高温河谷环境大跨度连续刚构桥预应力混凝土早期张拉力学性能研究

文章以云南省高速公路大跨度连续刚构桥为依托,研究了不同养护条件下大跨度连续刚构桥箱梁预应力混凝土的抗压强度、轴心抗压强度和静弹性模量的变化,对比不同规范对预应力混凝土张拉条件的规定。研究结果表明:高温河谷环境对预应力混凝土的早期力学性能具有一定的影响,综合不同养护条件的试验结果和标准规定,养护龄期达到6d时各项性能均满足预应力混凝土的张拉要求。

Study on the Early Tensile Behavior of Prestressed Concrete of Long-span Continuous Rigid Frame Bridge in High Temperature Valley Environment

Based on the long-span continuous rigid frame bridge in Yunnan Province,this paper studies the changes of compressive strength,axial compressive strength and static modulus of elasticity of prestressed concrete of long-span continuous rigid frame bridge box girder under different maintenance conditions,and compares the provisions of different specifications on prestressed concrete tension conditions.The results show that:high temperature valley environment has a certain impact on the early mechanical properties of prestressed concrete,comprehensive test results of different curing conditions and standard provisions,when the curing age reaches 6 days,all properties meet the tensile requirements of prestressed concrete.