【摘要】：異形鋼拱橋?qū)儆谳^柔的體系橋梁,結(jié)構(gòu)基頻很難滿足現(xiàn)行規(guī)范3Hz的要求,其結(jié)果有可能會(huì)使人致振動(dòng)響應(yīng)增大,引發(fā)通行舒適度問(wèn)題;實(shí)踐中對(duì)于類似橋梁通過(guò)調(diào)整結(jié)構(gòu)體系或剛度也很難滿足3Hz的基頻要求,即使?jié)M足基頻要求,也有可能使這類橋梁優(yōu)勢(shì)減少或造價(jià)增大許多而不經(jīng)濟(jì)。因此,開(kāi)展異形鋼拱人行橋通行舒適度及其振動(dòng)控制研究,探索類似橋梁是否一定要滿足3Hz的基頻要求,具有一定的現(xiàn)實(shí)意義和工程應(yīng)用價(jià)值。本文選用溫嶺市兩座異形鋼拱人行橋?yàn)檠芯勘尘?首先提出了本文建議的通行舒適度評(píng)價(jià)體系和方法并驗(yàn)證其可行性,然后利用本文建議的通行舒適度評(píng)價(jià)體系和方法對(duì)背景工程進(jìn)行舒適度評(píng)價(jià),最后對(duì)兩座異形鋼拱人行橋進(jìn)行減振設(shè)計(jì)。具體研究工作和結(jié)論如下:1、提出了本文建議的通行舒適度評(píng)價(jià)體系及采用既有大型有限元軟件Midas Civil/2013實(shí)現(xiàn)了復(fù)雜人行橋人致振動(dòng)響應(yīng)的數(shù)值計(jì)算方法;并利用本文建議的通行舒適度評(píng)價(jià)體系和方法對(duì)文獻(xiàn)中的理工一橋和錫鐵山站旅客跨線天橋進(jìn)行了舒適度評(píng)價(jià),得到的舒適度評(píng)價(jià)結(jié)果與文獻(xiàn)研究方法得到的舒適度評(píng)價(jià)結(jié)果一致,驗(yàn)證了本文建議的通行舒適度評(píng)價(jià)體系和方法是切實(shí)可行的,可以為同類型的橋梁設(shè)計(jì)計(jì)算及概念設(shè)計(jì)提供參考;2、運(yùn)用有限元軟件Midas Civil2013、SAP2000 V15和ANSYS對(duì)溫嶺市兩座異形鋼拱人行橋進(jìn)行動(dòng)力特性分析與比較,并運(yùn)用本文建議的人行橋通行舒適度評(píng)價(jià)體系和方法對(duì)兩座異形鋼拱人行橋進(jìn)行通行舒適度評(píng)價(jià),結(jié)果表明:(1)即使結(jié)構(gòu)基頻小于規(guī)范規(guī)定的3Hz的要求,但在正常人行情況下通行舒適度也能滿足要求;(2)雖然錦屏公園步行橋的二階自振頻率2f?3.6895Hz已經(jīng)大于規(guī)范規(guī)定的3Hz的要求,但在密集人群作用下也有可能發(fā)生人致振動(dòng)舒適性的問(wèn)題,說(shuō)明中國(guó)人行天橋規(guī)范規(guī)定的安全自振頻率限值值得商榷;3、系統(tǒng)總結(jié)了帶減振系統(tǒng)的人行橋結(jié)構(gòu)動(dòng)力特性,重點(diǎn)對(duì)調(diào)諧質(zhì)量阻尼器(TMD)的減振原理、設(shè)計(jì)應(yīng)用方法進(jìn)行了分析,并對(duì)TMD設(shè)計(jì)參數(shù)進(jìn)行了優(yōu)化;4、利用調(diào)諧質(zhì)量阻尼器對(duì)兩座異形鋼拱人行橋進(jìn)行減振設(shè)計(jì),通過(guò)對(duì)比設(shè)置TMD減振裝置前后人行橋的人致振動(dòng)加速度大小,得到翁岙河橋人行橋部分的最大減振率為96.8%,錦屏公園步行橋的減振率可達(dá)55.6%,說(shuō)明設(shè)置TMD減振裝置后減振效果明顯。
[Abstract]:Special-shaped steel arch bridge belongs to a flexible system bridge, the fundamental frequency of the structure is difficult to meet the requirements of the current code 3Hz, the result may cause the increase of human-induced vibration response and cause the problem of traffic comfort. In practice, it is difficult for similar bridges to meet the fundamental frequency requirements of 3Hz by adjusting the structure system or stiffness. Even if the fundamental frequency requirements are satisfied, it is possible to reduce the advantages or increase the cost of such bridges without economy. Therefore, it is of practical significance and engineering application value to study the traffic comfort and vibration control of the steel-arch footbridge with special-shaped steel arch, and to explore whether the similar bridges must meet the fundamental frequency requirements of 3Hz. In this paper, two special-shaped steel arch footbridges in Wenling City are selected as the research background. First of all, the evaluation system and method of the traffic comfort degree proposed in this paper are put forward and its feasibility is verified. Then the comfort evaluation system and method proposed in this paper are used to evaluate the comfort degree of the background engineering. Finally, the vibration absorption design of two special-shaped steel arch footbridges is carried out. The concrete research work and conclusion are as follows: 1. The proposed evaluation system of traffic comfort and the numerical calculation method of the man-made vibration response of complex footbridge are realized by using the existing large finite element software Midas Civil/2013. And using the evaluation system and method of the traffic comfort degree suggested in this paper, the comfort degree of the passenger cross-line flyover of the Polytechnic first Bridge and the Xitieshan Station in the literature has been evaluated. The result of comfort evaluation is consistent with that of literature research, which verifies that the evaluation system and method proposed in this paper are feasible. This paper provides a reference for the design calculation and conceptual design of the same type of bridges. The dynamic characteristics of two special-shaped steel arch footbridges in Wenling City are analyzed and compared by using the finite element software Midas Civil2013,SAP2000 V15 and ANSYS. The results show that: (1) even though the fundamental frequency of the structure is less than the requirement of 3Hz as specified in the code, the evaluation system and method of pedestrian comfort degree of pedestrian bridge proposed in this paper are used to evaluate the traffic comfort degree of two special-shaped steel arch footbridges, and the results show that: (1) even though the fundamental frequency of the structure is less than the requirement of 3Hz, But under normal pedestrian conditions, the traffic comfort can also meet the requirements; (2) although the second order natural vibration frequency of the Jinping Park pedestrian bridge 2f? 3.6895Hz has already exceeded the requirements of the 3Hz specified in the specification, but the problem of human vibration comfort may also occur under the action of a dense crowd. This paper explains that the limit value of safe natural vibration frequency stipulated by Chinese footbridge code is worth discussing 3, systematically summarizes the dynamic characteristics of footbridge structure with damping system, and emphatically analyzes the vibration absorption principle of tuned mass damper (TMD) and the design and application method. The design parameters of TMD are optimized and tuned mass dampers are used to design two special-shaped steel arch footbridges. The acceleration caused by human vibration is compared before and after the installation of TMD damping devices. The results show that the maximum damping rate of the pedestrian bridge of Weng'ao River Bridge is 96.8, and that of the walking bridge in Jinping Park can reach 55.6, which shows that the effect of vibration reduction is obvious after the installation of TMD damping device.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442

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本文編號(hào)：2260579