装配式建筑混凝土梁两端节点承载力监测仿真

Monitoring and Simulation of Bearing Capacity of Joints at Both Ends of Concrete Beams in Prefabricated Buildings

装配式建筑是由多个构件拼装在一起,拼装节点凭借预制预埋槽钢连接,是受力最小的,也是建筑整体的最小承载力,提出一种混凝土梁两端节点承载力监测方法。构建拉-压杆模型分析节点的受力情况,得到水平拉杆和竖向拉杆受剪力值,计算斜向构件、水平构件和竖向构件在剪力中所占比例,得到混凝土梁两端节点极限抗压强度;构建混凝土梁构件间力学模型,通过静力极限平衡条件计算两个节点间剪力,完成节点承载力监测工作。展开对比仿真,结果表明,所提方法得到的承载力监测结果与测试值的均方根误差最小,且承载力均值全部落在了50%置信区间内,验证方法具有较强的适用性和监测精度。

The prefabricated building is assembled by multiple components.Its joints are connected by precast embedded channel steel.This part is the minimum stressed part and the minimum bearing capacity of the building.This paper presented a method for monitoring the bearing capacity of the joints at both ends of the concrete beam.Firstly,a tension-compression bar model was constructed to analyze the stress on the joint,thus obtaining the shear values of te horizontal tie and vertical tie.Secondly,the proportion of the oblique member,horizontal member and vertical member in the shear force was calculated respectively,and then the ultimate compressive strength of the joint at both ends of the concrete beam was obtained.Thirdly,the mechanical model between concrete beam members was constructed,and then the shear force between two joints was calculated through the static limit equilibrium condition.Finally,the monitoring of joint bearing capacity was completed.Comparative simulation results show that the proposed method has the minimum root mean square error between the bearing capacity monitoring result and the test value,and the mean value of bearing capacity is within the 50%confidence interval.Therefore,the applicability and monitoring accuracy of the method is higher than ever.