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为了得到一个简捷、实用、可靠的体外预应力筋极限应力设计值的计算公式,结合48片试验梁的试验数据,对常见的九种计算方法进行了评价和分析。基于评价分析结果,首先选取与试验结果相比计算准确度较高且便于应用的计算模式,然后对计算模式进行修正以满足桥梁设计的要求,最终得到一种桥梁体外预应力筋极限应力设计值的计算公式。给出两个体外预应力筋加固钢筋混凝土简支梁桥和预应力混凝土连续梁桥的极限应力计算示例,验证了公式的正确性,可供桥梁加固工程参考。
In order to obtain a simple, practical and reliable formula for calculating the ultimate stress of externally prestressed tendons, nine common calculation methods were evaluated and analyzed based on the experimental data of 48 test beams. Based on the results of the evaluation analysis, the calculation model with higher calculation accuracy and easier application than the test results is selected, and then the calculation mode is modified to meet the requirements of the bridge design. Finally, a design value of the ultimate stress of the external prestressed tendons of the bridge The formula. The calculation examples of the ultimate stress of reinforced concrete simply supported beam bridges and prestressed concrete continuous beam bridges with two external prestressing tendons are given. The correctness of the formula is verified and it can be used as a reference for the strengthening of bridges.