钢筋混凝土阶形柱的上柱是抗震中的薄弱环节

通过阶形柱的伪静力试验,发现按当量地震力的抗震设计方法,单层厂房阶形柱上柱的安全储备即使设计得大于下柱的,其最后的破坏程度仍比下柱的严重。从实际的震例分析中,也证实了这个现象。为了达到等强度的设计,提出按现行设计方法设计时,需适当加强上柱的安全储备及其延性。同时还对上述现象的原因作了探讨,这对于弄清震害机理,正确理解与分析震害现象,有积极的意义。

The Upper Part of Reinforced Concrete Step-Column Is the Most Weak Place In Earthquake

Through pseudostatic test, it was found that the upper part of reinforced concrete step-column of single storey industrial building was damaged more serious than that of the lower part, even a large safety factor for the upper part was reserved than the lower part in the structural-member aseismic design under equivalent seismic force. The phenomenon was verified by the analyses of damaged buildings in earthquake. In order to obtain equal-strength both in upper and lower columns, an increase in safety factor and ductility of upper column is more preferable while using the present design method.The reasons of above phenomenon was studied in this part as well. Such study is of positive significance to comprehend the mechanism of seismic damage and to analyze correctly the actual seismic damage examples.