本文選題：弦支穹頂 + 施工支承架　； 參考：《天津大學》2011年博士論文

【摘要】：弦支穹頂是一種高效的預應力空間鋼結構,已推廣用于體育館、會展中心等近20項大跨度建筑工程中。隨著工程應用的推廣和研究的深入,在施工控制技術與分析設計理論方面遇到了一些亟待解決的關鍵課題,包括弦支穹頂結構臨時支承結構的分析設計理論、考慮溫度變化和滑移摩擦影響的弦支穹頂?shù)念A應力施工過程數(shù)值模擬與控制理論、太陽輻射作用下弦支穹頂結構溫度荷載的數(shù)值模擬理論及其溫度效應研究等,這些課題解決的好壞,直接影響到弦支穹頂?shù)慕Y構效能、工程造價及施工階段和使用階段的安全等問題。本文圍繞上述問題,采用數(shù)值分析與試驗研究相結合的方法,開展了系統(tǒng)深入的分析研究,取得了一些具有科學意義和工程應用價值的研究成果。 弦支穹頂施工時通常會采用扣件式鋼管滿堂支承架作為結構和施工荷載的臨時支承,而目前扣件式鋼管滿堂支承架半剛性分析計算理論尚不完善,由此帶來了很多問題,甚至工程事故。結合行業(yè)標準《扣件式鋼管腳手架安全技術規(guī)范》(JGJ 130-2001)修訂工作,通過足尺試驗和理論分析對扣件式鋼管滿堂支承架的結構力學特點、分析方法及其設計理論進行了深入的研究,提出了一套完整的扣件式鋼管滿堂支承架的數(shù)值模擬理論和簡化計算方法,揭示了各個參數(shù)對結構穩(wěn)定性能的影響規(guī)律,相關研究成果已編入行業(yè)標準《扣件式鋼管腳手架安全技術規(guī)范》(JGJ 130-2011)。 在弦支穹頂結構預應力張拉施工過程中,環(huán)索與撐桿下節(jié)點之間的滑移摩擦引起顯著的預應力張拉偏差,給結構帶來了一定的安全隱患。為系統(tǒng)深入的研究滑移摩擦導致的預應力偏差及其對結構性能的影響,本文基于拉索的熱脹冷縮原理及其泛函廣義逆的概念,考慮滑移摩擦建立了環(huán)索繞撐桿下節(jié)點滑移的數(shù)值模擬理論,通過ANSYS的APDL語言編程實現(xiàn);同時基于有限元基礎理論,推導了基于有限元列式的三節(jié)點滑移索單元和閉合多滑輪滑移索單元的剛度矩陣、質量矩陣,通過商用有限元軟件ABAQUS的用戶自定義單元功能,將單元算法用于計算機手段進行實現(xiàn)索滑移的數(shù)值模擬。通過算例和試驗驗證上述三種索滑移數(shù)值模擬理論的合理性。利用上述理論,分別研究了滑移摩擦導致的預應力偏差的分布規(guī)律、偏差對弦支穹頂結構性能的影響、環(huán)索滑移與不滑移時結構性能的對比分析等內容,得出了一些可供工程參考的結論。 在弦支穹頂結構預應力施工期間,環(huán)境溫度與結構溫度是不斷變化的,并且變化的幅度較大,給結構的預應力張拉的精確施工帶來技術難題。本文首先通過算例分析得出由預應力張拉期間環(huán)境溫度變化引起顯著的預應力張拉誤差,誤差可達212%,因此必須考慮環(huán)境溫度的變化對預應力施工的影響。為考慮施工期間環(huán)境溫度的變化對預應力施工的影響,本文提出了循環(huán)補償法和簡化線性方法來考慮施工過程中環(huán)境溫度變化對預應力張拉施工的影響,通過算例對方法的合理性和精度進行了驗證。 在弦支穹頂結構的施工階段和使用階段,其結構本身的溫度場是一個不斷變化的過程。溫度作用作為一種特殊的荷載,與重力荷載、風荷載、地震作用等常規(guī)荷載有著本質的不同,后者可通過增強結構的剛度來有效抵抗,但是前者卻不然,剛度越大,溫度作用引起的內力就越大,因此對于溫度作用引起的內力不能僅靠增加結構的剛度來抵抗。本文采用有限元理論研究了溫度作用對弦支穹頂?shù)念A應力大小、節(jié)點位移、桿件內力和支座反力的影響,揭示了拉索材料和支座約束剛度對溫度作用下弦支穹頂結構性能的影響規(guī)律。 在弦支穹頂結構的施工階段和使用階段,其結構溫度場不僅受到環(huán)境空氣溫度的影響,而且還受到太陽輻射的影響,太陽輻射作用下,結構表面的溫度可超出環(huán)境空氣溫度20℃之上,若設計和施工過程中不能合理的考慮結構的溫度場,將會引起安全隱患。本文基于有限元理論,建立太陽輻射作用下鋼結構溫度場數(shù)值模擬方法,并提出了一種高效的太陽陰影計算方法。采用本文建立的數(shù)值模擬和陰影計算方法采用ASHRAE晴空輻射模型,建立了太陽輻射作用下鋼結構的溫度場分析模型,研究了鋼板太陽輻射吸收系數(shù)、地面輻射反射系數(shù)、構件規(guī)格和空間方位對結構溫度場的影響,完成了鋼板、鋼管、箱型鋼管和H型鋼四組太陽輻射下鋼構件的溫度場試驗,驗證了理論分析模型和簡化計算方法的有效性和合理性。利用本文提出的太陽輻射下鋼結構溫度場數(shù)值模擬方法,研究了太陽輻射下弦支穹頂和弦支穹頂疊合拱結構的溫度場分布規(guī)律,并揭示了此溫度場下弦支穹頂?shù)慕Y構響應規(guī)律。
[Abstract]:The chord dome is a kind of high efficient prestressed space steel structure, which has been popularized in the gymnasium, exhibition center and other 20 long-span construction projects. With the popularization and research of the engineering application, some key problems which need to be solved in the construction control technology and the theory of analysis and design are encountered, including the temporary support of the stringed dome structure. The numerical simulation and control theory of the prestressed construction process of the chord dome under the influence of temperature change and sliding friction, the numerical simulation theory of the temperature load of the chord dome structure under the action of solar radiation and the study of the temperature effect on the chord dome structure under the effect of solar radiation, and so on, which directly affect the knot of the chord dome. Structure efficiency, construction cost and construction stage and safety of use stage. This paper, based on the above problems, adopts the method of combining numerical analysis with experimental research to carry out systematic in-depth analysis and research, and has obtained some research achievements with scientific significance and engineering application value.
