高強次輕混凝土對鋼管混凝土拱橋力學性能影響的研究
發(fā)布時間：2019-07-01 15:46
【摘要】：高強次輕混凝土是指在輕集料中摻入適量的普通集料配置而成的一種密度和彈性模量可變的混凝土。高強次輕混凝土既有高強普通集料混凝土強度高、剛度大、承載能力強的優(yōu)點,而且也解決了易開裂和延性低的問題。鋼管混凝土作為一種新型復合材料,屬于鋼和混凝土的組合結構,這種復合結構能夠充分利用鋼管和混凝土這兩種材料各自的優(yōu)勢,所以鋼管混凝土結構在軸向力作用下的承載能力遠遠大于兩者單獨受荷的承載力之和。本論文結合橋梁自身的結構和材料特性與實際承受荷載的情況,運用空間有限元分析理論來建立模型,結合高強次輕混凝土輕質(zhì)、高強、優(yōu)良的體積、穩(wěn)定性和耐久性等特點,比較不同混凝土灌注方案,分析橋梁結構的應力、穩(wěn)定性和自振等的變化特征,然后證明高強次輕混凝土對鋼管混凝土拱橋力學性能的影響。本文主要開展的工作包括以下幾點:(1)結合高強次輕混凝土現(xiàn)階段國內(nèi)外的研究現(xiàn)狀,橫向比較了它與高強普通集料混凝土和高強輕集料混凝土之間的區(qū)別,并總結了它們的工程應用情況與研究成果。論文還介紹了鋼管混凝土拱橋的基本結構特點與發(fā)展現(xiàn)狀,提出了將高強次輕混凝土用于鋼管混凝土拱橋的建設中能夠影響其力學性能的觀點。(2)基于空間結構有限元分析法,以合江長江一橋為背景,建立大跨度鋼管混凝土拱橋的空間有限元模型。并對該橋采用線彈性靜力分析法,得到成橋階段和施工階段拱圈各位置處的應力變化。研究表明:高強次輕混凝土能夠改善鋼管混凝土拱橋中鋼管構件和內(nèi)填混凝土的受力,使他們所受的應力減小。(3)根據(jù)大跨度鋼管混凝土的特點,結合拱橋穩(wěn)定問題的基本理論和第一類失穩(wěn)現(xiàn)象的特征,給出并比較了三種不同的混凝土灌注方案在成橋階段前4階失穩(wěn)狀態(tài)的穩(wěn)定系數(shù)和失穩(wěn)模態(tài)特征。由分析可得出結論:高強次輕混凝土能夠提高大跨度鋼管混凝土的穩(wěn)定性。(4)本論文進行了成橋階段的自振特性分析,得到了它們在前三階的振型周期和名稱。結果表明:采用不同灌注方案得到的自振頻率相差較小,所以混凝土的密度和彈性模量的改變對結構自振頻率影響不大。
[Abstract]:The high-strength secondary light concrete refers to a concrete with variable density and elastic modulus, which is formed by adding a proper amount of common aggregate into the light aggregate. The high-strength secondary light concrete has the advantages of high strength, large rigidity and strong bearing capacity, and also solves the problems of easy cracking and low ductility. The steel pipe concrete, as a novel composite material, belongs to the composite structure of steel and concrete, and the composite structure can fully utilize the advantages of the two materials of the steel pipe and the concrete, So that the bearing capacity of the steel tube concrete structure under the action of axial force is far greater than the sum of the bearing capacity of the two independent loads. Based on the structure and material characteristics of the bridge and the actual bearing load, the space finite element analysis theory is used to establish the model, and the concrete pouring scheme is compared with the characteristics of light weight, high strength, excellent volume, stability and durability of the high-strength secondary light concrete. The stress, stability and self-vibration of the bridge structure are analyzed, and the effect of the high strength secondary light concrete on the mechanical properties of the steel tube concrete arch bridge is proved. The main work of this paper is as follows: (1) The research status of high-strength and light-light concrete at present and abroad is studied, and the difference between it and high-strength ordinary aggregate concrete and high-strength light-aggregate concrete is compared, and their engineering application and research results are summarized. The basic structure and development status of the CFST arch bridge are also introduced, and the view that the high strength secondary light concrete is used in the construction of the steel pipe concrete arch bridge can influence the mechanical properties of the steel pipe concrete arch bridge. (2) Based on the finite element method of the spatial structure, the space finite element model of the long-span steel tube concrete arch bridge is set up by using the bridge of the Yangtze River as the background. And the stress change at each position of the arch ring in the bridge stage and the construction stage is obtained through the linear elastic static analysis method of the bridge. The results show that the high-strength and light-light concrete can improve the stress of the steel pipe component and the inner-filled concrete in the steel tube concrete arch bridge, so that the stress on the steel pipe concrete arch bridge can be reduced. (3) According to the characteristics of large-span steel tube concrete, combined with the basic theory of the stability problem of the arch bridge and the characteristics of the first kind of instability phenomenon, the stability coefficient and the instability mode character of the three different concrete pouring schemes in the four-order unstable state of the bridge stage are given and compared. It can be concluded from the analysis that the high-strength secondary light concrete can improve the stability of the large-span steel tube concrete. (4) The self-vibration characteristic of the bridge stage is analyzed, and the mode and name of the first three-order modes are obtained. The results show that the variation of the density and the elastic modulus of the concrete has little influence on the natural frequency of the structure.
