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大跨PC连续刚构桥的0~#块可视为大体积混凝土,因此水泥水化热所产生的热量会使结构升温,导致刚构桥0~#块早期可能会生成温度裂缝,从而影响桥梁整体的安全性及耐久性。依托红岩溪特大桥,采用ANSYS软件瞬态热分析法计算在外界温度影响下0~#块水化热温度场,并将结果与实测数据作比较,吻合度较好,将温度场施加至结构中,计算出应力场。由结果可知:0~#块各位置板厚度越大,中心位置温度峰值越大,达到最大值时间越长。水化热产生的最大主拉应力在3.20~4.59 MPa之间,超过了混凝土设计抗拉强度,因此文中提出在大跨PC连续刚构桥0~#块中采用新型硅粉聚丙烯纤维混凝土材料,以其良好的早期抗拉强度,能够较大的改善结构的抗裂性能。
Large span PC continuous rigid frame bridge 0 ~ # block can be regarded as mass concrete, so the heat generated by the cement hydration heat the structure, resulting in rigid framed Bridge 0 ~ # early may generate temperature cracks, thus affecting Bridge overall safety and durability. Relying on the Hongyanxi Bridge, transient thermal analysis with ANSYS software was used to calculate the temperature field of hydration heat of 0 ~ # block under the influence of outside temperature. The results were compared with the measured data, and the coincidence degree was good. The temperature field was applied to In the structure, the stress field is calculated. From the results we can see: 0 ~ # block the greater the thickness of the plate position, the center of the peak temperature the greater the maximum time to reach the longer. The maximum principal tensile stress caused by hydration heat is between 3.20 and 4.59 MPa, which exceeds the designed tensile strength of concrete. Therefore, a new type of silica fume polypropylene fiber reinforced concrete , With its good early tensile strength, can greatly improve the structural crack resistance.