斜拉桥新型索梁锚固方式及其静力分析  

Innovative form and static analysis of cable-girder anchorage in cable-stayed bridges

作　　者：张崇厚[1] 王红范[1] 高晓磊[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2010年第11期1864-1869,共6页Journal of Tsinghua University(Science and Technology)

基　　金：浙江省科技计划项目(2007C31048)

摘　　要：为了改进传统斜拉桥主梁的受力性能,提出具有张弦梁特征的新型索梁锚固形式。推导分析了新型索梁锚固的传力机理,采用有限元软件ANSYS计算了系列单索模型。腹杆布置、张弦垂跨比对主梁的受力影响较大;最长腹杆宜靠近拉索转向点、张弦垂跨比在条件允许时宜取较大值。对于远、近端锚固形式,随着斜拉索角度的增加,拉索转向点处索梁作用力分别增大和减小、而且此作用力总是远端形式小于近端形式。该文的索梁锚固新形式保持了传统斜拉桥拉索对主梁的竖向弹性支撑作用,可降低拉索锚固力,而且主梁的受力状况由于腹杆的显著支撑作用而改善。This paper presents an innovative form of cable-girder anchorage,with the feature of beam string structure,to improve the mechanical behavior of the main girder in traditional cable-stayed bridges.Mechanism of force transfer in this form was analyzed through theoretical derivation,with a series of single-cable models calculated using ANSYS.The longest web member close to the cable turn point and the larger string sag ratio were proposed since the effects of the longest web member location and the string sag ratio are considerable.As the cable angle increases,interaction force between the cable and girder at the cable turn point increases for forward anchorages but decreases for backward ones.This interaction force is always smaller in forward anchorages than in backward ones.Besides vertical support of the cable to the girder similar to traditional cable-stayed bridges,the innovative anchorage form is proved to efficiently reduce the cable anchorage force and ameliorate the loading state of the girder due to the notable support from web members.

关 键 词：斜拉桥 索梁锚固 连续索 张弦主梁 

分 类 号：U448[建筑科学—桥梁与隧道工程]