钢结构高效装配减震体系拟动力和静力试验研究

针对装配式钢结构中广泛应用的钢框架箱型柱全熔透焊接的传统连接技术存在热影响区力学性能差、施工效率低、人工成本高、污染环境等关键问题，课题组提出芯筒式全螺栓连接节点，结合中间柱摩擦阻尼器减震技术，构建一种高效装配式减震钢结构体系。以工程实例为原型结构，对其中一榀进行0.7倍缩尺，对钢结构高效装配减震体系试验框架进行拟动力和拟静力试验研究。研究表明在El-Centro波8度(0.2g)多遇、设防、罕遇和8度(0.3g)罕遇地震作用下，试验框架表现出良好的刚接性能，拟动力试验结束后基本无塑性损伤。拟静力试验大变形情况下，试验框架滞回曲线呈双线性，结构主要通过阻尼器进行耗能，试验结束时，除柱脚应变较大外，节点域以及梁和中间柱位置几乎保持弹性状态。结果表明钢结构高效装配减震体系节点有良好的受力性能，中间柱型阻尼器发挥了耗能作用。

Experimental study on high-efficient assembled steel structure system with#br# intermediate column containing friction dampers

In order to overcome the problems of box column in field welding, the high-efficient assembled system of steel structure is constructed by using the box shaped column joint composed of core sleeve, bolts and the intermediate column containing friction dampers. Pseudo-dynamic and quasi-static tests were conducted on a model frame of high-efficient assembling and damped system of steel structure with a scale of 0.7. Research results indicate that under the action of El-Centro seismic record corresponding with 8 degree (0.2 g) frequent occurrence, fortification, rare earthquake and 8 degree (0.3 g) rare earthquake, the tested frame presents favorable rigid connecting performance and shows no obvious plastic damage after pseudo-dynamic test. Under the large deformation quasi-static test, the hysteretic curves of the testing frame shows a bilinear shape and the energy consumption of the structure is mainly achieved by friction dampers. At the end of the test, the joint zone, the frame beam and the intermediate column were basically in an elastic state except that the large strain occurred at the column foot. The results show that the joint stiffness of the steel structure has good mechanical properties, and the intermediate column damper plays the role of energy dissipation.