超高层建筑整体钢平台模架体系抗风性能分析
作者简介:
张鑫鑫,工程师,E-mail:zhang_xin.xin@ foxmail. com
作者单位:
1.中交建筑集团有限公司,北京 101304; 2.中交集团绿色建筑技术研发中心,北京 101304; 3.北京交通大学土木建筑工程学院,北京 100044;4.中交建筑集团有限公司第一工程分公司,江苏南京 211103
基金项目:
∗中交集团科技研发重大项目(2021-ZJKJ-11)
摘要:
在超高层建筑建造过程中,整体钢平台模架体系抗风性能关系到结构稳定性,尤其是沿海强风区域。针对整体钢平台模架体系,通过整体风洞试验进行风荷载特性分析,并研究外挂架挡风率和试验高度的影响。采用SAP2000 软件建立模架体系整体模型,并开展风振响应动力学计算,分析结构动力特性、位移响应和加速度响应,计算得到正常施工状态和爬升状态下风振系数,并与规范值进行比较。研究结果表明,模架体系在爬升后的风力系数明显高于爬升前,体型系数在顺风向极大值分别达到 1.3(爬升前)和 1.8(爬升后);8 级风力下爬升状态位移响应高于 12 级风力下正常施工状态,爬升状态位移响应较显著;爬升后的模架体系加速度响应高于爬升前,且高外挂架挡风率下爬升前后响应值差距明显;正常施工状态对应的 12 级风和爬升状态对应的 8 级风状态下风振系数分别取为 1.3—— 1.6 和 1.4—— 1.8.

English:
During the construction of super high rise buildings, the wind resistance performance of theintegral steel platform formwork equipment is related to the structural stability, especially in the coastalstrong wind area. For the equipment, the wind load characteristics were analyzed through the integralwind tunnel test, and the effects of the wind resistance rate of the external scaffolding and the test heightof the equipment were studied. SAP2000 was used to establish the overall model of the equipment, andthe dynamic calculation of wind vibration response was carried out. The dynamic characteristics,displacement response and acceleration response of the structure were analyzed, and the wind vibrationcoefficient under normal construction state and climbing state was calculated and compared with thespecification value. The results show that the wind coefficient of the equipment after climbing issignificantly higher than that before climbing, and the shape coefficient reaches 1.3 ( before climbing)and 1.8 ( after climbing), respectively. The displacement response in climbing state under the windforce of 8 is higher than that under the normal construction state under the wind force of 12, and thedisplacement response in climbing state is more significant. The acceleration response of the equipmentafter climbing is higher than that before climbing, and the difference between the response values beforeand after climbing is obvious under the high wind resistance rate of the external scaffolding. The wind-induced vibration coefficient under the 12-level wind corresponding to the normal construction state andthe 8-level wind corresponding to the climbing state are 1.3——1.6 and 1.4——1.8, respectively.