双阶耗能连梁结构减震设计和应用

Earthquake-reduction design and application of double-step yielding coupling beam structure

钢筋混凝土连梁跨高比偏小容易破坏,在某实际工程中应用了一种可在小震下发生第一次屈服并且仍保持一定刚度,继而在中震和大震下发生第二次屈服的双阶耗能连梁。经过小震以及中震、大震动力时程分析,结果表明,应用双阶耗能连梁的结构与应用钢筋混凝土连梁的结构相比,其层间位移角和基底剪力以及剪力墙的性能均有提升,多遇地震下结构总地震作用降低了20%,罕遇地震下墙体更晚进入屈服,采用钢筋混凝土连梁方案的结构剪力墙抗弯屈服数量达30%左右,而双阶耗能连梁方案仅7%,从而有效保护结构。

The reinforced concrete coupling beam is easy to break because its span ratio is small. In a practical project,a kind of double-step yielding coupling beam that can yield first time under small earthquake and still maintain a certain stiffness,and then yield second time under medium earthquake and large earthquake was applied. After time - history analyses under small earthquake,medium earthquake and large earthquake,the results show that compared with the structure adopting the reinforced concrete coupling beam,the interlayer displacement angle,the base shear force and the performance of the shear wall of the structure adopting the double-step yielding coupling beam are improved. Under multiple earthquakes,the total seismic action of the structure is reduced by 20%. Under rare earthquakes,the wall enters yielding later. The shear wall of the structure adopting the reinforced concrete coupling beam scheme has bending yield of about 30%,while the shearwall of the structure adopting the double-step yielding coupling beam scheme has only bending yield of 7%,thus effectively protecting the structure.