钢筋混凝土框架顶层角节点在负弯矩作用下的静力性能研究

本文以混凝土强度、纵向受拉钢筋配筋率以及纵向受拉钢筋在节点内的弯弧半径为主要变量,通过15个足尺梁柱组合件对非震区钢筋混凝土框架中通常只受负弯矩作用的顶层角节点的静力性能进行了试验研究,并对节点的受力性能进行了二维非线性有限元模拟分析,从中了解了这类节点在不同阶段的受力特点以及可能发生的损坏或破坏形态。最后根据试验及分析结果给出了根据受拉钢筋配筋率确定节点内受拉钢筋弯弧半径的公式以及相应的设计建议。

BEHAVIOR OF THE REINFORCED CONCRETE FRAME CORNER JOINTS SUBJECTED TO CLOSING LOADS

In this paper, experimental results on the tests of 15 full-scale reinforces concrete frame corner joints subjected to closing loads arereported. The primary variables are the compressive strength of eoncrete, thesteel ratio and the ratius of main bar bend. In order to investigate the stressdistributiens of the concrete in the cores of the joints, a nonlinear finiteelement analysis of the frame corner jonts is carried out. Possible damage andfailure modes of the frame corner joints are discussed herein. Based on observedand computed results, the formulae in terms of the steel ratio and the ratius ofmain bar bend and the corresponding useful recommendations are made for thedesign of the frame corner joints.