基于施工質(zhì)量的大跨徑鋼箱梁懸索橋成橋安全狀態(tài)評(píng)估
發(fā)布時(shí)間：2018-09-06 11:49
【摘要】：中國(guó)境內(nèi)多高山大河深谷等復(fù)雜地形,修建懸索橋具有較大優(yōu)勢(shì)。懸索橋構(gòu)件繁多,施工專(zhuān)業(yè)化程度高。雖然中國(guó)在懸索橋施工技術(shù)層面已經(jīng)處在世界領(lǐng)先水平,但是在施工過(guò)程質(zhì)量變異不可避免,即施工質(zhì)量與設(shè)計(jì)要求存在偏差。目前針對(duì)懸索橋施工過(guò)程中存在的施工質(zhì)量變異類(lèi)型、程度和成因以及施工質(zhì)量變異對(duì)成橋狀態(tài)的影響方式和影響的程度的研究還比較少。以施工質(zhì)量變異性為全新視角,基于施工質(zhì)量變異性對(duì)成橋安全狀態(tài)的影響評(píng)價(jià)大跨徑鋼箱梁懸索橋成橋安全狀態(tài),將橋梁安全狀態(tài)評(píng)估從成橋后的外觀和荷載試驗(yàn)檢測(cè)拓展至施工階段的質(zhì)量控制環(huán)節(jié)。以云南鋼箱梁懸索橋?yàn)橐劳?通過(guò)跟蹤調(diào)查山區(qū)大跨徑鋼箱梁懸索橋施工過(guò)程,結(jié)合現(xiàn)場(chǎng)大量線(xiàn)形、內(nèi)力、應(yīng)力等數(shù)據(jù)采集試驗(yàn),系統(tǒng)研究了施工過(guò)程中主塔、主纜、索夾與吊桿、錨碇、鋼箱加勁梁等構(gòu)件質(zhì)量變異的主要類(lèi)型、程度及發(fā)生質(zhì)量變異的原因,結(jié)果表明有14種多發(fā)性施工質(zhì)量變異類(lèi)型。通過(guò)有限元計(jì)算分析了施工質(zhì)量變異對(duì)成橋安全度的影響方式,量化分析了施工質(zhì)量偏差對(duì)懸索橋成橋狀態(tài)的影響程度。研究了主塔混凝土強(qiáng)度變異性,幾何尺寸偏差、主塔傾斜度對(duì)主塔截面應(yīng)力的影響;主塔頂面水平和高程偏位、主纜架設(shè)精度、主纜截面有效受力面積對(duì)主纜受力狀態(tài)的影響;主纜錨跨錨固連接器偏角對(duì)拉桿應(yīng)力的影響;索夾偏位及吊桿長(zhǎng)度偏差對(duì)主纜、吊桿內(nèi)力的影響;鋼箱加勁梁自重對(duì)主纜、吊桿等構(gòu)件內(nèi)力的影響和鋼箱梁焊接殘余應(yīng)力對(duì)焊縫應(yīng)力的影響程度。同時(shí)分析了構(gòu)件內(nèi)力對(duì)各種質(zhì)量變異的敏感程度,并以此界定了不同類(lèi)型施工質(zhì)量變異性對(duì)成橋安全度的影響程度,得出了9種懸索橋施工質(zhì)量變異的主控類(lèi)型。提出了涵蓋質(zhì)量變異主控類(lèi)型,以構(gòu)件安全儲(chǔ)備量為目標(biāo)的,針對(duì)主塔、主纜、吊桿、加勁梁和錨固拉桿安全度的6個(gè)安全評(píng)價(jià)指標(biāo),即主塔混凝土抗壓安全度(Tt)、主塔混凝土抗拉安全度(Tp)、主纜安全度(C)、吊桿抗拉安全度(D)、拉桿安全度(L)、鋼箱梁應(yīng)力安全度(G)作為懸索橋初始安全度評(píng)價(jià)指標(biāo),引入主成分分析法對(duì)評(píng)價(jià)指標(biāo)降維處理并綜合評(píng)分,實(shí)現(xiàn)了大跨徑鋼箱梁懸索橋橋成橋安全狀態(tài)量化評(píng)價(jià)。結(jié)果表明,綜合評(píng)分值能夠充分反映基于施工質(zhì)量的懸索橋初始安全狀態(tài),主成分綜合評(píng)分越高,其安全度越高,綜合評(píng)分值越低,其安全度越低,采用主成分分析法評(píng)價(jià)懸索橋初始安全狀態(tài)可行且結(jié)果可靠。
[Abstract]:There are many high mountains, big rivers, deep valleys and other complicated terrain in China, so the construction of suspension bridge has great advantages. Suspension bridge has many components and high degree of construction specialization. Although China is already leading the world in the construction technology of suspension bridge, the quality variation in the construction process is inevitable, that is, the deviation between the construction quality and the design requirements. At present, there are few researches on the type, degree and cause of construction quality variation in the construction of suspension bridge, as well as the influence mode and influence degree of construction quality variation on the state of completed bridge. Based on the influence of construction quality variability on bridge safety, the safety status of long-span steel box girder suspension bridge is evaluated from the perspective of construction quality variability. The evaluation of bridge safety condition is extended from appearance and load test after completion to quality control in construction stage. Based on Yunnan steel box girder suspension bridge, the construction process of long span steel box girder suspension bridge in mountainous area was investigated, and the main tower and cable in the construction process were systematically studied by combining with a large number of data collection tests, such as line shape, internal force and stress, etc. The main types, degrees and causes of quality variation of cable clamps and suspenders, anchorages and stiffened steel box beams are discussed. The results show that there are 14 kinds of multiple construction quality variation types. The influence of construction quality variation on the safety degree of suspension bridge is analyzed by finite element method, and the influence of construction quality deviation on the state of suspension bridge is analyzed quantitatively. The influence of concrete strength variability, geometric dimension deviation and