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扶長生， 張小勇， 鞠 進(jìn)， 周立浪
（上海長福工程結(jié)構(gòu)設(shè)計(jì)事務(wù)所，上海200011）[摘要] 性能設(shè)計(jì)不僅是提高結(jié)構(gòu)的安全度，更應(yīng)該是針對地震的偶發(fā)性和震害對社會(huì)及經(jīng)濟(jì)的危害以及小震、中震、大震重現(xiàn)周期和作用效應(yīng)的巨大差別，預(yù)先選取在不同水準(zhǔn)地震作用下結(jié)構(gòu)的抗震性能目標(biāo)，按期望的目標(biāo)值，確定相應(yīng)的延性和構(gòu)造措施。通過靜力或動(dòng)力非線性分析，掌握結(jié)構(gòu)和構(gòu)件及節(jié)點(diǎn)在大震作用下的全過程反應(yīng)，判別彈塑性層間位移角是否超過規(guī)定的限值，構(gòu)件和節(jié)點(diǎn)是否具有足夠的延性等等，實(shí)現(xiàn)一系列預(yù)期的性能目標(biāo)。文中推薦美國ASCE41-06構(gòu)件塑性變形的可接受準(zhǔn)則，提出了高層建筑的基本安全性能目標(biāo)為中震作用下的梁端、大震作用下的剪力墻底部加強(qiáng)區(qū)應(yīng)出現(xiàn)彎曲塑性鉸，目標(biāo)值LS，以耗散大部分的地震能量，降低底部剪力。使用PERFORM-3D，通過工程實(shí)例，詳細(xì)解釋了上述性能目標(biāo)的實(shí)現(xiàn)過程。
[關(guān)鍵詞] 性能設(shè)計(jì)；抗震性能目標(biāo)；PERFORM-3D
中圖分類號：TU398.7 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2011) Sl-0001-08Selection of objective for tall buildings and performance-based design by PERFORM-3D
Fu Changsheng, Zhang Xiaoyong, Ju Jin, Zhou Lilang
( Shanghai ClunaFu Structural Design Inc., Shanghai 200011, China)Abstract: For performance-based design of tall buildings, it should not be only for enhancing the safety objective of the buildings, but the selection of an acceptable target building performance levelin accordance with earthquake hazard level. Depending on the selected building objective, the ductility is required for components such as beam, column and wall. The response of the building is analyzed by the static or dynanuc non-linear analysis procedures to achieve the selected target building performance level. As basic safety objective, it may be reasonable for the tall buildings to yield at the ends of beams and to select Life Safety level at the BSE-1 earthquake hazard level, Collapse Prevention level at the BSE-2 earthquake level. For the base end of walls, the target performance level of Immediate Occupancy may be selected for the BSE-1 efuthquake hazard level, Life Safety level for the BSE-2 earthquake hazard level. In doing so, most of the energy of seisnuc wave would be dissipated by rotation of the plastic hinges at the ends of the beams. The base shear would be reduced as the degradation of stiffness of the structure during earthquake. As an example, one engineering project is illustrated, which is analyzed by using PERFORM-3D.
Keywords: performance-based design; target building performance level; PERFORM-3D
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