發(fā)布時(shí)間：2018-03-13 04:24

  本文選題：弧形鋼板副格　切入點(diǎn)：榫槽　出處：《河北工業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：港珠澳大橋的東西人工島基坑圍護(hù)工程采用大直徑鋼圓筒結(jié)構(gòu)，相鄰圓筒間使用兩道弧形鋼板副格連接。此結(jié)構(gòu)施工方式簡(jiǎn)便、效率高，工序少，可以對(duì)弧形鋼板進(jìn)行工廠化制作后再整體運(yùn)輸至現(xiàn)場(chǎng)施工，施工難度和材料成本均大幅度降低，所形成的圍堰島壁的止水性能佳，結(jié)構(gòu)穩(wěn)定性好。 本文首先介紹了弧形鋼板副格結(jié)構(gòu)受力分析時(shí)所采用的三種經(jīng)典土壓力理論以及幾種常見(jiàn)情況下土壓力的計(jì)算方法。然后通過(guò)陸地試驗(yàn)對(duì)弧形鋼板副格結(jié)構(gòu)不同工況下的結(jié)構(gòu)靜力分析研究可知，副格振沉完成后試驗(yàn)用榫槽、副格鋼材均未發(fā)生屈服現(xiàn)象，而當(dāng)灌水、灌砂后個(gè)別測(cè)點(diǎn)出現(xiàn)了應(yīng)力過(guò)大的情況，說(shuō)明在實(shí)際工程中，副格結(jié)構(gòu)在振動(dòng)下沉完成后的中粗砂回填施工中有可能出現(xiàn)破壞現(xiàn)象。其次根據(jù)設(shè)計(jì)資料和實(shí)際工況，采用有限元分析方法，針對(duì)不同埋深的副格結(jié)構(gòu)進(jìn)行分析。由分析結(jié)果得知三種高度下的副格結(jié)構(gòu)都沒(méi)有發(fā)生屈服，寬榫槽是此結(jié)構(gòu)中受力最大的部位。 根據(jù)試驗(yàn)結(jié)果以及有限元分析結(jié)果，提出副格設(shè)計(jì)優(yōu)化建議：當(dāng)副格倉(cāng)內(nèi)水頭超過(guò)一定高度時(shí)，加密榫槽和鋼管樁間的jk肋，增加榫槽的剛度；在高水頭下，鋼管樁焊接榫槽的位置可能出現(xiàn)應(yīng)力集中，建議在該位置布置縱向加強(qiáng)板，，改善應(yīng)力的分布情況；實(shí)際工況下，應(yīng)合理控制副格艙內(nèi)的水位；為保證結(jié)構(gòu)的安全可靠，在弧形鋼板副格結(jié)構(gòu)高度改變時(shí)，可以適當(dāng)加密榫槽加勁肋。
[Abstract]:The large diameter steel cylinder structure is used in the construction of the East and West artificial Island Foundation Pit of Hongkong-Zhuhai-Macao Bridge, and two arc-shaped steel plates are used to connect the adjacent cylinders. This structure is simple in construction, high in efficiency and less in working procedures. The arc steel plate can be manufactured by factory and then transported to the site. The construction difficulty and material cost are greatly reduced. The wall of the cofferdam has good sealing performance and good structural stability. In this paper, three kinds of classical earth pressure theory and the calculation methods of earth pressure in some common cases are introduced in the stress analysis of arc-shaped steel plate pair lattice structure. Then, the arc steel plate pair lattice structure is not analyzed by land test. The static analysis of the structure under the same working condition shows that, After the vibration sinking of auxiliary lattice is finished, the tenon and tenon groove of auxiliary lattice steel are not yielding, but the stress is too large at some measuring points after irrigation and sand filling, which shows that in the actual engineering, The secondary lattice structure may be destroyed in the middle coarse sand backfill construction after vibration sinking. Secondly, according to the design data and actual working conditions, the finite element analysis method is used. According to the analysis of pair structure with different depth of burying depth, the results show that none of the pair lattice structures at three different heights has yield, and the wide tenon groove is the most stressed part of the structure. According to the test results and the finite element analysis results, the optimum design suggestion of the auxiliary lattice is put forward: when the water head in the pair box exceeds a certain height, the jk rib between the encrypted tenon groove and the steel pipe pile increases the stiffness of the tenon groove; under the high water head, the stiffness of the tenon groove is increased. The stress concentration may appear in the position of welded tenon groove of steel pipe pile. It is suggested that the longitudinal stiffening plate should be arranged in this position to improve the distribution of stress. In actual working conditions, the water level in the auxiliary compartment should be controlled reasonably; in order to ensure the safety and reliability of the structure, When the height of the curved steel plate pair is changed, the stiffening rib can be properly encrypted.
【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U441

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相關(guān)碩士學(xué)位論文 前1條

1 劉小嬌;港珠澳大橋弧形鋼板副格受力分析[D];河北工業(yè)大學(xué);2014年

本文編號(hào)：1604806