Abstract

Extensive brittle failures in the weld zone of the beam bottom flange in composite joints of SMRFs were observed during the Northridge earthquake and the Kobe earthquake. One of the main reasons is the large tensile strain demand generated at the beam bottom flange zone under positive bending. The key to accurately understanding the mechanical properties of composite joints is the effective width of the slab. However, researchers have no consensus on the flange slab’s effective width for composite joints, even with the simplest solid concrete slab. Therefore, the best way to design the composite joint specimen is by following the current design specifications. However, each specification implements different ideas and approaches for specifying an effective slab width. This paper presents comparisons of the effective flange width provisions in China, the United States, Australia/New Zealand, and the European Union. The characteristics of each provision are briefly described and summarized. Numerical comparisons for positive and negative moment regions of continuous spans follow. Based on the commonalities and main differences among all these provisions, we propose a recommended equation for calculating the effective width of a solid concrete slab, reflecting the specification differences. The reliability of the recommended equation was verified with ABAQUS software analysis. The recommended equation can meet the fast and secure design requirements for composite joints in tests with concrete slabs.

Highlights

  • steel moment-resisting frames (SMRFs), there were a total of nine specimens used in the ABAQUS analysis by chan solid blue line in Figure 9 was extracted, and we adopted the beam free-end loading the beam length L or by changing the S0

  • The FE model of the cross-shaped composite joint shown in Figure 9 is data and the calculation results of Equations (7) and (8) are listed in Tables 4 and 5

  • The conclusion than 1.3 times the width of the column flange when subjected to reversed loading obtained from the cross-shaped composite joint is fully applicable to the T-shaped effective width was approximately equal to the column flange width

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Summary

Introduction

One of the reasons is the effect of the concrete slab, which causes the neutral axis to move toward the top flange when subjected to positive beam bending (concrete slab under compression) and the strain on the bottom flange to be much larger than that of the top flange. This strain concentration on the bottom flange may lead to premature failure of the connection. The shear connectors and slab strongly influence the mechanical properties of composite beam-to-column joints. Some authors [4,7,8,9,10,11] have studied the slab influence on composite joints

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