基于损伤模型有限元分析的密缝叠合楼板导载模式研究  

Research on Load Transfer Modes of Lattice Girder Floor Slabs Based on Damage Plastic FEM

作　　者：任彧 徐沛韬 陈晟 REN Yu;XU Peitao;CHEN Sheng(Fujian Construction Engineering Group Co.,Ltd.,Fuzhou 350001;Prefabricated Building Branch,Fujian Provincial Institute of Architectural Design and Research Co.,Ltd.,Fuzhou 350001;Fuzhou New Area Development Investment Group Co.Ltd.,Fuzhou 350000)

机构地区：[1]福建建工集团有限责任公司,福建福州350001 [2]福建省建筑设计研究院有限公司现代房屋建筑研究设计分院,福建福州350001 [3]福州新区开发投资集团有限公司,福建福州350000

出　　处：《福建建筑》2020年第9期47-54,共8页Fujian Architecture & Construction

基　　金：福建省科技重大专项“装配式混凝土建筑绿色建造关键技术与产业化示范应用研究”(项目编号:2019HZ07011)。

摘　　要：采用基于混凝土损伤模型的弹塑性有限元分析,研究密拼缝构造对叠合楼板导载模式的影响。通过对不同长宽比的75个算例进行分析,计算结果表明:在弹性阶段,采用壳单元模型和实体单元模型均在接缝位置出现反力增大的情况;完整板进入弹塑性阶段后,其支座反力初期呈现单峰值分布状态;随着荷载的增加,支座反力均出现多峰值分布的特点;密拼缝板进入弹塑性阶段后,短边方向的变化规律与完整板较为相似,长边方向上反力集中区域的峰值基本不随荷载增大而变化,在边长1/6至1/4区间内随着荷载的增加,反力明显增大且呈波浪状分布,并基此给出了不同长宽比条件下完整板和密缝叠合板的长短边反力的分担规律。计算结果表明,无论是单缝叠合板还是双缝叠合板均呈现出明显的双向传力的特征。In this paper,an elastic-plastic finite element analysis based on concrete damage model was used to study the influence of close-joint connection disposal on the load transfer mode of the lattice girder floor slabs.Through the analysis of 75 examples with different aspect ratios,the results showed that:The model used shell element and the model used solid element both showed that the support reaction increased at the joint.After the cast-in-site slab entered the elastoplastic stage,the curve of initial support reaction showed a single peak distribution state.As the load increases,the curves of the support reaction had the characteristics of multi-peak distribution.After the lattice girder floor slabs with close-joint connection entered the elastoplastic stage,the variation of the short-side was similar to the variation of the cast-in-site slab.And the peak value of the support reaction concentration area at the long-side did not change with the increase of the load.However,with the increase of the load in the interval from 1/6 to 1/4 of the long-side,the reaction force increased obviously and it was distributed in a wavy manner.This paper also gave the distribution rules of the long and short side reaction forces of the cast-in-site slab and the lattice girder floor slabs with close-joint connection under different aspect ratio conditions.The results showed that both lattice girder floor slabs with single-joint and double-joints have an obvious two-way load distribution pattern.

关 键 词：密拼缝叠合楼板 混凝土损伤模型 有限元分析 导载模式 

分 类 号：TU3[建筑科学—结构工程]