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The Seismic Responses Analysis of RC Frame Including Bond-Slip

Author: GaoWenSheng
Tutor: YangHong
School: Chongqing University
Course: Structural Engineering
Keywords: Reinforced concrete Frame Bond slip Nonlinear Analysis Fiber model
CLC: TU398.9
Type: Master's thesis
Year: 2008
Downloads: 293
Quote: 11
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Abstract

Modern seismic theory emphasizes the strong earthquake, the yield seismic performance of reinforced concrete frame structure to reflect the strong inelastic deformation capacity by component, that is, under the premise of ensuring the necessary carrying capacity through component stable hysteretic deformation characteristics dissipation energy input ground motion. Major energy-consuming agencies in the the beam hinge institutions and beam-column hinge institutions, non-elastic deformation is mainly concentrated in the nearby column base the framework node and the underlying (ie, the beam end plastic hinge zone and the bottom of the column plastic hinge zone). The component plastic hinge zone of deformation of two parts: ① bending deformation; corner of the ② caused by the slip member ends. Analysis model reflect the member ends nonlinear deformation degree of accuracy of the seismic response of the evaluation of the structure and the corresponding failure process is of great significance. Many researchers analyzed the impact of the intermediate nodes the longitudinal reinforcement slip on the seismic response of structures, but no one longitudinal reinforcement slip of the research underlying column bottom and edge nodes, or taking into account the framework at three positions (bottom bottom of the column, the intermediate node edge node) of longitudinal reinforcement slip on the structure of global and local seismic response. The researchers have proposed a method of analog reinforced bond slip model. One of the most commonly used is the member ends added separately consider the longitudinal reinforcement slip nonlinear rotational spring, but because of the empirical method to determine the constitutive model of nonlinear spring, and in considering changes in axial force on the slip The impact there is, therefore, a new fiber-based modeling method must overcome these difficulties. Fiber model based on the sectional units in the the member ends added a separate consideration slip zero-length modeling method can better solve the above problems. Firstly, a component-based model calibration, then this method is the introduction of a flat-framework, visits at different locations on the framework of the overall and local seismic response of longitudinal reinforcement slip law; introduction of a space frame investigated longitudinal reinforcement slip The impact of the seismic behavior. The main research content and conclusions: the calibration of the side column (framework underlying column reinforcement, anchoring conditions similar) investigated different concrete models in nonlinear beam-column element and zero-length cross-section unit given parameters simulation results. Curved corners, slip due to solid end corner simulation results were compared with the column low cyclic test data to verify the modeling method to determine the the slip material model given parameters. Select two frame side node by force and anchoring conditions cantilever specimen to conduct a comparative analysis of simulation results and experimental results verify this consider reinforced bond slip model investigated Frame Side Beam Bar The applicability and accuracy of the slip. In this paper, for the first time in the program within two o'clock loading frame intermediate node test simulation. Given anchored in the intermediate nodes beam bar anchorage in a framework of edge nodes and basic distinction within the column longitudinal reinforcement force characteristics, anchoring conditions, using intermediate nodes can represent longitudinal reinforcement slip deformation hysteresis characteristics ( Z-shaped) steel stress - slip deformation material model. This the slip material model and the fixed-parameter method based on the four node test calibration, validation. ② calibrated the reinforced slip model method introduced a plane frame structure. Were: do not consider the slip, only to consider the underlying bottom of the column longitudinal reinforcement slip, only consider an intermediate node longitudinal reinforcement slip, taking into account the intermediate node and edge node longitudinal reinforcement slip, taking into account the bottom of the column longitudinal reinforcement and node longitudinal reinforcement Slip a total of five different simulation analysis, the effects of the different positions of the longitudinal reinforcement slip on the seismic behavior. The main conclusion of the comparative analysis are: 1) consider only the bottom of the column slip there is a trend of increasing the framework of the overall reaction, so that the the three beam end at the bottom of the bending rotation increases, lower the bottom of the ground floor columns curving corner; 2) only consider the slip case of the longitudinal reinforcement of the intermediate node, the framework vertex increases the maximum displacement, the beam ends connected to the intermediate node bending angle decreases, but the bending angular superimposed at corresponding positions slip angular not consider slippage basic same node slip just changed the member ends deformation components. 3) taking into account the intermediate node and edge node longitudinal reinforcement slip, frame vertex displacement than considering only intermediate node longitudinal reinforcement slippage is even larger, but increases the amplitude decreases. Beam ends curved corners reduced. 4) taking into account the bottom of the column and node longitudinal reinforcement slip framework vertex displacement increased significantly more than the other three cases. Corresponding to only consider intermediate nodes vertical the tendons slip and consider node longitudinal reinforcement slip similar beam end bending angle decreases, but superimposed slip deformation, and does not consider the slip substantially similar. Whether the column or beam end moment - bending corner has similar characteristics: After considering The peak slip bearing capacity is slightly lower than when the slip is not considered, the maximum bending angle decreases; curved corner slip angle superimposed , its basically the same and with curved corner not consider slip, which indicates that the longitudinal reinforcement the slip change the column and beam end section of the composition of the total deformation, that is, by not considering the slip pure bending \\③ slip of the longitudinal reinforcement modeling method introduced a fortification intensity the octave multilayer civil space frame, taking into account the underlying column bottom longitudinal reinforcement and all nodes in the longitudinal reinforcement slip not consider slip contrast. The main conclusions: to consider slip, space frame still beams and columns hinge mechanism, but the number of column hinge rotation than the beam hinge multi and former. X to Y to consider slip, frame vertex displacement than not consider slip increased substantially no change in the number of plastic hinges, the layer of the ground floor columns cumulative maximum bending angle decreases, the second layer of the column cumulative corner amplification, slip on the other layer column is not obvious. Due to a lower degree of nonlinearity in the beam, so consider slipping back beam end rotation did not change significantly. In summary, the fiber model based on longitudinal member ends added separately consider the zero-length cross-section of the reinforced bond-slip effect unit model can simulate member force performance by quantifying the member ends ribs slip deformation effect on the structural member can be a more accurate assessment of member various deformation of the composition ratio, to improve the accuracy of the model of the fiber.

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