山东大学学报(工学版)
山東大學學報(工學版)
산동대학학보(공학판)
JOURNAL OF SHANDONG UNIVERSITY(ENGINEERING SCIENCE)
2013年
6期
77-82,94
,共7页
周新波%徐向锋%张峰%孙家龙%齐广志
週新波%徐嚮鋒%張峰%孫傢龍%齊廣誌
주신파%서향봉%장봉%손가룡%제엄지
箱梁%精轧螺纹钢筋%竖向预应力%平面弹性支承模型%模型试验%非线性%无损检测%锚垫板
箱樑%精軋螺紋鋼觔%豎嚮預應力%平麵彈性支承模型%模型試驗%非線性%無損檢測%錨墊闆
상량%정알라문강근%수향예응력%평면탄성지승모형%모형시험%비선성%무손검측%묘점판
box girder%fine rolled twisted bar%vertical prestressing%plane elastic supporting model%model test%non-linear%non-destructive test%anchor plate
为有效检测竖向预应力筋的有效张拉力并提高竖向预应力的施工质量,解决箱梁由于竖向预应力损失过大而导致箱梁腹板开裂的工程难题,基于结构动力学理论,视竖向预应力精轧螺纹钢筋外露段为悬臂梁,将锚固段用一个刚臂和两个弹性支承模拟,建立竖向预应力筋的平面弹性支承模型。结合模型试验数据,建立精轧螺纹钢筋张拉力P与平面弹性支承刚度K的非线性关系模型。通过室内模型试验及锚固段刚度增大系数法验证本研究方法的有效性,并进行工程应用。引入竖向预应力张拉力无损检测方法进行箱梁竖向预应力张拉施工质量的监测,张拉力合格率由58.0%提高至96.8%,有效提高了竖向预应力的施工质量。同时提出了箱梁施工期需要提高锚垫板安装精度的工程措施。
為有效檢測豎嚮預應力觔的有效張拉力併提高豎嚮預應力的施工質量,解決箱樑由于豎嚮預應力損失過大而導緻箱樑腹闆開裂的工程難題,基于結構動力學理論,視豎嚮預應力精軋螺紋鋼觔外露段為懸臂樑,將錨固段用一箇剛臂和兩箇彈性支承模擬,建立豎嚮預應力觔的平麵彈性支承模型。結閤模型試驗數據,建立精軋螺紋鋼觔張拉力P與平麵彈性支承剛度K的非線性關繫模型。通過室內模型試驗及錨固段剛度增大繫數法驗證本研究方法的有效性,併進行工程應用。引入豎嚮預應力張拉力無損檢測方法進行箱樑豎嚮預應力張拉施工質量的鑑測,張拉力閤格率由58.0%提高至96.8%,有效提高瞭豎嚮預應力的施工質量。同時提齣瞭箱樑施工期需要提高錨墊闆安裝精度的工程措施。
위유효검측수향예응력근적유효장랍력병제고수향예응력적시공질량,해결상량유우수향예응력손실과대이도치상량복판개렬적공정난제,기우결구동역학이론,시수향예응력정알라문강근외로단위현비량,장묘고단용일개강비화량개탄성지승모의,건립수향예응력근적평면탄성지승모형。결합모형시험수거,건립정알라문강근장랍력P여평면탄성지승강도K적비선성관계모형。통과실내모형시험급묘고단강도증대계수법험증본연구방법적유효성,병진행공정응용。인입수향예응력장랍력무손검측방법진행상량수향예응력장랍시공질량적감측,장랍력합격솔유58.0%제고지96.8%,유효제고료수향예응력적시공질량。동시제출료상량시공기수요제고묘점판안장정도적공정조시。
In order to effetively detect the tension of vertical prestressing bars to improve the construction quality and to solve the engineering problem of the cracking at box girder webs caused by vertical excessive prestress loss, the exposed section of fine rolled twisted bar was assumed as a cantilever beam based on the dynamic theory, and the anchoring sec-tion of vertical prestressed steel was simulated by one rigid arm and two elastic supports.Then, the plane elastic sup-porting model was established.The nonlinear model between tension P of fine rolled twisted bar and elastic support stiffness K was put forth based on the experiment data of this model.The proposed method was verified by model test and a method based on flexural rigidity of the exposed segment in the anchorage zone, and this method was applied in the actual bridge engineering.The non-destructive detection method of vertical prestressing was used at the construction period of box girders, the qualified rate of vertical prestress increased from 58.0% to 96.8%, and the construction quality of vertical prestressing was effectively improved.Based on this research, the engineering measures were pro-posed to improve the anchor plate mounting precision.