体外预应力砼桥关键部位静力分析及其配筋研究
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摘要
转向块是体外预应力结构的关键部位,构造形式多样,受力复杂,对其进行受力分析和构造形式合理性研究以及配筋研究十分必要。锚固块则是体外预应力结构更为关键的部位,处于复杂的高应力状态,故对其进行受力和配筋研究以及各向正应力变化规律的探讨十分必要。
本文以湖南省澧潭高速公路第12标白马垄高架桥和重庆绕城公路南段新滩大桥(右半幅)为工程背景。利用ANSYS的SOLID45单元对T梁转向块和箱梁转向块多种构造形式的模型进行了弹性应力分析,得出转向块应力分布情况、极值和最不利位置,并对比多种构造形式的应力情况,得出更合理的转向块构造形式。而对T梁锚固块和箱梁锚固块进行受力分析时,用ANSYS的SOLID45单元分别对考虑和不考虑锚垫板、体外管、角钢的锚固块模型进行弹性应力分析,并用ANSYS的SOLID65单元的整体式模型对考虑钢筋、角钢、锚垫板和体外钢管及材料非线性的锚固块模型进行非线性应力分析,对比各种模型其应力情况,得出锚固块内应力分布情况和锚垫板、角钢、体外钢管及材料非线性对锚固块应力的影响。通过对锚固块体内多条路径的各向正应力的对比,得出锚固块体内各向正应力变化规律。对T梁和箱梁的转向块和锚固块进行拉压杆模型法配筋,提出相应的配筋建议,并归纳出结构受扰区拉压杆模型建立的一般性规律。用ANSYS的SOLID65单元,建立锚固块的分离式模型,得出锚固块内钢筋的应力情况和变化规律,以及钢筋应力与同位置处砼正应力(与钢筋同方向)的关系。
本文的主要创新点:①通过对锚固块体内多条路径应力变化的总结,得出锚固块体内各向正应力的变化规律。②建立箱梁锚固块的横、竖向相互影响的空间拉压杆模型,并归纳出拉压杆模型建立的一般性规律。③通过对锚固块建立分离式有限元模型,得出锚固块内的钢筋应力变化规律。
The deviator is the key segments of the external pre-stressing structure, of which structure and internal force are relatively complex. Therefore the research about stress,structure and reinforcement design of deviator is necessary. The anchorage is another key segments of the external pre-stressing structure,which is the region of high stress. Therefore the research about stress,the variation law of stress and reinforcement design of anchorage is necessary.
This paper based on engineering of 12th section of Bai-ma-long high level bridge of the Li-lin high-speed highway in Hun-nan province and the Xin-tan bridge of the south part of the rounding Chong-qing highway. Study the elastic stress about deviator which has multiple strcture used the SOLID45 of ANSYS.Get the stress distribution,extreme value of stress and the worst siteof stress.Then coMPare the stress of different deviator and get the proper structure.When study the stress of anchorage used SOLID45 of ANSYS,account or not the filler plate,the steel angle and the external pre-stressing steel tube.When study the stress of anchorage usd integral type model of SOLID 65 of ANSYS , account the filler plate,the steel angle, the external pre-stressing steel tube and material non-linearity. coMPare the stress of different anchorage and get the rule of stress distribution and the effection of the filler plate,the steel angle, the external pre-stressing steel tube and material non-linearity. Get the rule of evry direct stress of the anchorage by coMParing the direct stress of some route. The strut -and-tie models are used for the reinforcement of the deviator and anchorage ,and give some advices about reinforcement,and get the general law of establishment of strut -and-tie model.Get the stress of bar of the anchorage by establishing the separated type model about anchorage used the SOLID65 of ANSYS ,and get the relation of stress of the bar and stress of concrete which is at the same position and the same orientation.
