【摘要】：為探究寬幅拱形獨塔PC斜拉橋的力學(xué)行為特征,本文針對寬幅拱形獨塔雙索面PC斜拉橋的結(jié)構(gòu)特點,基于梁格法進行了PC箱梁空間分析、無端錨索獨塔體系的整體剛度及穩(wěn)定性分析。針對背景工程主梁采用的逐段支架現(xiàn)澆施工法,分析了整體支架現(xiàn)澆、懸臂掛籃現(xiàn)澆施工及逐段支架現(xiàn)澆三者之間在施工過程及成橋狀態(tài)的主梁線形及受力狀態(tài),對成橋狀態(tài)還進行了結(jié)構(gòu)動力分析。主要研究內(nèi)容如下:(1)針對寬幅PC箱梁,研究不同截面劃分方式對縱梁計算結(jié)果的影響,并以相同的簡化結(jié)構(gòu),對比分析梁格法與實體單元法在應(yīng)力、撓度、軸向壓縮計算結(jié)果的區(qū)別,證明了應(yīng)以各縱梁中性軸高度一致為原則根據(jù)箱梁腹板進行劃分,且梁格法對于縱梁撓度計算的準(zhǔn)確性高于應(yīng)力計算;寬幅PC箱梁的橫梁受到不可忽略的面外彎矩的影響,受力情況復(fù)雜,設(shè)計時因注重預(yù)應(yīng)力在橫向布置的均勻性,減小橫梁受到的面外彎矩作用。(2)在不改變施工初張拉力的前提下,從拉索索力、主梁應(yīng)力及施工預(yù)拱度設(shè)置方面進行了分析研究。證明了在不改變施工初張拉力的前提下,將逐段支架現(xiàn)澆施工變更為整體支架現(xiàn)澆施工具備可行性,在受力及變形方面受到影響較小,可以忽略;將逐段支架現(xiàn)澆施工變更為懸臂掛籃現(xiàn)澆施工具備可行性,但需要改變預(yù)拱度設(shè)置及成橋后調(diào)索方案。(3)研究活載作用下塔頂偏位及主梁最大撓度對塔柱剛度、拉索剛度、主梁剛度的敏感性,以及對不同位置拉索剛度的敏感性。證明了改變主梁截面腹板高度的優(yōu)化設(shè)計方案為改善整體剛度的最佳方案。(4)結(jié)構(gòu)動力分析。通過成橋后的結(jié)構(gòu)動力特性分析,論證其抗風(fēng)、抗震能力。(5)對研究內(nèi)容進行了總結(jié),并對后續(xù)研究進行了展望。
[Abstract]:In order to investigate the mechanical behavior characteristics of wide arch PC cable-stayed bridge with single tower, the space analysis of PC box girder is carried out based on the beam lattice method in view of the structural characteristics of PC cable-stayed bridge with wide arch single tower and double cable plane. Analysis of the overall stiffness and stability of the single tower system with no end Anchorage cable. In view of the construction method of stage by section support cast-in-place for the main beam of background engineering, the line shape and force state of the main beam in the construction process and the state of the bridge are analyzed, including the integral support cast-in-situ construction, the cantilever hanging basket cast-in-situ construction and the in-situ casting construction of the cantilever scaffold. The structural dynamic analysis of the bridge is also carried out. The main research contents are as follows: (1) for wide PC box girder, the influence of different cross sections on the calculation results of longitudinal beam is studied, and with the same simplified structure, the stress and deflection of beam lattice method and solid element method are compared and analyzed. The difference of axial compression calculation results proves that the box girder web should be divided according to the principle of uniform height of neutral axis of each longitudinal beam, and the accuracy of beam lattice method for calculating longitudinal beam deflection is higher than that of stress calculation. The cross beam of wide PC box girder is affected by the out-of-plane bending moment which can not be ignored, so the stress is complicated, so it is necessary to pay attention to the uniformity of the prestressing force in the transverse arrangement. (2) on the premise of not changing the initial tensile force, the cable force, the stress of the main beam and the setting of the pre-camber of the construction are analyzed and studied in terms of the cable force, the stress of the main beam and the pre-camber of the construction. It is proved that it is feasible to change the cast-in-place construction of step by step support to integral support without changing the initial tensile force of construction, and the influence on stress and deformation is small, which can be ignored. It is feasible to change the cast-in-place construction of step by section support into cantilever hanging basket cast-in-situ construction, but it is necessary to change the setting of pre-arch degree and the scheme of cable adjustment after completion of the bridge. (3) the study of tower top deflection and maximum deflection of main beam to column stiffness and cable stiffness under live load, The sensitivity of the stiffness of the main beam and the stiffness of the cable at different positions. It is proved that the optimum design scheme of changing the height of the web plate of the main beam section is the best scheme to improve the overall stiffness. (4) dynamic analysis of the structure. Through the analysis of the dynamic characteristics of the bridge, the wind-resistant and anti-seismic capacity of the bridge is demonstrated. (5) the contents of the study are summarized, and the future research is prospected.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.27

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