In the construction of the stringed dome, the full support frame of the fastener type steel tube is usually used as the temporary support for the structure and the construction load. At present, the theory of the semi rigid analysis and calculation of the full support frame of the fastener type steel pipe is not yet perfect, so many problems, even the engineering accidents, are brought up, and the safety technical specification of the fastener type steel tube scaffold > (J GJ 130-2001) revise work. Through full scale test and theoretical analysis, the structural mechanics characteristics, analysis method and design theory of the full support frame of the fastener type steel pipe are deeply studied. A complete set of numerical simulation theory and simplified calculation method of the full fastener type steel pipe full support frame is put forward, and the structure stability of each parameter is revealed. The relevant research results have been incorporated into the industry standard < Safety Specification for fastener style steel pipe scaffolds > > (JGJ 130-2011).
In the process of prestressed tension construction of the stringed dome structure, the slip friction between the ring and the bracing rod causes significant prestress tension deviation, which brings a certain safety hidden danger to the structure. It is based on the thermal expansion and cold contraction of the cable in this paper to study the prestress deviation and its influence on the structure performance. The principle and the concept of the functional generalized inverse are considered, and the sliding friction is considered to establish the numerical simulation theory of the slip of the node under the ring wound pole, and is realized by the APDL language programming of ANSYS. At the same time, based on the finite element theory, the stiffness matrix of the three node slip cable element and the closed multi pulley slip cable element based on the finite element method is derived, and the mass of the slip cable element is derived. By using the user defined unit function of the commercial finite element software ABAQUS, the element algorithm is used to simulate the numerical simulation of the slip of the cable. The rationality of the three kinds of cable slip numerical simulation theory is verified by an example and experiment. The influence of the distribution law and deviation on the structural properties of the chord dome, the comparison and analysis of the structural properties of the ring cable slip and the non slip structure are given, and some conclusions can be obtained for the engineering reference.
During the prestressed construction of the stringed dome, the temperature of the environment and the structure temperature are constantly changing, and the amplitude of the change is large, which brings the technical difficulties to the precise construction of the prestressed tensioning structure. It is up to 212%, so it is necessary to consider the influence of the change of ambient temperature on the prestress construction. In order to consider the influence of the change of the ambient temperature on the prestress construction during the construction period, this paper proposes the cyclic compensation method and the simplified linear method to consider the influence of the environmental temperature change on the pre stress tensioning construction during the construction process. The rationality and accuracy are verified.
