Xo Li. Calculate the structure with a new type of unit-virtual laminated beam element. The goal is to minimize the maximum stress of the beam and the tower. Use the quasi-Newton method to optimize the cable force. Use this method to an actual cable-stayed bridge. The cable force was optimized and a set of cable forces were obtained. Under this cable force, the structural stress is in good condition and the top of the tower is small. This method is simple and effective.
The virtual laminated beam element is the basic assumption that the beam is introduced on the basis of the 4 to 8-node plane isoparametric element [6,7]; when the element stiffness matrix is ​​calculated, the block-integration is used so that the material in one element can have more The shape of the cross section can be arbitrary, ie "virtual" or "laminated". This unit is suitable for straight beams and curved beams. It is easy to handle variable cross-section conditions and can accurately consider the actual boundary conditions. The beam element also uses its own weight as its volume. The load, which is more in line with the actual situation.
The most important feature of a virtual laminated beam element is the calculation of the element stiffness matrix. Since the material in the element and the thickness of the beams are not the same, the integral domain on the element needs to be discretized and divided into blocks. Those without material A block is a virtual block. The processing of a virtual block is very convenient. Only the integral value on the block can be set to zero.
Steel cables have been used more and more widely in various civil infrastructures and large building structures. Cables are the main bearing components of these structures. The structural linearity, distribution of internal forces, loads, cable decay, failure, and overall structural safety are all concentrated on the cable's stress. In order to facilitate the understanding of the cable itself and the structural safety and operational status, timely detection of accident precursors, and prevention of sudden accidents, long-term online monitoring of the cable cable force must be performed. At present, there are three commonly used methods for measuring the cable force at home and abroad, pressure gauge measurement, pressure sensor measurement and frequency measurement. The first two methods are applicable to the determination of the cable tension of the tension cable that is being tensioned, and the cable tension of the tension cable that has been tensioned is retested. Therefore, when it is necessary to perform the cable tension on the completed cable stayed cable, In monitoring, almost all frequency methods are used, but frequency testing errors are expensive and expensive. The sensor cable force measurement method has been used at home and abroad for some bridges due to its long service life, low cost, relatively easy replacement, and almost no impact on the cable.
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