某斜拉桥预应力混凝土桥塔日照温度应力研究

分析了预应力混凝土桥塔塔壁在日照作用下随时间变化的温度应力。采用将太阳辐射与气温折算成综合温度的方法,得出了桥塔在日照作用下的表面温度。利用有限元方法,分析了桥塔断面在日照温度作用下的温度应力。分析结果表明:在夏季日照作用下,桥塔外围处于受压状态,桥塔内部处于

Study on Sunshine Temperature Stress in P C Pylon of a Cable-stayed Bridge

The varying temperature stress in the prestressed concrete pylon caused by sunshine is analyzed in this paper.By using the method of integration temperature converted by the sun radiation and ambient temperature,the outside temperature of the pylon in sunshine is researched.The temperature stress in the cross section of the pylon in sunshine is educed by the finite element method.The result indicates that in the summer sunshine,the exterior pylon is in compression,while the interior pylon is in tensile which is unable to cause crack.But in the winter sunshine,the tension stress concentration appears at southeast,southwest and northeast corner of the pylon.If it adds the additional tension stress caused by tensioning the tendons,the crack will appear.