【摘要】：空間結(jié)構(gòu)作為衡量一個國家土建行業(yè)的標(biāo)桿,近些年有長足的發(fā)展,無論在結(jié)構(gòu)形式方面,還是在空間跨度方面,都實現(xiàn)了突破和創(chuàng)新。但是目前空間結(jié)構(gòu)還未曾突破300m跨度的局限,隨著人類剛性需求的增加,空間結(jié)構(gòu)仍然有必要朝著超大空間、超大跨度的方向發(fā)展。預(yù)應(yīng)力斜拉網(wǎng)格結(jié)構(gòu)作為空間結(jié)構(gòu)的一種獨特形式,由網(wǎng)格結(jié)構(gòu)和斜拉結(jié)構(gòu)組成,同斜拉橋同屬斜拉體系。而斜拉橋的跨度動輒上千米,因此預(yù)應(yīng)力斜拉網(wǎng)格結(jié)構(gòu)可以借鑒斜拉橋的技術(shù)經(jīng)驗朝超大跨度超大空間的方向發(fā)展,突破目前300m跨度的局限,以滿足人類對大跨度大空間結(jié)構(gòu)的要求。本文的主要任務(wù)是針對預(yù)應(yīng)力斜拉網(wǎng)格結(jié)構(gòu)進(jìn)行超大跨度的結(jié)構(gòu)可行性研究以及施工可行性研究。本文針對預(yù)應(yīng)力斜拉網(wǎng)格結(jié)構(gòu),進(jìn)行了總結(jié),包括斜拉網(wǎng)格結(jié)構(gòu)的工程應(yīng)用、發(fā)展現(xiàn)狀等。并根據(jù)己有的設(shè)計理論對斜拉網(wǎng)格結(jié)構(gòu)進(jìn)行設(shè)計分析,其中重點在于使用“未知荷載系數(shù)”法確定斜拉索索力值。在進(jìn)行完結(jié)構(gòu)設(shè)計分析后,本文對斜拉網(wǎng)格結(jié)構(gòu)的施工方法進(jìn)行了介紹,其中分為網(wǎng)格結(jié)構(gòu)的施工和斜拉結(jié)構(gòu)的施工。網(wǎng)格結(jié)構(gòu)的施工方法涵蓋了以高空散裝法、分塊滑移法、整體安裝法等為代表的傳統(tǒng)網(wǎng)格結(jié)構(gòu)施工方法以及以Pantodome體系法、液壓整體提升法、液壓整體頂升法為主的新型網(wǎng)格結(jié)構(gòu)施工方法；斜拉結(jié)構(gòu)的施工包括桁架柱的施工、斜拉索的安裝與張拉,本文也做了簡述�；谟邢拊浖﨧idas,本文對500m跨度的預(yù)應(yīng)力斜拉網(wǎng)格結(jié)構(gòu)進(jìn)行建模分析。根據(jù)《建筑結(jié)構(gòu)荷載規(guī)范》以及《鋼結(jié)構(gòu)設(shè)計規(guī)范》的相關(guān)要求,對結(jié)構(gòu)進(jìn)行設(shè)計分析�？紤]結(jié)構(gòu)恒載、活載、風(fēng)載、溫度荷載、拉索初拉力荷載以及反應(yīng)譜作用,對斜拉結(jié)構(gòu)以及網(wǎng)格結(jié)構(gòu)進(jìn)行變形驗算、承載力驗算、反力計算以及振型分析,其中結(jié)構(gòu)最大截面P1000×100,總用鋼量約7.3萬噸,平米用鋼量420kg/m2,在同級別跨度范圍內(nèi)屬于較為經(jīng)濟(jì)的結(jié)構(gòu)體系；結(jié)構(gòu)最大撓度920mm,滿足了相關(guān)規(guī)范的的要求。驗證了結(jié)構(gòu)的經(jīng)濟(jì)性、合理性、可行性；并對采用分步頂升法與液壓整體頂升法的網(wǎng)格結(jié)構(gòu)施工方案、吊裝法搭配纜風(fēng)繩的桁架柱施工方案以及采用一端牽引安裝法或者天倫循環(huán)法安裝法并基于退化補(bǔ)償法的分批次同時張拉多根拉索的拉索施工方案進(jìn)行施工模擬分析。在施工過程中,結(jié)構(gòu)所產(chǎn)生的最大位移為345mm,各個桿件的最大應(yīng)力也均低于鋼材的屈服強(qiáng)度；此外,在拉索張拉方面,選用了合理的找力分析方法以及張拉控制方法,使張拉迭代兩次便可得到設(shè)計索力值, 驗證了施工方案的安全性、合理性、可行性。
[Abstract]:As a benchmark to measure a country's civil engineering industry, spatial structure has made great progress in recent years. In terms of structure form and space span, it has achieved breakthrough and innovation. However, at present, the space structure has not broken through the limitation of 300m span. With the increase of human rigid demand, it is necessary for the space structure to develop towards the direction of super-space and super-span. As a special form of spatial structure, prestressed cable-stayed grid structure is composed of grid structure and cable-stayed structure, and the same cable-stayed bridge belongs to cable-stayed system. However, the span of cable-stayed bridge is often thousands of meters, so the prestressed cable-stayed grid structure can use the technical experience of cable-stayed bridge for reference in the direction of super-large space, and break through the limitation of 300m span at present. In order to meet the human requirements for large span and large space structure. The main task of this paper is to study the structural feasibility and construction feasibility of the prestressed cable-stayed grid structure. This paper summarizes the prestressed cable-stayed grid structure, including the engineering application and development status of the cable-stayed grid structure. According to the existing design theory, the design analysis of cable-stayed grid structure is carried out. The key point is to use the method of "unknown load coefficient" to determine the force value of cable-stayed cable. After structural design and analysis, this paper introduces the construction method of cable-stayed grid structure, which includes the construction of grid structure and the construction of cable-stayed structure. The construction methods of grid structure include the traditional grid structure construction method, such as high-altitude bulk loading method, block slip method, integral installation method, and Pantodome system method, hydraulic integral lifting method, etc. A new construction method of grid structure based on hydraulic integral lifting method; The construction of the cable-stayed structure includes the construction of the truss column, the installation and tensioning of the stay cables. Based on the finite element software Midas, this paper models and analyzes the prestressed cable-stayed grid structure with 500 m span. According to the requirements of the Code of load for Building structures and the Code for Design of Steel structures, the design of structures is analyzed. Considering the effects of dead load, live load, wind load, temperature load, cable initial tension load and response spectrum, the deformation check, bearing capacity calculation, reaction force calculation and mode analysis of cable-stayed structure and grid structure are carried out. The maximum cross section P1000 脳 100, the total steel consumption is about 73000 tons, and the square rice steel is 420 kg / m ~ 2, which belongs to the more economical structure system in the same span range. The maximum deflection of the structure is 920mm, which meets the requirements of the relevant specifications. The economy, rationality and feasibility of the structure are verified. And the construction scheme of grid structure with stepwise lifting method and hydraulic integral lifting method is discussed. The construction scheme of truss column with cable wind rope by hoisting method and the cable construction scheme by using one-end traction installation method or Tianlun cycle method and based on the degradation compensation method are analyzed. In the construction process, the maximum displacement of the structure is 345mm, and the maximum stress of each member is lower than the yield strength of steel. In addition, in the aspect of cable tension, reasonable force finding analysis method and tension control method are selected, so that the design cable force value can be obtained twice by tension iteration, which verifies the safety, rationality and feasibility of the construction scheme.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU399;TU745

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