Based on the design code of concrete structure (GBJ10-89), the paper gives the nominal tensile stress method of controlling crack width in prestressed concrete structure of punchy bars.
以混凝土结构设计规范(GBJ10—89)为基础。建立了强力钢筋做预应力筋的预应力混凝土结构用名义拉应力控制裂缝宽度的方法。
Established the calculation model of waterproof layer tensile above bridge crack, compute a minimum extension and strength the waterproofing layer must have hi a certain width crack.
建立了桥面裂缝之上防水层张力的计算模型，有效地计算出桥面混凝土一定宽度裂缝上防水层须具备的最小延伸率和拉伸强度。
Its results show that with decreasing the relative width of under-matching weld metal, the tensile strength of welding joint increase.
结果表明：随低强焊缝金属相对宽度变小，接头抗拉强度增大；
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