The results indicate that it is conservative to design CFST arch Bridges by using allowablestressmethod in steel tube, and that it is reasonable to use limit state method.
数例表明，目前广泛应用钢管应力控制CFST的设计过于保守，文中方法似更合理。
2
Selection basis and method on allowable contact stress of rolling ball-socket nozzle were described. Based on empirical formula and test data, several factors affecting allowable stress were analyzed.