摘要
目的提高轻钢结构的抗风雪灾害能力,改善其抗灾性能.方法对沈阳遭受特大暴风雪袭击的某网架工程结构厂房进行检测,检测了屋面檩条变形、屋面网架下弦节点的挠度值和网架上、下弦变形区域内螺栓球节点裂缝缺陷等,并抽检了网架上、下弦杆及腹杆的不平直度.结果通过对该网架工程结构厂房设计、施工质量调查及雪灾影响的综合分析,表明该网架结构设计承载力及杆件长细比等均满足规范要求,但施工质量存在一定问题,并由于屋面雪荷载超过设计考虑50年一遇雪荷载取值,屋面支撑结构设计抗力明显考虑不足,这是导致网架结构破坏的主要原因.结论根据工程破损情况调查、检测结果、原设计施工图及该工程实际现状,提出加固处理方案.再次遭遇暴风雪袭击后,根据建议加固后的该网架结构厂房一直保持完好.
In order to increase the drifting snow disaster resistant ability of steel structure of light-weight building, a spatial grid steel structure of light-weight building which suffered a particularly heavy snowstorm in Shenyang was detected. The deformations of roof, purlins and bottom chord nodes of roof grid structure were measured, and cracks and defects of bolt-sphere nodes in deformation area of upper and down chords were detected. The design, construction quality and snow disaster influence of spatial grid steel structure of light-weight buildings were comprehensively analyzed. The results showed that designed loading capacity of the spatial grid steel structure of light-weight buildings and slenderness ratio of the members met standard re- quirements. However, there were some problems of construction quality. The loading capacity of supporting structures of roof was not enough because the actual roof snow load exceeded snow load design value con- sidering the case of one 50-year, which was the main reason of damage of the spatial grid steel structure of light-weight building. A strengthening project was proposed according to breakage condition of structure investigation, detection results, original design working drawing and actual structure condition. The spatial grid steel structure of light-weight buildings strengthened according to the suggestion maintained a good condition after suffering another particularly heavy snowstorm.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2009年第5期877-883,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
十一五国家科技支撑计划课题(2006BAJ03A02-1)
建设部科技攻关项目(2009-K3-25)
中国博士后科学基金项目(20090450423)
关键词
轻钢结构
网架
风雪灾害
安全性
检测
steel structures of light-weight buildings
spatial grid steel structure
drifting snow disaster
security
detection
