Simplified computational methodology for analysis and studies on behaviour of incrementally launched continuous bridges
Simplified computational methodology for analysis and studies on behaviour of incrementally launched continuous bridges
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DOI：
10.12989/sem.2004.17.2.245
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发表时间：
2004-02
影响因子：
2.2
通讯作者：
S. Sasmal;K. Ramanjaneyulu;V. Srinivas;S. Gopalakrishnan
中科院分区：
文献类型：
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作者：
S. Sasmal;K. Ramanjaneyulu;V. Srinivas;S. Gopalakrishnan
增量浇筑法是混凝土桥梁施工中最具竞争力的技术之一。它避免了昂贵和耗时的模板工作，并将所有施工活动集中在一个小的浇筑场，从而节省了传统桥梁施工的成本和时间。从质量的角度来看，它通过允许高重复性和工业环境消除了整体行为的不确定性。但是，从分析和设计的角度来看，增量下水的桥梁最具特点的方面是，它必须吸收与临时支撑相关的应力，这些应力在其启动过程中逐渐由甲板承担。因此，有必要对发射的每个步骤进行结构分析，这是一个繁琐而耗时的过程。支座沉降和温度变化的影响使问题更加复杂。采用传递矩阵法，可以用最小的计算量有效地处理这一问题。本文介绍了结构体系优化的分析方法、优化公式、施工过程中支座沉降和温度梯度对增量启动桥梁应力状态的影响。
Incremental launching method is one of the highly competitive techniques for construction of concrete bridges. It avoids costly and time consuming form work and centralizes all construction activities in a small casting yard, thus saving in cost and time against conventional bridge construction. From the quality point of view, it eliminates the uncertainty of monolithic behaviour by allowing high repetitiveness and industrial environment. But, from analysis and design point of view, the most characteristic aspect of incrementally launched bridges is that, it has to absorb the stresses associated with the temporary supports that are gradually taken on by the deck during its launch. So, it is necessary to analyse the structure for each step of launching which is a tedious and time consuming process. Effect of support settlements or temperature variation makes the problem more complex. By using transfer matrix method, this problem can be handled efficiently with minimal computational effort. This paper gives insight into method of analysis, formulation for optimization of the structural system, effect of support settlement and temperature gradient, during construction, on the stress state of incrementally launched bridges.