獨柱墩梁橋橫向穩(wěn)定計算理論與驗證
發(fā)布時間：2018-07-17 03:06
【摘要】：針對獨柱墩梁橋橫向穩(wěn)定存在的隱患問題,通過對多座獨柱墩梁橋倒塌現(xiàn)場殘骸的調(diào)查研究提出了傾覆過程中的5種可能破壞模式�；诘湫推茐哪Ｊ�,提出以所有抗扭支座失效(脫空)作為判斷傾覆的準則。采用有限度的抗扭支座模擬支座尺寸對抗傾覆的有利影響,將獨柱墩梁橋傾覆過程等效為箱梁變形體轉(zhuǎn)動及剛體轉(zhuǎn)動的疊加,并考慮箱梁大轉(zhuǎn)動導(dǎo)致橋墩反力重分布對于橋梁抗傾覆的影響。在不考慮、考慮支座尺寸(即支座點支撐或面支撐)2種模式下,通過能量法和變分原理建立空間力系平衡來判斷箱梁是否傾覆;最后以上虞春暉橋、哈爾濱三環(huán)路鴻福路段上行匝道橋、粵贛高速匝道橋和津晉高速匝道橋為例,對提出理論進行了驗證,并進一步進行了影響因素分析。研究結(jié)果表明:相比于規(guī)范計算方法將傾覆簡單地看作剛體的轉(zhuǎn)動,由于綜合考慮了變形體轉(zhuǎn)動、剛體轉(zhuǎn)動及箱梁大轉(zhuǎn)動對橋梁傾覆的影響,提出的計算方法所得4座橋的臨界傾覆荷載與實測傾覆荷載接近,可偏安全的計算梁橋的抗傾覆承載力。
[Abstract]:In view of the hidden danger of lateral stability of single column pier girder bridge, five possible failure modes in the process of capsizing are put forward through investigation and research on the site wreckage of several single column pier girder bridges. Based on the typical failure mode, all anti-torsion bearing failure (void removal) is proposed as the criterion to judge overturn. A limited torsional bearing is used to simulate the beneficial effect of bearing size on overturning, and the overturning process of single column pier girder bridge is equivalent to the superposition of box girder deformation body rotation and rigid body rotation. The influence of the redistribution of the reaction force on the overturning of the bridge caused by the large rotation of the box girder is considered. Under two modes of bearing size (i.e. support at support point or surface support), the balance of spatial force system is established by energy method and variational principle to determine whether the box girder is overturned or not, and finally the Shangyu Chunhui Bridge is used to determine whether the box girder is overturned or not. The proposed theory is verified and the influencing factors are analyzed by the following examples: Hongfu uplink ramp bridge Guangdong and Jiangxi expressway ramp bridge and Jinjin high speed ramp bridge in the third Ring Road of Harbin. The results show that, compared with the standard calculation method, the overturn is simply regarded as the rotation of the rigid body, and the effects of the rotation of the deformable body, the rotation of the rigid body and the large rotation of the box girder on the capsizing of the bridge are considered synthetically. The critical overturning load of the four bridges obtained by the proposed method is close to the measured overturning load, and the anti-capsizing capacity of the beam bridge can be calculated safely.
【作者單位】： 清華大學(xué)水利水電工程系;交通運輸部公路科學(xué)研究院;浙江工業(yè)大學(xué)建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51778586) 浙江省自然科學(xué)基金項目(LY13E080014)
【分類號】：U441
本文編號：2128735
[Abstract]:In view of the hidden danger of lateral stability of single column pier girder bridge, five possible failure modes in the process of capsizing are put forward through investigation and research on the site wreckage of several single column pier girder bridges. Based on the typical failure mode, all anti-torsion bearing failure (void removal) is proposed as the criterion to judge overturn. A limited torsional bearing is used to simulate the beneficial effect of bearing size on overturning, and the overturning process of single column pier girder bridge is equivalent to the superposition of box girder deformation body rotation and rigid body rotation. The influence of the redistribution of the reaction force on the overturning of the bridge caused by the large rotation of the box girder is considered. Under two modes of bearing size (i.e. support at support point or surface support), the balance of spatial force system is established by energy method and variational principle to determine whether the box girder is overturned or not, and finally the Shangyu Chunhui Bridge is used to determine whether the box girder is overturned or not. The proposed theory is verified and the influencing factors are analyzed by the following examples: Hongfu uplink ramp bridge Guangdong and Jiangxi expressway ramp bridge and Jinjin high speed ramp bridge in the third Ring Road of Harbin. The results show that, compared with the standard calculation method, the overturn is simply regarded as the rotation of the rigid body, and the effects of the rotation of the deformable body, the rotation of the rigid body and the large rotation of the box girder on the capsizing of the bridge are considered synthetically. The critical overturning load of the four bridges obtained by the proposed method is close to the measured overturning load, and the anti-capsizing capacity of the beam bridge can be calculated safely.
【作者單位】： 清華大學(xué)水利水電工程系;交通運輸部公路科學(xué)研究院;浙江工業(yè)大學(xué)建筑工程學(xué)院;
【基金】：國家自然科學(xué)基金項目(51778586) 浙江省自然科學(xué)基金項目(LY13E080014)
【分類號】：U441
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