【摘要】 坡地掉层结构上接地柱与地面采用固接时由于强约束条件导致地震中上接地柱破坏严重,改变支座约束方式是改善其抗震性能的途径之一。对坡地框架结构上接地柱的底端采4四类不同的约束方式,设计不同掉层跨数和层数的算例,进行多遇和罕遇地震作用下掉层结构的抗震性能分析,考察不同上接地柱端约束方式对掉层结构抗震性能的影响规律。结果表明,当上接地柱底端为固接时,掉层框架薄弱层在上接地1、2层,掉层跨数和层数越多,上接地层柱底梁端破坏越严重;上接地柱采用铰接支座时,上接地层的侧向变形较大,上接地柱柱端破坏向其上端、上层转移;上接地柱采用隔震支座或者滑动支座时,薄弱层位于掉层部分,掉层跨数越少破坏越严重,掉层跨数占结构总跨数的4/5时,掉层部分破坏较轻。建议掉层跨数较多时上接地柱采用隔震支座或者滑动支座。更多还原

【Abstract】 The upper ground columns of the first floor were damaged severely in structures supported by foundations at different locations due to strong constraint conditions. Different constraint conditions of the columns resulted in different seismic performance of structures. The seismic performance of frame structure on the slope under frequent and rare earthquake was analyzed through a number of calculating examples with different spans, floors, and four types of constraint conditions for upper ground level. The effect laws of different constraint conditions of the upper ground columns for the seismic performance of the structures were discussed. The results show that when the supports of upper ground columns are fixed ends, the weak story is generally located at the first and second floors on the upper ground. The larger the number of the floors and the spans of the structure on the lower ground is, the more seriously damage of the upper ground column ends will occur. When the supports of ground columns are pinned ends the lateral deformation of the ground floor are larger, the upper ground column damage may be transferred to its upper end and the upper floor. When the ground columns are supported by vibration isolation supports or sliding supports, the weak story is located at the floors on the lower ground. The less the span number is, the more seriously damage will occur. However, when the span number of structure on the lower ground accounted for 4/5 of the total structure span number, the structures on the lower ground were damaged lighter. Vibration isolation supports and sliding supports are suggested when span number on the lower ground level is large.更多还原