Abstract
Mega composite structural system presents wide application prospects in high-rise and super high-rise buildings. However, research concerning the important issues of the seismic behavior, collapse mechanism, and prevention from progressive collapse for such new structural systems under severe earthquakes is quite limited. This paper will summarize the current research status, followed by the discussions on the collapse and prevention mechanisms of high-rise and super high-rise mega composite structural systems under severe earthquakes, the theoretical basis on progressive collapse mechanisms, numerical simulation techniques, and test methods. The failure modes of high-rise mega composite structures were studied firstly, followed by the collapse mechanisms and the associated criteria and indices. In addition, a new numerical technique for simulating the non-linear structural collapses considering large deformations will be presented, along with the relevant test results. This study shows that analysis method, damage accumulation model, failure criteria, appropriate preventive measures, and improved collapse experimental verification methods are all important seismic design considerations for high-rise and super high-rise mega composite structures. Based on the study results, recommendations for collapse and prevention mechanisms of high-rise buildings are proposed.
Highlights
The concept of mega structures started in the late 1960s
According to the load capacity, mage structures can be divided into four basic types: mega trusses including tube structures, mega frame structures, mega suspended structures, and mega separating tube structures
Since 1960s’, researches on progressive collapse were largely carried out during three particular time periods with each period accompanied by a major collapse event [3]: 1968 collapse of Ronan Point apartment in London because of natural gas explosion causing a great concern to progressive collapses for the first time [4]; 1995 collapse of Alfred P
Summary
The concept of mega structures started in the late 1960s. This structural system consists of large members such as mega columns and mega beams which are different from the conventional ones. Progressive collapse means that after initial damage is caused by unconventional loads (e.g., strong earthquakes, impact, explosion, fire, et al.) triggering a local failure, other parts of the structure are partially destroyed due to the internal force redistribution [2]. Such chain reaction eventually leads to the collapse of large-scale or overall structure which is disproportionate with the initial local failure. Researches on the anti-collapse mechanism of and the prevention methods for the progressive collapse for important buildings have drawn increasing attention. 179(587ft) 65.1(214ft) 467.9(1535ft) 256(840ft) 150.15(493ft) 140.5(461ft) 288(945ft)
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