高速鐵路中承式梁拱組合橋受力性能及徐變隨機(jī)靈敏度分析
發(fā)布時(shí)間：2018-07-25 21:09
【摘要】：中承式梁拱組合橋通過主拱肋對梁體的加強(qiáng)作用,大幅提高了橋梁的整體剛度,并且主縱梁與主拱肋固結(jié),使橋面系與主拱肋形成一個(gè)整體共同受力,可以適應(yīng)高速鐵路對橋梁結(jié)構(gòu)橫向剛度、豎向剛度、扭轉(zhuǎn)剛度和橋面高平順性的要求。中承式梁拱組合橋可以采用懸拼、轉(zhuǎn)體施工等多種施工方式,對線下車輛的正常通行影響較小,并且三跨飛燕式造型美觀,特別適合在城市及周邊等景觀要求較高的橋位處修建。當(dāng)前有關(guān)中承式梁拱組合橋的研究文獻(xiàn)尚不多見,本文以某高速鐵路中承式鋼箱混凝土梁拱組合橋?yàn)楣こ瘫尘?對中承式梁拱組合橋的結(jié)構(gòu)體系開展了較為系統(tǒng)的研究,同時(shí)對鋼管混凝土結(jié)構(gòu)徐變隨機(jī)靈敏度分析方法及應(yīng)用開展了研究,主要成果如下：1、基于吊桿膜張力假定,建立中承式梁拱組合橋的簡化力學(xué)模型,并根據(jù)變形協(xié)調(diào)條件和力法推導(dǎo)了中承式梁拱組合橋的內(nèi)力和主拱肋、主縱梁跨中截面的豎向變形計(jì)算公式,并采用Matlab軟件編制了計(jì)算程序；通過算例對比分析證明,該方法雖然由于膜張力假定導(dǎo)致一定的誤差,但是計(jì)算精度較高,具有無需建模、參數(shù)修改方便、計(jì)算速度快的優(yōu)點(diǎn),可以適用于方案設(shè)計(jì)階段的估算。2、基于本文編制的計(jì)算程序,分析了中承式梁拱組合橋拱梁剛度比、矢跨比、邊主跨比和橋面高度比的合理取值范圍；并依托某高速鐵路中承式梁拱組合橋工程實(shí)際,分析了三種不同結(jié)構(gòu)體系對中承式梁拱組合橋力學(xué)性能的影響。3、結(jié)合課題依托工程實(shí)際,設(shè)計(jì)并完成了中承式梁拱組合橋的拱梁固結(jié)區(qū)域模型荷載試驗(yàn)；拱梁固結(jié)區(qū)模型試驗(yàn)結(jié)果表明：在設(shè)計(jì)荷載作用下該區(qū)域處于良好的彈性工作狀態(tài),應(yīng)力分布均勻,拱梁固結(jié)區(qū)傳力路徑明確,結(jié)構(gòu)應(yīng)力水平較低,但主拱肋內(nèi)填混凝土存在局部應(yīng)力集中現(xiàn)象。4、以廣義徐變系數(shù)為基礎(chǔ),基于鋼管混凝土變形協(xié)調(diào)條件,推導(dǎo)證明可以將核心混凝土的自由徐變應(yīng)變量作為鋼管混凝土徐變計(jì)算的基本變量,提出等效溫度荷載法計(jì)算鋼管混凝土徐變；并基于有限元軟件,采用等效溫度荷載法,將修正后的3種典型的混凝土徐變系數(shù)模型用于長期軸壓荷載作用下鋼管混凝土構(gòu)件的徐變性能分析。該方法只需對核心混凝土施加等效溫度荷載,簡化了鋼管混凝土構(gòu)件的徐變計(jì)算分析過程,通過與鋼管混凝土徐變模型試驗(yàn)實(shí)測結(jié)果對比,驗(yàn)證了該方法的可行性。5、通過對普通粒子群算法的改進(jìn),提出了自適應(yīng)混合粒子群算法,并對多個(gè)高維多峰函數(shù)進(jìn)行尋優(yōu)分析,證明該方法具有良好魯棒性和搜索尋優(yōu)精度。將自適應(yīng)混合粒子群算法引入支持向量機(jī)參數(shù)的優(yōu)化訓(xùn)練中,利用具有良好小樣本學(xué)習(xí)能力的支持向量機(jī)回歸擬合鋼管混凝土徐變效應(yīng)的顯式函數(shù),計(jì)算隨機(jī)變量的靈敏度系數(shù),并結(jié)合蒙特卡洛法進(jìn)行隨機(jī)性分析。通過對兩個(gè)鋼管混凝土軸壓模型試驗(yàn)進(jìn)行徐變隨機(jī)靈敏度分析,驗(yàn)證了該方法在鋼管混凝土徐變隨機(jī)性分析中應(yīng)用的可行性和準(zhǔn)確性,同時(shí)分析了各隨機(jī)變量對鋼管混凝土結(jié)構(gòu)徐變效應(yīng)的敏感性。6、基于等效溫度荷載法,推導(dǎo)了彎壓荷載作用下矩形截面鋼管混凝土結(jié)構(gòu)徐變效應(yīng)計(jì)算的溫度梯度荷載計(jì)算公式,并應(yīng)用于中承式鋼箱混凝土梁拱組合橋徐變效應(yīng)分析中。采用基于支持向量機(jī)和蒙特卡洛法,對某中承式鋼箱混凝土梁拱組合橋拱頂、固結(jié)區(qū)、拱腳位置處鋼箱和內(nèi)填混凝土內(nèi)力、應(yīng)力,以及跨中截面位移增量的徐變效應(yīng)進(jìn)行隨機(jī)性分析,并分析了各隨機(jī)變量對中承式鋼箱混凝土梁拱組合橋徐變效應(yīng)的敏感性。
[Abstract]:Through the strengthening effect of the main arch rib to the beam body, the middle bearing type beam arch combination bridge greatly improves the overall stiffness of the bridge, and the main longitudinal beam is consolidated with the main arch rib, making the bridge deck and the main arch rib form a whole common stress, which can adapt to the requirements of the bridge structure lateral stiffness, vertical stiffness, torsional rigidity and the high smoothness of the bridge surface. The combination bridge of mid bearing girder and arch can be used in a variety of construction methods, such as hanging spelling and turning construction, which have little influence on the normal traffic under the line, and the three span swallow style is beautiful, especially suitable for the construction of the bridge position at the high requirement of the city and the surrounding landscape. In a high speed railway, the bearing type steel box concrete beam arch composite bridge is the engineering background, the structure system of the middle bearing type beam arch composite bridge is systematically studied. At the same time, the stochastic sensitivity analysis method and application of the concrete filled steel tube structure are studied. The main achievements are as follows: 1, based on the assumption of the tension of the hanger membrane, the establishment of the mid bearing type is established. The simplified mechanical model of the composite bridge of beam and arch is introduced. According to the deformation coordination condition and force method, the calculation formula of the vertical deformation of the middle span beam arch combined bridge is derived, and the calculation program of the vertical deformation of the middle section of the main longitudinal beam is obtained. The calculation program is compiled with Matlab software. The accuracy of the calculation is high, but it has the advantages of no modeling, convenient parameter modification and fast calculation. It can be applied to the estimated.2 in the design phase of the scheme. Based on the program compiled in this paper, the reasonable range of the stiffness ratio, the span ratio, the side main span ratio and the height ratio of the bridge surface are analyzed. The effect of three different structural systems on the mechanical properties of the mid bearing beam arch combined bridge