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对7度、8度、9度区的规则RC框架结构进行非线性动力分析,数值模型分为在各层柱底加入施工缝模型的“带缝框架”和不考虑施工缝影响的“整浇框架”两种。通过对比结构的顶点最大位移、层间位移角、塑性铰分布规律和关键构件的反应等研究施工缝对框架结构抗震性能的影响程度。结果表明,在多遇地震下,结构仍处于弹性状态,施工缝对结构的顶点位移及层间位移角等影响不大。在罕遇地震下,随着地震动增大,结构进入非线性,施工缝的影响逐渐凸显,会使顶点位移及层间位移角明显增大。施工缝使柱端更容易出现塑性铰,更易形成“强梁弱柱”的柱铰破坏模式。在罕遇地震下对结构进行非线性数值分析时应重视施工缝的影响作用。
Nonlinear dynamic analysis of the regular RC frame structure in 7 degree, 8 degree and 9 degree zone is carried out. The numerical model is divided into “stitched frame ” with construction joint model at the bottom of columns and “Pouring frame ” two. The influence of construction joints on the seismic behavior of frame structures is studied by comparing the maximum displacement of vertices, the displacement angle between layers, the distribution law of plastic hinge and the response of key members. The results show that under earthquake, the structure is still in elastic state, and the construction joints have little effect on the displacement of the structure and the displacement angle between layers. Under rare earthquakes, with the increase of ground motions, the structure becomes non-linear, and the influence of construction joints gradually becomes prominent. As a result, the displacement of apex and the displacement angle between floors increase obviously. Construction joints make the column ends more prone to plastic hinge, easier to form “strong beam weak column ” column hinge failure mode. In the rare earthquakes under the structure of nonlinear numerical analysis should pay attention to the impact of construction joints.