CAJ | 학술논문

在工程实际中，通常需要在满足静力需求的基础上大幅提高塔底和横梁截面的配筋率来满足斜拉桥桥塔在罕遇地震作用下既定的性能目标，这种做法不仅不够经济，同时也增加了下部桩基础的抗震需求。通过对 H型桥塔斜拉桥桥塔结构设计参数进行研究，探讨了斜拉桥桥塔上横梁位置、塔柱横梁刚度比、上横梁与塔柱的约束条件以及桥塔上横梁进入塑性的程度对斜拉桥桥塔横桥向地震响应的影响。结果表明：斜拉桥桥塔上横梁位置变化、横梁刚度变化以及考虑上横梁的屈服耗能均能改变桥塔横桥向的地震响应，但结果并不显著，而改变上横梁与塔柱的约束条件能显著降低桥塔的横桥向地震需求。
재공정실제중，통상수요재만족정력수구적기출상대폭제고탑저화횡량절면적배근솔래만족사랍교교탑재한우지진작용하기정적성능목표，저충주법불부불구경제，동시야증가료하부장기출적항진수구。통과대 H형교탑사랍교교탑결구설계삼수진행연구，탐토료사랍교교탑상횡량위치、탑주횡량강도비、상횡량여탑주적약속조건이급교탑상횡량진입소성적정도대사랍교교탑횡교향지진향응적영향。결과표명：사랍교교탑상횡량위치변화、횡량강도변화이급고필상횡량적굴복모능균능개변교탑횡교향적지진향응，단결과병불현저，이개변상횡량여탑주적약속조건능현저강저교탑적횡교향지진수구。
According to our current bridge seismic design codes ,the bridge tower is explicitly required to remain almost elastic even under the excitation of occasionally happened earthquake .To achieve this seismic performance objective ,usually the steel ratios of tower base and strut are required to satisfy the static loading demand and increase by a large margin as well in most engineering practices which leads to engineering inefficiency as well as a rising seismic demand for the substructure .Therefore ,the structural design parameters including the location ,the stiffness and the constrain condition of the strut with respect to the tower column of H shape tower were studied to explore their effect on the transverse seismic responses of cable‐stayed bridge tower ,Moreover ,the effect of yield intensity of the strut on the seismic responses of the tower column is also studied .The results show that the location and the stiffness of the strut have a slight effect on the seismic responses while the transverse seismic demands of the bridge tower decrease drastically when the constrain condition between the cross beam and the tower column changes .