The Structural Design of Tall and Special Buildings

Jiang, Binhui; Wang, Mengjie; Shen, Yongjiang; Li, Yaozhuang

doi: 10.1002/tal.1711pmid: N/A

Progressive collapse of a building structure under fire is a disaster that may cause heavy casualties and serious economic loss. However, there is a lack of codified method to assess fire‐induced progressive collapse of building structures. A global–local analysis method (GLAM) has recently been proposed by the authors and their colleagues to assess progressive collapse of steel buildings under localized fire, and its application on fire scenarios that causes one inner column to fail has been verified. This paper extends the application of GLAM to fire scenarios that causes a side column to fail in a planar steel frame. The predictions of the GLAM were validated against the results obtained from nonlinear dynamic analysis of the whole frame model. Besides, effects of location of the heated column at different storeys and load level of the frame were also studied. The results show that GLAM gives the same collapse predictions to the case studies with detailed nonlinear dynamic analysis. The differences between the critical load obtained from GLAM and that provided by the nonlinear dynamic analysis is within 7%. Therefore, GLAM has good applicability on robustness assessment of planar steel frames caused by failure of a side column under localized fire.

Luo, Jinhui; Zong, Shaohan; Zhu, Shaojun; Guo, Xiaonong; Yu, Mengtong

doi: 10.1002/tal.1712pmid: N/A

This paper investigates the mechanical behavior of Q690 high‐strength steel (HSS) beams at room and high temperatures by means of experimental and numerical analysis. First, simply supported and cantilever Q690 steel beams were tested under room and elevated temperatures. The test results indicated that the bearing capacity of the specimens in fire decreases sharply with the increase of temperature. Subsequently, finite element models were established and verified against the experimental results. Finally, a large amount of numerical analysis was carried out, and two formulae to estimate the bearing capacity of Q690 HSS beams under room and elevated temperatures were obtained. The results estimated by the formulae were compared with the test data and Eurocode 3, which proved that the proposed formulae are reliable enough for practical design.

Sui, Yan; He, Zhenhua; Xue, Jianyang; Wu, Zhanjing

doi: 10.1002/tal.1710pmid: N/A

This paper aims to research the seismic performance of steel beam‐column damping joint of Chinese traditional style building. Three specimens of steel beam‐column damping joints with the1:2.6 scale were designed and researched, which included two specimens with viscous damper and one contrast specimen without viscous damper. The experimental study was carried out by cyclic dynamic loading test. The effects of viscous dampers for the steel structure beam‐column joint in Chinese traditional style buildings are analyzed by investigating the hysteretic curves, skeleton curves, strength and stiffness degradation, ductility, overstrength factor, and energy dissipation capacity. The results show that the steel beam‐column joints of Chinese tradition style buildings with viscous damper have better energy dissipation capacity and higher bearing capacity. Based on the experiment, the nonlinear finite element analysis was conducted using the ABAQUS software. The influence of damping coefficient on the behavior of the new damping joint of Chinese tradition style buildings was obtained, and the design suggestions were presented.

Zhuang, Liang‐Dong; Nie, Xin; Xu, Li‐Yan

doi: 10.1002/tal.1713pmid: N/A

This paper presents a case study of the layout strategy for a multiple passive energy dissipation (MPED) system and its influence on the seismic behavior of highly irregular structures. The investigated structure is a single‐column elevated station in a cantilevered structure form, which is unique and characterized by uneven mass and stiffness distributions in both elevation and plane. To improve seismic resistances of the focused structure, the MPED system composed of multiple types of passive energy dissipation (PED) devices targeting different vulnerabilities is devised. In addition, a high‐fidelity and efficient numerical model is developed to assess the structural seismic performance, by leveraging the secondary development based on proprietary finite‐element analysis package MARC.MSC. The fiber beam–column elements are employed to simulate the composite members under complex loading conditions, and spring elements incorporated with cyclic hardening property are developed to simulate the PED devices. Nonlinear static and time history analysis are conducted for the key substructures and whole structure. The results demonstrate that the MPED system can effectively improve the stiffness, strength, and ductility of the structure and significantly reduce its global responses. A comprehensive evaluation indicates that the MPED system is beneficial for the members directly equipped with PED devices, but the benefits are limited for unprotected members that require special attentions in design to avoid secondary damage. Through this study, valid analysis tools and suggestions are provided for the design of high‐irregular structures with MPED system.

doi: 10.1002/tal.1638pmid: N/A

No abstract is available for this article.

Xiang, Sheng; Cheng, Bin; Zou, Le; Kookalani, Soheila

doi: 10.1002/tal.1698pmid: N/A

Glass fiber‐reinforced polymer (GFRP) elastic gridshell is composed of long continuous GFRP tubes and achieves its shape through the elastic deformations during the lifting construction process. However, the complicated mechanical behaviors during the practical forming process are rarely examined in the previous researches. In this research, an innovative approach consolidating the form‐finding analysis and the construction simulation is proposed for the GFRP elastic gridshells. The integrated approach, which is developed with the ABAQUS and Python, is based on finite element analysis and iterative optimization; therefore, the mechanical deformations of gridshell can be accurately taken into account. The procedure of the integrated analysis is comprehensively presented by taking a typical double‐hump gridshell as an example. The form‐finding results (i.e., the flat lattices) derived from the iteration are found to be insensitive to the initial input. The structural behavior indexes (e.g., deflections, support reactions, and sectional stresses) during the lifting construction process are also available in the analysis. Based on the indexes, some general structural features of such gridshells are concluded. The achievements provide novel perspectives for the form‐finding analysis of GFRP elastic gridshells where lifting construction is involved, which is beneficial for the design and analysis of such structures.