体外预应力混凝土箱梁结构的力学响应研究
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摘要
引入退化壳单元理论,并采用拉伸刚化模型和理想弹塑性模型来描述混凝土和钢筋的材料非线性,并建立体外预应力混凝土箱梁的分析模型。通过典型加载分析可知,受力裂缝发生于跨中,且随着加载量增大,裂缝由跨中向两端发展直至结构破坏。加载初期预应力钢筋的应力变化缓慢,加载后期变化迅速,结构破坏时体内预应力钢筋进入屈服阶段,而体外预应力钢筋仍未屈服。加载初期梁体刚度基本保持不变,挠度随荷载的增加呈线性增加;随着荷载的增加,截面刚度下降,进入加载后期后刚度退化迅速。
The theory of shell element was introduced,and the material nonlinearity of concrete and steel bar was described by tension rigidization model and ideal elastoplastic model,and the analysis model of external pre-stressed concrete box girder was established.According to the typical loading analysis,cracks occurred in the middle of span,and with the increasing of loading,cracks developed from the middle of span to both ends until the structure was destroyed.In the initial stage of loading,the stress of the pre-stressed steel bar changed slowly and rapidly in the later stage of loading.When the structure was damaged,the internal pre-stressed steel bar entered the yield stage,while the external pre-stressed steel bar has not yet yielded.In the initial stage of loading,the stiffness of the beam remains basically unchanged,and the deflection increased linearly with the increasing of load.With the increasing of load,the stiffness of the section decreased,and the stiffness degenerated rapidly in the later stage of loading.
The theory of shell element was introduced,and the material nonlinearity of concrete and steel bar was described by tension rigidization model and ideal elastoplastic model,and the analysis model of external pre-stressed concrete box girder was established.According to the typical loading analysis,cracks occurred in the middle of span,and with the increasing of loading,cracks developed from the middle of span to both ends until the structure was destroyed.In the initial stage of loading,the stress of the pre-stressed steel bar changed slowly and rapidly in the later stage of loading.When the structure was damaged,the internal pre-stressed steel bar entered the yield stage,while the external pre-stressed steel bar has not yet yielded.In the initial stage of loading,the stiffness of the beam remains basically unchanged,and the deflection increased linearly with the increasing of load.With the increasing of load,the stiffness of the section decreased,and the stiffness degenerated rapidly in the later stage of loading.
引文
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[2]袁爱民,吴闻秀,孙大松,等.体内体外混合配束节段预制箱梁受弯性能试验[J].长安大学学报:自然科学版,2015,35(5):73-81,103.
[3]Burningham C A,Pantelides C P,Reaveley L D.Repair of prestressed concrete beams with damaged steel tendons using post-tensioned carbon fiber-reinforced polymer rods[J].Aci Structural Journal,2014,111(2):387-395.
[4]叶欣,张剑,殷王华.基于退化体单元的PC梁全过程响应[J].低温建筑技术,2017,39(1):15-17.
[5]Madhusudan C,Rangan B V,Hall A S.Discussion:Studies on prestressed concrete hollow beams in combined torsion and bending[J].Magazine of Concrete Research,2015,32(110):51-52.
[6]周昊,马径先.中国桥梁建设现状及发展方向研究[J].科技创新与应用,2015(33):225-225.
[7]贺志启,刘钊,张宇峰.基于桁架-拱叠加模型的体外预应力混凝土梁抗剪承载力计算方法[J].土木工程学报,2010,43(1):56-63.
[8]陶鹏,艾军.桥梁结构快速评估方法的研究与软件实现[J].公路交通科技,2012,29(1):104-108.
[9]叶献国,闫丽萍.高强钢筋高强混凝土预应力梁短期刚度研究[J].福州大学学报,2013,41(4):723-728.
[10]叶翔.体内、外混合配束预应力混凝土箱梁抗剪性能研究[D].南京:南京航空航天大学,2012.
[11]金伟良,赵羽习.锈蚀钢筋混凝土梁抗弯强度的试验研究[J].南昌大学学报,2006,28(2):194-196.
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