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A platform for research: civil engineering, architecture and urbanism
Seismic behavior investigation of TOB bolted endplate connection with novel internal strengthening structure
Abstract This paper presents the results of the cyclic loading test on Thread-fixed One-side Bolts bolted Endplate Connection (TOBEC). Two types of novel strengthening structures including double H-shape stiffener and polygonal steel tube stiffener were applied to the connection to increase the length of the threads and improve the bending strength of the Hollow Square Column (HSC). Six full-scale specimens in total were designed to study the effect of the thickness of the strengthening structure sidewall/flange, and the thickness of the endplate on connection seismic performance. The failure modes, bending moment-rotation relationship, and the seismic performance of each specimen were analyzed and evaluated. Test results revealed that the strengthening structures could significantly improve connection mechanical performance. Meanwhile, the unwanted failure mode of hole thread failure and the column wall yielding failure could be avoided by utilizing strengthening structures moderately. Moreover, limited experimental results indicated that the double H-shaped stiffener was more effective in increasing the bending strength of the column wall. The strengthened connection could display satisfactory seismic performance in terms of rotation capacity, strength degradation, stiffness degradation, and energy dissipation.
Graphical abstract Two types of novel strengthening structures including double H-shape stiffener and polygonal steel tube stiffener were applied to the Thread-fixed One-side Bolts bolted Endplate Connection (TOBEC) to increase the length of the hole thread and improve the bending strength of the Hollow Square Column (HSC). Six full-scale specimens in total were designed to study the effect of the type and the sidewall thickness of the strengthening structure, and the endplate thickness on connection seismic performance. The failure modes, bending moment-rotation relationship, and the seismic performance of each specimen was analyzed and evaluated. Test results revealed that the strengthening structures would play a significant role in preventing the anchored hole threads from premature failure and improving the outward resistance of the HSC wall. The unwanted failure mode of hole thread failure and the column wall yielding failure could be avoided by utilizing strengthening structures moderately. Based on the test results, specimens J-E20-P18 and J-E20-H18 could be classified as fully restrained connections, which could meet the design criteria of “strong column-weak beam”. It highlighted the applicability of this strengthened TOBEC with internal strengthening structures. Besides, all TOBECs with internal strengthening structure exhibited satisfactory seismic performance in terms of rotation capacity, strength degradation, stiffness degradation, and energy dissipation. Display Omitted
Highlights Two novel internal strengthening structures were proposed to strengthen the TOBs bolted Endplate Connection (TOBEC). Six TOBECs with strengthening structure were tested under cyclic loading. The seismic performance including the failure mode, hysteretic response, and ductility of this connection is discussed. The TOBEC with strengthening structure could meet the design criteria of “strong column - weak beam”.
Seismic behavior investigation of TOB bolted endplate connection with novel internal strengthening structure
Abstract This paper presents the results of the cyclic loading test on Thread-fixed One-side Bolts bolted Endplate Connection (TOBEC). Two types of novel strengthening structures including double H-shape stiffener and polygonal steel tube stiffener were applied to the connection to increase the length of the threads and improve the bending strength of the Hollow Square Column (HSC). Six full-scale specimens in total were designed to study the effect of the thickness of the strengthening structure sidewall/flange, and the thickness of the endplate on connection seismic performance. The failure modes, bending moment-rotation relationship, and the seismic performance of each specimen were analyzed and evaluated. Test results revealed that the strengthening structures could significantly improve connection mechanical performance. Meanwhile, the unwanted failure mode of hole thread failure and the column wall yielding failure could be avoided by utilizing strengthening structures moderately. Moreover, limited experimental results indicated that the double H-shaped stiffener was more effective in increasing the bending strength of the column wall. The strengthened connection could display satisfactory seismic performance in terms of rotation capacity, strength degradation, stiffness degradation, and energy dissipation.
Graphical abstract Two types of novel strengthening structures including double H-shape stiffener and polygonal steel tube stiffener were applied to the Thread-fixed One-side Bolts bolted Endplate Connection (TOBEC) to increase the length of the hole thread and improve the bending strength of the Hollow Square Column (HSC). Six full-scale specimens in total were designed to study the effect of the type and the sidewall thickness of the strengthening structure, and the endplate thickness on connection seismic performance. The failure modes, bending moment-rotation relationship, and the seismic performance of each specimen was analyzed and evaluated. Test results revealed that the strengthening structures would play a significant role in preventing the anchored hole threads from premature failure and improving the outward resistance of the HSC wall. The unwanted failure mode of hole thread failure and the column wall yielding failure could be avoided by utilizing strengthening structures moderately. Based on the test results, specimens J-E20-P18 and J-E20-H18 could be classified as fully restrained connections, which could meet the design criteria of “strong column-weak beam”. It highlighted the applicability of this strengthened TOBEC with internal strengthening structures. Besides, all TOBECs with internal strengthening structure exhibited satisfactory seismic performance in terms of rotation capacity, strength degradation, stiffness degradation, and energy dissipation. Display Omitted
Highlights Two novel internal strengthening structures were proposed to strengthen the TOBs bolted Endplate Connection (TOBEC). Six TOBECs with strengthening structure were tested under cyclic loading. The seismic performance including the failure mode, hysteretic response, and ductility of this connection is discussed. The TOBEC with strengthening structure could meet the design criteria of “strong column - weak beam”.
Seismic behavior investigation of TOB bolted endplate connection with novel internal strengthening structure
Liu, Yuanjian (author) / Zhang, Boxun (author) / Liu, Xinyu (author) / Cheng, Tianxi (author) / Zhu, Hao (author) / Wang, Peijun (author) / Liu, Fangzhou (author)
2022-01-08
Article (Journal)
Electronic Resource
English
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