中小跨徑梁橋減隔震性能研究
發(fā)布時間：2018-10-24 06:18
【摘要】：在中國橋梁建設(shè)中,中小跨徑橋梁是一種常用橋梁結(jié)構(gòu)形式。目前,針對此類橋型的減隔震研究尚不完善。此類橋型的減隔震設(shè)計仍然沒有明確的理論規(guī)范作為指導,若按傳統(tǒng)的設(shè)計方法,必然會有一定的安全隱患。橋梁的減隔震設(shè)計在未來的橋梁設(shè)計中必然會有越來越重要的地位,本文主要針對此類橋型的減隔震性能進行分析,主要的研究內(nèi)容如下:(1)闡述了減隔震橋梁的原理、特點,總結(jié)了國內(nèi)外減隔震的發(fā)展現(xiàn)狀以及未來發(fā)展的趨勢。總結(jié)了減隔震設(shè)計方法及有限元建模的原理以及地震分析方法,對不同減隔震支座的模擬進行了說明。(2)通過對減隔震裝置(LRB、阻尼器)進行參數(shù)敏感性分析,得出橋梁減隔震設(shè)計中減隔震裝置參數(shù)的變化對隔震能力的影響。(3)通過對不同結(jié)構(gòu)類型(圓柱墩和矩形墩)、不同減隔震方案(普通板式橡膠支座、阻尼器與普通板式橡膠支座組合使用、LRB、高阻尼橡膠支座、球型橡膠支座)組合的10種方案進行有限元模型計算,對比采用同一地震波作用下的動力特性、主梁位移、橋墩位移、塑性鉸區(qū)域變化、墩底受力等不同。(4)通過對LRB、高阻尼橡膠支座、球型支座三種減隔震裝置分別建立3種不同的墩高結(jié)構(gòu)形式(等墩高、不等墩高對稱、不等墩高不對稱)。對比在同一減隔震裝置下,同一橋梁同一地震力時,墩高的差異對隔震能力的影響。在同一地震力作用下,通過對特征周期、墩梁位移、主墩塑性轉(zhuǎn)角、主墩墩底內(nèi)力等動力反應(yīng)結(jié)果進行對比研究。
[Abstract]:In the construction of bridges in China, middle and small span bridges are commonly used as bridge structures. At present, the research on the isolation of this kind of bridge is not perfect. There is still no clear theoretical criterion to guide the design of this kind of bridge. If the traditional design method is used, there will be some hidden trouble in safety. The seismic isolation design of bridge is bound to play an increasingly important role in the future bridge design. This paper mainly analyzes the seismic isolation performance of this type of bridge. The main research contents are as follows: (1) the principle and characteristics of seismic isolation bridge are expounded. The present situation and future development trend of seismic isolation at home and abroad are summarized. The design method of seismic isolation, the principle of finite element modeling and the method of seismic analysis are summarized. The simulation of different isolation bearings is explained. (2) the parameter sensitivity analysis of the isolation device (LRB, damper) is carried out. The influence of the parameters of the isolation device on the isolation ability is obtained. (3) through the different structural types (cylindrical pier and rectangular pier), different isolation schemes (ordinary plate rubber bearing), The finite element model of 10 kinds of schemes combined with dampers and ordinary plate rubber bearings, LRB, high damping rubber bearings and spherical rubber supports) were calculated. The dynamic characteristics of the same seismic wave, the displacement of the main beam, the displacement of the bridge pier, and the displacement of the bridge pier were compared with each other. The variation of plastic hinge region and the stress on the bottom of the pier are different. (4) three different types of pier height structure (equal pier height, unequal pier height symmetry, unequal pier height asymmetry) are established by using three kinds of isolation devices with LRB, high damping rubber bearing and spherical bearing. Under the same isolation device and the same seismic force of the same bridge, the effect of pier height difference on the isolation capacity is compared. Under the action of the same seismic force, the dynamic response results such as characteristic period, displacement of pier beam, plastic turning angle of main pier and internal force at the bottom of main pier are compared and studied.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55
本文編號：2290561
[Abstract]:In the construction of bridges in China, middle and small span bridges are commonly used as bridge structures. At present, the research on the isolation of this kind of bridge is not perfect. There is still no clear theoretical criterion to guide the design of this kind of bridge. If the traditional design method is used, there will be some hidden trouble in safety. The seismic isolation design of bridge is bound to play an increasingly important role in the future bridge design. This paper mainly analyzes the seismic isolation performance of this type of bridge. The main research contents are as follows: (1) the principle and characteristics of seismic isolation bridge are expounded. The present situation and future development trend of seismic isolation at home and abroad are summarized. The design method of seismic isolation, the principle of finite element modeling and the method of seismic analysis are summarized. The simulation of different isolation bearings is explained. (2) the parameter sensitivity analysis of the isolation device (LRB, damper) is carried out. The influence of the parameters of the isolation device on the isolation ability is obtained. (3) through the different structural types (cylindrical pier and rectangular pier), different isolation schemes (ordinary plate rubber bearing), The finite element model of 10 kinds of schemes combined with dampers and ordinary plate rubber bearings, LRB, high damping rubber bearings and spherical rubber supports) were calculated. The dynamic characteristics of the same seismic wave, the displacement of the main beam, the displacement of the bridge pier, and the displacement of the bridge pier were compared with each other. The variation of plastic hinge region and the stress on the bottom of the pier are different. (4) three different types of pier height structure (equal pier height, unequal pier height symmetry, unequal pier height asymmetry) are established by using three kinds of isolation devices with LRB, high damping rubber bearing and spherical bearing. Under the same isolation device and the same seismic force of the same bridge, the effect of pier height difference on the isolation capacity is compared. Under the action of the same seismic force, the dynamic response results such as characteristic period, displacement of pier beam, plastic turning angle of main pier and internal force at the bottom of main pier are compared and studied.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U442.55
【共引文獻】
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，本文編號：2290561
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