水利水电科技进展
水利水電科技進展
수이수전과기진전
ADVANCES IN SCIENCE AND TECHNOLOGY OF WATER RESOURCES
2014年
3期
65-69
,共5页
钢筋混凝土%上闸首结构%升船机%配筋方案%裂缝宽度%裂缝长度%有限元分析
鋼觔混凝土%上閘首結構%升船機%配觔方案%裂縫寬度%裂縫長度%有限元分析
강근혼응토%상갑수결구%승선궤%배근방안%렬봉관도%렬봉장도%유한원분석
reinforced concrete%the upper lock head structure%ship lift%reinforcement schemes%crack width%crack depth%finite element analysis
针对既要控制裂缝宽度又要控制裂缝长度的碾压与常态混凝土组成的某升船机上闸首整体坞式结构，通过对比不同配筋方案的钢筋混凝土非线性有限元计算结果，提出以材料强度标准值所得裂缝长度和宽度进行底板裂缝控制从而确定底板常态混凝土最小厚度，以材料强度平均值所得裂缝长度确定钢筋布置范围的计算原则；同时给出了符合限裂设计要求的底板常态混凝土最小厚度和配筋方案，并探讨了缝面水压的不同施加方式对裂缝的影响。计算结果表明，当缝面水压按全水头分布施加时，若裂缝长度超过钢筋布置范围，则裂缝会不断扩展，引起结构失效；缝面水压按渗透压力分布和三角形分布施加时，裂缝扩展能够收敛，且前者所得的裂缝宽度和长度均大于后者。
針對既要控製裂縫寬度又要控製裂縫長度的碾壓與常態混凝土組成的某升船機上閘首整體塢式結構，通過對比不同配觔方案的鋼觔混凝土非線性有限元計算結果，提齣以材料彊度標準值所得裂縫長度和寬度進行底闆裂縫控製從而確定底闆常態混凝土最小厚度，以材料彊度平均值所得裂縫長度確定鋼觔佈置範圍的計算原則；同時給齣瞭符閤限裂設計要求的底闆常態混凝土最小厚度和配觔方案，併探討瞭縫麵水壓的不同施加方式對裂縫的影響。計算結果錶明，噹縫麵水壓按全水頭分佈施加時，若裂縫長度超過鋼觔佈置範圍，則裂縫會不斷擴展，引起結構失效；縫麵水壓按滲透壓力分佈和三角形分佈施加時，裂縫擴展能夠收斂，且前者所得的裂縫寬度和長度均大于後者。
침대기요공제렬봉관도우요공제렬봉장도적년압여상태혼응토조성적모승선궤상갑수정체오식결구，통과대비불동배근방안적강근혼응토비선성유한원계산결과，제출이재료강도표준치소득렬봉장도화관도진행저판렬봉공제종이학정저판상태혼응토최소후도，이재료강도평균치소득렬봉장도학정강근포치범위적계산원칙；동시급출료부합한렬설계요구적저판상태혼응토최소후도화배근방안，병탐토료봉면수압적불동시가방식대렬봉적영향。계산결과표명，당봉면수압안전수두분포시가시，약렬봉장도초과강근포치범위，칙렬봉회불단확전，인기결구실효；봉면수압안삼투압력분포화삼각형분포시가시，렬봉확전능구수렴，차전자소득적렬봉관도화장도균대우후자。
It is necessary to control crack width and crack length for the upper lock head of a ship lift, which is generally a dock-type structure made of roller compacted concrete ( RCC) and normal concrete. Based on the comparison of the nonlinear finite element calculation results of reinforced concrete with different structural reinforcement schemes, a calculation principle was proposed. According to this principle, concrete standard strength is used to control crack width and crack length in the bottom slab and to determine the minimum thickness of normal concrete of the bottom slab. The crack length, determined by average strength of concrete, is used to determine the scope of reinforcement. The minimum thickness and the structural reinforcement scheme of normal concrete bottom slab were suggested. The influence of applying ways of water pressure on the crack surface on cracks was analyzed. The results showed that when the water pressure on the crack surface was full water head, the cracks expanded until it exceeded the reinforcement scope, which caused structural failure. When the water pressure was seepage pressure and it was applied in a triangular distribution, the cracks was steady;both crack width and crack length obtained in the scenario with full water head are larger than that in the scenario with seepage pressure.
