一种适用于重点设防类高层单跨钢连廊的结构设计

Structural design of a high-rise single-span corridor suitable for key fortification

为满足《建筑抗震设计规范》(GB 50011—2010)对单跨框架结构应用场合的条文规定和建筑使用功能要求,提出一种适用于重点设防类高层单跨连廊的结构体系:X向为两跨框架+桁架结构,Y向为框架-支撑结构。分别采用静力弹性分析和动力弹塑性分析对本连廊进行计算。结构静力弹性分析结果表明:施工模拟顺序对结构的内力影响较小,连廊在X向本质上是一个单层双跨框架结构。连廊性能化设计结果表明其能达到中震弹性、大震不屈服的性能目标。连廊的非线性屈曲分析和连续倒塌分析结果表明:桁架受压斜腹杆屈曲会引发结构整体失稳;桁架受压斜腹杆、框架角柱和框架边柱失效不会引发结构连续性倒塌。最后对连廊进行罕遇地震和极罕遇地震作用下的动力弹塑性分析,结果表明:结构受力性能良好,构件损伤控制在“中度破坏”以内,能够满足规范大震不倒的设计要求。

In order to meet the requirements of the Code for seismic design of buildings(GB 50011—2010)for the application of single-span frame structure and the functional requirements of building,a structural system suitable for the high-rise single-span corridor of key fortification was proposed.The structural system is a two-span frame+truss structure in X direction,and a frame-support structure in Y direction.The static elastic analysis and dynamic elastoplastic analysis was used to compute the corridor.The results of static elastic analysis of the structure show that the construction simulation sequence has little effect on the internal force of the structure,and the corridor is essentially a single-layer double-span frame structure in X direction.The performance-based design results of the corridor show that it can achieve the performance goal of elasticity under moderate earthquake and non-yield under major earthquake.The results of nonlinear buckling analysis and progressive collapse analysis of the corridor show that the buckling of the truss compression oblique web member will cause the overall instability of the structure;the failure of truss compression oblique web member,frame corner column and frame side column will not cause structural progressive collapse.Finally,the dynamic elastoplastic analysis of the corridor under rare earthquake and extremely rare earthquake was carried out.The results show that the structural performance is good,and the damage of the components is controlled within‘moderate damage’,which can meet the design requirements of the code for non-collapse during large earthquake.