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中间锚固区受到锚前扩散和锚后牵拉的双重作用,是桥梁结构中典型的应力扰动区。首先,通过弹性应力分析和主应力迹线分析,揭示了中间锚固区的受力特点,得到了锚固力经由锚前扩散和锚后牵拉的分配比例。进而,构建了能真实反映中间锚固区力流传递的拉压杆模型,并依据最小应变能原理对模型的构形进行了优化。最后,利用拉压杆模型的静力平衡条件,得到了锚前劈裂力和锚后斜向牵拉力的解析计算公式,其计算精度通过与有限元积分结果对比得到了验证。
The middle anchorage zone is affected by both the pre-anchor diffusion and the anchor-pull, which is a typical stress disturbance zone in the bridge structure. First of all, through the analysis of elastic stress and principal stress trace analysis, the stress characteristics of the middle anchorage zone are revealed, and the distribution ratio of the anchorage force through the anchorage and the anchorage is obtained. Furthermore, a tension and compression rod model that can truly reflect the force transmission in the middle anchorage zone is constructed, and the configuration of the model is optimized according to the principle of minimum strain energy. Finally, by using the static equilibrium condition of the tension-compression rod model, the analytic formula of the pre-anchor splitting force and the oblique pulling force after the anchor is obtained. The calculation accuracy is verified by comparison with the finite element integral result.