自锚式悬索桥主缆锚固区空间应力分析  

Analysis of Spatial Stress in Main Cable Anchorage Zone of the Self-Anchored Bridge

作　　者：包龙生[1] 朱春莹[1] 于玲[1] 王娟[1] 

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2014年第4期636-643,共8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(2012-K2-31);高校优秀科技人才支持计划(LR2013025);辽宁省"百千万人才工程"人选项目择优资助(2012921047)

摘　　要：目的对典型的锚固区局部节段进行分析,以解决自锚式悬索桥主缆锚固区结构复杂,平面杆系程序无法把握锚固区复杂受力状态的问题,为桥梁设计和施工提供参考依据.方法运用MIDAS/FEA建立浑河景观桥锚固区局部有限元模型,分析最不利索力设计值下的局部应力状态及不同荷载下的极限承载力.结果锚固区在主缆索力T=50 000 kN作用下,产生的最大位移为4.91 mm;锚垫板的索孔周围的von Mises应力在110 MPa左右.随着荷载的增加,锚固区von Mises应力不断增大.当索力为设计荷载的3.5倍时,锚固区各板件的应力均达到了468 MPa以上,位移最大值为24 mm.结论主缆锚固区各构件的刚度和强度均满足要求,锚固区的极限承载力为设计荷载的3.5倍,结构的安全系数较高.In order to solve complex stress state problem in the anchorage zone of self-anchored bridge which could not be grasped with the conventional plane linkage program and to provide a basis for construction and design of bridges, a finite element model of Hunhe landscape bridge was built using MIDAS/FEA and the local stress state was analyzed by the most unfavorable cable loading and the ultimate bearing capacity under different loads subjected in the anchorage zones was calculated. Results show that the maximum displacement of anchorage zone is 4. 92 mm under main cable force T = 50 000 kN and von Mises stress around the cable hole of anchor plate is about 110 MPa. With the load increasing, the Von Mises stress of anchorage zone increases constantly. If the load is increased to 3.58 times of the design value, the stresses of all parts in the anchorage zone are higher than 468 MPa and the maximum displacement is 24 mm. It indicates that the stiffness and strength of all parts in the main cable anchorage zone meet the requirements. It is also observed that the ultimate bearing capacity of anchorage zone is 3.5 times of the design load value, and the safety factor of structure is relatively high.

关 键 词：自锚式悬索桥 主缆锚固区 应力分析 极限承载力 

分 类 号：TU3[建筑科学—结构工程] U441.5[建筑科学—桥梁与隧道工程]