cracks in a welded joint orthotropic steel decks. In study, shape was first simplified as semielliptical surface crack, and analyzed finite-element mode considering intensity factors (SIFs). Subsequently, SIFs served controlling parameters for propagation macroscale. The proposed model can overall...

An active sensing approach using piezoceramic induced stress wave is proposed to provide monitoring and early warning for the development of interface debonding damage precast segmental concrete beams (PSCBs). Three specimens with toothed interfaces were fabricated bonded high‐strength epoxy resin adhesive form PSCBs. Smart aggregates (SAs) embedded in are used as actuators sensors. The PSCBs subjected periodic loading hydraulic jack test different degrees damage. experimental results...

The carbon fiber reinforced polymer- (CFRP-) strengthened nanomaterial concrete beam (SNCB) has been increasingly attracting a widespread attention because of the advantages using excellent properties nanomaterials to improve structural properties. An active sensing approach based on piezoceramic transducer is developed detect interfacial debonding performance CFRP-SNCB. A CFRP-SNCB specimen was fabricated and subjected periodic loading test initiate damage. Three smart aggregates (SAs)...