循环周转型临时看台支承架体重复对比试验研究  

Repeated Comparative Experimental Study of Circular Turnover Type Temporary Stand Support Frames

作　　者：张艳霞 邵立鑫[1] 张爱林 李杨龙 程啸天 ZHANG Yanxia;SHAO Lixin;ZHANG Aiin;LI Yangong;CHENG Xiaotian(School of Civil and Transportation Engineering,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Collaborative Innovation Center of Energy Conservation&Emission Reduction and Sustainable Urban-Rural Development in Beijing,Beijing 102627,China;Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials,Beijng University of Civil Engineering and Architecture,Beijing 100044,China)

机构地区：[1]北京建筑大学土木与交通工程学院,北京100044 [2]北京节能减排与城乡可持续发展省部共建国家协同创新中心,北京102627 [3]北京建筑大学工程结构与新材料北京市高校工程研究中心,北京100044

出　　处：《建筑钢结构进展》2024年第9期24-33,共10页Progress in Steel Building Structures

基　　金：国家重点研发计划项目(2021YFF0306300);长江学者和创新团队发展计划项目(IRT_17R06)。

摘　　要：为积极响应国家走绿色可持续发展道路的号召,北京冬奥会采用了大量支承架体用于临时看台或舞台的搭建。为研究赛后的临时看台支承架体能否安全合理地被再次使用,以索氏不锈钢插销式节点临时看台支承架体为研究对象,设计并制作了一个横纵均为2跨且跨度为2 m的足尺模型试件,共进行了两次试验,即在首次水平加载试验结束后,将该试验架体搭建在室外,经历长时间严寒风雪后再重复做一次试验,重点对比分析了其在4种不同恒载与水平荷载组合作用下的整体结构变形模式、力学性能及典型位置峰值应变等。研究结果表明:在恒载为0.0 kN∙m^(-2)、0.5 kN∙m^(-2)、2.0 kN∙m^(-2)和3.5 kN∙m^(-2)的工况下,两次试验中架体结构的试验现象及变形模式基本相同,力学性能差值在5%以内,典型位置处峰值应变差值在10%以内,累计损伤较小。两次试验结束后结构均未出现明显损伤,仍具有较大安全储备,所以在经历长时间的严寒风雪后,临时看台支承架体仍可以被重复使用。研究结果可为北京冬奥会临时设施架体的赛后利用等研究提供参考。The Olympic Winter Games Beijing actively responded to the call to take the road of green and sustainable development,using a large number of supporting frames for the construction of temporary stands or stages.In order to study whether the temporary stand support frame after the competition can be safely and reasonably used again,this paper takes the temporary stand support frame of the Soxhlet stainless steel bolt joint as the research object,designs and manufactures a full-scale model with 2 spans in both longitudinal and transverse directions and a span of 2 m,and carries out two tests.After the first horizontal loading test,the test frame was built outdoors and repeated after exposed in the long-term severe cold,wind and snow environment.The test was repeated again,and the overall structural deformation mode,mechanical properties and peak strain at typical positions under four different combinations of dead load and horizontal load were compared and analyzed.The results show that under the condition of dead load of 0.0 kN∙m^(-2),0.5 kN∙m^(-2),2.0 kN∙m^(-2) and 3.5 kN∙m^(-2),the experimental phenomena and deformation modes of the two test frame structures are basically the same,the difference of mechanical properties is within 5%,the difference of peak strain at typical positions is within 10%,and the cumulative damage is small.After the two tests,there was no obvious damage to the structure,and there was still a large safety reserve.Therefore,after experiencing severe cold,wind and snow for a long time,the temporary stand support frame can still be reused.The research work in this paper can provide some reference for the post-competition utilization of the temporary facilities of the Olympic Winter Games Beijing.

关 键 词：北京冬奥会 临时看台支承架体 水平加载 重复对比试验 索氏不锈钢 

分 类 号：TU391[建筑科学—结构工程]