SEismic performance of steel-concrete composite MOment REsisting frames – Effect of system reduction in testing and modelling (SEeMOREEffect)

该研究计划概述了Ruhr-Universität Bochum的钢、轻量化和复合结构主席将进行的关于系统减少对钢-混凝土组合框架抗震性能的影响的预期调查。该方案介绍了抗弯矩组合框架结构和双钢管混凝土柱的背景，对钢筋混凝土框架进行了系统缩减的影响，以及迄今为止的纯数值研究，以及一个全面的工作包计划。钢管混凝土-钢-混凝土组合抗弯矩框架是一种现代结构，作为建筑结构的主要承重体系，特别是在地震荷载作用下，具有显著的优势。双钢管混凝土是钢管混凝土结构有意义和有效的发展。CFDST为高负载水平和快速施工过程提供了细长的建筑解决方案。这种整体结构的整体性能和抗震性能评估主要基于实验，这些实验主要分别在小单元和简化体系上进行。将这样一个全局系统简化为小单元进行实验测试，会自动导致在评估总体性能时不考虑个别影响。实验研究中体系折减对整体框架结构抗震性能的影响尚缺乏系统的研究。因此，seemoreeffects项目的主要研究问题如下：(i)在试验设置和试验程序中，复杂框架结构的系统缩减对地震荷载下现代复合mrf结构的基本性能有什么影响？（ii）这些影响能否同样程度地反映在一个可靠的模型中，以预测框架子结构的地震行为？（iii）是否有可能通过分析方法捕捉这些影响，将它们包括在替代模型中，以便分析整体框架结构的地震行为？seemoreeffect项目旨在通过一个综合的工作计划来回答这些问题，其中包括基于数值和分析的软件包，并侧重于有针对性和严格的大型试验样品测试计划。因此，seemoreeffect项目是第一个系统的研究，利用直接比较复合子结构和子组件的实验结果来分析系统缩减程度的影响，从而分析实验技术对全球地震行为评估的影响。

This research plan outlines the intended investigations to be performed by the Chair of Steel, Lightweight and Composite Structures of the Ruhr-Universität Bochum on the influence of system reduction on the seismic performance of steel-concrete composite frames. The plan presents the background of moment resistant composite frame structures and on concrete-filled double steel tube columns, the effects of system reduction – conducted for reinforced concrete frames and pure numerical investigations so far – as well as a comprehensive work package plan. Steel-concrete composite moment-resisting frames (MRFs) with concrete-filled steel tubes (CFSTs) are modern structures that offer significant advantages as main load-bearing systems in building structures, especially under seismic loads. Concrete-filled double steel tubes (CFDST) are a meaningful and effective advancement of CFSTs. CFDST facilitate slender architectural solutions for high load-levels and speedy construction processes. The assessment of the overall performance and seismic behavior of such global structures is primarily based on experiments, which are mainly carried out on small units and reduced systems respectively. The reduction of such a global system into small units for experimental testing automatically leads to individual effects not being considered in the evaluation of the overall performance. Systematic studies on the influence of the system reduction in an experimental study on the seismic behavior of global frame structures are missing so far. Therefore, the principal research issues of the SEeMOREEffect-project are as follows: (i) What effect has the system reduction of a complex frame structure in a test set-up and experimental procedure on the fundamental behavior of modern composite MRF-structures under seismic loads? (ii) Could these effects in the same extent be captured in a reliable model, to predict the seismic behavior of frame substructures? (iii) And is it possible to capture these effects via analytical approaches to include them in a surrogate model in order to analyze the seismic behavior of global frame structures? The SEeMOREEffect-project aims at answering the questions by a comprehensive work program with numerical and analytical-based packages and the focus on a targeted and rigorous test program on large-scale test specimens. With this, the SEeMOREEffect-project is the first systematic study utilizing the direct comparison of experimental results on composite substructure and subassemblies to analyze the effect of the degree of system reduction and thus the influence of the experimental technique on the assessment of the global seismic behavior.