首页|盘扣式模板支架节点安全性能试验及数值模拟研究

盘扣式模板支架节点安全性能试验及数值模拟研究

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盘扣式模板支架是一种由国家大力推崇的新型模板支架。盘扣节点的转动刚度对于盘扣式钢管脚手架的稳定承载力起着重要作用。但现有研究均未考虑盘扣节点顺/逆时针转动刚度差异对模板支架承载力的影响。为验证数值模拟所得盘扣节点力矩-转角曲线的准确性，通过对盘扣式支撑脚手架水平杆与立杆连接处节点进行试验研究，考虑顺、逆时针加载两种方案，依据试验结果得出两种方案下的支撑脚手架半刚性节点的M-θ曲线，基于有限元方法对盘扣节点的转动刚度性能进行了数值研究。结果表明:逆时针转动的承载能力和转动刚度均大于顺时针转动的情况，考虑顺/逆时针转动刚度差异的完整力矩-转角曲线更适用于盘扣式钢管脚手架稳定承载力计算;试验验证了有限元法在模拟盘扣节点加载过程中的适用性，证明了有限元方法在研究盘扣节点力学性能方面的适用性和有效性。
Experimental study on the rotational stiffness of joints in coiled formwork brackets
The coiled formwork bracket is a novel type of formwork bracket highly recommended by the state.The rotational stiffness of its joints plays a crucial role in ensuring the stable bearing capacity of the disc buckle scaffolding.However,existing studies have overlooked the impact of the clockwise and counterclockwise rotational stiffness differences of the buckle joints on the bearing capacity of the formwork bracket.To validate the torque-angle curve of the buckle joint obtained through numerical simulation,the joint of the horizontal bar connected to the pole coiled support scaffolding was experimentally examined.This paper investigates the influence of clockwise and counterclockwise loading on the stiffness of the disc joint of formwork support,based on the stress experienced by the horizontal bar in practical engineering.Subsequently,the moment-angle curve of the joint under both clockwise and counterclockwise loading conditions is derived.The loading behavior of the unidirectional disc buckle joint is simulated,analyzed,and subsequently validated through experimentation.The results are as follows:The torque-angle curve and stiffness change pattern of the coiled joint rotating clockwise/counterclockwise are similar.The load-carrying capacity and rotational stiffness during counterclockwise rotation are greater than those during clockwise rotation.The comprehensive torque-angle curve,accounting for the disparity in clockwise rotational stiffness,is better suited for calculating the stable bearing capacity of the coiled formwork bracket.The mounting direction of the buckle joint can be adjusted based on the stress and deformation of each bar at the joint,thereby effectively enhancing the safe bearing capacity of the joint.The experimental results offer valuable data support for the refinement of joint processing in finite element simulations.By simulating the loading process of nodes under various connection and loading methods,the suitability and effectiveness of the finite element method in investigating the mechanical properties of buckle nodes have been further demonstrated.

safety engineeringcoiled formwork bracketnode rotational stiffnesstorque-angle curveclockwise and counterclockwise loadingnumerical simulation

白万民、孙俪珉、张凌博、刘京红、赵川

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河南省三门峡市公路事业发展中心,河南三门峡 472000

天津城建大学土木工程学院,天津 300384

中国二十二冶集团有限公司,河北唐山 063000

安全工程 盘扣式模板支架 节点转动刚度 力矩-转角曲线 顺、逆时针加载 数值模拟

天津市自然科学基金项目天津市企业科技特派员项目

23JCQNJC0085023YDTPJC00800

2024

10.13637/j.issn.1009-6094.2024.0088

安全与环境学报
北京理工大学 中国环境科学学会 中国职业安全健康协会

安全与环境学报

CSTPCD北大核心
影响因子：0.943
ISSN：1009-6094
年,卷(期)：2024.24(8)