等截面波形钢腹板连续箱梁竖向基频的参数研究  

Study on dynamic characteristics parameters of equal section composite box girder with corrugated steel webs

作　　者：冀伟[1] 刘世忠[1] 蔺鹏臻[1] 

机构地区：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070

出　　处：《西安建筑科技大学学报（自然科学版）》2012年第4期468-473,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(50968008);甘肃省道路桥梁与地下工程重点实验室开放基金资(Kfjj-10-01)

摘　　要：制作了波形钢腹板预应力混凝土连续箱梁的室内试验梁模型,对其竖向基频进行了实测,并利用ANSYS有限元分析软件求得其有限元值,试验梁的有限元值与实测值吻合良好,验证了有限元分析方法的精度和可行性.在此基础上,利用ANSYS有限元分析软件研究了等截面波形钢腹板连续箱梁的横隔板、预应力、波纹形状及跨径对其竖向基频的影响程度,分析结果表明,横隔板、预应力和波纹形状对其竖向基频的影响很小,而跨径对其竖向频率的影响较大.同时发现,《公路桥涵设计通用规范》(JTG D60-2004)中连续梁基频的估算公式不适用于波形钢腹板连续箱梁的竖向基频估算,因此本文对估算公式进行了修正,本文的研究成果能为类似波形钢腹板连续箱梁的竖向基频计算提供参考依据.In this paper, a continuous box girder bridge model of corrugated steel webs is analyzed, using the ANSYS finite-element method, to evaluate its vertical fundamental frequency. Experimental test is conducted on the continuous box girder bridge model of corrugated steel webs to verify the finite-element model. There is good correlation between the results from the tested model and the finite-element analysis. The parameters considered herein are the number of the diaphragm, prestressing force, wave pattern of corrugated steel web and the span length. The results show that the span length influences significantly the fundamental frequency of such bridge. The number of the diaphragm, prestressing force, wave pattern of corrugated steel web have little effects on the fundamental frequency of such bridge. The vertical fundamental frequency estimation formula of the continuous bridge in code （JTG D60-2004） is not suitable for the continuous box girder of corrugated steel webs, thus empirical expressions for the fundamental frequency of such bridges were deduced.

关 键 词：组合箱梁 竖向基频 模型试验 波形钢腹板 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]