摘要
目的对大跨径连续刚构桥合拢施工时梁底崩裂进行风险分析,以便制定相应的风险应对措施确保施工安全.方法结合北山大桥工程实例,采用有限元分析软件ANSYS对大跨径连续刚构桥进行合拢施工时空间结构的位移、应力分析,得到由钢束引起的下崩力产生梁底崩裂原因.结果北山大桥合拢时针对由钢束引起的下崩力产生梁底崩裂事态,分析得到主梁横向位移最大值为0.43 mm;最大压应力为3.88 MPa,合拢施工时的位移和应力偏差很大.结论大跨径连续刚构桥合拢过程中,钢束引起的下崩力会对结构的安全带来风险,施工时需要有相应的预防措施.
The beam bottom crack risk analysis of long-span continuous rigid frame bridge closure construction is conducted to formulate the corresponding risk counter measures to ensure construction safety. Combined with the northern bridge as an example, using finite element analysis software ANSYS on long-span continuous rigid frame bridge construction for closed space structure displacement, stress analysis, be made of steel beam caused by collapsing force generating beam crack reason. The northern bridge closed directed at steel beam caused by collapsing force generating beam bottom crack situation, analysis of main girder trans-. verse displacement maximum value for the 0. 43 mm;the maximum compressive stress for 3.88 MPa. Get closed during the construction of the displacement and stress of large deviation results. During long-span continuous rigid frame bridge closure process, steel beam caused by the collapse of structures under force security risks, construction requires the corresponding prevention measures.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2012年第1期94-99,共6页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(51078242)
住房和城乡建设部科学技术项目(2010-K3-38)
关键词
大跨径连续刚构桥
合拢
施工
梁底崩裂
long-span continuous rigid frame bridge
closure
construction
bottom of beam crack
