新型转换结构的试验研究及其在建筑物外套框架增层工程中的应用  

Experimental study and application resersh of a new transfer structure on extension-story buildings

作　　者：张鑫[1] 吕西林[2] 李安起[1] 

机构地区：[1]山东建筑大学土木工程学院,山东济南250014 [2]同济大学土木工程学院,上海200092

出　　处：《建筑结构学报》2008年第4期118-126,共9页Journal of Building Structures

摘　　要：腹板柱复合空腹桁架转换结构（以下简称腹板柱转换结构）是一种新型的结构形式。通过在框架梁间的适当位置设置腹板柱,使梁上出现多个弯矩峰值点,同时弯矩峰值也大大降低,从而优化结构的内力分布。通过模型试验对腹板柱转换结构进行了抗震性能试验研究,在水平往复荷载作用下的试验结果表明结构各层跨中梁梁端形成塑性铰,随后底层柱两端开始屈服并最终形成塑性铰;结构开始为弯曲变形,结构屈服后也出现剪切变形,抗震变形能力较好;各层结构位移延性系数处于现行抗震规范对结构延性系数3.6-7.33的合理要求范围内,结构的侧移和层间弹塑性位移角限值也满足有关规范要求,但结构底层位移延性系数较大;随着顶点位移角的增大,侧移刚度逐步衰减,但侧移刚度衰减速度由快逐渐变慢。结合工程应用对该结构形式提出了设计建议,设计时要提高底层和2层跨中梁端部的配筋率;适当加大底层柱截面形成变截面柱;对一层或几层梁施加预应力;提出了腹板柱设置位置和刚度要求。该结构在某建筑物外套框架增层工程中得到应用,取得了满意的效果。Composite truss transfer structure with web-type column （web-type column transfer structure） is a new structure where web-type columns are set up between beams. The function of web-type columns is to adjust the moment of the structures. It can realize reasonable distribution of moment in structures. It reduces the peak value of moment in the end of girders and makes the moment balance in the whole structure. This paper presents the experimental study of seismic behavior on web-type column transfer structure. The experimental results showed that the plastic hinges emerged from the beam ends in the middle spans of the frame structures under the lateral cyclic loads. The columns were yielded and the plastic hinges were formed in the first floor with the increase of loads. The failure started firstly in the beam normal section, the shearing deformation was presented after the structure yielding. The structure has approximate resistance of seismic to normal structures. The structural ductility coefficients are in the rational range required by the seismic structural code, in which the ductility coefficient is set to be 3.6-7.33. The allowable values of the lateral displacement and the drift elasticity-plasticity angle satisfy the requirement of the relevant codes. However, the structural ductility coefficient in the first story is larger than that of other stories. The lateral displacement stiffness is reduced gradually, which slows down in the process of loading action. The suggestion on design has been given. The percentage of reinforcement at the ends of middle span beams in the first and the second floors should be increased. The sizes of column section may be enlarged, which become the non-uniform cross-section columns. Pre-stress is applied to the first storey or many stories. The location and stiffness requirement of webtype column are proposed in this paper. This transfer structure is successfully applied to extension-story engineering of building.

关 键 词：钢筋混凝土 转换结构 腹板柱 试验研究 破坏机理 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1