隔层耗能桁架式抗侧力体系的静力性能研究

Research on Static Properties of the Alternation Story-Height Truss Lateral-Load-Resisting System

针对立体停车结构的使用功能和结构特点,提出了隔层耗能桁架抗侧式立体停车结构,分析了水平荷载作用下隔层耗能桁架式抗侧力体系的侧移性能与承载力,并与框架及偏心支撑框架体系的性能进行了比较.分析了不同情况下空腹节间梁段的长度变化对结构抗侧刚度与空腹节间梁段内力的影响规律.研究表明,隔层耗能桁架式抗侧力体系具有和偏心支撑框架相同的抗侧刚度及更高的承载能力;随着空腹节间梁段长度的增大,结构抗侧刚度与空腹节间梁段的剪力逐渐减小,而弯矩则先增大后减小;综合结构性能要求与构造因素,空腹节间长度宜取结构跨度的0.05～0.1倍.

In this paper,the three-dimensional parking structure with the alternation story-height truss lateral-load-resisting system is put forward based on the characteristics and functions of parking.And for the alternation story-height truss lateral-load-resisting system in it,lateral drift and horizontal load-carrying capacity are studied and compared with those of the framework and eccentrically braced framework.The influence of the length of the vierendeel panel of the truss upon the static properties of the lateral-load-resisting system in different cases is investigated.The results show that,the alternation story-height truss lateral-load-resisting system has the identical lateral stiffness with the eccentrically braced framework but higher load-carrying capacity;with increase of the length of the vierendeel panel of the truss the lateral stiffness of the system and shear force of the beams at the vierendeel panel decrease,whereas,the bending moment of the beams increases first and then decreases.Synthesizing the performance and the conformation requirement of the system,the length of the vierendeel panel should be taken as 5~10 percent of the span of the truss.