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按塑性理论分析钢筋混凝土双向板,一般采用近似法或文献[1]中的方法.近似法假定板的斜塑性铰线与板边夹角为45°,而与板的支承情况无关,这显然与实际情况不符.文献[1]中的方法可以说是精确法,该法使用极限平衡原理,并用求极值的方法确定最不利塑性铰线位置,即板的破坏图形.从其计算公式可以看出,塑性铰线位置与板的支承情况
Analyze the two-way reinforced concrete slab according to the plastic theory, generally adopt the approximate method or the method in [1]. The approximate method assumes that the angle between the oblique plastic hinge line and the edge of the slab is 45°, which is independent of the support conditions of the slab. This is inconsistent with the actual situation. The method in [1] can be said to be an exact method that uses the principle of limit equilibrium and uses the method of seeking extremum to determine the position of the most unfavorable plastic hinge line, ie the destruction pattern of the plate. From its calculation formula can be It can be seen that the position of the plastic hinge and the support of the plate