【學位授予單位】：西華大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U448.22;U441
本文編號：2508611
[Abstract]:The high-strength secondary light concrete refers to a concrete with variable density and elastic modulus, which is formed by adding a proper amount of common aggregate into the light aggregate. The high-strength secondary light concrete has the advantages of high strength, large rigidity and strong bearing capacity, and also solves the problems of easy cracking and low ductility. The steel pipe concrete, as a novel composite material, belongs to the composite structure of steel and concrete, and the composite structure can fully utilize the advantages of the two materials of the steel pipe and the concrete, So that the bearing capacity of the steel tube concrete structure under the action of axial force is far greater than the sum of the bearing capacity of the two independent loads. Based on the structure and material characteristics of the bridge and the actual bearing load, the space finite element analysis theory is used to establish the model, and the concrete pouring scheme is compared with the characteristics of light weight, high strength, excellent volume, stability and durability of the high-strength secondary light concrete. The stress, stability and self-vibration of the bridge structure are analyzed, and the effect of the high strength secondary light concrete on the mechanical properties of the steel tube concrete arch bridge is proved. The main work of this paper is as follows: (1) The research status of high-strength and light-light concrete at present and abroad is studied, and the difference between it and high-strength ordinary aggregate concrete and high-strength light-aggregate concrete is compared, and their engineering application and research results are summarized. The basic structure and development status of the CFST arch bridge are also introduced, and the view that the high strength secondary light concrete is used in the construction of the steel pipe concrete arch bridge can influence the mechanical properties of the steel pipe concrete arch bridge. (2) Based on the finite element method of the spatial structure, the space finite element model of the long-span steel tube concrete arch bridge is set up by using the bridge of the Yangtze River as the background. And the stress change at each position of the arch ring in the bridge stage and the construction stage is obtained through the linear elastic static analysis method of the bridge. The results show that the high-strength and light-light concrete can improve the stress of the steel pipe component and the inner-filled concrete in the steel tube concrete arch bridge, so that the stress on the steel pipe concrete arch bridge can be reduced. (3) According to the characteristics of large-span steel tube concrete, combined with the basic theory of the stability problem of the arch bridge and the characteristics of the first kind of instability phenomenon, the stability coefficient and the instability mode character of the three different concrete pouring schemes in the four-order unstable state of the bridge stage are given and compared. It can be concluded from the analysis that the high-strength secondary light concrete can improve the stability of the large-span steel tube concrete. (4) The self-vibration characteristic of the bridge stage is analyzed, and the mode and name of the first three-order modes are obtained. The results show that the variation of the density and the elastic modulus of the concrete has little influence on the natural frequency of the structure.
【學位授予單位】：西華大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U448.22;U441
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