is analyzed by three different structural systems in a high speed railway. Based on the project, the load test of the consolidation zone model of the arch beam of the middle bearing beam arch combined bridge is designed and completed. The results of the arch beam consolidation zone model test show that: Under the design load, the region is in good elastic working state, the stress distribution is uniform, the force path of the arch beam consolidation area is clear and the stress level is low, but the local stress concentration in the main arch rib is.4, based on the generalized creep coefficient, based on the deformation coordination conditions of steel pipe concrete, it is proved that the core can be the core. The free creep strain of the concrete is the basic variable of the creep calculation of the concrete filled steel tube, and the equivalent temperature load method is proposed to calculate the creep of the concrete filled steel tube. Based on the finite element software, the equivalent temperature load method is adopted to apply the modified 3 typical concrete creep modulus model to the concrete filled steel tube under the long-term axial load. This method only needs to apply the equivalent temperature load to the core concrete, simplifies the calculation and analysis process of the creep of the concrete filled steel tube. By comparing with the test results of the concrete filled steel tube creep model test, the feasibility of the method.5 is verified. By improving the ordinary particle swarm optimization, the adaptive mixing is put forward. The hybrid particle swarm optimization (PSO) algorithm is used to optimize and analyze a number of high dimensional peak functions. It is proved that the method has good robustness and search optimization accuracy. The adaptive hybrid particle swarm optimization is introduced into the optimization training of support vector machine parameters, and the support vector machine with good small sample learning ability is used to regress the concrete filled steel tube Xu Bianxiao The sensitivity coefficients of the random variables are calculated and the random analysis is carried out with Monte Carlo method. The random sensitivity analysis of two concrete filled steel tubular model tests is carried out to verify the feasibility and accuracy of the method in the stochastic analysis of concrete filled steel tube creep. The sensitivity of variable to the creep effect of concrete filled steel tube structure is.6. Based on the equivalent temperature load method, the calculation formula of temperature gradient load for the calculation of the creep effect of rectangular section concrete filled steel tube structure under the action of bending load is derived, and applied to the analysis of the creep effect of the medium bearing steel box concrete beam arch combined bridge. The mechanical and Monte Carlo method is used to analyze the randomness of the internal force, stress, and creep effect of the cross section displacement increment, and the sensitivity of the random variables to the creep effect of the medium bearing steel box concrete beam arch combined bridge is analyzed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U441
本文編號：2145094
[Abstract]:Through the strengthening effect of the main arch rib to the beam body, the middle bearing type beam arch combination bridge greatly improves the overall stiffness of the bridge, and the main longitudinal beam is consolidated with the main arch rib, making the bridge deck and the main arch rib form a whole common stress, which can adapt to the requirements of the bridge structure lateral stiffness, vertical stiffness, torsional rigidity and the high smoothness of the bridge surface. The combination bridge of mid bearing girder and arch can be used in a variety of construction methods, such as hanging spelling and turning construction, which have little influence on the normal traffic under the line, and the three span swallow style is beautiful, especially suitable for the construction of the bridge position at the high requirement of the city and the surrounding landscape. In a high speed railway, the bearing type steel box concrete beam arch composite bridge is the engineering background, the structure system of the middle bearing type beam arch composite bridge is systematically studied. At the same time, the stochastic sensitivity analysis method and application of the concrete filled steel tube structure are