摘要
针对利用浅梁理论进行独柱式桥墩帽梁设计产生较大偏差的情况,提出基于深梁力流线模型理论的应力扰动区(D区)设计方法,并将其应用于独柱式桥墩帽梁的分析和设计中。该方法用力流线表征D区内部的主要传力路径,根据边界条件确定力流线的数学物理方程,据此推导力流线沿程横向拉力的解析计算式。对3种独柱式桥墩帽梁(矩形、倒梯形和花瓶形)进行有限元分析,验证所提出横向拉力计算式的正确性,并以某布置有双支座的花瓶形墩帽为例,说明力流线模型设计方法的应用流程。结果表明,依据力流线模型所提出的横向拉力计算公式具有形式简洁、计算精度高、物理意义明确的特点,可方便可靠地用于独柱式桥墩帽梁的设计。
In view of the considerable deviations arising in the design of the capping beam of single column pier according to the shallow beam theory,a design method of stress disturbance region （D-region） based on the load path model theory of deep beams was developed and was applied to the analysis and design of the capping beam.In the method,the force flow was used to express the principal load paths in the D-region.In conformity to the boundary conditions,the equations of mathematical physics for the load paths were determined and in turn an analytical calculation formula for the on-way transverse tension of the load paths was accordingly derived.The finite element analysis for the three types of the capping beams （the rectangular,inverted trapezoidal and flared beams） of the single column pier was conducted and the correctness of the derived formula for the transverse tension was verified.By way of example of the capping beam of a flared pier laid out with double bearings,the application process of the design method for the load path model was illustrated.It was concluded that the formula for the transverse tension derived according to the load path model was characteristic of simplicity,high calculation precision and explicit physical significance and could be conveniently and reliably applied to the design of the capping beams of the single column piers.
出处
《桥梁建设》
EI
CSCD
北大核心
2013年第5期106-110,共5页
Bridge Construction
基金
国家自然科学基金(51278120)~~
关键词
桥墩
帽梁
应力扰动区
力流线模型
拉压杆模型
设计
有限元法
pier
capping beam
stress disturbance region
load path model
strut-and-tie model
design
finite element method