inclination of the main tower on the stress of the main tower section, the horizontal and elevation deflection of the top plane of the main tower, the erection accuracy of the main cable and the effective force area of the main cable section on the stress state of the main cable are studied. The influence of the deflection angle of anchor cable span anchor connector on the stress of pull rod, the influence of deviation of cable clip and length of suspender on the internal force of main cable and suspender, the self-weight of steel box stiffening beam on main cable, The influence of the internal force of the suspender and the welding residual stress of the steel box girder on the weld stress. At the same time, the sensitivity of component internal force to various quality variation is analyzed, and the influence degree of different types of construction quality variability on the safety degree of completed bridge is defined, and nine main control types of construction quality variation of suspension bridge are obtained. Six safety evaluation indexes for the safety degree of main tower, main cable, suspender, stiffened beam and anchor pull rod are proposed, which cover the main control type of quality variation and take the safety reserve of component as the target, and the safety evaluation index of the main tower, main cable, suspender rod, stiffened beam and Anchorage pull rod is put forward. That is, the main tower concrete compressive safety degree (Tt), main tower concrete tension safety degree (Tp), main cable safety degree (C), cable tension safety degree (D), tension bar safety degree (L), steel box girder stress safety degree (G) is used as the initial safety evaluation index of suspension bridge. By introducing principal component analysis (PCA) to reduce the dimension of the evaluation index and synthetically evaluate the safety state of the long span steel box girder suspension bridge, the quantitative evaluation of the safety state of the completed bridge is realized. The results show that the comprehensive score value can fully reflect the initial safety state of suspension bridge based on construction quality. The higher the principal component comprehensive score, the higher the safety degree, the lower the comprehensive score value and the lower the safety degree. It is feasible and reliable to use principal component analysis to evaluate the initial safe state of suspension bridge.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U448.25
本文編號(hào)：2226260
[Abstract]:There are many high mountains, big rivers, deep valleys and other complicated terrain in China, so the construction of suspension bridge has great advantages. Suspension bridge has many components and high degree of construction specialization. Although China is already leading the world in the construction technology of suspension bridge, the quality variation in the construction process is inevitable, that is, the deviation between the construction quality and the design requirements. At present, there are few researches on the type, degree and cause of construction quality variation in the construction of suspension bridge, as well as the influence mode and influence degree of construction quality variation on the state of completed bridge. Based on the influence of construction quality variability on bridge safety, the safety status of long-span steel box girder suspension bridge is evaluated from the perspective of construction quality variability. The evaluation of bridge safety condition is extended from appearance and load test after completion to quality control in construction stage. Based on Yunnan steel box girder suspension bridge, the construction process of long span steel box girder