本文選題：預(yù)應(yīng)力混凝土 + T形剛構(gòu)橋��； 參考：《長(zhǎng)安大學(xué)》2015年碩士論文

【摘要】：20世紀(jì)70年代末至90年代初,我國(guó)修建了大量預(yù)應(yīng)力混凝土T形剛構(gòu)橋梁,這些早期建造的橋梁隨著使用年限增長(zhǎng),由于交通運(yùn)輸量增大、基礎(chǔ)沉降、車輛超載、養(yǎng)護(hù)不當(dāng)?shù)仍?部分橋梁出現(xiàn)了大量的病害和破損,而引發(fā)安全隱患。本文以山東省臺(tái)兒莊馬蘭公路大橋?yàn)楣こ瘫尘?采用模型仿真分析和靜動(dòng)力性能試驗(yàn)兩種方法,對(duì)該橋的靜動(dòng)力性能進(jìn)行了研究。主要研究?jī)?nèi)容及結(jié)論如下:首先對(duì)依托工程進(jìn)行介紹,闡述了該橋的現(xiàn)狀概況,采用Midas Civil 8.2.1軟件對(duì)該橋進(jìn)行模型仿真分析,主要分析了最大懸臂端撓度的影響因素,為后續(xù)的加固改造提供建議,依據(jù)《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計(jì)規(guī)范》(JTG D62-2004)主要分析了承載能力極限狀態(tài)主梁控制截面的抗彎承載能力和抗剪承載能力、驗(yàn)算了正常使用極限狀態(tài)下主梁的主拉應(yīng)力和撓度以及持久狀況下主梁的正應(yīng)力和主應(yīng)力,結(jié)果表明除了主拉應(yīng)力外,分析計(jì)算的內(nèi)容均滿足規(guī)范要求。設(shè)計(jì)該橋靜力性能試驗(yàn)方案,按照設(shè)計(jì)的試驗(yàn)方案進(jìn)行加載和卸載,對(duì)大橋在各個(gè)試驗(yàn)工況下,控制截面應(yīng)力和試驗(yàn)測(cè)點(diǎn)撓度的實(shí)測(cè)值與靜力分析得到的理論值進(jìn)行分析和比較,結(jié)果表明該橋的彈性性能較差處于彈塑性工作狀態(tài)。對(duì)該橋進(jìn)行動(dòng)力性能試驗(yàn),首先用有限元軟件進(jìn)行動(dòng)力特性分析,針對(duì)動(dòng)力分析的前5階模態(tài),然后設(shè)計(jì)該橋的動(dòng)力性能試驗(yàn)方案,將大橋動(dòng)力性能試驗(yàn)的各個(gè)試驗(yàn)工況下測(cè)得的數(shù)據(jù)與理論數(shù)據(jù)對(duì)比分析,動(dòng)力性能研究表明實(shí)橋整體剛度小于設(shè)計(jì)值,其上存在開(kāi)裂或缺陷損傷部位。最后利用反應(yīng)譜的分析方法對(duì)大橋的在地震作用下的響應(yīng)進(jìn)行研究,設(shè)計(jì)了4種工況,分別計(jì)算了該橋在E1和E2地震作用下主梁墩頂截面和墩底截面的彎矩和剪力以及最大懸臂端和墩頂三個(gè)方向上的位移并對(duì)提取的數(shù)據(jù)進(jìn)行分析,發(fā)現(xiàn)各個(gè)方向上的地震動(dòng)對(duì)各個(gè)方向上地震響應(yīng)的影響規(guī)律,依據(jù)《公路橋梁抗震設(shè)計(jì)細(xì)則》(JTG/T B02-01-2008)對(duì)該橋的橋墩進(jìn)行驗(yàn)算,驗(yàn)算結(jié)果表明該橋在地震作用下橋墩抗彎性能、墩底塑性鉸區(qū)斜截面抗剪性能以及橋墩橫橋向位移均滿足規(guī)范要求。
[Abstract]:From the late 1970s to the early 1990s, a large number of prestressed concrete T-shaped rigid frame bridges were built in our country. With the increase of service life, these early bridges were built because of the increase of traffic volume, the settlement of foundation and the overload of vehicles. Improper maintenance and other reasons, some bridges appear a large number of diseases and damage, and lead to safety risks. In this paper, based on the engineering background of Ma Lan Highway Bridge in Taierzhuang, Shandong Province, the static and dynamic performance of the bridge is studied by two methods: model simulation analysis and static and dynamic performance test. The main research contents and conclusions are as follows: firstly, the paper introduces the supporting engineering, expounds the current situation of the bridge, analyzes the model of the bridge by using Midas Civil 8.2.1 software, and mainly analyzes the influence factors of the maximum cantilever deflection. According to the Design Code for reinforced concrete and Prestressed concrete Bridges and culverts of Highway (JTG D62-2004), the flexural bearing capacity and shear bearing capacity of the control section of the main beam under the limit state of bearing capacity are analyzed. The main tensile stress and deflection of the main beam under the normal service limit state and the normal stress and the principal stress of the main beam under the lasting condition are checked and calculated. The results show that the contents of the analysis and calculation all meet the requirements of the code except the main tensile stress. The static performance test scheme of the bridge was designed, and the bridge was loaded and unloaded according to the designed test scheme. The measured values of the controlled section stress and the deflection of the test point are analyzed and compared with the theoretical values obtained from the static analysis. The results show that the elastic properties of the bridge are poor in the elastic-plastic state. In the dynamic performance test of the bridge, the dynamic characteristics of the bridge are analyzed by finite element software, and then the dynamic performance test scheme of the bridge is designed for the first five modes of the dynamic analysis. The dynamic performance of the bridge under different test conditions is compared with the theoretical data. The dynamic performance study shows that the overall stiffness of the bridge is less than the design value and there are cracks or defects on the bridge. Finally, the response of the bridge under earthquake action is studied by using the method of response spectrum analysis, and four working conditions are designed. The bending moment and shear force of the top section and the bottom section of the main girder pier under E1 and E2 earthquakes were calculated, and the displacement of the maximum cantilever end and the pier top in three directions were calculated, and the extracted data were analyzed. The influence of ground motion in every direction on the seismic response in each direction is found. The pier of the bridge is checked and calculated according to the detailed rules for Seismic Design of Highway Bridges (JTG / T B02-01-2008). The results show that the flexural behavior of the pier of the bridge is affected by earthquake. The shear resistance of inclined section and the displacement of bridge pier in plastic hinge region meet the requirements of specifications.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U448.23

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