HDR隔震支座梁橋橫向碰撞參數(shù)分析
發(fā)布時間：2018-08-15 16:28
【摘要】：我國中小跨徑的梁橋,較多采用的是普通板式橡膠支座,但板式橡膠支座在地震作用下容易出現(xiàn)滑動或脫空現(xiàn)象,造成梁體很大的側(cè)向位移,此時支座的傳力功能通常會喪失。為了限制梁體的橫向位移,混凝土擋塊被普遍采用,混凝土擋塊設(shè)計的目的是限制梁體的橫向位移,但同時也會增大梁體與擋塊碰撞的概率,并且混凝土擋塊受到的橫向碰撞會通過蓋梁出現(xiàn)一系列傳力作用,造成墩柱更加不利的受力。在我國的公路橋梁抗震規(guī)范中,混凝土擋塊僅作為一種構(gòu)造措施,在與梁體發(fā)生碰撞時,擋塊往往發(fā)生破壞,因此防止橫向落梁的作用就被大大削弱。針對板式支座梁橋橫向碰撞效應(yīng)的震害,本文以一座4跨簡支變連續(xù)小箱梁為工程背景,利用ANSYS有限元計算軟件,通過建立普通板式支座橋梁、HDR隔震支座橋梁,對比考慮碰撞與不考慮碰撞效應(yīng)下結(jié)構(gòu)響應(yīng)的差異,并對HDR隔震支座梁橋橫向碰撞效應(yīng)參數(shù)進行研究,主要對模擬梁體與擋塊之間碰撞效應(yīng)的接觸單元碰撞剛度、接觸單元初始間隙、上下部結(jié)構(gòu)質(zhì)量比、墩高、墩柱彈塑性等參數(shù)進行分析,得出相對于普通板式支座,HDR隔震支座可以很好的減弱梁體碰撞效應(yīng)。通過減小接觸單元碰撞剛度也可以減小橫向碰撞效應(yīng),但會造成墩梁相對位移的增大,對于HDR隔震支座梁橋,增大初始間隙可以減弱橫向碰撞效應(yīng),上下部質(zhì)量比對結(jié)構(gòu)的橫向碰撞效應(yīng)成正相關(guān)的關(guān)系,墩高在一定范圍內(nèi)變化時,對結(jié)構(gòu)橫向碰撞效應(yīng)影響較大,不考慮墩柱彈塑性,會得出下部結(jié)構(gòu)保守的計算結(jié)果。通過在蓋梁與梁體間安裝剪切耗能板,對比HDR隔震支座、板式支座分別配合剪切耗能板時結(jié)構(gòu)的橫向地震響應(yīng),得出HDR支座配合剪切耗能板在不顯著增大下部結(jié)構(gòu)的內(nèi)力情況下,可以很好的控制墩梁相對位移;通過改變剪切耗能板的屈服強度,可以控制梁體與混凝土擋塊碰撞效應(yīng),當剪切耗能板屈服位移為0.02m時,屈服強度的取值建議過渡墩取上部恒載的0.2倍,中墩取上部恒載的0.3倍。
[Abstract]:In the middle and small span beam bridges in our country, the common plate rubber bearings are more often used, but the plate rubber bearings are prone to slip or empty under the earthquake, which results in a large lateral displacement of the beam body. At this time, the force transfer function of the support will usually be lost. In order to limit the transverse displacement of the beam, the concrete block is widely used. The purpose of the concrete block design is to limit the transverse displacement of the beam, but at the same time, it will increase the probability of collision between the beam and the block. And the transverse impact of the concrete block will cause a series of force transfer through the cover beam, resulting in more unfavorable force on the pier column. In the seismic code of highway bridges in our country, concrete block is only a kind of structural measure, when it collides with beam body, the block is often destroyed, so the function of preventing transverse falling beam is greatly weakened. In view of the earthquake damage caused by the transverse collision effect of plate supported girder bridge, this paper takes a 4-span simple support variable continuous small box girder as the engineering background, using ANSYS finite element calculation software, through the establishment of the ordinary plate bearing bridge and HDR-isolation bearing bridge. Considering the difference between the structural response and the impact effect, the transverse impact parameters of the HDR isolation beam bridge are studied. The impact stiffness of the contact element is studied to simulate the impact effect between the beam body and the block. The initial clearance of the contact unit, the mass ratio of the upper and lower parts of the structure, the height of the pier and the elastoplastic properties of the pier are analyzed. It is concluded that the beam collision effect can be well weakened compared with the HDR isolation bearing of the ordinary plate bearing. The transverse impact effect can also be reduced by reducing the impact stiffness of the contact element, but will result in the increase of the relative displacement of the pier beam. For the HDR isolation support beam bridge, the transverse impact effect can be weakened by increasing the initial clearance. The upper and lower mass ratio has a positive correlation with the transverse impact effect of the structure. When the height of the pier changes within a certain range, it has a great influence on the transverse impact effect of the structure, and the calculation results of the substructure can be obtained conservatively without considering the elastoplasticity of the pier column. By installing shear energy dissipation plate between the cover beam and the beam body, the transverse seismic response of the structure is compared when the HDR isolation support and the plate bearing are respectively combined with the shear energy dissipation plate. It is concluded that the relative displacement of pier beam can be well controlled by HDR bearing combined with shear energy dissipation plate, and the collision effect between beam and concrete block can be controlled by changing the yield strength of shear energy dissipation plate. When the yield displacement of shear energy dissipation plate is 0.02m, it is suggested that the transition pier should take 0.2 times of the upper dead load and the middle pier 0.3 times of the upper dead load.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55
