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中文摘要：
对桥梁改扩建工程,合理选择钢筋混凝土既可以保证承载力的设计要求,又能有效节约成本.对提高普通钢筋、混凝土等级的4根PPC梁进行抗弯试验研究.分析挠度、刚度等力学性能,结合经济分析得出只考虑静力荷载作用或鲜有过往车辆的桥梁改扩建工程可优选提高普通钢筋等级.
英文摘要：
For the bridge expansion project, choosing the right reinforced concrete can ensure the requirement of bearing capacity designs, and save the cost effectively. Four PPC beams with improved ordinary reinforcing bars and concrete grades were chosen as subjects for bending test. By analysing the mechanical properties of deflection, stiffness and combined with economic analysis, bridge renovation project if under static load or with few passing vehicles can be optimized to improve the ordinary steel grade.
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