Connections to Concrete-Filled Steel Tubes
Connections to Concrete-Filled Steel Tubes
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发表时间：
1996-10
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通讯作者：
Y. Alostaz;S. P. Schneider
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作者：
Y. Alostaz;S. P. Schneider
连接到混凝土填充钢管本研究计划的目的是研究连接到混凝土填充钢管。本研究主要集中在圆形钢管的连接上，因为与方形钢管相比，圆形钢管的连接存在更多的细节设计困难。为了实现本研究的目标，研究分为三个阶段：原型框架设计和分析，有限元分析的几个连接，和六个大规模的连接标本的实验研究。在第一阶段，设计了两个原型抗弯钢框架，以满足1991年NEHRP规定。对这些框架的弹塑性性能进行了研究，并对延性要求最高的节点进行了隔离。第二阶段的研究致力于非弹性有限元分析的几个连接细节。为每个连接细节建立了三维有限元模型。分析研究中使用的参数包括：直径-塔-管壁厚比、柱上施加的轴向荷载、梁的弯矩-塔-剪力比和钢管的屈服强度。在第三阶段的研究中，制作了六个2/3比例的试件，并进行了准静态试验。连接的抗弯强度是本研究的主要关注点。分析模型和各实验试件均为T形构型。将单调载荷施加到分析有限元模型。对于测试样本，在梁端施加预定的循环位移，并对样本进行破坏测试。分析和实验结果表明，连接，专门附加到管壁表现出大的扭曲的管壁在连接附近，从而防止梁的抗弯强度的发展。使用外部膜片改善了简单的连接行为，但是，性能易受膜片几何形状的影响。当部分梁力转移到混凝土核心时，其性能得到显著改善。然而，行为的改善取决于连接细节。通过钢管混凝土连续梁是实现连续梁全塑性铰的最有效方法。
CONNECTIONS TO CONCRETE-FILLED STEEL TUBES The objective of this research program was to study connections to concrete-filled steel tubes. This research focused on the connection to circular steel tubes, because this shape presents more detailing difficulties compared to the square counterpart. To accomplish the goals of this study, the research was divided into three phases: prototype frame design and analysis, a finite element analysis of several connections, and an experimental study on six large-scale connection specimens. In the first phase, two prototype moment-resisting steel frames were designed to satisfy the 1991 NEHRP Provisions. The inelastic performance of these frames was studied, and the connections with the highest ductility demand were isolated. The second phase of the research was devoted to the inelastic fmite element analysis of several connection details. A 3-D finite element model was developed for each connection detail. The parameters used in the analytical study included: the diameter-ta-tube waIl thickness ratio, the applied axial load on the column, the moment-ta-shear ratio of the girder, and the yield strength of the steel tube. In the third phase of the research, six 2/3rd-scale specimens were fabricated and tested with the quasi-static method. The flexural strength of the connection was the primary concern in this study. The analytical models and each experimental specimen were aT-shape configuration. A monotonic load was applied to the analytical finite element models. For the test specimens, a predetermined cyclic displacement was imposed at the girder tip, and the specimens were tested to destruction. Analytical and experimental results suggest that connections which attach exclusively to the tube wall exhibit large distortion of the tube wall in the connection vicinity, thus preventing the development of the girder flexural strength. Using external diaphragms improved the simple connection behavior, however, the performance was susceptible to the geometry of the diaphragm. The behavior was significantly improved when part of the girder forces was transferred to the concrete core. However, the improvement in behavior depended on the connection detail. Continuing the girder through the concrete-filled steel tube was the most effective method to develop the full plastic hinge in the connected girder.