摘要
某连体建筑钢筋混凝土连廊楼板的抗震设防目标需达到"小震不裂、中震不坏",即小震时混凝土核心层不裂,中震时楼板应力不大于混凝土抗拉强度标准值。由于铰接钢梁支座处的转角变形较大,导致连廊楼板支座处轴力、弯矩较大,在支座处布置后浇带能显著改善楼板的抗裂性能。中震强度设计时,可考虑受压区钢筋对截面抗拉的有利影响,以降低板配筋量。单位长度上的栓钉剪切刚度可通过理论方法求得,考虑剪切刚度有限导致的栓钉滑移后连廊楼板两端受力减小,跨中压应力则增加,但仍小于混凝土抗拉强度标准值。
The seismic fortification target of a reinforced concrete corridor floor of a connecting building was"small earthquake without cracking,medium earthquake without damage",that is,concrete core layer without cracking during small earthquake,and floor stress is not greater than the standard value of concrete tensile strength during medium earthquake.Because of the large angular deformation at the support of articulated steel beam,the axial force and bending moment at the support of corridor floor are larger,and the post-pouring belt at the support can significantly improve the crack resistance performance of the floor.In the strength design under medium earthquake,the beneficial effect of steel bar in compression zone on the tensile strength of section can be considered,in order to reduce the reinforcement quantity of corridor floor.The shear stiffness of stud per unit length can be calculated by theoretical method.Considering the stud slippage caused by limited shear stiffness,the force at both ends of the corridor floor decreases,while the mid-span compressive stress increases,but it is still less than the standard value of concrete tensile strength.
作者
张玉
ZHANG Yu(CCDI Design Group,Shanghai 200433,China)
出处
《施工技术》
CAS
2019年第S01期391-396,共6页
Construction Technology
关键词
连体建筑
连廊楼板
抗裂性能
配筋
栓钉滑移
connected building
corridor floor
crack resistance performance
reinforcement
stud slippage