suspension bridge in mountainous area was investigated, and the main tower and cable in the construction process were systematically studied by combining with a large number of data collection tests, such as line shape, internal force and stress, etc. The main types, degrees and causes of quality variation of cable clamps and suspenders, anchorages and stiffened steel box beams are discussed. The results show that there are 14 kinds of multiple construction quality variation types. The influence of construction quality variation on the safety degree of suspension bridge is analyzed by finite element method, and the influence of construction quality deviation on the state of suspension bridge is analyzed quantitatively. The influence of concrete strength variability, geometric dimension deviation and inclination of the main tower on the stress of the main tower section, the horizontal and elevation deflection of the top plane of the main tower, the erection accuracy of the main cable and the effective force area of the main cable section on the stress state of the main cable are studied. The influence of the deflection angle of anchor cable span anchor connector on the stress of pull rod, the influence of deviation of cable clip and length of suspender on the internal force of main cable and suspender, the self-weight of steel box stiffening beam on main cable, The influence of the internal force of the suspender and the welding residual stress of the steel box girder on the weld stress. At the same time, the sensitivity of component internal force to various quality variation is analyzed, and the influence degree of different types of construction quality variability on the safety degree of completed bridge is defined, and nine main control types of construction quality variation of suspension bridge are obtained. Six safety evaluation indexes for the safety degree of main tower, main cable, suspender, stiffened beam and anchor pull rod are proposed, which cover the main control type of quality variation and take the safety reserve of component as the target, and the safety evaluation index of the main tower, main cable, suspender rod, stiffened beam and Anchorage pull rod is put forward. That is, the main tower concrete compressive safety degree (Tt), main tower concrete tension safety degree (Tp), main cable safety degree (C), cable tension safety degree (D), tension bar safety degree (L), steel box girder stress safety degree (G) is used as the initial safety evaluation index of suspension bridge. By introducing principal component analysis (PCA) to reduce the dimension of the evaluation index and synthetically evaluate the safety state of the long span steel box girder suspension bridge, the quantitative evaluation of the safety state of the completed bridge is realized. The results show that the comprehensive score value can fully reflect the initial safety state of suspension bridge based on construction quality. The higher the principal component comprehensive score, the higher the safety degree, the lower the comprehensive score value and the lower the safety degree. It is feasible and reliable to use principal component analysis to evaluate the initial safe state of suspension bridge.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U448.25
【參考文獻(xiàn)】
相關(guān)期刊論文 前4條
1 李波;韓森;徐鷗明;滕旭秋;;基于主成分分析法的瀝青路面使用性能評(píng)價(jià)[J];長(zhǎng)安大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年03期
2 羅喜恒;肖汝誠(chéng);項(xiàng)海帆;;幾何非線(xiàn)性問(wèn)題求解的改進(jìn)算法[J];公路交通科技;2005年12期
3 王永平，張寶銀，張樹(shù)仁;橋梁使用性能模糊評(píng)估專(zhuān)家系統(tǒng)[J];中國(guó)公路學(xué)報(bào);1996年02期
4 孫光亮;多層次綜合評(píng)判模型及其應(yīng)用[J];系統(tǒng)工程;1996年02期
，本文編號(hào)：2226260
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