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(東南大學(xué)混凝土及預(yù)應(yīng)力混凝土結(jié)構(gòu)教育部重點(diǎn)實(shí)驗(yàn)室，南京 210096)

［提要］研究了張弦梁結(jié)構(gòu)的承載可靠性能，采用響應(yīng)面方法重構(gòu)出結(jié)構(gòu)的極限狀態(tài)方程，用一次二階矩算法計(jì)算可靠指標(biāo)。分析了荷載比例、矢跨比、垂跨比和抗力類變量的變異系數(shù)對(duì)結(jié)構(gòu)可靠性能的影響。得出了矢跨比基于承載可靠性能的最優(yōu)值。為張弦梁結(jié)構(gòu)的設(shè)計(jì)提供了有益的建議。

［關(guān)鍵詞］張弦梁結(jié)構(gòu)；可靠度；荷載比例；矢跨比；垂跨比

Influences of Some Parameters on Reliability of  Beam String Structure/Jiang Youbao, Feng Jian,   Jiang Jianfeng, Meng Shaoping(Key Laboratory of RC/PC Structures of Ministry of Education, Southeast University, Nanjing 210096, China)

Abstract:Beam-string structures have been adopted in several large-span structures. The mechanical reliable performances of the structure are analyzed. The limit state equation is restructured with the response surface method (RSM), and  the reliability index is calculated with the first order reliability method (FORM). The influences of the load combination ratio, rise-span ratio, sag-span ratio and resistant variable variance on the reliable performance are discussed. The optimal rise-span ratio of the arch is obtained. These conclusions provide some useful suggestions to the design of beamstring structures.

Keywords:

beam string structure; reliability; load combination ratio; risespan ratio; sagspan ratio

*國(guó)家自然科學(xué)基金項(xiàng)目(50478075)；江蘇省自然科學(xué)基金項(xiàng)目(BK2003061)。