鹿德瑶

摘要：为分析既有建筑增设电梯的冷弯薄壁型钢框架电梯井道的抗震性能，采用有限元法建立电梯井的抗震分析模型，考虑结点初始刚度和是否增设斜撑的影响，分析在多遇地震波和罕遇地震波作用下电梯井各楼层的响应。计算结果发现：随着结点初始刚度的减小，电梯井框架结构各楼层位移、层间位移和自振周期逐渐增大，但基底剪力和对既有建筑的作用力降低;半刚性结点有一定的耗能作用，在满足结构抗震要求时可适当考虑半刚性连接;适量增设斜撑可提高结构刚度，同时框架侧移和层间位移角明显减小。

关键词：

冷弯钢; 框架结构; 电梯井; 刚度; 抗震性能

中图分类号：TU392.1; TP391.92

文献标志码：B

Seismic performance of additional elevator shaft structure

in existing building

LU Deyao

（

School of Civil Engineering， Shandong Jianzhu University， Jinan 250101， China）

Abstract：

To analyze the seismic performance of the cold-formed thin-walled steel frame elevator shaft which is added to the existing buildings， the seismic analysis model of the elevator shaft is built by finite element method， and then the responses of each floor of the elevator shaft under the frequently occurred and rarely occurred seismic waves are analyzed， in which the influence of jont initial stiffness and diagonal brace is considered. The results show that： the floor displacement， the floor to floor displacement and the natural vibration period of the elevator shaft frame structure increase gradually with the decrease of the joint initial stiffness， but the base shear force and the force to the existing building decrease; the semi-rigid joint has a certain energy dissipation effect， so the semi-rigid connection can be properly considered while meeting the seismic requirements of the structure; the structural stiffness can be improved by adding appropriate diagonal braces， and the frame lateral displacement and the story drift ratio can be reduced at the sametime.

Key words：

cold-formed steel; frame structure; elevator shaft; stiffness; seismic performance

0 引 言

既有建筑增設电梯大多采用冷弯型钢框架结构。该结构自重轻、地震反应小、装配化程度高、施工速度快[1]，是工程设计的首选方案。

众多学者对既有建筑增设室外电梯进行研究，王军芳等[2]、向容等[3]、熊海丰等[4]和池祥[5]均对新增钢电梯与原有建筑之间的连接关系进行探讨，研究电梯井与原建筑连接时两者之间的相互影响。刘玮[6]和王建军等[7]分析加装电梯易出现的典型问题，并给出相应的解决思路。谭方兰[8]、蒋璐等[9]和刘明保等[10]研究认为，增设电梯时对原建筑物进行适当加固，可以提高整体结构的承载力和抗震能力。

虽然许多学者对既有建筑室外增设电梯的安全性展开探讨，但是关于室外增设电梯结构抗震性能的研究不多。……