大跨度混凝土钢筋框架梁挠度超限研究  

RESEARCH ON DEFLECTION OVERRUN OF LONG SPAN REINFORCED CONCRETE FRAME BEAM

作　　者：张玉明[1,2] 尚彦宾[3] 边广生 陈国斌[2] ZHANG Yu-ming;SHANG Yan-bin;BIAN Guang-sheng;CHEN Guo-bin(School of Civi Engineering,Shandong Jianzhu University,250101,Jinan,China;Shandong Jianzhu University Engineeing Appraisal and Reinforcement Research Institute Co,Ltd,250001.Jinan,China;China Railway No.10 Bureau Group Co,Ltd.265500,Yantai,Shandong.China)

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东建筑大学工程鉴定加固研究院有限公司,济南250014 [3]中铁十局集团城建工程有限公司,山东烟台265500

出　　处：《建筑技术》2024年第3期322-324,共3页Architecture Technology

摘　　要：根据大量的工程实践,大跨度钢筋混凝土框架梁由于设计不合理引起大跨度梁超限的工程案例很少,大多数是施工原因导致挠度超限。以某工程挠度超限的大跨度钢筋混凝土梁为例,根据设计资料和现场检测资料,从设计和施工两方面,利用数值计算和有限元模拟,验证分析大跨度钢筋混凝土框架梁挠度超限的原因。验证分析表明,梁板混凝土实际浇筑厚度超限与梁模板起拱高度不足可能引起梁挠度增加。当梁下立杆稳定承载力不足时,梁也易随立杆屈曲变形产生较大挠度。According to a large number of engineering practices,there are few engineering cases where large-span reinforced concrete frame beams exceed the limit due to unreasonable design,and most of them are due to construction reasons that cause the deflection to exceed the limit.Taking a large-span reinforced concrete beam with a deflection exceeding the limit as an example,according to the design data and on-site inspection data,from both design and construction,numerical calculation and finite element simulation are used to verify and analyze the deflection of the large-span reinforced concrete frame beam.reason.Validation analysis shows that the actual pouring thickness of beam slab concrete and insufficient arching height of beam template may cause the increase of beam deflection;when the stable bearing capacity of the vertical rod under the beam is insufficient,the beam is also prone to greater deflection due to the buckling deformation of the vertical rod.

关 键 词：梁挠度 模板起拱高度 稳定承载力 立杆屈曲 

分 类 号：TU74[建筑科学—建筑技术科学]