特重車交通荷載作用下大跨拱橋動力響應分析

武雋+楊飛+院素靜+韓萬水

建筑科學與工程學報2014年文章編號：16732049(2014)01006808

收稿日期：20140113

基金項目：國家自然科學基金項目（51278064）

作者簡介：武雋（1982），女，陜西西安人，講師，工學博士

摘要：為研究特重車交通荷載工況作用下大跨拱橋的動力響應特點，以河北省宣大高速公路上某大橋的動態稱重系統所采集的近3年的交通數據為基礎，定義并提取了特重車的交通荷載工況，進而分析了不同類型特重車交通荷載工況所占比例及每個特重車交通荷載工況車輛總質量的分布規律。利用隨機車流橋梁耦合振動分析軟件計算了大跨拱橋在特重車交通荷載作用下的空間動力響應，并與新舊橋梁規范中的設計車輛荷載對應的響應進行了對比。結果表明：新規范對拱橋關鍵部位的設計荷載定義更為保守，實測的交通荷載工況中僅有極少數特重車交通荷載工況對應的響應超過了設計車輛荷載對應的響應；對于該大跨拱橋，新橋梁規范中的設計車輛荷載能夠較充分地考慮大部分特重車交通荷載作用對橋梁結構整體受力產生的不利影響。

關鍵詞：橋梁工程；特重車交通荷載；隨機車流橋梁系統；大跨拱橋；動力響應；動態稱重

中圖分類號：U441.2文獻標志碼：A

Dynamic Response Analysis of Longspan Arch Bridge Under

Extraheavy Truck LoadWU Jun, YANG Fei, YUAN Sujing, HAN Wanshui

（School of Highway, Changan University, Xian 710064, Shaanxi, China）Abstract: Authors investigated the characteristics of the spatial dynamic response of an longspan arch bridge using the random trafficbridge coupling vibration analysis software based on realistic extraheavy truck load data recorded by the weighinmotion (WIM) system. A set of WIM system was installed on a bridge located in the highway from Xuanhua to Datong, Hebei Province. The extraheavy truck load cases were defined and extracted using traffic load data in last three years acquainted by the system, then the proportions of different types and the vehicle weight distributions of the extraheavy truck cases were analyzed, and the structure response was compared with that under the design specification load. The spatial dynamic response of longspan arch bridge under the extraheavy truck cases was analyzed using the random trafficbridge coupling vibration analysis software, and the structure response was compared with that under the design vehicle load in old and current bridge codes. The results show that only few extraheavy truck cases result in larger response than those under design specification vehicle load, implying that the designed load specified in the code can take into account of most critical traffic cases for the studied longspan arch bridge.

Key words: bridge engineering; extraheavy truck load; random trafficbridge system; longspan arch bridge; dynamic response; weighinmotion

0引言

由于車輛計重收費及橋梁健康監測等方面的需求，動態稱重(WeighinMotion，WIM)系統在中國高速公路收費站及大橋的健康監測系統中得到了廣泛應用，該系統可以記錄車輛的通過時間、車輛類型、軸重、軸距、車輛總質量等信息?！?br>