studied. The main achievements are as follows: 1, based on the assumption of the tension of the hanger membrane, the establishment of the mid bearing type is established. The simplified mechanical model of the composite bridge of beam and arch is introduced. According to the deformation coordination condition and force method, the calculation formula of the vertical deformation of the middle span beam arch combined bridge is derived, and the calculation program of the vertical deformation of the middle section of the main longitudinal beam is obtained. The calculation program is compiled with Matlab software. The accuracy of the calculation is high, but it has the advantages of no modeling, convenient parameter modification and fast calculation. It can be applied to the estimated.2 in the design phase of the scheme. Based on the program compiled in this paper, the reasonable range of the stiffness ratio, the span ratio, the side main span ratio and the height ratio of the bridge surface are analyzed. The effect of three different structural systems on the mechanical properties of the mid bearing beam arch combined bridge is analyzed by three different structural systems in a high speed railway. Based on the project, the load test of the consolidation zone model of the arch beam of the middle bearing beam arch combined bridge is designed and completed. The results of the arch beam consolidation zone model test show that: Under the design load, the region is in good elastic working state, the stress distribution is uniform, the force path of the arch beam consolidation area is clear and the stress level is low, but the local stress concentration in the main arch rib is.4, based on the generalized creep coefficient, based on the deformation coordination conditions of steel pipe concrete, it is proved that the core can be the core. The free creep strain of the concrete is the basic variable of the creep calculation of the concrete filled steel tube, and the equivalent temperature load method is proposed to calculate the creep of the concrete filled steel tube. Based on the finite element software, the equivalent temperature load method is adopted to apply the modified 3 typical concrete creep modulus model to the concrete filled steel tube under the long-term axial load. This method only needs to apply the equivalent temperature load to the core concrete, simplifies the calculation and analysis process of the creep of the concrete filled steel tube. By comparing with the test results of the concrete filled steel tube creep model test, the feasibility of the method.5 is verified. By improving the ordinary particle swarm optimization, the adaptive mixing is put forward. The hybrid particle swarm optimization (PSO) algorithm is used to optimize and analyze a number of high dimensional peak functions. It is proved that the method has good robustness and search optimization accuracy. The adaptive hybrid particle swarm optimization is introduced into the optimization training of support vector machine parameters, and the support vector machine with good small sample learning ability is used to regress the concrete filled steel tube Xu Bianxiao The sensitivity coefficients of the random variables are calculated and the random analysis is carried out with Monte Carlo method. The random sensitivity analysis of two concrete filled steel tubular model tests is carried out to verify the feasibility and accuracy of the method in the stochastic analysis of concrete filled steel tube creep. The sensitivity of variable to the creep effect of concrete filled steel tube structure is.6. Based on the equivalent temperature load method, the calculation formula of temperature gradient load for the calculation of the creep effect of rectangular section concrete filled steel tube structure under the action of bending load is derived, and applied to the analysis of the creep effect of the medium bearing steel box concrete beam arch combined bridge. The mechanical and Monte Carlo method is used to analyze the randomness of the internal force, stress, and creep effect of the cross section displacement increment, and the sensitivity of the random variables to the creep effect of the medium bearing steel box concrete beam arch combined bridge is analyzed.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U441
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，本文編號：2145094
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