【摘要】：針對近年來橋梁建設(shè)過程中出現(xiàn)的問題,以及橋梁施工中積累的經(jīng)驗和技術(shù),交通部于2015年頒布了系列規(guī)范,以解決原規(guī)范在新時期的適應(yīng)性問題。作為橋梁設(shè)計的指導(dǎo)性文件,《公路橋涵設(shè)計通用規(guī)范》(JTG D60-2015)和《公路鋼筋混凝土及預(yù)應(yīng)力混凝土橋涵設(shè)計規(guī)范》(JTG D62-2015)的修訂對我國廣泛使用的中小跨徑混凝土梁橋的設(shè)計影響很大。論文結(jié)合交通運輸部頒布的《通用圖》選取常用標(biāo)準(zhǔn)跨徑簡支板和簡支T梁作為樣本進行設(shè)計計算,對新舊橋梁規(guī)范修訂部分進行了對比、研究,并評估了新規(guī)范下《通用圖》的適用性。主要完成內(nèi)容如下:(1)論文通過對新舊規(guī)范的學(xué)習(xí)、理解和分析,歸納總結(jié)了新規(guī)范在材料取用、荷載效應(yīng)及其組合方式、抗裂驗算、撓度計算等方面的修訂,著重討論了新舊規(guī)范汽車荷載及其相關(guān)系數(shù)取值的差異。(2)對樣本橋梁在新舊規(guī)范下分別進行承載能力極限狀態(tài)和正常使用極限狀態(tài)計算。根據(jù)持久狀況和短暫狀況計算,得到作用效應(yīng)、截面承載力、應(yīng)力及撓度等計算數(shù)據(jù),并進行對比分析。結(jié)果表明:新規(guī)范顯著提高了中小跨徑簡支梁橋的內(nèi)力設(shè)計值,其中跨中彎矩設(shè)計值最大增幅達30%。同時,新規(guī)范通過對公式及荷載效應(yīng)的修訂,提高了對構(gòu)件裂縫寬度、抗裂性的控制,簡化了鋼筋混凝土板橋的撓度計算。(3)依據(jù)上述計算結(jié)果驗算了新規(guī)范下《通用圖》的適用性。研究表明:對鋼筋混凝土板橋,《通用圖》不滿足承載力要求;對預(yù)應(yīng)力混凝土梁橋,《通用圖》可繼續(xù)適用,但安全儲備有所減小。該研究可為橋梁設(shè)計人員參考《通用圖》設(shè)計提供理論依據(jù),并為原橋梁在新規(guī)范標(biāo)準(zhǔn)下能否繼續(xù)服役提供參考。
[Abstract]:In view of the problems in the process of bridge construction in recent years, as well as the experience and technology accumulated in the bridge construction, the Ministry of Communications issued a series of specifications in 2015 to solve the adaptability of the original code in the new period. As a guiding document for bridge design, the revision of the General Code for Highway Bridge and culvert Design (JTG D60-2015) and the Design Code for Highway reinforced concrete and Prestressed concrete Bridges and culverts (JTG D62-2015) has a great impact on the design of medium and small span concrete beam bridges widely used in China. Combined with the "General drawing" issued by the Ministry of Communications and Transport, the standard span simply supported plate and simply supported T-beam are selected as samples for design and calculation, and the revised part of new and old bridge code is compared and studied. The applicability of Universal Diagram under the new specification is evaluated. The main contents are as follows: (1) through the study, understanding and analysis of the new and old codes, the paper summarizes the revision of the new code in the aspects of material use, load effect and its combination, crack checking calculation, deflection calculation, etc. The difference of vehicle load and its correlation coefficient between old and new codes is discussed emphatically. (2) the limit state of bearing capacity and the limit state of normal use of the sample bridges are calculated under the new and old codes respectively. According to the calculation of the lasting and transient conditions, the calculated data of the action effect, the bearing capacity of the section, the stress and the deflection are obtained, and the results are compared and analyzed. The results show that the design value of internal force of small and medium span simply supported beam bridge is improved remarkably by the new code, and the maximum increase of the design value of mid-span moment is as high as 30%. At the same time, the new code improves the control of crack width and crack resistance by revising the formula and load effect. The deflection calculation of reinforced concrete slab bridge is simplified. (3) based on the above calculation results, the applicability of the general drawing under the new code is calculated. The results show that the universal drawing can not meet the bearing capacity requirement for reinforced concrete slab bridges, and the general drawing can be used for prestressed concrete beam bridges, but the safety reserve is reduced. The research can provide a theoretical basis for bridge designers to refer to the design of the Universal Diagram, as well as a reference for whether the original bridge can continue to be in service under the new standard.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U442.5

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