本文選題：鋼-混凝土組合箱梁　切入點(diǎn)：剪力滯效應(yīng)　出處：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：鋼-混凝土組合箱梁因?yàn)槠鋬?yōu)異的力學(xué)性能、出色的經(jīng)濟(jì)和使用效益、適合傳統(tǒng)施工方法等優(yōu)點(diǎn),發(fā)展迅速。在豎向力的作用下,混凝土頂板和鋼底板均存在明顯的剪力滯效應(yīng),對剪力滯效應(yīng)忽略會(huì)導(dǎo)致結(jié)構(gòu)不安全。對于鋼-混凝土組合箱梁,混凝土板與鋼箱梁結(jié)合面的相對滑移不可忽略,相對滑移會(huì)使組合梁變形增大,也使組合梁內(nèi)的應(yīng)力重新分布,因此對鋼-混凝土組合箱梁的剪力滯及滑移效應(yīng)的分析很有必要。本文基于能量變分法,分別對不計(jì)入結(jié)合面滑移和計(jì)入結(jié)合面滑移的鋼-混凝土組合箱梁剪力滯效應(yīng)進(jìn)行了理論分析研究,做了以下工作:首先,運(yùn)用能量變分法,建立了不計(jì)結(jié)合面滑移的鋼-混凝土組合箱梁剪力滯效應(yīng)的控制微分方程,推導(dǎo)了典型邊界條件下混凝土板和鋼底板的應(yīng)力解析解。由算例分析表明,組合箱梁上下翼板存在剪力滯后現(xiàn)象且符合剪力滯分布規(guī)律,解析解值與不計(jì)滑移的有限元模擬結(jié)果進(jìn)行對比,基本吻合,證明了所推導(dǎo)的組合箱梁剪力滯效應(yīng)解析解的正確性。然后建立了考慮結(jié)合面滑移和剪力滯雙重效應(yīng)的組合箱梁力學(xué)模型,推導(dǎo)了典型邊界條件下組合箱梁的撓度和應(yīng)力解析解。結(jié)合算例分析,解析解值與計(jì)入滑移的有限元模擬結(jié)果吻合較好,說明所推導(dǎo)的考慮滑移和剪力滯雙重效應(yīng)下組合箱梁解析解的正確性。最后,對比有滑移和無滑移情況下的撓度值,簡支組合箱梁和懸臂組合箱梁在豎向荷載作用下,有滑移撓度值大于無滑移的撓度值,表明滑移會(huì)使組合箱梁的撓度增大。結(jié)合算例,對比混凝土板、鋼底板中計(jì)入滑移和不計(jì)滑移的應(yīng)力解析解值,也對比計(jì)入滑移和不計(jì)滑移的有限元應(yīng)力值,不同邊界和荷載下,計(jì)入滑移的應(yīng)力都小于不計(jì)滑移的應(yīng)力,表明滑移使組合箱梁內(nèi)的應(yīng)力重新分布,使混凝土板和鋼底板中應(yīng)力減小,減弱了剪力滯效應(yīng)。
[Abstract]:Steel-concrete composite box girder has developed rapidly because of its excellent mechanical properties, excellent economic and operational benefits, suitable for traditional construction methods, etc. Under the action of vertical force, There is obvious shear lag effect on concrete roof and steel bottom slab. Ignoring shear lag effect will lead to structural insecurity. For steel-concrete composite box girder, the relative slip between concrete slab and steel box girder can not be ignored. Relative slippage will increase the deformation of composite beam and redistribute the stress in composite beam. Therefore, it is necessary to analyze the shear lag and slip effect of steel-concrete composite box girder. In this paper, the shear lag effect of steel-concrete composite box girders without and without joint slip is studied in theory. The following works are done: firstly, the energy variation method is used to analyze the shear lag effect of steel-concrete composite box girder. The governing differential equation of shear lag effect of steel-concrete composite box girder is established, and the analytical solution of stress of concrete slab and steel bottom slab under typical boundary conditions is derived. The shear lag phenomenon exists in the upper and lower wing plates of the combined box girder and conforms to the law of shear lag distribution. The analytical solution is in good agreement with the finite element simulation results without taking into account slippage. It is proved that the analytical solution of shear lag effect of combined box girder is correct, and then the mechanical model of combined box girder considering the double effects of slip and shear lag is established. The analytical solutions of deflection and stress of composite box girder under typical boundary conditions are derived. The results show that the analytical solution of the composite box girder is correct considering the double effects of slip and shear lag. Finally, the deflection of the simple supported composite box girder and the cantilever composite box girder under vertical load is compared with the deflection of the composite box girder with and without slip. The slip deflection value is larger than the non-slip deflection value, which indicates that the slip will increase the deflection of the composite box girder. By comparing the finite element stress values with and without slip, the stress with slip is smaller than that without considering slip under different boundaries and loads, which indicates that slip redistributes the stress in composite box girder. The stress in concrete slab and steel floor is reduced, and the shear lag effect is weakened.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441

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