本文編號：2184766
[Abstract]:In the middle and small span beam bridges in our country, the common plate rubber bearings are more often used, but the plate rubber bearings are prone to slip or empty under the earthquake, which results in a large lateral displacement of the beam body. At this time, the force transfer function of the support will usually be lost. In order to limit the transverse displacement of the beam, the concrete block is widely used. The purpose of the concrete block design is to limit the transverse displacement of the beam, but at the same time, it will increase the probability of collision between the beam and the block. And the transverse impact of the concrete block will cause a series of force transfer through the cover beam, resulting in more unfavorable force on the pier column. In the seismic code of highway bridges in our country, concrete block is only a kind of structural measure, when it collides with beam body, the block is often destroyed, so the function of preventing transverse falling beam is greatly weakened. In view of the earthquake damage caused by the transverse collision effect of plate supported girder bridge, this paper takes a 4-span simple support variable continuous small box girder as the engineering background, using ANSYS finite element calculation software, through the establishment of the ordinary plate bearing bridge and HDR-isolation bearing bridge. Considering the difference between the structural response and the impact effect, the transverse impact parameters of the HDR isolation beam bridge are studied. The impact stiffness of the contact element is studied to simulate the impact effect between the beam body and the block. The initial clearance of the contact unit, the mass ratio of the upper and lower parts of the structure, the height of the pier and the elastoplastic properties of the pier are analyzed. It is concluded that the beam collision effect can be well weakened compared with the HDR isolation bearing of the ordinary plate bearing. The transverse impact effect can also be reduced by reducing the impact stiffness of the contact element, but will result in the increase of the relative displacement of the pier beam. For the HDR isolation support beam bridge, the transverse impact effect can be weakened by increasing the initial clearance. The upper and lower mass ratio has a positive correlation with the transverse impact effect of the structure. When the height of the pier changes within a certain range, it has a great influence on the transverse impact effect of the structure, and the calculation results of the substructure can be obtained conservatively without considering the elastoplasticity of the pier column. By installing shear energy dissipation plate between the cover beam and the beam body, the transverse seismic response of the structure is compared when the HDR isolation support and the plate bearing are respectively combined with the shear energy dissipation plate. It is concluded that the relative displacement of pier beam can be well controlled by HDR bearing combined with shear energy dissipation plate, and the collision effect between beam and concrete block can be controlled by changing the yield strength of shear energy dissipation plate. When the yield displacement of shear energy dissipation plate is 0.02m, it is suggested that the transition pier should take 0.2 times of the upper dead load and the middle pier 0.3 times of the upper dead load.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55
【參考文獻】
相關(guān)期刊論文 前10條
1 湯虎;李建中;邵長宇;;板式橡膠支座梁橋橫向抗震加固研究[J];地震工程與工程振動;2016年04期
2 王曉偉;葉愛君;沈星;龐于濤;;大跨度橋梁邊墩橫向減震體系的地震易損性分析[J];同濟大學學報(自然科學版);2016年03期
3 湯虎;李建中;邵長宇;;中小跨徑板式橡膠支座梁橋橫向抗震性能[J];中國公路學報;2016年03期
4 李建中;湯虎;管仲國;;中小跨徑板式橡膠支座梁橋新型隔震系統(tǒng)[J];中國公路學報;2015年03期
5 劉笑顯;李建中;陳旭;;X形彈塑性鋼擋塊對簡支梁橋橫向地震反應(yīng)影響[J];振動與沖擊;2015年02期
6 鄧開來;潘鵬;冉田苒;蘇宇坤;薛彥濤;;耗能型橋梁抗震擋塊試驗研究[J];振動與沖擊;2014年22期
7 王克海;惠迎新;吳剛;;新型雙層抗震擋塊抗震性能研究[J];地震工程與工程振動;2014年S1期
8 禚一;李忠獻;王菲;;橋梁地震碰撞的三維撞擊模型及非線性響應(yīng)分析[J];土木工程學報;2014年05期
9 焦馳宇;龍佩恒;李士鑼;候蘇偉;劉陸宇;;地震作用下中小跨度梁橋橫向碰撞參數(shù)影響分析[J];振動與沖擊;2014年08期
10 李忠獻;李楊;李寧;;RC橋墩抗震性能分析模型與驗證[J];地震工程與工程振動;2014年01期
相關(guān)博士學位論文 前2條
1 劉鵬;地震作用下橋梁梁體與橫向擋塊動態(tài)碰撞研究[D];西南交通大學;2011年
2 朱文正;公路橋梁減、抗震防落梁系統(tǒng)研究[D];長安大學;2004年
相關(guān)碩士學位論文 前2條
1 宋中霜;低屈服點鋼剪切板阻尼器耗能性能研究[D];哈爾濱工業(yè)大學;2013年
2 邵妍;橋梁橫向限位裝置抗震性能評價[D];長安大學;2010年
，本文編號：2184766
本文鏈接：http://sikaile.net/kejilunwen/daoluqiaoliang/2184766.html
