预应力混凝土连续箱梁桥裂缝控制

Cracking control of PC continuous box girder bridges

根据预应力混凝土连续箱梁普遍开裂的工程实际 ,结合有限元分析结果 ,对计算方法、混凝土控制应力、温度梯度模式、腹板预应力束布置等抗裂因素提出了设计建议。从跨径比例、箱梁断面尺寸、非预应力钢筋的设置等几方面介绍了防裂构造措施。

Based on cracking situation and finite element analysis of PC continuous box girder bridges,design recommendations about calculation method,concrete stress limitation, temperature gradient and prestressing tendons are discussed.Construction measures on cracking resistance are also presented.