空间曲线蝶形拱桥顶推施工的多尺度模拟分析  

Study of incremental launching of space-curved butterfly-arch bridge

作　　者：牛辉[1] 汪劲丰[1] 张仪萍[1] 张治成[1] 俞亚南[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2013年第7期1205-1212,共8页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51108411);浙江省自然科学基金资助项目(Y1110181);重大工程结构安全防护与健康服役科技创新团队资助项目(2010R50034)

摘　　要：采用实体退化单元精确描述构件几何特征,结合多尺度建模的思想建立杭州钱江八桥全桥精细有限元模型进行施工过程仿真分析.施工阶段仅考虑自重荷载,约束条件为多跨连续梁,最大顶推跨径为94m.分析结果表明:最大拉应力约为307.2MPa,最大压应力约为306.7MPa,均位于前导梁箱型截面段与双工字钢截面段的交接处,在施工过程中主桥结构未出现应力过大情形;主、副拱肋应力及变形呈现空间变化特性,截面角点应力的变化规律具有一定的对称性;主、副拱连杆对结构的受力有明显影响;主梁最大应力为-280.4MPa,施工中主梁未出现屈服现象.The construction of Hangzhou 8th Bridge on Qiantang River was simulated by fine finite element model. The degenerated solid element and multi-scale modeling were adopted. The structure was restrain- ed in boundary conditions of multi-span continuous beams. During construction, the largest launching span was 94 m, and self-weight was the only force considered. Simulation results showed that the largest ten- sion stress and compression stress, both occurred at the joint of the front nose and main beam of the south- ern span, were 307.2 MPa and 306.7 MPa, respectively. No overloading had happened. Stresses of main arch and subarch varied spatially and distributed symmetrically. The connecting rods significantly affected the structure stress. The main beam, stayed unyielding, bore a maximum compressive stress with the val- ue of --280. 4 MPa.

关 键 词：蝶形拱桥 顶推施工 实体退化单元 多尺度有限元模型 

分 类 号：TU443.22[建筑科学—岩土工程]