部分外包混凝土组合柱-钢梁T形连接件连接框架层间抗震机理研究

发布时间：2018-07-25 14:28

【摘要】：为研究T形连接件连接的新型卷边部分外包混凝土组合柱-钢梁组合框架层间抗震机理,按1/2缩尺设计制作了1榀组合框架中间层子结构模型试件,并进行水平低周反复荷载试验。基于试验结果,分析了组合框架中间层子结构的滞回特性、承载力、抗侧刚度退化、耗能能力和破坏模式等。结果表明:T形连接件连接实现了"小震利用摩擦耗能,中大震通过梁端屈服耗能"的设计目标;预拉对穿螺栓连接有效实现了节点域混凝土斜压带传力模式,且T形连接件的设置使梁端出现塑性铰位置外移,更好满足了"强节点弱构件"的抗震要求;试件抗侧刚度沿高度分布均匀,试件整体水平位移表现为理想的倒三角弯剪型变形模式;试件的破坏模式为中间层T形连接件端部外排螺栓附近梁截面形成塑性铰的塑性破坏机构,对应层间侧移角和节点连接转角均达到0.05 rad,超过了罕遇地震作用下层间侧移角限值1/30的要求,且试件承载力仍呈缓慢增大趋势,即结构具有良好的抗倒塌性能。
[Abstract]:In order to study the anti seismic mechanism of a new type of composite column - steel beam composite frame with T - shaped joint, 1 composite frame structure model specimens were designed and fabricated by 1/2 scale, and the horizontal low cycle load test was carried out. Based on the test results, the hysteretic characteristics of the middle layer structure of the composite frame were analyzed. The bearing capacity, the side stiffness degradation, the energy dissipation capacity and the failure mode, and so on. The results show that the T shaped connector connects the design target of "small earthquake using friction energy and the large earthquake yielding energy through the end of the beam". The pretension can effectively realize the concrete baroclinic zone mode of the nodal region, and the setting of the T shaped connector makes the end of the beam appear. It is better to meet the aseismic requirements of "strong joints and weak components", and the lateral stiffness of the specimen is evenly distributed along the height, and the overall horizontal displacement of the specimen is an ideal inverted triangular bending shear model, and the failure mode of the specimen is a plastic failure mechanism formed by a plastic hinge near the beam cross section of the end outer row bolts at the end of the middle layer T connection. The lateral displacement angle of the corresponding layer and the connection angle of the joint reach 0.05 rad, which exceeds the requirement of the interlayer shift angle limit of 1/30 under the rare earthquake action, and the bearing capacity of the specimen is still slowly increasing, that is, the structure has good anti collapse performance.
【作者单位】：苏州科技学院江苏省结构工程重点实验室;
【基金】：国家自然科学基金项目(51478286,51078247)
【分类号】：TU398.9

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