CAJ | 학술논문

采用数值模拟结合现场监测的方法研究了复杂风环境对跨江、跨海大桥大体积混凝土桥塔施工水化热的影响。首先，提出了风环境下混凝土水化热的理论计算方法，并基于实际背景工程考虑风环境，对大体积混凝土桥塔施工过程中的水化热效应进行数值模拟；然后，利用现场实际监测数据，对模拟的准确性进行验证；最后，利用此数值模型，针对风特征及结构参数进行分析。分析结果表明：环境平均风速增大会使混凝土桥塔节段内的水化热温度极值降低，但其表面温度梯度增加，开裂可能性也相应增大；结构尺寸的增大会削弱风环境对混凝土水化热的影响，但由尺寸增大引起的刚度增加会导致水化热最大主拉应力明显增大，从而引起混凝土开裂；同一风环境下，桥塔截面形式的改变对浇筑过程中结构内部温度梯度、极值分布以及主应力大小影响明显。
채용수치모의결합현장감측적방법연구료복잡풍배경대과강、과해대교대체적혼응토교탑시공수화열적영향。수선，제출료풍배경하혼응토수화열적이론계산방법，병기우실제배경공정고필풍배경，대대체적혼응토교탑시공과정중적수화열효응진행수치모의；연후，이용현장실제감측수거，대모의적준학성진행험증；최후，이용차수치모형，침대풍특정급결구삼수진행분석。분석결과표명：배경평균풍속증대회사혼응토교탑절단내적수화열온도겁치강저，단기표면온도제도증가，개렬가능성야상응증대；결구척촌적증대회삭약풍배경대혼응토수화열적영향，단유척촌증대인기적강도증가회도치수화열최대주랍응력명현증대，종이인기혼응토개렬；동일풍배경하，교탑절면형식적개변대요축과정중결구내부온도제도、겁치분포이급주응력대소영향명현。
The influence of complex wind environments on hydration heat of massive concrete pylon of bridges crossing over river or sea is investigated by using numerical simulation and on-site monito-ring.First,the theoretical calculation method of hydration heat of concrete in wind environments is proposed.With the consideration of wind environments,the hydration heat effects in the construc-tion of massive concrete pylon are simulated based on a practical project.Then,the accuracy of the proposed simulation is verified according to the monitoring data from the pre-installed sensors.Final-ly,the wind characters and structure parameters are parametrically analyzed by using the proposed simulation.The analysis results show that with the increase of the average wind speed,the limit val-ues of the hydration heat-induced temperatures inside the concrete pylon segments decrease,but the temperature gradient of the structure surface and the cracking possibility increase.The influence of wind environments is weakened with the increase of the size of the pylon cross-section.However, the increased structure stiffness caused by the increase of the size can increase the maximum principal tensile stress induced by hydration heat,which results in the concrete cracking.The temperature gra-dient,the distribution of the limit values of the temperatures,and the principal tensile stress during the construction are highly influenced by the variation of the shape of the pylon cross-section in the same wind environments.