Static behavior of semi-rigid thin-walled steel-concrete composite beam-to-column joints with bolted partial-depth flush end plate:experimental study

A new type of semi-rigid thin-walled steel-concrete composite beam-to-column joint has been proposed in this paper.Five semi-rigid composite beam-to-column joint specimens subjected to hogging moments under monotonic loading were tested to study the static behavior of this new type of joint.The main variable parameters for the five joint specimens were the longitudinal reinforcement ratio and the joint type.The experimental results designated that the magnitude of extension of the longitudinal reinforcement is the most important factor that influenced the moment-rotation characteristic of the new type of joint.The concrete slabs could resist 3.8%-19.1% of the total shear load applied to the cross-sections near the beam-to-column connection.The edge stiffened elements,such as the flange of the lipped I-section thin-walled steel beam,were capable of having considerable inelastic deformation capacity although they had comparatively large width-to-thickness ratios.The shear failure of the concrete cantilever edge strip must be taken into account in practical design because it has significant influence on the anchorage of the longitudinal reinforcement in the new type of external joints.     

援塔吉克斯坦议会大楼项目结构设计

塔吉克斯坦议会大楼的抗震设防烈度9度(0.4g),建筑高度74.94m,建筑平面轮廓尺寸185m× 115m,通过设置变形缝(兼防震缝)将主体结构分为4个结构单元,均采用框架-剪力墙结构体系.对地震作用的塔方计算方法进行了详细介绍,对中塔双方计算地震位移和配筋设计时的地震效应进行了对比分析,判定结构是否超限并结合塔方特殊技术条款制定出合理的加强措施.介绍了小震弹性分析结果和中震不屈服设计参数,利用大震静力弹塑性分析查找了结构的薄弱部位和评估结构的抗震性能,最后指出援外项目设计时需注意的一些问题.结果 表明,本项目按中国规范进行抗震设计满足塔方规范要求,加强措施合理,整体结构及构件设计满足性能化目标.     

薄钢混凝土柱穿心肋板铰接节点试验研究

提出了在薄钢-混凝土柱中设置穿心肋板,并通过螺栓与钢梁铰接连接的新型节点形式。通过11个试件的试验研究,探讨了薄壁设肋方钢管混凝土柱中穿心肋板的抗剪承载力。试验结果表明,所有试件的穿心肋板均能与柱可靠连接、合理受力,试件的破坏模式为穿心肋板受剪撕裂破坏或螺栓孔承压破坏。肋板因主要承受剪力而发生了明显的剪切变形,试件的试验屈服承载力与按Von Mises屈服准则计算的屈服承载力较一致。