Analytical solutions of nonlocal coupled thermoelastic forced vibrations of micro-/nano-beams by means of Green's functions

A novel tension estimation approach for elastic cables by elimination of complex boundary condition effects employing mode shape functions

Since cables are the critical structural components for ensuring the overall structural integrity and safety of cable‐stayed bridges, the portable and rapid cable force measurement has a v...

https://onlinelibrary.wiley.com/doi/pdf/10.1111/mice.12557

Cable force estimation of a long‐span cable‐stayed bridge with microwave interferometric radar

Suspenders are critical force transmission components in suspension and arch bridges, which connect the girder to the main cable/arch. Field inspection indicates that short suspenders at th...

Corrosion Fatigue Analysis and Reliability Assessment of Short Suspenders in Suspension and Arch Bridges

Mode shape-aided tension force estimation of cable with arbitrary boundary conditions

A highly precise frequency-based method for estimating the tension of an inclined cable with unknown boundary conditions

Determining the dynamic amplification factor of multi-span continuous box girder bridges in highways using vehicle-bridge interaction analyses

This study investigated the traffic-induced stresses in the steel deck of a suspension bridge on the Yangtze River, taking into account the dependence of Young’s modulus of asphalt pavement on temperature. In particular, the stress spectra of local areas in the steel deck were studied. On the basis of the massive traffic data collected by a bridge toll system over one month, traffic composition and the vehicle load were statistically analyzed, and then a random traffic flow model that reflected the statistical characteristics of actual traffic flow, was generated. Through a bridge dynamic analysis of the random traffic flow model, a segment of the steel box girder which experiences the greatest stress was selected. The local stress variation and the stress spectrum under traffic flow were analyzed using a finite-element model (FEM). In the FEM analysis process, the impact of the temperature on mechanical properties of the asphalt pavement was considered. The results show that the middle segment of the main span has the largest moment amplitude. In addition, it was observed that the variation of Young’s modulus of asphalt pavement resulting from temperature change can significantly affect the stress of the steel box girder and the stress spectrum at different local areas in steel deck.

Research on Stress Spectrum of Steel Decks in Suspension Bridge Considering Measured Traffic Flow

The present study investigated the effect of the correlation of the measured road roughness profiles corresponding to the left and right wheels of a vehicle on the vibration of a vehicle-bridge coupling system. Four sets of road roughness profiles were measured by a laser road-testing vehicle. A correlation analysis was carried out on the four roughness samples, and two samples with the strongest correlation and
weakest correlation were selected for the power spectral density, autocorrelation and cross-correlation analyses. The scenario of a three-axle truck moving across a rigid-frame arch bridge was used as an example. The two selected road roughness profiles were used as inputs to the vehicle-bridge coupling system. Three different input modes were adopted in the numerical analysis: (1) using the measured road roughness profile of the left wheel for the input of both wheels in the numerical simulation; (2) using the measured road roughness profile of the right wheel for both wheels; and (3) using the measured road roughness profiles corresponding to left and right wheels for the input corresponding to the vehicle‟s left and right wheels, respectively. The influence of the three input modes on the vibration of the vehicle-bridge system was analyzed and compared in detail. The results show that the correlation of the road roughness profiles corresponding to left and right wheels and the selected roughness input mode both have a significant influence on the vibration of the vehicle-bridge coupling system.

Vibration of vehicle-bridge coupling system with measured correlated road surface roughness

Long-span cable-stayed bridges exhibit some features which are more critical than typical long span bridges such as geometric and aerodynamic nonlinearities, higher probability of the presence of multiple vehicles on the bridge, and more significant influence of wind loads acting on the ultra high pylon and super long cables. A three-dimensional nonlinear fully-coupled analytical model is developed in this study to improve the dynamic performance prediction of long cable-stayed bridges under combined traffic and wind loads. The modified spectral representation method is introduced to simulate the fluctuating wind field of all the components of the whole bridge simultaneously with high accuracy and efficiency. Then, the aerostatic and aerodynamic wind forces acting on the whole bridge including the bridge deck, pylon, cables and even piers are all derived. The cellular automation method is applied to simulate the stochastic traffic flow which can reflect the real traffic properties on the long span bridge such as lane changing, acceleration, or deceleration. The dynamic interaction between vehicles and the bridge depends on both the geometrical and mechanical relationships between the wheels of vehicles and the contact points on the bridge deck. Nonlinear properties such as geometric nonlinearity and aerodynamic nonlinearity are fully considered. The equations of motion of the coupled wind-traffic-bridge system are derived and solved with a nonlinear separate iteration method which can considerably improve the calculation efficiency. A long cable-stayed bridge, Sutong Bridge across the Yangze River in China, is selected as a numerical example to demonstrate the dynamic interaction of the coupled system. The influences of the whole bridge wind field as well as the geometric and aerodynamic nonlinearities on the responses of the wind-traffic-bridge system are discussed.

Nonlinear dynamic performance of long-span cable-stayed bridge under traffic and wind

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