Sensitivity Analysis Of Modeling Parameters For OpenSEES Based On Frame Blind Test

The OpenSEES is open structure nonlinear analysis software collecting more recent research findings, which has been received widespread concerns from researchers and engineerings. Parameters of model and material for structure modeling have to be defined artificially. In order to verify how to affect simulation accuracy by parameters, model parameters sensitivity analysis is conducted with pseudo-static test data of middle column and joint from the Tsinghua University. The correction coefficient Kxy of the simulation and the test is used to evaluate the accuracy of simulation results. The main work is as follows:(1) The Beam with Hinges Element is adopted to model the column. The results show that the hinges length Lp and the strength enhancement coefficient K of the core concrete caused by stirrup constrains have obvious influence on simulation results. The recommended value of Lp and K are given.(2) The Displacement-Based Beam-Column Element is adopted to model the column. The results show that numbers of integration points and concrete fibers are not sensitive to simulation results when the displacement-based beam-column element is used. Comparison with numbers of integration points and concrete fibers, numbers of elements are better sensitive to the results. When the numbers of elements are five and integration points are between five and seven, the simulation accuracy can be improved well.(3) The Beam-Column Joint Element is adopted to model the joint of beam and column. The results show that the bond strength of bar slip component has a great influence on the simulation results, and it is recommended to select strong. The shear spring component of the interface in the joint model has little influence on the simulation results.