集中荷载作用下模板支撑架杆系受力试验研究  

Experimental study on force of rod system of template support frame under concentrated load

作　　者：张斌昌 刘彬 马伟伟 李建鹏 陈辉[2] 牛学超[2] ZHANG Binchang;LIU Bin;MA Weiwei;LI Jianpeng;CHEN Hui;NIU Xuechao(China Construction Sixth Engineering Division Co.,Ltd.,Tianjin 300450,China;School of Architecture and Surveying Engineering,Beijing Polytechinc College,Beijing 100042,China)

机构地区：[1]中国建筑第六工程局有限公司,天津300450 [2]北京工业职业技术学院建筑与测绘工程学院,北京100042

出　　处：《建筑结构》2023年第11期143-148,共6页Building Structure

基　　金：北京工业职业技术学院重点支持项目(BGZY2019KY-20ZY)。

摘　　要：为了在模板支撑架数值计算时合理选取相关参数和安全监测时合理布置测点,进行了集中荷载作用下4跨×6跨×2步的扣件式模板支撑架体系的破坏性试验。分析了模板支撑架体系立杆和水平杆的受力和变形状态,计算了杆件的弯矩,并分析了不同位置杆件弯矩分布规律。结果表明,连续但不同跨度内的水平杆弯曲方向相反,单跨水平杆弯曲形状类似于正弦曲线;模板支撑架中上部立杆和水平杆弯矩较大,且弯矩由模板支撑架中上部向四周有逐渐减小的趋势,但边部立杆和水平杆弯矩值会显著增加;立杆破坏时实测应变值与计算应变值差距较大;模板支撑架体系失稳有一个荷载传递过程,其失稳状态与单个欧拉杆失稳状态有较大区别;立杆中间段应变分布较为均匀,而两端偏心受压非常明显,符合圣维南原理。试验结论对模板支撑架失稳分析和数值计算、模架设计、施工、管理以及安全监测测点布置具有参考意义。In order to reasonably select relevant parameters when numerical calculation of the template support frame and reasonably arrange the measuring points when safety monitoring,the destructive test of 4 span×6 span×2 step fastener template support frame system under concentrated load was carried out.The force and deformation state of the vertical and horizontal rods of the template support frame system were analyzed,and the bending moment of the rod was calculated and the distribution law of the bending moment of the rod at different positions was analyzed.The results show that the horizontal rods in the continuous but different spans are bent in the opposite direction.The single-span horizontal rod has a curved shape similar to a sinusoid.The bending moment of the vertical and horizontal rods is larger in the middle and upper part of template support frame,and the bending moment gradually decreases from the middle and upper part of the formwork support frame toward the circumference,but the bending moment value of the vertical rod and the horizontal rod in the side will increase significantly.The difference between the measured strain value and calculation strain value when the vertical rod fails is large.The instability of the template support frame has a load transfer process,which is quite different from the instability state of a single Euler rod.The strain distribution in the middle of the vertical rod is relatively uniform,and the eccentric compression at both ends are very obvious,in line with the Saint-Venant principle.The test conclusion has reference significance for the instability analysis and numerical calculation of the template support frame and the safety monitoring point arrangement.

关 键 词：集中荷载 模板支撑架 弯矩分布 监测 模型试验 

分 类 号：TU398.7[建筑科学—结构工程]