Abstract
The hybrid simulation (HS) testing method combines physical test and numerical simulation, and provides a viable alternative to evaluate the structural seismic performance. Most studies focused on the accuracy, stability and reliability of the HS method in the small-scale tests. It is a challenge to evaluate the seismic performance of a twelve-story pre-cast reinforced concrete shear-wall structure using this HS method which takes the full-scale bottom three-story structural model as the physical substructure and the elastic non-linear model as the numerical substructure. This paper employs an equivalent force control (EFC) method with implicit integration algorithm to deal with the numerical integration of the equation of motion (EOM) and the control of the loading device. Because of the arrangement of the test model, an elastic non-linear numerical model is used to simulate the numerical substructure. And non-subdivision strategy for the displacement inflection point of numerical substructure is used to easily realize the simulation of the numerical substructure and thus reduce the measured error. The parameters of the EFC method are calculated basing on analytical and numerical studies and used to the actual full-scale HS test. Finally, the accuracy and feasibility of the EFC-based HS method is verified experimentally through the substructure HS tests of the pre-cast reinforced concrete shear-wall structure model. And the testing results of the descending stage can be conveniently obtained from the EFC-based HS method.
Highlights
The seismic testing method is an important way to evaluate the structure nonlinear seismic performance and verify the feasibility of the structure seismic theory
The equivalent force control (EFC) method was used for hybrid simulation (HS) [47] with an implicit integration algorithm, during
This paper presents an application of the EFC for the multy degree of freedom hybrid simulation
Summary
The seismic testing method is an important way to evaluate the structure nonlinear seismic performance and verify the feasibility of the structure seismic theory. Testing method, which is named initially as the pseudo-dynamic substructure testing method, was proposed in 1969 [1] This method combines the physical test of the critical nonlinear parts of a structure and the numerical simulation of the remainder. It can effectively reduce the size of the test model and is an efficient and versatile testing tool for the large-scale structural model. Note that there are two challenges associated with the implementation of the controller for this full-scale HS method, including: (1) the complex test setup which employed four electro-hydraulic servo actuators as the horizontal loading device; and (2) the complex structural model which is asymmetric due to the asymmetric structural arrangement of the model. An experimental validation is carried out to demonstrate the efficacy of the proposed approach
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