陡坡双桩柱式桥墩沉降分析

Study on Settlements of Double Pile-column Bridge Pier at Steep Slope

针对山区陡坡桥墩的复杂受力特点,根据某陡坡双桩柱式桥墩的工程实际情况,利用ADINA有限元分析程序的模拟结果,分析了墩顶竖向荷载、坡顶荷载、桩径、桩柱混凝土强度等级、桩周(岩)土的弹性模量、桩间距等对双桩柱桥墩沉降的影响。结果表明:在竖向荷载作用下,前桩墩顶的沉降比后桩墩顶的大,且随着荷载的增加其差值也越来越大;但是在坡顶荷载作用下,前、后墩顶的沉降变化规律则相反;不论是在墩顶竖向荷载作用下,还是在坡顶荷载单独作用下,前桩柱墩顶的沉降增量总比后桩柱墩顶的要大。在一定的墩顶竖向荷载作用下,随着墩周(岩)土的弹性模量、桩径、桩柱混凝土强度等级的增加,双桩柱墩顶的沉降量都减少,且其减幅基本相同。

Aiming at the complex loading characters of bridge pile at steep slope in mountians, according to a double pile-column bridge piers engineering at steep slope , finite elememt analysis of settlements of double pile-column bridge piers were carried out under different factors, such as vertical loading, slope top loading, pile diameter, strenth grade of pile-column concrete, elastic modulus of soil or rock around pile , which used software ADINA. The numerical simulation results show that settlements of front pile pier top and back pile pier top are higher than those of back pile pier top under vertical loading, and its difference is inceased with increasing of loadings, while these lows are converse under slope top loading. The increment of settlements of front pier top always are higher than those of back pier top under vertical loading or slope top loading. The settlements of double pile-column bridge piers are reduced with increasing of pile diameter, strenth grade of pile-column concrete,elastic modulus of soil or rock around pile under a certain vertical loading, and those reduction are approximately same.