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根据对所得到的试验资料的统计,目前国内外共有300多个钢筋混凝土框架试验节点,即梁、柱、节点三者结合在一起的组合件(见图1.b),一些国家以这些试验资料为依据,建立了严格的设计方法(包括柱端抗弯强度,节点抗剪强度及钢筋锚固构造)。根据这些设计方法设计的节点,普遍用钢量多,难于施工。建立设计方法的依据是,在保证柱端抗弯强度的前提下,对试验节点梁端反复加载,使梁、柱产生极大变形,并使节点区产生严重的剪切破坏及锚固破坏。人们对这种试验方法及其结果可能会提出下列问题:
According to the statistics of the experimental data obtained, there are currently more than 300 reinforced concrete frame test nodes at home and abroad, namely the combination of beams, columns and joints (see Figure 1.b). Some countries use these tests. Based on the data, a rigorous design method was established (including column end bending strength, joint shear strength and steel anchorage structure). Nodes designed according to these design methods generally use more steel and are difficult to construct. The basis for establishing the design method is that under the premise of guaranteeing the column end bending strength, the beam end of the test node is repeatedly loaded, so that the beam and the column are greatly deformed, and severe shear failure and anchorage failure are caused in the joint area. People may ask the following questions about this test method and its results: