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双阶耗能连梁结构减震设计和应用
张坚
摘 要

(上海建筑设计研究院有限公司, 上海 200041)

[摘要]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。

[关键词]联肢剪力墙; 钢筋混凝土连梁; 双阶耗能连梁; 减震设计

中图分类号:TU318文献标识码:A文章编号:1002-848X(2019)04-0129-05

 

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

Zhang Jian

(Shanghai Architectural Design & Research Institute Co., Ltd., Shanghai 200041, China)

Abstract: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.

Keywords:coupled shear wall; reinforced-concrete coupling beam; double-step yielding coupling beam; earthquake-reduction design

 

作者简介:张坚,学士,高级工程师,一级注册结构工程师,英国特许工程师,Email:zhangjian@siadr.com.cn。

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