Abstract
A finite model updating method that combines dynamic-static long-gauge strain responses is proposed for highway bridge static loading tests. For this method, the objective function consisting of static long-gauge stains and the first order modal macro-strain parameter (frequency) is established, wherein the local bending stiffness, density and boundary conditions of the structures are selected as the design variables. The relationship between the macro-strain and local element stiffness was studied first. It is revealed that the macro-strain is inversely proportional to the local stiffness covered by the long-gauge strain sensor. This corresponding relation is important for the modification of the local stiffness based on the macro-strain. The local and global parameters can be simultaneously updated. Then, a series of numerical simulation and experiments were conducted to verify the effectiveness of the proposed method. The results show that the static deformation, macro-strain and macro-strain modal can be predicted well by using the proposed updating model.
Highlights
With the recent development of sensing monitoring technology, health monitoring and safety assessment for bridges have attracted increasing and extensive attention in civil engineering
The main dynamic Finite Element Model Updating (FEMU) method is based on the modal parameters of structures
These modal parameters are divided into two categories: one is based on matrix parameters and the other is based on design parameters
Summary
With the recent development of sensing monitoring technology, health monitoring and safety assessment for bridges have attracted increasing and extensive attention in civil engineering. The static measurement data have higher precision and reliability than dynamic test methods such as strain measurement Both the dynamic and static finite model updating methods are based on the monitoring data of sensors, and accelerometers and strain gauges are commonly used in structural health monitoring. With reference to their spatial disposition, sensors are classified as discrete or point sensors. Aiming at that the above bridge static and loadstatic experiment problem, present for a practical updating method to modify the finite model in static load tests of highway bridges, which is based on FEMU method that combines dynamic and static long-gauge strain responses for a finite model spatially-distributed long-gauge strain sensing. Updated FE model and the method is suitable for medium-small span bridges with simple structures
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
