某会展中心室内大跨度钢结构连廊结构设计与分析

Structural Design and Analysis of Large-span Steel Corridor in a Exhibition Center

本文以广州某会展中心室内38 m大跨度连廊为对象进行设计分析。采用钢箱梁-砼组合结构型式,运用MIDAS GEN软件建立结构有限元模型,分析钢结构连廊的整体刚度、构件应力以及动力特性,并对比国内外的舒适度标准进行评价。分析结果表明,钢结构各构件最大应力值介于121 MPa~156 MPa之间,混凝土楼板最大压应力值为15.0 MPa,满足承载力要求;第一阶横向自振频率为5.9 Hz,可不考虑人群横向荷载激励作用,第一阶竖向自振频率为1.8 Hz,容易产生人行共振效应;人行激励竖向振动加速度最大值为0.19 m/s^(2),结合不同使用场景的舒适度标准,评价各工况下的峰值加速度可满足要求;增设谐调质量阻尼器(Tuned Mass Damper,TMD),可有效降低连廊的竖向振动加速度约60%,提高使用标准。本文的研究结果可以为室内大跨度连廊的结构设计工作提供参考与借鉴。

This article focuses on the design analysis of a 38-meter large-span indoor corridor in a certain exhibition center in Guangzhou.Employing a steel box beam-concrete composite structural form,a finite element model of the structure is established using MIDAS GEN software.The overall stiffness,component stresses,and dynamic characteristics of the steel structure corridor are analyzed,and comparisons with domestic and international comfort standards are evaluated.The analysis results indicate that the maximum stress values of the steel structure components range from 121 MPa to 156 MPa,and the maximum compressive stress value of the concrete floor slab is 15.0 MPa,meeting the load-bearing requirements.The first-order lateral natural frequency is 5.9 Hz,indicating that lateral crowd load effects may be disregarded.The first-order vertical natural frequency is 1.8 Hz,which easily to generate pedestrian resonance effect.The peak vertical vibration acceleration under the most adverse conditions is 0.19 m/s^(2).Combining comfort standards for different usage scenarios,the evaluation of peak acceleration under various conditions meets the requirements.Adding a Tuned Mass Damper(TMD)can effectively reduce the vertical vibration acceleration of the corridor by about 60%and improve its usage standards.The research results of this article can provide reference and guidance for the structural design of indoor large-span corridors.