压弯剪扭型钢混凝土柱在实际工程中的运用

何叶 刘清颖 马江萍 张奎

摘 要：随着建筑外形复杂化，功能多样化，为了外立面的造型效果，大跨度悬挑结构越来越常见。考虑到此类结构在悬挑部位通常抗震不利，容易破坏，通过对比受力性能好的型钢混凝土柱与传统大截面的钢筋混凝土柱，选择抗震性能良好、截面相对较小的型钢柱。对受力复杂的压弯剪扭型型钢混凝土柱进行了受力分析，使用有限元软件对结构进行了弹性时程分析及动力弹塑性损伤分析，罕遇地震下能量耗散规律分析，结果表明结构能够满足三水准的抗震要求，对其安全性、合理性进行了验证。本文通过实际工程案例，对受力复杂的压弯剪扭型钢柱，大跨度悬挑，单榀结构，楼板开大洞等重难点问题，提出相对安全可靠的加强措施，增加结构的安全储备。

关键词：型钢混凝土柱;工程运用;弹塑性分析;压弯剪扭

中图分类号：TU318 文献标识码：A 文章编号：1001-5922（2021）06-0106-05

Abstract：With the complex appearance of buildings and diversified functions， large-span cantilever structures are becoming more and more common for the modeling effect of the facade. Considering that this type of structure is usually unfavorable for earthquake resistance and easy to damage at the overhanging part， by comparing the steel concrete column with good mechanical performance and the traditional large-section reinforced concrete column， the steel column with good seismic performance and relatively small section is selected. The force analysis of the compression bending shear torsion steel concrete column with complex forces is carried out， the elastic time-history analysis and dynamic elastoplastic damage analysis of the structure are carried out using finite element software， and the law of energy dissipation under rare earthquakes is analyzed. The results show that The structure can meet the three-level seismic requirements， and its safety and rationality have been verified. Based on actual engineering cases， this paper proposes relatively safe and reliable strengthening measures to increase the safety reserve of the structure for difficult problems such as the complicated compression bending shear torsion steel column， the large span cantilever， the single structure， and the large hole in the floor.

Key words：steel reinforced concrete column; engineering application; elastoplastic analysis; bending， shear and torsion

现代生活中，人们对于建筑物造型要求越来越高，形式越来越复杂，造型需要更加的“夺人眼球”，大跨度悬挑结构越来越多，本工程为超长多层单榀结构形式，建筑两端为单柱布置，单柱外悬挑6.7m，6段标准层建筑图，4段、5段、6段建筑效果图，6段结构模型图分别如图1～3所示。

本工程的设计使用年限为50年，采用钢筋混凝土结构，结构的安全等级为二级，安全重要性系数采用1.0，抗震设防烈度为8度，设计地震基本加速度值为0.20g，地震分组为第二组，场地设计特征周期为0.55s，标准设防类……