The temperature field of the structure itself is a changing process in the construction and use stages of the stringed dome. As a special load, the temperature action is essentially different from the conventional loads, such as gravity load, wind load, and earthquake action, and the latter can be effectively resisted by the stiffness of the strengthening structure, but the former is not. The greater the stiffness, the greater the internal force caused by the temperature action, so the internal force caused by the temperature action can not be resisted only by increasing the stiffness of the structure. In this paper, the effect of temperature action on the size of the prestress, the displacement of the joint, the internal force of the rod and the counterforce of the support are studied by the finite element theory, and the material and support of the cable are revealed. The influence of beam stiffness on the performance of suspended dome structure under temperature.
The structure temperature field is not only influenced by ambient air temperature, but also influenced by the solar radiation. Under the action of solar radiation, the temperature of the structure surface can exceed the ambient air temperature of 20 degrees C. If the temperature field of the structure can not be considered reasonably in the design and application process, the temperature field of the structure will not be considered reasonably. This paper, based on the finite element theory, establishes a numerical simulation method for the temperature field of steel structure under the action of solar radiation, and puts forward a high efficient calculation method of the sun shadow. By using the numerical simulation and shadow calculation method established in this paper, the ASHRAE clear air radiation model is used to establish the temperature of the steel structure under the action of the solar radiation. The effect of the solar radiation absorption coefficient, the ground radiant reflection coefficient, the component specification and the spatial orientation on the temperature field of the structure is studied by the field analysis model. The temperature field test of four groups of steel members under the solar radiation of steel plate, steel tube, box type steel tube and H type steel is completed. The validity and rationality of the theoretical analysis model and the simplified calculation method are verified. By using the numerical simulation method of the temperature field of steel structure under the solar radiation, the temperature field distribution law of the laminated arch structure under the chord dome and the chord dome under the solar radiation is studied, and the structural response law of the lower chord dome at this temperature field is revealed.
【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2011
【分類號】：TU399

【引證文獻】

相關博士學位論文 前2條

1 劉永建;大跨度拱支結構力學性能與施工技術研究[D];天津大學;2012年

2 孫國軍;基于拉索精細化物理特性的弦支結構體系力學性能研究[D];天津大學;2013年

相關碩士學位論文 前2條

1 陳前;基于改進的模擬植物生長算法的弦支穹頂結構優(yōu)化設計研究及其抗震性能分析[D];華南理工大學;2013年

2 安琦;單向及雙向弦支（張弦）結構性能分析[D];天津大學;2012年

，

本文編號：1951221