【摘要】：橋梁結(jié)構(gòu)分階段施工方法及其分階段施工技術(shù)的發(fā)展已成為土木工程界最引人注目的成就之一,盡管分階段施工方法在許多方面都具有明顯的優(yōu)勢(shì),但該方法所得到最終成橋狀態(tài)的內(nèi)力和線形與一次整體施工法相比,存在很大差異,為了解決分階段施工橋梁的結(jié)構(gòu)分析問題,橋梁學(xué)者提出了分階段成形結(jié)構(gòu)分析理論,本文以分階段成形結(jié)構(gòu)的分析理論為核心,主要研究了五個(gè)部分的內(nèi)容：第一部分回顧了分階段施工橋梁的發(fā)展歷程,闡述了分階段施工工藝及分類、分階段施工橋梁的結(jié)構(gòu)分析方法和分階段施工橋梁中間狀態(tài)的確定方法。詳細(xì)介紹了分階段成形結(jié)構(gòu)分析理論的基本平衡方程,該理論方程表明結(jié)構(gòu)最終狀態(tài)的內(nèi)力和線形由荷載、結(jié)構(gòu)體系和構(gòu)件單元的無應(yīng)力狀態(tài)量三個(gè)條件唯一確定,該理論在創(chuàng)立之初主要應(yīng)用于索結(jié)構(gòu)橋梁,即無應(yīng)力狀態(tài)法。第二部分介紹了橋梁成橋線形的組成,根據(jù)分階段施工橋梁的分析理論,在以構(gòu)件單元的無應(yīng)力狀態(tài)量進(jìn)行橋梁的線形控制時(shí),由于成橋線形表現(xiàn)為一系列離散的高程點(diǎn),本文選取三次樣條插值的方法來求取節(jié)段的無應(yīng)力曲率,詳細(xì)介紹了具體的推導(dǎo)過程,并用具體算例證明所得結(jié)果的準(zhǔn)確性。第三部分將成橋線形的節(jié)點(diǎn)高程值引入分階段成形結(jié)構(gòu)分析理論的基本平衡方程,得到了主梁的線形控制方程。取無應(yīng)狀態(tài)量作為橋梁線形的控制參量,對(duì)于預(yù)制梁段,推導(dǎo)了節(jié)段在預(yù)制時(shí)所需要的各個(gè)參數(shù),并基于這些參量給出了節(jié)段形狀輪廓圖和預(yù)制形狀輪廓形狀的數(shù)學(xué)方程式；對(duì)于現(xiàn)澆施工的主梁節(jié)段,采用線形控制方程可直接得到中間施工過程中滿足結(jié)構(gòu)成橋線形的立模標(biāo)高。第四部分介紹了考慮材料時(shí)變效應(yīng)的橋梁線形控制,本文具體討論的是混凝土的收縮徐變,根據(jù)分階段成形結(jié)構(gòu)分析理論,利用數(shù)值模擬的方法或線形控制方程可得到梁段因收縮徐變產(chǎn)生的無應(yīng)力狀態(tài)量變化量的計(jì)算公式,將此改變量作為對(duì)原無應(yīng)力狀態(tài)量的修正,通過最終修正后的無應(yīng)力狀態(tài)量進(jìn)行橋梁的線形控制。第五部分主要考慮了分階段施工過程中的溫度影響,根據(jù)分階段成形結(jié)構(gòu)的分析理論可推導(dǎo)得到主梁節(jié)段兩端高程差的數(shù)學(xué)表達(dá)式,基于該表達(dá)式,提出了一種或幾種合理有效的方法修正施工過程中因溫度變化而產(chǎn)生的響應(yīng),然后結(jié)合具體算例驗(yàn)證這幾種方法所得結(jié)果的準(zhǔn)確性并闡述了優(yōu)缺點(diǎn)。
[Abstract]:The development of the phased construction method and the phased construction technology of bridge structure has become one of the most remarkable achievements in the field of civil engineering, although the phased construction method has obvious advantages in many aspects. However, the internal force and linear shape of the final completed bridge obtained by this method are quite different from that of the one-stage integral construction method. In order to solve the structural analysis problem of the bridge constructed by stages, bridge scholars put forward the theory of structured analysis of phased forming structure. In this paper, based on the analysis theory of the phased forming structure, the contents of five parts are mainly studied: the first part reviews the development course of the phased construction bridge, and expounds the construction technology and classification of the phased construction. The method of structure analysis and the method of determining the intermediate state of the bridge are presented in this paper. In this paper, the basic equilibrium equation of the theory of stage-forming structure analysis is introduced in detail. The theoretical equation shows that the internal force and the linear shape of the final state of the structure are determined only by three conditions: the load, the unstressed state quantity of the structural system and the member element. This theory was mainly used in cable-structure bridges at the beginning of its establishment, that is, the stress-free state method. In the second part, the composition of the bridge alignment is introduced. According to the analysis theory of the bridge construction by stages, when the structure is controlled by the unstressed state of the component element, the linear shape of the bridge is displayed as a series of discrete elevation points. In this paper, the cubic spline interpolation method is chosen to calculate the stress-free curvature of segments, and the concrete derivation process is introduced in detail, and the accuracy of the obtained results is proved by an example. In the third part, the nodal height of the bridge is introduced into the basic equilibrium equation of the theory of stage-forming structure analysis, and the linear control equation of the main beam is obtained. In this paper, the parameters of prefabricated beam segment are derived by taking the unresponsive state as the control parameter of bridge alignment. Based on these parameters, the section contour diagram and the mathematical equation of prefabricated shape contour are given. For the section of the main beam in cast-in-place construction, the vertical formwork elevation satisfying the linear shape of the bridge in the intermediate construction process can be directly obtained by using the linear control equation. In the fourth part, the linear control of bridge considering the time-varying effect of material is introduced. The concrete shrinkage and creep are discussed in this paper. By using the method of numerical simulation or linear governing equation, the formula for calculating the quantity of unstressed state change caused by shrinkage and creep in beam section can be obtained, which is regarded as a correction to the original unstressed state quantity. The linear control of the bridge is carried out by the modified state of stress. In the fifth part, the influence of temperature on the stage construction is considered, and the mathematical expression of the height difference between the two ends of the main beam segment can be derived according to the analysis theory of the phased forming structure, and based on this expression, In this paper, a reasonable and effective method is proposed to correct the response caused by the change of temperature in the construction process, and then the accuracy of the results obtained by these methods is verified with a concrete example and the advantages and disadvantages are expounded.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445.4

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