塑性法计算框架结构层间弹塑性位移

CALCULATION OF ELASTOPLASTIC DISPLACEMENT BETWEEN LAYERS OF FRAMED STRUCTURE BY PLASTIC METHOD

目前 ,我国建筑防倒塌验算是通过对罕遇地震作用下对薄弱层的层间弹塑性位移的验算来实现的。层间弹塑性变形是通过弹塑性时程分析和简化计算方法进行的。前者计算费机时 ,没能得到普遍应用 ,后者应用存在局限性。通过对框架结构最危险的倒塌模型———柱铰形侧移机构 ,对薄弱层的塑性变形通过塑性分析的虚功原理推求框架结构柱铰形侧移的计算方法 ,应用此计算方法对大连市两栋框架结构进行计算 ,其结果与弹塑性时程分析法结果基本相符。

At present, the checking computation of collapse preventing performance of architecture is realized by calculating the plastic displacement between layers of the unsubstantial layer under the action of the rarely met earthquake. And the plastic sway between layers is calculated by analysis of plastic history and the simplified calculation method. The former method takes too much time and was not used widely, while the latter has some limitation in practical use. This article deduced the calculation method of column hinge sway in framework structure by analyzing plastic sway of the column hinge sway mechanism—the most dangerous collapse model in the framework structure with the virtual principle of plastic analysis, and calculated two framework structures and the results is almost the same as those calculated by method of plastic analysis.