钢桁架施工监测成果的设计解读

Interpretation on design of steel truss construction monitoring results

为监控施工质量,保证施工安全,对内部容纳多种商业业态的大跨度、大悬挑钢桁架,从施工卸载、楼屋面加载等阶段进行全方位、全过程监测。采用换算为名义应力的方法,对获得的杆件应力增量监测数据进行数据处理,为分析研究提供便利条件;采用监测值与模拟值的对比和同类杆件的监测值彼此对比等分析方法判断监测数据的可信度;按照名义应力监测值的变化规律推算杆件在荷载最不利工况组合作用下的内力,以评估构件在正常使用状态下的安全性。通过对监测成果的分析解读,为钢桁架的验收和安全使用提供有效的判断依据,同时留置6个长期监测点实时监测关键杆件应力,在掌控结构使用阶段受力信息的同时,验证分析方法的可靠性。

In order to monitor the construction quality and ensure the construction safety,the large-span and large-cantilever steel trusses with a variety of commercial formats were monitor in all directions and in the whole process from the stages of construction unloading and floor and roof loading.The method of conversion to nominal stress was used to process the obtained monitoring data of the stress increment of the member,which provided convenience for the analysis and research;the reliability of the monitoring data was judged by the comparison between the monitoring value and the simulation value and the comparison between the monitoring values of the same kinds of members;according to the change rule of nominal stress monitoring value,the internal force of members under the most unfavorable load combination was calculated to evaluate the safety of members in normal use.Through the analysis and interpretation of the monitoring results,it could provide an effective judgment basis for the acceptance and safe use of the steel truss.At the same time,six long-term monitoring points were reserved to monitor the stress of the key members in real time.The reliability of the analysis method was verified while controlling the stress information of the structure in the use stage.