考虑抗震性能的非对称型钢混凝土节点优化设计方法

An Optimal Design Method for Asymmetric Profile Steel JointsConsidering Seismic Performances

复杂大跨度建筑中非对称节点逐渐增多,其非对称性主要体现在构件尺寸不同、含钢率不同等,与常规对称节点相比,非对称节点在传力机理、破坏模式、承载性能上存在诸多差异,因此不能完全按照现有常规节点的计算方法进行设计。基于此,参考国内某工程非对称节点,采用ABAQUS软件进行三维建模,通过节点滞回曲线、骨架曲线、节点应力及损伤分布分析非对称节点下的抗震性能特点,并以此时的峰值荷载作为后续优化的抗震性能标准;进一步采用人工蜂群算法,以混凝土截面尺寸、型钢尺寸为输入条件,以抗震性能为边界条件、以经济性为目标函数,基于Python语言对ABAQUS进行二次开发,自动计算各设计参数组合下的抗震性能计算结果,并最终给出最优设计组合,实现了非对称型节点优化设计,提高建筑设计精细化、智能化水平。

The number of asymmetrical joints in complex long-span buildings is gradually increasing.The asymmetry is mainly reflected in different component sizes and different steel ratios.Compared with conventional symmetrical joints,there are many differences in the force transmission mechanism,failure mode and bearing properties of asymmetrical joints,so the design cannot be completely based on the calculation method of the existing conventional joints.Based on this,taking the asymmetric joints of a project in China as an example,ABAQUS software was used to conduct three-dimensional modeling.The seismic performance characteristics of asymmetric joints were analyzed through the hysteresis curve,skeleton curve,stress and damage distribution of joints,and the peak load at this time was taken as the seismic performance standard for subsequent optimization.Using the artifical bee colony algorithm,with the interface size and profile steel size as the input conditions,the seismic performance as the boundary condition,and the economy as the objective function,the secondary development of ABAQUS based on the Python language was carried out,and the optimal interface size and content were automatically calculated.The combination of steel ratio realized the optimal design of asymmetric joints.The research results could improve the level of refinement and intelligence in architectural design.