新型预应力混凝土钢管桁架叠合梁受弯性能有限元分析  

FINITE EI EMENT ANALYSIS OF THE BENDING PERFORMANCE OF NOVEL PRESTRESSED CONCRETE STEEL TUBE TRUSS COMPOSITE BEAMS

作　　者：周广强[1,2] 袁旭 ZHOU Guang-qiang;YUAN Xu(School of Civil Engineering,Shandong Jianzhu University,250101,Ji'nan,China;Key Laboratory of Building Structural Retrofitting and Underground Space Engineering,Shandong Jianzhu University,250101,Ji'nan,China)

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东建筑大学建筑结构加固改造与地下空间工程教育部重点实验室,济南250101

出　　处：《建筑技术》2024年第6期729-733,共5页Architecture Technology

基　　金：山东省重点研发计划(重大科技创新工程)项目(2021CXGC011204)。

摘　　要：为解决传统叠合梁梁柱节点区锚固困难、底板厚重等一系列问题,研究了一种新型预应力混凝土钢管桁架叠合梁。设计了6根叠合梁、3根整浇梁,采用有限元数值模拟方法,通过荷载–位移曲线及混凝土塑性损伤等情况进行了分析,并探讨试件配筋率、预制底板厚度参数对抗弯性能的影响及新型预应力钢管桁架叠合梁与整浇梁的抗弯性能对比。经数值模拟分析结果显示,配筋适当的预应力混凝土钢管桁架叠合梁可有效减少变形和裂缝,与整浇梁破坏形态相似,具有良好的抗弯性能,适用于实际工程中的推广应用。In order to address a series of issues such as difficulties in anchoring traditional composite beam-column connections and the excessive weight of the bottom slab,a new type of prestressed concrete steel tube truss composite beam was studied.Six composite beams,including three fully cast beams,were designed.Finite element numerical simulation was employed to analyze the load-displacement curves,concrete plastic damage,and other conditions.The study also explored the influence of reinforcement ratio and precast bottom slab thickness parameters on the flexural performance,as well as the comparison of flexural performance between the new prestressed steel tube truss composite beams and fully cast beams.The results of the numerical simulation analysis showed that properly reinforced prestressed concrete steel tube truss composite beams can effectively reduce deformation and cracks,exhibit a similar failure mode to fully cast beams,and possess excellent flexural performance,making them suitable for widespread application in practical engineering.

关 键 词：叠合梁 抗弯性能 配筋率 底板厚度 

分 类 号：TU375[建筑科学—结构工程]