水利与建筑工程学报
水利與建築工程學報
수리여건축공정학보
TECHNIQUE OF SEEPAGE CONTROL
2014年
3期
85-89
,共5页
肋板式主梁%施工控制%剪力滞效应%应力控制%线形控制
肋闆式主樑%施工控製%剪力滯效應%應力控製%線形控製
륵판식주량%시공공제%전력체효응%응력공제%선형공제
rib-slab beam%construction control%shear lag effect%stress control%alignment control
在预应力混凝土斜拉桥的施工控制中，应考虑剪力滞效应，对主梁的应力进行监测，使理论应力与实测应力更加吻合，准确判断主梁的安全状态。基于能量变分法导出每节点两剪力滞自由度的有限梁段法理论，并在某斜拉桥的施工控制中予以应用。结果表明：主梁截面既有正剪力滞效应，也有负剪力滞效应，且随着主梁内轴压力的增大，有从负剪力滞效应向正剪力滞效应变化的趋势；主梁的弯曲剪力滞系数在施工过程中变化幅度较大。在大跨度预应力混凝土桥梁的施工监控中开展剪力滞效应研究，不但突破了剪力滞理论仅应用于桥梁设计的局限性，并完善补充了桥梁施工监控的理论。
在預應力混凝土斜拉橋的施工控製中，應攷慮剪力滯效應，對主樑的應力進行鑑測，使理論應力與實測應力更加吻閤，準確判斷主樑的安全狀態。基于能量變分法導齣每節點兩剪力滯自由度的有限樑段法理論，併在某斜拉橋的施工控製中予以應用。結果錶明：主樑截麵既有正剪力滯效應，也有負剪力滯效應，且隨著主樑內軸壓力的增大，有從負剪力滯效應嚮正剪力滯效應變化的趨勢；主樑的彎麯剪力滯繫數在施工過程中變化幅度較大。在大跨度預應力混凝土橋樑的施工鑑控中開展剪力滯效應研究，不但突破瞭剪力滯理論僅應用于橋樑設計的跼限性，併完善補充瞭橋樑施工鑑控的理論。
재예응력혼응토사랍교적시공공제중，응고필전력체효응，대주량적응력진행감측，사이론응력여실측응력경가문합，준학판단주량적안전상태。기우능량변분법도출매절점량전력체자유도적유한량단법이론，병재모사랍교적시공공제중여이응용。결과표명：주량절면기유정전력체효응，야유부전력체효응，차수착주량내축압력적증대，유종부전력체효응향정전력체효응변화적추세；주량적만곡전력체계수재시공과정중변화폭도교대。재대과도예응력혼응토교량적시공감공중개전전력체효응연구，불단돌파료전력체이론부응용우교량설계적국한성，병완선보충료교량시공감공적이론。
During the construction control of pre-stressed concrete cable-stayed bridge ,the theoretical stress of the main girder will accord with the measured stress by considering shear lag effect .On the bases of the energy variation method , the finite segment method theory with two shear-lag degrees of freedom was applied during the construction control of the cable-stayed bridge .The results showed that the main girder’s cross section had both positive and negative shear lag ef-fect ,and with the increase of axial pressure in the main girder ,the negative shear lag effect would transform to the posi-tive shear lag effect .The bending shear lag coefficient of the main girder had significant change in the construction pro -cess .The research of shear lag effect not only breaks through the limitation for bridge design ,but also improves and sup-plements the theory of the construction control for long-span pre-stressed concrete bridge .
