CAJ | 학술논문

为提高大跨度悬索桥基准索股的施工精度,基于悬链线理论提出2种调索方法.一是根据控制点的里程和标高,计算调整基准索股的总无应力长度及对应主塔偏位和施上温度的跨中点理论标高,然后将该跨索股的理论无应力长度转换成该跨调整端索鞍处的有应力长度,即索长调整量的精确解,该方法由于考虑主塔偏位、基准索股的实际跨径和温度等的影响,计算精度高.二是基于悬链线线形方程推导出的中、边跨悬链线简化调索公式.将上述2种方法及传统的抛物线调索公式法应用于珠江黄埔大桥的基准索股的调索计算中,结果表明:对于中跨,悬链线简化调索公式的计算精度高于传统的抛物线调索公式,两者相差约3%;对于边跨,两者精度相差不大;两者相对于索长调整量精确计算法的误差均不超过5%,均可应用于实桥的调索分析.应用本文提出的2种方法进行珠江黄埔大桥基准索股的施工监控,最终取得了理想线形,验证了这2种方法的正确性.
위제고대과도현색교기준색고적시공정도,기우현련선이론제출2충조색방법.일시근거공제점적리정화표고,계산조정기준색고적총무응력장도급대응주탑편위화시상온도적과중점이론표고,연후장해과색고적이론무응력장도전환성해과조정단색안처적유응력장도,즉색장조정량적정학해,해방법유우고필주탑편위、기준색고적실제과경화온도등적영향,계산정도고.이시기우현련선선형방정추도출적중、변과현련선간화조색공식.장상술2충방법급전통적포물선조색공식법응용우주강황포대교적기준색고적조색계산중,결과표명:대우중과,현련선간화조색공식적계산정도고우전통적포물선조색공식,량자상차약3%;대우변과,량자정도상차불대;량자상대우색장조정량정학계산법적오차균불초과5%,균가응용우실교적조색분석.응용본문제출적2충방법진행주강황포대교기준색고적시공감공,최종취득료이상선형,험증료저2충방법적정학성.
Two methods for strand adjustment were proposed based on the catenary theory to improve the construction accuracy of the datum strand of long-span suspension bridge. One method was a precise meth-od to calculate the adjustment length. With this method, when the mileage and height of the control point were measured, the total unstressed length of the datum strand in the adjustment span, and the theoretical elevation of the midspan corresponding to the deviation of the main tower under the construction tempera-ture were calculated. Then, the theoretical unstressed length of the cable strand in the span was converted into the stressed length of the cable saddle at the adjustment end of the span, which was the exact solution of cable length adjustment. This method features with high calculation accuracy because it takes the influ-ence of such factors into account as the deviation of the main tower, the practical span of the datum strand and the temperature variations. The other method was to deduce the simplified catenary cable adjustment formulas based on the catenary linetype equation. The two methods were used in the datum strand adjust-ment calculation of Huangpu Bridge over Zhujiang River, with the traditional parabola adjustment formu-las. The result shows that, for mid span, the simplified catenary adjustment formulas present a higher ac-curacy than the conventional parabola formulas, with a 3% relative difference. For side span, the two lead to almost the same precision. The errors of the two kinds of adjustment formulas are less than 5%, com-paring with the precise method for calculating the cable length adjustment. So, both can be used in strand adjustment analysis of actual bridge construction. The two methods presented above were used in the da-tum strand construction monitoring of Huangpu Bridge over Zhujiang River. Ideal linetype of the monito-ring data is obtained, which validates the correctness of the two methods.