The paper has three innovation points:①Get the variation rule of evry direct stress by generalizing the stress of several route in the anchorage.②establish the 3-D strut-and-tie model of the anchorage which cross direction and vertical direction is interacted ,and generalize the general law about establishment of strut-and-tie model.③Get the variation rule of stress of bar in the anchorage by establishing the separated type model.
本文以湖南省澧潭高速公路第12标白马垄高架桥和重庆绕城公路南段新滩大桥(右半幅)为工程背景。利用ANSYS的SOLID45单元对T梁转向块和箱梁转向块多种构造形式的模型进行了弹性应力分析,得出转向块应力分布情况、极值和最不利位置,并对比多种构造形式的应力情况,得出更合理的转向块构造形式。而对T梁锚固块和箱梁锚固块进行受力分析时,用ANSYS的SOLID45单元分别对考虑和不考虑锚垫板、体外管、角钢的锚固块模型进行弹性应力分析,并用ANSYS的SOLID65单元的整体式模型对考虑钢筋、角钢、锚垫板和体外钢管及材料非线性的锚固块模型进行非线性应力分析,对比各种模型其应力情况,得出锚固块内应力分布情况和锚垫板、角钢、体外钢管及材料非线性对锚固块应力的影响。通过对锚固块体内多条路径的各向正应力的对比,得出锚固块体内各向正应力变化规律。对T梁和箱梁的转向块和锚固块进行拉压杆模型法配筋,提出相应的配筋建议,并归纳出结构受扰区拉压杆模型建立的一般性规律。用ANSYS的SOLID65单元,建立锚固块的分离式模型,得出锚固块内钢筋的应力情况和变化规律,以及钢筋应力与同位置处砼正应力(与钢筋同方向)的关系。
本文的主要创新点:①通过对锚固块体内多条路径应力变化的总结,得出锚固块体内各向正应力的变化规律。②建立箱梁锚固块的横、竖向相互影响的空间拉压杆模型,并归纳出拉压杆模型建立的一般性规律。③通过对锚固块建立分离式有限元模型,得出锚固块内的钢筋应力变化规律。
The deviator is the key segments of the external pre-stressing structure, of which structure and internal force are relatively complex. Therefore the research about stress,structure and reinforcement design of deviator is necessary. The anchorage is another key segments of the external pre-stressing structure,which is the region of high stress. Therefore the research about stress,the variation law of stress and reinforcement design of anchorage is necessary.
This paper based on engineering of 12th section of Bai-ma-long high level bridge of the Li-lin high-speed highway in Hun-nan province and the Xin-tan bridge of the south part of the rounding Chong-qing highway. Study the elastic stress about deviator which has multiple strcture used the SOLID45 of ANSYS.Get the stress distribution,extreme value of stress and the worst siteof stress.Then coMPare the stress of different deviator and get the proper structure.When study the stress of anchorage used SOLID45 of ANSYS,account or not the filler plate,the steel angle and the external pre-stressing steel tube.When study the stress of anchorage usd integral type model of SOLID 65 of ANSYS , account the filler plate,the steel angle, the external pre-stressing steel tube and material non-linearity. coMPare the stress of different anchorage and get the rule of stress distribution and the effection of the filler plate,the steel angle, the external pre-stressing steel tube and material non-linearity. Get the rule of evry direct stress of the anchorage by coMParing the direct stress of some route. The strut -and-tie models are used for the reinforcement of the deviator and anchorage ,and give some advices about reinforcement,and get the general law of establishment of strut -and-tie model.Get the stress of bar of the anchorage by establishing the separated type model about anchorage used the SOLID65 of ANSYS ,and get the relation of stress of the bar and stress of concrete which is at the same position and the same orientation.
The paper has three innovation points:①Get the variation rule of evry direct stress by generalizing the stress of several route in the anchorage.②establish the 3-D strut-and-tie model of the anchorage which cross direction and vertical direction is interacted ,and generalize the general law about establishment of strut-and-tie model.③Get the variation rule of stress of bar in the anchorage by establishing the separated type model.
引文
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