带肋配筋空心方钢管高强混凝土轴压短柱力学性能有限元分析  

Finite Element Analysis on Axial Compressive Performance of RHHCFST Short Columns with Longitudinal Stiffeners

作　　者：杨志坚[1] 左闻智 Zhijian Yang;Wenzhi Zuo(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168

出　　处：《钢结构（中英文）》2024年第7期19-28,共10页Steel Construction（Chinese & English）

基　　金：国家自然科学基金项目(52178148,51808353);辽宁省优秀青年基金项目(2021-YQ-10);“兴辽英才”青年拔尖人才(XKYC2203109)

摘　　要：空心钢管混凝土是一种具有优良性能的组合构件,广泛应用于建筑、桥梁、隧道等工程结构中,矩形钢管混凝土柱与圆形相比,有施工方便、节点构造简单等优点,但研究表明相比于圆形空心钢管混凝土,矩形构件的组合强度较低,延性较差;配筋、加劲等措施,能够有效提升组合柱的强度与延性。PHC管桩是采用先张预应力离心成型工艺,经过蒸汽养护制成的一种空心圆形钢筋混凝土预制构件,内置纵筋能够提升管桩抗弯性能,螺旋箍筋能够改善结构的延性,其单桩承载力高,造价低,应用范围十分广泛。故提出将PHC管桩放入带肋钢管中,夹层混凝土后浇,制成一种新型组合构件——带肋配筋空心方钢管混凝土。已有研究表明,钢管壁厚及宽厚比对此类组合构件的轴压承载力影响最为显著。为研究带肋配筋空心方钢管高强混凝土短柱的轴压性能,以加劲肋数量、钢管壁厚为变化参数对18个带肋配筋钢管混凝土构件进行了有限元模拟,与已有试验结果进行对比,荷载-位移曲线吻合良好。有限元分析结果表明,构件的受力过程可分为弹性阶段、弹塑性阶段、塑性强化阶段、下降阶段,加劲肋对构件轴压力学性能的影响在四个阶段均有所表现。加劲肋能够有效抑制钢管局部屈曲,使得钢管分担更多轴向荷载,充分发挥钢材的轴压性能。研究表明,相比于无肋构件,单肋构件的极限承载力有明显的提升,继续增加加劲肋数量,构件的极限承载力会继续提升,但提升幅度较小。无肋构件中的钢管分担内力会较早达到峰值,分担内力-位移曲线进入下降阶段,而带肋构件的钢管分担内力达到峰值较晚,分担内力-位移曲线无明显的下降段,表明带肋构件的钢管能够在加载后期承担更多的轴向荷载,从而提升构件的延性。相比于增大钢管壁厚,采用合理的加劲措施能够更有效地提升组合构件的�Hollow concrete filled steel tube is a composite material with excellent performance,widely used in engineering structures such as buildings,bridges,and tunnels.Compared with circular concrete filled steel tube columns,rectangular concrete filled steel tube columns have advantages such as convenient construction and simple node structure.However,research has shown that compared with circular hollow concrete filled steel tube,rectangular members have lower composite strength and poorer ductility.Reinforcement and reinforcement measures can effectively enhance the strength and ductility of composite columns.PHC tubular pile is a hollow circular reinforced concrete prefabricated member made by pre tensioning and centrifugal molding technology and steam curing.The built-in longitudinal bars can improve the bending performance of the tubular pile,and the spiral hoop bars can improve the ductility of the structure.Its single pile bearing capacity is high,the cost is low,and its application range is very wide.This article proposes a new type of composite member-ribbed reinforced hollow square concrete filled steel tube-by placing PHC pile into ribbed steel tube and pouring sandwich concrete afterwards.Previous studies have shown that the wall thickness and width to thickness ratio of the steel tube have the most significant impact on the axial compressive bearing capacity of such composite members.To study the axial compression performance of reinforced hollow square steel tube high-strength concrete short columns with ribs,this paper conducted finite element simulations on 18 reinforced concrete filled steel tube members with ribs and steel tube wall thickness as variable parameters including the number of stiffeners and the thickness of steel tube.The results were compared with existing experimental results,and the load displacement curves were well fitted.The finite element analysis results indicate that the stress process of the member can be divided into elastic stage,elastic-plastic stage,plastic strengthening sta

关 键 词：钢管混凝土 加劲肋 空心方钢管 PHC管桩 轴压性能 

分 类 号：TU398.9[建筑科学—结构工程]