木网壳结构半刚性装配式植筋节点受力性能研究

发布时间：2018-02-26 08:33

本文关键词： 木网壳半刚性节点偏压试验弯矩-转角曲线　出处：《建筑结构学报》2017年02期 　论文类型：期刊论文

【摘要】：为研究新型装配式植筋木网壳节点的受力性能,设计并制作了两种不同截面形式的6组共计18个试件,开展偏心距分别为0、50 mm和100 mm的偏压性能试验,分析偏心距、轴向压力以及截面形式对节点半刚性特性的影响。结果表明:节点处发生核心区钢扣板局部屈曲、植筋屈服以及木材压裂等3种典型的破坏模式;偏心距大小对节点的破坏模式有影响,且与节点的初始转动刚度成反比;相同偏心距下,矩形截面试件节点的受弯承载力大于方形截面试件,但其转动延性不如后者;偏心距越小,轴力对节点初始转动刚度的增大效果越明显,初始转动刚度越大。根据试验得到的节点弯距-转角曲线,引入初始刚度系数、压力影响系数以及曲率形状系数,利用幂函数改进模型拟合得到了节点的半刚性弯矩-转角模型。对一单层半刚性节点球面木网壳进行整体荷载-位移全过程分析,发现其承载力远大于节点按铰接考虑的情况,且其跨中荷载-位移的全过程曲线发展趋势更加接近于节点刚接的网壳,整个结构具有良好的承载能力及延性。
[Abstract]:In order to study the mechanical properties of the new fabricated joints, six groups of 18 specimens with two different cross sections were designed and made. The bias performance tests of 50 mm and 100 mm eccentricity were carried out, respectively, and the eccentricity was analyzed. The influence of axial pressure and section form on the semi-rigid characteristics of joints. The results show that there are three typical failure modes: local buckling of steel buckles in the core zone, yield of planting bars and fracture of wood. Eccentricity has an effect on the failure mode of the joints and is inversely proportional to the initial rotational stiffness of the joints. Under the same eccentricity, the bending capacity of the joints with rectangular section is greater than that of the specimens with the square section, but its rotational ductility is not as good as that of the latter. The smaller the eccentricity, the more obvious the effect of axial force on the initial rotational stiffness of the joint is, and the greater the initial rotational stiffness. According to the curve of bending distance and rotation angle obtained from the test, the initial stiffness coefficient, pressure influence coefficient and curvature shape coefficient are introduced. By using the improved power function model, the semi-rigid moment-angle model of joints is obtained. The whole load-displacement process of a single-layer semi-rigid node spherical reticulated shell is analyzed. It is found that the bearing capacity is much larger than that of joints hinged. The development trend of the whole process curve of the load-displacement in the middle of the span is closer to that of the reticulated shell with rigid joints, and the whole structure has good bearing capacity and ductility.
【作者单位】：南京工业大学土木工程学院;江苏文博建筑设计有限公司;
【分类号】：TU366.203

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