預(yù)應(yīng)力混凝土曲線梁結(jié)構(gòu)分析及病害防治
發(fā)布時(shí)間：2018-10-18 18:36
【摘要】：隨著我國(guó)城市軌道交通事業(yè)的迅速發(fā)展,預(yù)應(yīng)力混凝土曲線梁橋得到了越來(lái)越多的應(yīng)用。曲線梁橋是復(fù)雜的空間受力結(jié)構(gòu),“彎扭耦合”是其最顯著的受力特性。論文基于曲線橋的基本理論和有限元法,以北京地鐵十四號(hào)線跨豐沙鐵路橋?yàn)橐劳?詳細(xì)分析了預(yù)應(yīng)力混凝土曲線梁的受力特點(diǎn),總結(jié)了曲線半徑對(duì)曲梁力學(xué)行為的影響；針對(duì)曲線梁橋在施工和運(yùn)營(yíng)中常見(jiàn)的病害,著重研究了預(yù)應(yīng)力荷載、溫度荷載對(duì)曲梁的作用效應(yīng),分析了腹板鋼束側(cè)崩、主梁“爬移”、支座脫空等病害的產(chǎn)生原因,提出了一些防治措施。 研究表明：在平面外豎向荷載作用下,即使是對(duì)稱荷載,曲梁內(nèi)也會(huì)產(chǎn)生較大的扭轉(zhuǎn)力矩,發(fā)生相應(yīng)的扭轉(zhuǎn)變形。這種扭轉(zhuǎn)作用使得曲梁內(nèi)外兩側(cè)受力不均,主要表現(xiàn)為梁體內(nèi)、外兩側(cè)的應(yīng)力差異和抗扭雙支座中內(nèi)、外側(cè)支座的反力差別。隨著半徑的減小,曲梁的扭轉(zhuǎn)力矩增大,梁體內(nèi)外兩側(cè)的受力越不均勻,扭轉(zhuǎn)變形也更為劇烈。因此在曲線梁橋設(shè)計(jì)中,在滿足其他要求的前提下,應(yīng)盡可能選用較大的曲線半徑。 當(dāng)曲線半徑很小或張拉力很大時(shí),預(yù)應(yīng)力的徑向水平分布力容易造成施工時(shí)腹板鋼束的側(cè)向崩出,對(duì)此可采用預(yù)應(yīng)力鋼束外移、增設(shè)防崩鋼筋、合理設(shè)置橫隔板、進(jìn)行腹板防崩驗(yàn)算等方法,從設(shè)計(jì)上防止此類病害的發(fā)生。預(yù)應(yīng)力產(chǎn)生的扭轉(zhuǎn)作用和溫度荷載也是造成曲梁“爬移”、支座脫空的重要原因。設(shè)計(jì)時(shí)應(yīng)預(yù)留足夠的伸縮縫變形量和支座允許變形量,保證曲梁沿切向的自由伸縮,同時(shí)采取一定的限位措施；對(duì)于支座脫空現(xiàn)象,可采取增大梁端支座間距,增強(qiáng)端部梁體抗扭性能的方法來(lái)處理。
[Abstract]:With the rapid development of urban rail transit in China, prestressed concrete curved girder bridge has been applied more and more. Curved girder bridge is a complicated spatial structure, and "bending and torsional coupling" is the most obvious force characteristic. Based on the basic theory of curved bridge and finite element method, based on the Fengsha railway bridge of Beijing metro line 14, the stress characteristics of prestressed concrete curved beam are analyzed in detail, and the influence of curve radius on the mechanical behavior of curved beam is summarized. In view of the common diseases of curved girder bridge in construction and operation, the effects of prestress load and temperature load on curved beam are studied, and the causes of web plate steel bundle side collapse, main beam "climbing and moving" and support detachment are analyzed. Some preventive measures are put forward. The results show that under the action of vertical load outside the plane, even the symmetrical load, the torsional moment in the curved beam will be larger and the corresponding torsional deformation will occur. This kind of torsion causes the internal and external forces of curved beam to be uneven, which mainly shows the stress difference in the inside and outside of the beam and the difference in the reaction force between the inner and outer supports of the double bearing with torsion. With the decrease of radius, the torsional moment of curved beam increases, and the force on both sides of the beam becomes more uneven, and the torsional deformation becomes more severe. Therefore, in the design of curved girder bridge, under the premise of satisfying other requirements, the larger curve radius should be chosen as far as possible. When the curve radius is very small or the tensile force is very large, the radial horizontal distribution force of prestressing force will easily cause the lateral collapse of web steel bundle during construction. For this reason, the prestressed steel bundle can be removed from the outside, the anti-avalanche steel bar is added, and the transverse partition plate is reasonably set up. In order to prevent the occurrence of this kind of disease, the methods of web anti-avalanche checking and so on are carried out. Torsion and temperature load caused by prestress are also the important reasons for "climbing and moving" of curved beam and void of support. Enough deformation of expansion joints and allowable deformation of supports should be reserved in design to ensure the free expansion of curved beams along the tangential direction, and certain limiting measures should be taken at the same time; for the phenomenon of support clearance, it is possible to increase the distance between the supports at the end of the beam, The method of strengthening the torsion resistance of the end beam body is used.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.7;U441
本文編號(hào)：2280022
[Abstract]:With the rapid development of urban rail transit in China, prestressed concrete curved girder bridge has been applied more and more. Curved girder bridge is a complicated spatial structure, and "bending and torsional coupling" is the most obvious force characteristic. Based on the basic theory of curved bridge and finite element method, based on the Fengsha railway bridge of Beijing metro line 14, the stress characteristics of prestressed concrete curved beam are analyzed in detail, and the influence of curve radius on the mechanical behavior of curved beam is summarized. In view of the common diseases of curved girder bridge in construction and operation, the effects of prestress load and temperature load on curved beam are studied, and the causes of web plate steel bundle side collapse, main beam "climbing and moving" and support detachment are analyzed. Some preventive measures are put forward. The results show that under the action of vertical load outside the plane, even the symmetrical load, the torsional moment in the curved beam will be larger and the corresponding torsional deformation will occur. This kind of torsion causes the internal and external forces of curved beam to be uneven, which mainly shows the stress difference in the inside and outside of the beam and the difference in the reaction force between the inner and outer supports of the double bearing with torsion. With the decrease of radius, the torsional moment of curved beam increases, and the force on both sides of the beam becomes more uneven, and the torsional deformation becomes more severe. Therefore, in the design of curved girder bridge, under the premise of satisfying other requirements, the larger curve radius should be chosen as far as possible. When the curve radius is very small or the tensile force is very large, the radial horizontal distribution force of prestressing force will easily cause the lateral collapse of web steel bundle during construction. For this reason, the prestressed steel bundle can be removed from the outside, the anti-avalanche steel bar is added, and the transverse partition plate is reasonably set up. In order to prevent the occurrence of this kind of disease, the methods of web anti-avalanche checking and so on are carried out. Torsion and temperature load caused by prestress are also the important reasons for "climbing and moving" of curved beam and void of support. Enough deformation of expansion joints and allowable deformation of supports should be reserved in design to ensure the free expansion of curved beams along the tangential direction, and certain limiting measures should be taken at the same time; for the phenomenon of support clearance, it is possible to increase the distance between the supports at the end of the beam, The method of strengthening the torsion resistance of the end beam body is used.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U445.7;U441
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