NUMERICAL SIMULATION OF SELF-CENTERING PRESTRESSED CONCRETE BEAM-COLUMN CONNECTION WITH WEB FRICTION DEVICES
A new type of self-centering prestressed concrete (SCPC) beam-column connection with web friction devices has been proposed. Precast concrete beams and columns are assembled and prestressed together using unbonded post-tensioned (PT) tendons to provide the self-centering capability upon unloading. Friction devices are located at the web of beam ends,and dissipating energy is realized as the beam-column interfaces open and close during earthquakes. Shop fabricated steel jackets at the beam ends and steel plates embedded in the columns are used to protect concrete from crushing when the beams rotate relative against the columns. This paper presents the numerical simulation of the SCPC beam-column connection with web friction devices,using the Open System for Earthquakes Engineering Simulation (OpenSees). Precast concrete beams and columns were modeled by using nonlinear Beam Column elements with fiber sections,and the PT tendons were modeled by using truss elements with initial forces. In particular,the gap opening /closing at the beamcolumn interface was simulated by using pairs of zero-length elements with compression-only material properties,and the energy dissipation due to friction was simulated by using a zero Length Section element incorporated with bi-directional plasticity properties. Analysis results obtained from the proposed numerical model were discussed and compared with the test results,and good agreement was observed.
Lianglong Song Tong Guo
Key Laboratory of PC &RC Structures,Ministry of Education,Southeast Univ.,Nanjing,P.R.China,210096
国际会议
厦门
英文
816-821
2011-10-28（万方平台首次上网日期，不代表论文的发表时间）