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在对一重达419.3t的特载车能否安全通过一跨径为16m的预应力混凝土空心板,针对空心板建立了实体模型:通过采用桥梁荷载试验分析系统(BLT)建立实体模型及桥梁博士分别求出横向分布系数,根据荷载试验结果修正模型,通过试算,当考虑铺装层刚度及混凝土弹性模量提高1.15倍时,实测值和理论值较为吻合。通过桥梁博士建立单梁模型,进行特载车过桥安全验算,验算证明:承载能力极限状态,中板、边板正截面抗弯及斜截面抗剪均能满足要求;正常使用极限状态,中板、边板正截面、斜截面抗裂均不满足规范对预应力混凝土A类构件的要求。
A solid model of a hollow slab can be established on a pre-stressed concrete hollow slab with a span of 16 m, for the safety of a 419.3t special carrier: building a solid model with bridge load test and analysis system (BLT) The horizontal distribution coefficient was calculated respectively. According to the load test results, the model was revised and the trial calculation was conducted. When considering the stiffness of pavement and the modulus of elasticity of concrete increased by 1.15 times, the measured and theoretical values are in good agreement. Through the bridge beam doctor to establish a single beam model, special vehicles cross-bridge safety checks, checking proved: ultimate bearing capacity, plate, cross-section bending and diagonal cross-section shear can meet the requirements; normal use limit state, The normal cross-section and crack-resistant cross-section of the slab, the slab do not satisfy the requirements of the Class A component of prestressed concrete.