箱梁桥横向拓宽后的基础沉降附加内力分析  

Study of additional forces induced by differential settlement of widened box girder bridges

作　　者：温庆杰[1] 朱玉晓[1] 王东权[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院深部岩土力学与地下工程国家重点实验室,江苏徐州221116

出　　处：《中国矿业大学学报》2011年第3期351-356,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50874105);中国矿业大学校青年基金项目(2009A010)

摘　　要：新、旧箱梁横向拼接后会发生支座相对沉降差,从而在上部结构中产生附加内力.为分析支座差异沉降对上部结构受力的影响,建立了新、旧箱梁横向拼接后的简化力学计算模型,采用纽玛克数值法分析了支座差异沉降产生的附加内力,同时对影响附加内力的主要因素进行了参数分析.研究结果表明,由纽玛克数值法计算的新、旧箱梁桥基础沉降附加内力可以估算基础差沉降容许值,根据算例分析结果,将基础沉降差容许值控制在10 mm内可以保证新、旧箱梁桥的整体工作性能.Added internal forces appear in the upper structure of a widened bridge due to differential settlement of bridge bearings associated with new and old box girders.A simplified mechanical model is proposed to analyze the influence of differential settlement in this situation.The Newmark numerical method is used to predict additional internal forces from the differential settlement.A parametric analysis of the main factors using the Newmark method is also presented.The method may be used to estimate a permissible differential settlement,that is based upon these additional internal forces in the upper structure.An example is presented that shows a differential settlement less than 10 millimeters will guarantee the integral performance of new and old box girders in a bridge.

关 键 词：桥梁拓宽 混凝土箱梁 基础差异沉降 附加内力 

分 类 号：U448.2[建筑科学—桥梁与隧道工程]