Research On The Influence Of Construction Defects On The Performance Of A Super High-rise Steel Structur

With the booming development of steel structure buildings,many steel structure buildings with complex structures have emerged.Due to differences in processing technology,processing capacity,and limited installation technical ability,various construction defects in steel structure buildings are unavoidable during construction.These construction defects not only seriously affect the construction progress,but also pose great harm to the quality and safety of the structure.This article combines a super high-rise steel structure in Guangzhou,and conducts actual measurements on 2,498 column components with construction defects on site.At the same time,combined with the construction monitoring system,the research on the performance impact of construction defects on the structure and key components is carried out,mainly including the following aspects:(1)Based on the actual structure’s load and material constitutive properties,the method of establishing the structure model was analyzed.Meanwhile,a reasonable method for simulating construction defects was selected,and the reliability of the above content was verified through a comparison using YJK software and construction monitoring data.(2)YJK software was used to conduct static elastic analysis,elastic time history analysis,and elastic-plastic time history analysis under large earthquakes to study the impact of column footing displacement defects,giant diagonal brace axis offset,and two types of defect combinations on the performance of the structure.The corresponding impact laws were obtained.(3)YJK software was used to study the effects of the aforementioned defects and combinations on component internal forces,energy consumption,and yield sequence performance.Based on the impact of the structure,the recommended permissible defect amplitude for each construction defect was comprehensively derived.The research results show that the four amplitude levels of column footing displacement defects have little impact on the stability,anti-overturning,and anti-lateral displacement performance of the overall structure under static,small earthquake,and large earthquake conditions,and are in compliance with current specifications.However,when the column foot displacement defect reaches l/100,it leads to strength failure and instability of some components under static analysis,and for the same type of structure and component,the column foot displacement limit can be relaxed to l/500.The two amplitude levels of giant diagonal brace axis offset and defect combination have little effect on the structure and component performance under static,small earthquake,and large earthquake conditions and are within the range of current specifications.When the two construction defects are studied in combination,there is no significant "chain reaction" in performance impact and the impact amplitude is still within an acceptable range.