桥梁桩柱式基础低应变法检测适宜性分析及现场试验

发布时间：2018-09-18 15:30

【摘要】：根据圣维南原理分析瞬态激振后,桩柱式基础桩身内应力波特征。认为盖梁顶部激振、基桩顶面和墩柱结合部激振时,应力波在桩身内仍可满足平截面假定。提出桩身内应力波是否为平面波的判别方法,设计并完成2组现场试验。盖梁顶部激振时,应力波同步到达同一桩身横截面侧壁各拾振区,且计算得到的横截面中心处首波波峰与侧壁处首波波峰到达时刻基本一致,满足低应变法中平截面成立的条件。而基桩和墩柱结合部激振试验则表明,在远离系梁的拾振横截面内,应力波才可认为同步到达各拾振区,且计算得到的拾振横截面中心处首波波峰与侧壁处首波波峰到达时刻基本一致。故对于基桩和墩柱结合部激振激振的情形,远离系梁的桩身内平截面假定才可成立。
[Abstract]:The characteristics of stress waves in pile body of pile-column foundation are analyzed according to the principle of Saint-Venant. It is considered that the stress wave can still satisfy the assumption of plane section in the pile body when the top of the cap beam is excited and the combination of the top surface of the foundation pile and the pier column is excited. A method for determining whether the stress wave in pile body is a plane wave is proposed and two groups of field tests are designed and completed. When the beam is excited at the top of the cover beam, the stress wave synchronously arrives at each pick up region of the lateral wall of the same pile, and the arrival time of the first wave peak at the center of the cross section is basically the same as the arrival time of the first wave peak at the side wall. It satisfies the condition that the flat cross section is established in the low strain method. On the other hand, the exciting vibration test of the combination of foundation pile and pier column shows that in the cross-section far away from the tie beam, the stress wave can be considered to arrive at each pick up area simultaneously. The arrival time of the first wave peak at the center of the cross section is basically the same as the first wave peak at the lateral wall. Therefore, for the case of the combination of pile and pier, the assumption of the inner plane section of pile body far away from the tie beam can be established.
【作者单位】：交通运输部公路科学研究所;桥梁结构安全技术国家工程实验室;
【基金】：交通运输建设科技项目(2011-318-223-1390);交通运输建设科技项目(2007-318-223-30) 交通运输部行业重点实验室应用基础研究计划项目(2012-319-223-020)
【分类号】：U445.55

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