Development of High Reliability Steel Structural System Using Structural Joints as Energy Dissipating Elements against Strong Earthquake

建议采用螺栓连接的钢结构体系，以确保结构节点施工的稳定质量和框架的抗震性能。宽翼缘梁柱采用高强螺栓连接，并采用屈曲约束肘撑阻尼器。为了实现该系统，进行了连接的基本测试。最后，对带有膝支撑阻尼器的2层足尺无焊接结构框架进行了试验。本文的主要结论如下：1）提出了节点单元的构造和肘杆阻尼器的屈曲约束方法。根据本文提出的方法，设计制作了足尺试验节点，并进行了加载试验。2）对该结构体系进行了足尺梁柱节点加载试验。试验研究了节点单元的弹性刚度、结构的屈服极限和倒塌极限等基本力学性能。3）提出了一种有效抑制两端与柱连接的肘形支撑梁侧向屈曲的方法，并通过试验验证了该方法的有效性。提出了梁的屈曲约束设计方法。4）提出了梁的刚度和强度分析方法。通过地震反应分析，验证了简化方法的准确性; 5）以某建筑为例，与普通抗弯框架进行了结构性能和造价的比较; 6）通过足尺试验，验证了该结构体系具有良好的结构性能和变形能力。

A steel structural system with bolted connections are proposed to produce advantages on the steady quality assurance related to the construction work of the structural joints and the seismic resistance of the frames against strong earthquakes. Wide-flange beams and columns are connected by high strength bolts using buckling restrained knee brace dampers. In order to actualize this system, the basic tests of connections were conducted. Finally, 2 story full scale frame of weld-free structure with knee brace dampers were tested. Concluding remarks obtained are summarized as follows :1)The configuration of joint elements and the buckling restraining method for knee brace dampers are indicated. According to the proposed procedures, the full-scale experimental connections for loading tests are designed and fabricated.2)Loading tests for full-scale beam-column subassemblies of the proposed structural system are conducted. The fundamental mechanical properties, namely, the elastic stiffness of joint elements, the yield limit and the collapse limit of structures are experimentally inspected.3)The effective restraining method against the lateral buckling of a beam which is connected to the columns at the both ends by the knee brace damper system is suggested and its effectiveness are experimentally confirmed. The design procedures for the buckling restraining of the beam is indicated.4)The analytical method of the stiffness and the strength of the systems are indicated. Accuracy of the simplified method is confirmed through the earthquake response analysis.5)An example of a structural design for a building is shown and the structural performance and the cost for construction are compared with an ordinary moment resisting frame.6)From the full scale test, it is confirmed that the structural system has the high quality of structural performance and the deformation capacity.