碳纤维布加固斜交空心板的强度研究
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摘要
我国正处于交通建设高速发展的时期,修建了许多跨江、跨海、城市桥梁,有些桥梁由于交通量大且超载严重等原因陆续出现了开裂现象亟需加固补强。碳纤维布(CFS)因其高强高效、轻质耐久、施工便捷、不中断交通、不改变桥梁净空等优点在桥梁加固中得到广泛的应用。目前国内外对碳纤维布加固研究也比较多,但大多是针对矩形实心梁,而对桥梁工程中广泛应用的空心板的研究相对较少。
本文采用有限元分析和试验研究相结合的方法,开展用CFS加固空心板正截面强度的研究,结合大型软件ANSYS和其提供的参数化语言APDL,采用实体单元、杆单元及壳单元建立CFS加固空心板的有限元分析模型,对空心板在不同的使用状态下(包括未加固、预裂后持载加固、预裂后卸载加固、完好加固)进行极限承载力分析,得到理论分析计算结果。
同时依据有限元计算的四种情况制作了4块空心板,进行CFS加固试验,观测CFS加固空心板的破坏全过程,分析其受力情况,研究碳纤维在四种使用状态下的加固对空心板抗弯性能的影响与作用。并通过有限元计算结果与试验结果的对比分析,对比内容包括空心板荷载—挠度、纵向钢筋和碳纤维布的应变,极限荷载和破坏特征,验证有限元模型的合理性。
最后依据理论与试验分析的结果,利用该方法建立了CFS加固斜交空心板桥的有限元分析模型,并进行极限承载力计算,对加固前后大桥的承载力情况进行分析。
Having been constructed many cross-river bridges、cross-sea bridges and cloverleaf junctions in recent years, china presently is in the rapid development of traffic construction period. Due to the traffic overload and some other serious problems, some of the bridge have generated cracks, so that reinforcement is needed to be done. Carbon fiber cloth (CFS), with its advantages of high intensity and efficiency, light weight and durability, convenient for construction, no need for intermit traffic and no change of headroom, has been widely applying in the bridge reinforcement. However, many research was based on the rectangle solid beam, the research on the cored slab , which has been widely applying in bridge engineering, was comparatively less than that of the rectangle solid beam.
We used the method of combine finite element analysis and experiment research in this paper, carried out the research of CFS reinforced cored slab’s intensity on the cross-section, combined the large-scale software ANSYS and its provided APDL parameter language. By the use of entities units, pole units and shell units, we established CFS reinforced cored slab finite element analysis model, analyzed the ultimate bearing capacity of the reinforced cored slab in different work condition (include none reinforcement, continual load of pre-split reinforcement, continual unload of pre-split reinforcement, intact reinforcement), then, gained the theoretical result.
At the same time, based on the four condition of the finite element analysis,we produced four cored slab, experimentized CFS reinforcement tests, observed the whole damage process of the CFS reinforced cored slab, and analyzed force performance, then, do some research the carbon fiber reinforcement’s influence on the resist monent’s capability of cored slab under the four using condition. Through finite element analysis results ,we compared them to the test results to certificate finite element model’s rationality. comparison include: cored slab load- deflection, the vertical steel bar and carbon fiber’s deformation, limit load and failure features.
Finally, we established CFS reinforced cored slab skew bridge’s finite element analysis model based on the analysis of the theoretical and experimental results, calculated the ultimate bearing capacity of the bridge and analyzed the bearing capacity before and after reinforcement on the birdge.
本文采用有限元分析和试验研究相结合的方法,开展用CFS加固空心板正截面强度的研究,结合大型软件ANSYS和其提供的参数化语言APDL,采用实体单元、杆单元及壳单元建立CFS加固空心板的有限元分析模型,对空心板在不同的使用状态下(包括未加固、预裂后持载加固、预裂后卸载加固、完好加固)进行极限承载力分析,得到理论分析计算结果。
同时依据有限元计算的四种情况制作了4块空心板,进行CFS加固试验,观测CFS加固空心板的破坏全过程,分析其受力情况,研究碳纤维在四种使用状态下的加固对空心板抗弯性能的影响与作用。并通过有限元计算结果与试验结果的对比分析,对比内容包括空心板荷载—挠度、纵向钢筋和碳纤维布的应变,极限荷载和破坏特征,验证有限元模型的合理性。
最后依据理论与试验分析的结果,利用该方法建立了CFS加固斜交空心板桥的有限元分析模型,并进行极限承载力计算,对加固前后大桥的承载力情况进行分析。
Having been constructed many cross-river bridges、cross-sea bridges and cloverleaf junctions in recent years, china presently is in the rapid development of traffic construction period. Due to the traffic overload and some other serious problems, some of the bridge have generated cracks, so that reinforcement is needed to be done. Carbon fiber cloth (CFS), with its advantages of high intensity and efficiency, light weight and durability, convenient for construction, no need for intermit traffic and no change of headroom, has been widely applying in the bridge reinforcement. However, many research was based on the rectangle solid beam, the research on the cored slab , which has been widely applying in bridge engineering, was comparatively less than that of the rectangle solid beam.
We used the method of combine finite element analysis and experiment research in this paper, carried out the research of CFS reinforced cored slab’s intensity on the cross-section, combined the large-scale software ANSYS and its provided APDL parameter language. By the use of entities units, pole units and shell units, we established CFS reinforced cored slab finite element analysis model, analyzed the ultimate bearing capacity of the reinforced cored slab in different work condition (include none reinforcement, continual load of pre-split reinforcement, continual unload of pre-split reinforcement, intact reinforcement), then, gained the theoretical result.
At the same time, based on the four condition of the finite element analysis,we produced four cored slab, experimentized CFS reinforcement tests, observed the whole damage process of the CFS reinforced cored slab, and analyzed force performance, then, do some research the carbon fiber reinforcement’s influence on the resist monent’s capability of cored slab under the four using condition. Through finite element analysis results ,we compared them to the test results to certificate finite element model’s rationality. comparison include: cored slab load- deflection, the vertical steel bar and carbon fiber’s deformation, limit load and failure features.
Finally, we established CFS reinforced cored slab skew bridge’s finite element analysis model based on the analysis of the theoretical and experimental results, calculated the ultimate bearing capacity of the bridge and analyzed the bearing capacity before and after reinforcement on the birdge.
引文
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